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AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 1 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 typical application AAT3698-x vin on/off bat iset in inchr c 2 1f c 1 1f ic ldoout ldoout abi abo term nobat battery pack gnd r 3 r 4 5v r 1 r 2 stat pok en c 4 1f c 3 1f 10.9mm 11.5mm u1 AAT3698-x c1 grm31mr71h105ka88 c2, c3 grm188r61a225ke34 c4 grm21br71c105ka01l r1 1.5k, 5%, 1/4w, 0603 r2 1.5k, 5%, 1/4w, 0603 r3 13.3k, 1%, 1/4w, 0603 r4 1.58k, 1%, 1/4w, 0603 general description the AAT3698-1/-2 batterymanager? is a single-cell lithi- um-ion (li-ion)/li-polymer battery charger ic designed to operate from a usb port or ac adapter with an input voltage of up to 7.0v. for increased safety, the AAT3698- 1/-2 also includes over-voltage input protection (ovp) up to 28v. the AAT3698-1/-2 precisely regulates battery voltage for 4.2v li-ion/polymer battery cells through a low r ds(on) switch. the charging current can be set by an external resistor up to 1.6a. if an over-voltage condition occurs from the input, the series switch quickly opens and a fault flag is activated, preventing damage to the battery and the charging circuitry. other fault conditions are monitored in real time. in case of an over-current, battery over-voltage, short circuit, or over-temperature failure, the device will automatically shut down, thus protecting the charging device, control system, and the battery under charge. a status monitor- ing output pin (stat) is provided to indicate charging activity. this open drain output pin can be used to drive an external led as a charging indicator. the AAT3698-1/-2 also includes a 5.0v ldo linear regu- lator with over-voltage protection that can supply loads of up to 50ma. the AAT3698-1/-2 is available in the pb-free, thermally enhanced, space-saving 3x3mm tdfn33-14 package and is rated over the -40c to +85c temperature range. features ? usb or ac adapter system power charger ? 3.0v ~ 7.0v input voltage range ? fast over-voltage protection turn off ? ovp trip threshold: 7.25v (typ) ? high level of integration with internal: ? power device ? reverse current blocking ? current sensing ? 5v/50ma ldo output ? programmable fast charge current from 50ma to 1.6a ? programmable charge termination current ? charge status indicator ? power ok indicator ? battery absence detection input pin ? automatic termination and recharge sequencing (AAT3698-1 only) ? automatic trickle charge for battery pre-conditioning ? emergency thermal shutdown protection ? digitally controlled thermal loop regulation ? active low enable with internal 200k pull-down resistor ? output for auto-booting ? 14-pin 3x3mm tdfn package applications ? bluetooth? headsets, headphones, accessories ? digital still cameras ? mobile telephones ? personal data assistants (pdas) ? mp3 players ? other lithium-ion/polymer battery-powered devices
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 2 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 pin description pin # name type function 1 inchr i/o ovp output switch and battery charger input; decouple to gnd with 1 f capacitor. 2 in i input from usb port or adapter connector. 3 ldoout o 5v/50ma ldo output through ovp device; bypass to gnd with 1 f capacitor. 4 pok o power ok ag pin; open drain, active low. 5 stat o charge status indicator pin; open drain, active low. 6 abo o auto booting output. 7 term i connect the r term resistor between the term pin and ground to set the charge termination current. when the term pin is connected to inchr, charge current termination level is set to 10% of the programmed fast charge current. 8 gnd i power ground. 9 en i enable pin, active low. internally connected to ground through a 200k pull-down resistor. 10 iset i connect r set resistor to this pin to set charging current. connect a 10k resistor from this pin to the system to monitor this pin's voltage. 11 ic i internally connected; connect this pin to ground. 12 nobat i no battery detection input. if the nobat pin is left unconnected, charging is disabled. inter- nally pulled to ldoout pin through a 1.6m pull-up resistor. 13 abi i auto booting input. internally connected to ground through a 200k pull-down resistor. 14 bat o connect to li-ion battery. ep exposed paddle; connect to ground. pin configuration tdfn33-14 (top view) inchr in ldoout 1 pok stat abo bat abi nobat ic iset en 2 3 4 5 6 term 7 12 11 14 13 10 9 gnd 8
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 3 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at co nditions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time. 2. mounted on an fr4 board. absolute maximum ratings 1 symbol description value units v in in continuous -0.3 to 30 v v p inchr, en, statb, pok, abi, nobat -0.3 to 7.5 v v n bat, iset, term, lodout, abo, ic -0.3 to v inchr + 0.3 v t j junction temperature range -40 to 150 c t a operating temperature range -40 to 85 c t lead maximum soldering temperature (at leads) 300 c thermal information 2 symbol description value units ? ja maximum thermal resistance (tdfn33-14) 50 ? c/w p d maximum power dissipation 2 w
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 4 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 1. the AAT3698-1/-2 is guaranteed to meet performance specifications over the -40 to +85c operating temperature range and is a ssured by design, characterization and cor- relation with statistical process controls. 2. when no battery is connected, the bat pin output voltage is regulated at 4.2v. 3. internal termination function is selected when v trem > v extrem_dis . 4. external termination function is selected when v trem < v extrem_en . electrical characteristics 1 v in = 5v, r set = 3.16k , v enb = v nobat = 0v, c in = 1 f, c inchr = 1 f, c bat = 1 f, c ldoout = 1 f, term = abi = ic = open, t a = -40 to +85c, unless otherwise noted. typical values are at t a = 25c. symbol description conditions min typ max units operation v in_max input over-voltage protection range 28 v v in normal operating input voltage range 3.0 7.0 v i op operating current v bat = 4.3v, r set = 15.8k 300 450 a i sd charge function shutdown supply current v enb = 5v, v bat = 4.3v 190 250 a i bat_leak leakage current from bat pin v bat = 4v, in pin open 2 5 a over-voltage protection v ovp over-voltage protection trip voltage v in rising edge 7.05 7.25 7.45 v v ovp_hys hysteresis 200 mv v in_bat_os v in ? v bat offset voltage v in rising, v bat = 4v 300 mv v in falling, v bat = 4v 200 v inchr_do drop out voltage between in and inchr pins v in = 5v, i bat = 500ma, r set = 1.58k 200 mv battery charger v uvlo under-voltage lockout threshold v in rising edge 2.6 2.8 3.0 v v uvlo_hys hysteresis 200 mv v chg_do drop out voltage between inchr and bat pins v in = 4.2v, i bat = 500ma, r set = 1.58k 100 mv v bovp battery over-voltage protection threshold 4.4 v bat pin voltage regulation v co(reg) constant regulated output voltage 2 r iset = 31.6k , i bat = 10ma 4.20 v ? v co /v co constant output voltage tolerance r iset = 31.6k , i bat = 10ma, t a = 25c -0.5 +0.5 % r iset = 31.6k , i bat = 10ma, t a = -40 to +85c -1 +1 v rch battery recharge voltage threshold (AAT3698-1 only) v bat falling v co(reg) - 0.1 v min preconditioning voltage threshold v bat rising 2.4 2.6 2.8 v current regulation i cc_range charge current programmable range 100 1600 ma i ch_cc constant-current mode charge current r set = 15.8k , v bat = 3.6v -15% 100 +15% ma r set = 3.16k , v bat = 3.6v -10% 500 +10% r set = 1.58k , v bat = 3.6v -10% 1000 +10% v iset iset pin voltage v bat = 3.6v t a = 25c 1.97 2 2.03 v t a = -40 to +85c 1.9 2 2.1 v i ch_trk% trickle charge current ratio r set = 3.16k , v bat = 2.0v 5 10 20 % of i ch_cc k iset charge current set factor: i ch_cc /i iset r set = 15.8k , v bat = 3.6v 790 r set = 3.16k , v bat = 3.6v 790 v term term pin voltage range from off to full charge 0 2.0 v v exterm_dis external termination disable threshold 3 v in = 5v, measured on term pin 4.8 v v exterm_en external termination enable threshold 4 v in = 5v, measured on term pin 3.5 v i term term pin output current v term = 0.2v -10% 15 +10% a i ch_term% charge termination threshold current ratio v term = 0.2v or tied to inchr pin 5 10 20 % of i ch_cc
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 5 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 1. the AAT3698-1/-2 is guaranteed to meet performance specifications over the -40 to +85c operating temperature range and is a ssured by design, characterization and cor- relation with statistical process controls. electrical characteristics (continued) 1 v in = 5v, r set = 3.16k , v enb = v nobat = 0v, c in = 1 f, c inchr = 1 f, c bat = 1 f, c ldoout = 1 f, term = abi = ic = open, t a = -40 to +85c, unless otherwise noted. typical values are at t a = 25c. symbol description conditions min typ max units logic control / battery protection v en(h) input high threshold 1.2 v v en(l) input low threshold 0.4 v r en input pull down resistor 200 k ? v nobat(h) input high threshold 1.2 v v nobat(l) input low threshold 0.4 v r nobat input pull up resistor 1600 k ? v abi(h) input high threshold v in = 0v, v bat = 4.2v 1.2 v v abi(l) input low threshold v in = 0v, v bat = 4.2v 0.4 v r abi input pull down resistor 200 k ? v abo(h) output high voltage v bat = 4.2v, i abo = -5ma (sourcing) v bat ? 1v v v abo(l) output low voltage v bat = 4.2v, i abo = 5ma (sinking) 0.4 v v stat output low voltage 0.4 v i stat_off stat pin leakage current v stat = 5.5v, v en = 5v 1 a v pok output low voltage i pok = 5ma 0.4 v i pok_off pok pin leakage current v pok = 5.5v, v in = 7v 1 a t ovpres over-voltage response time v in voltage step up from 6v to 8v, r load = 100 , c inchr = 1 f 0.1 s t ovpon ovp switch ovp release turn-on delay time v in voltage step down from 8v to 6v, r load = 100 , c inchr = 1 f 60 s t dly_pok pok off delay time from over- voltage v in voltage step up from 6v to 8v, r load = 100 , c inchr = 1 f 0.1 s t redly_pok pok on delay time from over- voltage v in voltage step down from 8v to 6v, r load = 100 , c inchr = 1 f 1.5 s t ovpstarton ovp switch startup turn-on delay time v in voltage step up from 0v to 5v, r load = 100 , c inchr = 1 f 220 s thermal protection th reg thermal loop regulation 110 oc th shdn chip thermal shutdown temperature threshold 140 oc hysteresis 15 5v ldo v ldoout ldoout voltage tolerance v in = 5.5v, i ldoout = 0ma to 30ma t a = 25c 4.9 5.0 5.1 v t a = -40 to +85c 4.75 5.0 5.25 v do dropout voltage from in i out = 30ma, v in = 5.0v 160 300 mv i out_lim ldo output current limit v in = 5.5v, v ldoout = 4.5v 55 90 125 ma v ldoout_lr line regulation v in = 5.4v to 6.4v, i ldoout = 30ma 10 mv v ldoout_dm lr dynamic line regulation i out = 30ma, v in = 5.4v to 6.4v, t r /t f = 2 s 200 mv v ldoout_dm ld dynamic load regulation i out = 1ma to 30ma, t r = <5 s, v in = 5.5v 60 mv
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 6 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 typical characteristics ? battery charger constant charging current vs. r set resistor values r set (k ) constant charging current (ma) 1 10 100 1000 10000 110 0.1 100 operating current vs. r set resistor values r set (k ) operating current (ma) 110 0.1 100 0 300 600 900 1200 1500 1800 2100 2400 preconditioning mode constant current mode battery charging current vs. temperature (r set = 1.58k; i ch_cc = 1000ma) temperature (c) battery charge current (ma) -15 10 -40 35 60 85 900 920 940 960 980 1000 1020 1040 1060 1080 1100 battery charging current vs. temperature (r set = 3.16k; i ch_cc = 500ma) temperature (c) battery charge current (ma) -15 10 -40 35 60 85 450 460 470 480 490 500 510 520 530 540 550 battery charging current vs. input voltage (r set = 1.58k) input voltage (v) battery charging current (ma) 4.3 4.6 4.0 4.9 5.2 5.5 5.8 6.1 6.4 6.7 7.0 700 750 800 850 900 950 1000 1050 v bat = 3.3v v bat = 3.6v v bat = 3.9v v bat = 4.1v battery charging current vs. input voltage (r set = 3.16k) input voltage (v) battery charging current (ma) 4.3 4.6 4.0 4.9 5.2 5.5 5.8 6.1 6.4 6.7 7.0 400 420 440 460 480 500 520 540 560 v bat = 3.3v v bat = 3.6v v bat = 3.9v v bat = 4.1v
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 7 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 typical characteristics ? battery charger battery charging current vs. battery voltage battery voltage (v) battery charging current (ma) 2.5 2.8 2.2 3.1 3.4 3.7 4.0 4.3 0 200 400 600 800 1000 1200 r set = 1.5k r set = 1.96k r set = 2.61k r set = 3.16k r set = 7.87k shutdown current vs. input voltage input voltage (v) shutdown current (a) 5.5 6.0 5.0 6.5 7.0 100 140 180 220 260 300 85c 25c -40c preconditioning charge current vs. temperature (r set = 1.58k; i ch_cc = 1000ma) temperature (c) preconditioning charge current (ma) -15 10 -40 35 60 85 90 94 98 102 106 110 preconditioning charge current vs. temperature (r set = 3.16k; i ch_cc = 500ma) temperature (c) preconditioning charge current (ma) -15 10 -40 35 60 85 45 46 47 48 49 50 51 52 53 54 55 constant output voltage vs. temperature (r set = 1.58k; i ch_cc = 1000ma) temperature (c) constant output voltage (v) -15 10 -40 35 60 85 4.10 4.13 4.16 4.19 4.22 4.25 4.28 4.31 constant output voltage vs. temperature (r set = 3.16k; i ch_cc = 500ma) temperature (c) constant output voltage (v) -15 10 -40 35 60 85 4.10 4.13 4.16 4.19 4.22 4.25 4.28 4.31
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 8 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 typical characteristics ? battery charger enable low voltage vs. input voltage input voltage (v) enable low voltage (v) 5.4 5.8 5.0 6.2 6.6 7.0 5.6 6.0 5.2 6.4 6.8 0.68 0.70 0.72 0.74 0.76 0.78 0.80 85c 25c -40c enable high voltage vs. input voltage input voltage (v) enable high voltage (v) 5.4 5.8 5.0 6.2 6.6 7.0 5.6 6.0 5.2 6.4 6.8 0.880 0.885 0.890 0.895 0.900 0.905 0.910 85c 25c -40c battery recharge voltage threshold vs. temperature (r set = 1.58k; i ch_cc = 1000ma; AAT3698-1) temperature (c) battery recharge voltage threshold (v) -15 10 -40 35 60 85 4.00 4.02 4.04 4.06 4.08 4.10 4.12 4.14 4.16 4.18 4.20 battery recharge voltage threshold vs. temperature (r set = 3.16k; i ch_cc = 500ma; AAT3698-1) temperature (c) battery recharge voltage threshold (v) -15 10 -40 35 60 85 4.00 4.02 4.04 4.06 4.08 4.10 4.12 4.14 4.16 4.18 4.20 typical characteristics ? ovp ovp on time ( r load = 100) time (50s/div) input voltage (top) (v) inchr voltage (bottom) (v) 5.0 6.0 7.0 8.0 9.0 -2 0 2 4 6 ovp response time ( r load = 100) time (50s/div) input voltage (top) (v) inchr voltage (bottom) (v) 5.0 6.0 7.0 8.0 9.0 -2 0 2 4 6
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 9 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 typical characteristics ? ovp ovp trip point threshold voltage vs. temperature temperature (c) ovp trip point threshold voltage (v) -15 10 -40 35 60 85 6.95 7.00 7.05 7.10 7.15 7.20 7.25 rising threshold falling threshold pok on delay time ( r load = 100) time (2s/div) input voltage (top) (v) pok voltage (bottom) (v) 6.0 7.0 8.0 9.0 -4 -2 0 2 4 6 typical characteristics ? ldo ldo load transient ( v in = 5.4v; i out = 1ma to 30ma; c out = 1f) time (100s/div) output current (top) (ma) output voltage (bottom) (mv) 0 20 40 60 -100 -50 0 50 100 ldo load transient ( v in = 5.4v; i out = 10ma to 30ma; c out = 1f) time (100s/div) output current (top) (ma) output voltage (bottom) (mv) -100 -80 -60 -40 -20 0 20 40 60 -100 -50 0 50 100 150 200 250 300 ldo line transient ( v in = 5.4v to 6.4v; i out = 30ma; c out = 1f) time (100s/div) input voltage (top) (v) output voltage (bottom) (v) 5 6 7 4.6 4.7 4.8 4.9 5 5.1
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 10 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 typical characteristics ? ldo ldo output voltage accuracy vs. temperature (i out = 10ma) temperature (c) ldo output voltage error (%) -15 10 -40 35 60 85 -0.500 -0.400 -0.300 -0.200 -0.100 0.000 0.100 0.200 0.300 0.400 0.500 ldo output voltage vs. temperature (i out = 10ma) temperature (c) ldo output voltage (v) -15 10 -40 35 60 85 4.980 4.985 4.990 4.995 5.000 5.005 5.010 ldo output voltage accuracy vs. input voltage (i out = 30ma) input voltage (v) output voltage error (%) 5.4 5.6 5.2 5.8 6.0 6.2 6.4 6.6 6.8 7.0 -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 85c 25c -40c ldo output voltage accuracy vs. output current (v in = 5.5v) output current (ma) ldo output voltage error (%) 1.0 0.1 10 100 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 85c 25c -40c dropout voltage vs. output current output current (ma) dropout voltage (mv) 510 01520253035 0 50 100 150 200 250 85c 25c -40c dropout voltage vs. temperature (i out = 30ma) temperature (c) dropout voltage (mv) -15 10 -40 35 60 85 0 50 100 150 200 250
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 11 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 functional description the AAT3698-1/-2 is a high performance battery charger ic which is designed to charge single-cell lithium-ion or polymer batteries with up to 1.6a of current from an external power source. it is a stand-alone charging solu- tion requiring minimum input components. the AAT3698- 1/-2 also includes a fast turn-off over-voltage protection (ovp) circuit with +28v which consists of a low-resis- tance mosfet in series with the charge control circuit. the AAT3698-1/-2 also features under-voltage lockout protection, power ok, charge status monitoring, and a 5.0v ldo with 50ma output through the ovp switch. battery charging profile figure 1 illustrates the entire battery charging operation profile, which consists of three (AAT3698-2) or four (AAT3698-1) phases: 1. preconditioning (trickle) charge 2. constant current charge (cc) 3. constant voltage charge (cv) 4. automatic recharge (AAT3698-1 only) preconditioning charge battery charging commences only after the AAT3698-1/- 2 checks several conditions in order to maintain a safe charging environment. the input supply must be above the minimum operating voltage (v min ) or under-voltage lockout threshold (v uvlo ) and the enable pin must be low for the charging sequence to begin. when these condi- tions have been met and a battery is connected to the bat pin, the AAT3698-1/-2 checks the state of the bat- tery and determines which charging mode to apply. if the battery voltage is below the preconditioning voltage threshold (v min ), then the AAT3698-1/-2 begins precon- ditioning the cell (trickle charging) by charging at 10% of the programmed constant current. for example, if the programmed fast charge current is 1000ma, then the preconditioning (trickle) charge current is 100ma. battery cell preconditioning is a safety precaution for deeply discharged cells and will also reduce the power dissipation in the internal series pass transistor when the voltage across the device is at greatest potential. functional block diagram charge control current sense bat gnd in inchr term ovp control ovp switch uvlo ovp flag reverse blocking ldoout pok 5v ldo bats abi abo pok pok 200k 200k + - in bat iset nobat 1600k en stat bat
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 12 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 constant current fast charge battery cell preconditioning charge continues until the battery voltage reaches the preconditioning voltage threshold (v min ). at this point, the AAT3698-1/-2 begins the constant current charge phase. the current level for this mode is programmed using a single resistor from the iset pin to ground. the programmed current can be set from a minimum of 100ma up to a maximum of 1.6a. constant voltage charge constant current charging will continue until the battery voltage reaches the constant output voltage, v co . the AAT3698-1/AAT3698-2 then transitions to constant volt- age mode, in which the charge ic regulates the battery voltage to a constant output voltage (factory programmed to 4.2v). the charging current decreases during this phase. the charger regulates battery voltage at 4.2v and continues to charge the battery until the charge current reaches the termination level set by r term . when the charge current reaches its termination level i term , charg- ing is terminated. AAT3698-1 the charger turns off the series pass device even if the en pin is held low and the device automatically enters a power-saving sleep state. during this time, the series pass device blocks current in both directions, preventing the battery from discharging through the ic. the device remains in sleep mode even if the charger source is dis- connected. when the battery terminal voltage drops below the v rch threshold, the AAT3698-1 resumes charg- ing operation if no fault is detected. AAT3698-2 the charger regulates the battery voltage at 4.2v and continues to charge the battery with a current lower than the charge termination current until a logic high is applied to the en pin to stop charging. battery voltage battery current preconditioning charge constant current charge constant voltage charge i ch _cc v co(reg) i ch _trk v min i ch _term stat turns off charger turns off when en = high (AAT3698-2) en stat charger turns off when i ch_cc = i ch_term (AAT3698-1) figure 1: AAT3698-1/-2 battery charging profile.
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 13 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 power fail stat = pok = high pok = high pre-charge stat = pok = low en = low & v in v bat v bovp fast charge v bat < v min voltage mode charge any states charger off stat = high, pok = low stat = pok = low stat = pok = low en = high or v in v bat or v bovp v bat charge complete t loop t loop v bat v min v bat < v rch (AAT3698-1 only) i bat = i term v bat v co(reg) stat = high, pok = low charge off for AAT3698-1 charge on for AAT3698-2 pok = low figure 2: charger operational state diagram. charge status output the AAT3698-1/-2 provides battery charging status via the charge status indication pin (stat). this pin is inter- nally connected to an n-channel open-drain mosfet, which can be used as a logic signal or to drive an exter- nal led. the stat pin pulls high to indicate charge completion. the charge completion occurs only when the en pin is pulled high or the charge current reaches its charge termination current level. the status pin indicates the conditions as described in table 1. charge status stat v in > v uvlo high v in > v ovp high the charge current is below its termination level high en pin is pulled high high battery is charging and the charge current is above its termination level. low table 1: led status indicator. enable / disable the AAT3698-1/-2 provides an enable function to turn the charger ic on and off. the enable (en) pin is internally pulled down with 200k . when en is pulled down or left floating, the device begins normal operation . when en is pulled to a logic high level, the AAT3698-1/-2's charging circuit will be shut down and forced into sleep state. the over-voltage protection/ldo circuit remains active even in sleep state. in sleep state, charging is halted regardless of the battery voltage or charging state. when the device is re-enabled, the charge control circuit automatically resets and resumes charging functions with the appropri- ate charging mode based on the battery charge state and measured cell voltage at the bat pin. under-voltage lockout (uvlo) the AAT3698-1/-2 has a typical under-voltage lockout threshold of 3v. when the input voltage is less than the uvlo level, ovp and the charger are turned off. the uvlo is designed with 150mv hysteresis to ensure circuit stability. over-voltage protection in normal operation, the ovp protection device acts as a load switch, connecting the power source from in to inchr. this switch is designed with very low resistance to minimize the voltage drop between the power source and the charger and to reduce the power dissipation. when the voltage on the power source exceeds the ovp trip point, v ovp , the switch immediately turns off and dis- connects the load and the charger from the power source and preventing damage to any downstream components. simultaneously, the fault flag is raised, alerting the sys- tem. if an over-voltage condition is applied at the time of the device enable, the switch remains open (off). power ok output flag the power ok flag (pok ) is an active-low open-drain power good reporting output. a pull-up resistor should be connected from pok to another system power volt- age. in the event of an under-voltage or over-voltage condition, pok will be de-asserted. after the over-volt- age fault is released, pok will be asserted. pok will be also de-asserted when v in is lower than v bat when en is low. when en is high, pok is asserted only after uvlo and ovp conditions.
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 14 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 power status pok v in < v uvlo high v in > v ovp high v in < v bat + v in_bat_os , en = low high v uvlo v bat + v in_bat_os v in v ovp low table 2: pok flag indicator. automatic booting an auxiliary or gate provides a booting enable signal from two inputs, an internal power ok signal and an external abi signal. the abo states are listed in table 3. v bat pok abi abo yes low x high yes high high high yes high low low no x x low table 3: automatic booting. battery detection when the nobat pin is set to logic high level, the char- ger is disabled. when it is set to logic low level, the charger is enabled. this pin is internally pulled to the ldoout pin through a 1.6m resistor. battery over-voltage protection an over-voltage event is defined as a condition where the voltage at the bat pin exceeds the maximum battery charge voltage and is set by the battery over-voltage protection threshold (v bovp ). if an over-voltage condition is sensed by the bats pin, the AAT3698-1/-2 charge control shuts down the device until the voltage at the bat pin drops below v bovp . the AAT3698-1/-2 resumes normal charging operation after the over-voltage condi- tion is removed. digital thermal loop control the AAT3698-1/-2 includes a thermal management sys- tem. the system is activated when the die temperature reaches its preset internal temperature threshold (110c) and maintains the die temperature by reducing the con- stant charge current. over-temperature shutdown the AAT3698-1/-2 has a thermal protection control cir- cuit which shuts down charging functions if the internal die temperature exceeds the preset thermal limit thresh- old (140c). once the internal die temperature falls below the thermal limit, normal operation resumes in the previous charging state. linear dropout regulator the AAT3698-1/-2's linear dropout regulator output (ldoout) provides 5v output with 30ma typical load current capabilities. ic input the AAT3698-1/-2 has an ic input pin that is internally connected to ground through a 100k resistor. float or ground this pin for normal operation.
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 15 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 application information constant charge current the constant current charge level is user programmed with a set resistor connected between the iset pin and ground. the tolerance of the set resistor determines the accuracy of the constant charge current as well as the preconditioning trickle charge current. for this reason, a 1% tolerance metal film resistor is recommended for the set resistor function. the constant charge current level from 100ma to 1.6a is set by selecting the appropriate resistor value from table 4. the approximate charge current (i ch_cc_typ ) can be found using the following formula: v iset r iset i ch_cc_typ = k iset = v iset gm out where: i ch_cc_typ v iset k iset r set gm out = = 250ms = when r set = 3.16k and k iset = 790. typical constant charge current (ma) set resistor value (k ) 50 31.6 100 15.8 200 7.87 400 3.92 500 3.16 600 2.67 800 1.96 1000 1.58 1580 1.00 table 4: r set values figure 3 shows the relationship of constant charging cur- rent and set resistor values for the AAT3698-1/-2. r set (k ) constant charging current (ma) 1 10 100 1000 10000 110 0.1 100 figure 3: constant charging current vs. set resistor values. charge termination current the charge termination current level is programmed by an external resistor (r term ) connected between the term pin and ground. use the resistor values listed in table 5 to set the desired charge termination current. r term (k )i ch_term (%) 6.65 5% 13.3 10% 26.7 20% 40.2 30% 53.6 40% table 5: charge termination current programming resistor values. r term (k ) i ch_term (%) 0% 10% 20% 30% 40% 50% 10 20 030405060 figure 4: charge termination current vs. r term .
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 16 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 use the following formula to set the charge termination current, i ch_term . 15a r term 2v i ch_term = i ch_cc i ch_term is set by default to 10% of i ch_cc when the term pin is connected to the inchr pin. when the charge current reaches the termination current, the stat pin will be set to high impedance, but the charge termination current will continue to flow until the en pin is toggled high. to set charge termination current thresh- old to the lowest level, connect the term pin to ground. battery connection a single cell li-ion/polymer battery should be connected between the bat pin and ground. status indicator display simple system charging status can be displayed using a single led in conjunction with the AAT3698-1/-2's stat pin. this pin has a simple switch connecting the led?s cathode to ground. refer to table 1 for led display definitions. the led anodes should be connected to inchr or other system power supply that does not exceed 7v, depending upon system design require- ments. the led should be biased with as little current as necessary to create reasonable illumination; therefore, a ballast resistor should be placed between the led cath- ode and the stat pin. led current consumption will add to the overall thermal power budget for the device pack- age, so it is wise to keep the led drive current to a minimum. 2ma should be sufficient to drive most low- cost green or red leds. driving an individual status led with over 8ma is not recommended. the required ballast resistor value can be estimated using the following formulas: when connecting to the adapter supply with a red led: v adp - v f(led) i led(stat) r b(stat) = example: 5.5v - 2.0v 2ma r b(stat) = = 1.75k note: red led forward voltage (v f ) is typically 2.0v @ 2ma. when connecting to the usb supply with a green led: v usb - v f(led) i led(stat) r b(stat) = example: 5.0v - 3.2v 2ma r b(stat) = = 900 note: green led forward voltage (v f ) is typically 3.2v @ 2ma. capacitor selection input capacitor (in) a 1 f or larger capacitor is typically recommended for c in . c in should be located as close to the device in pin as practically possible. ceramic, tantalum, or aluminum electrolytic capacitors may be selected for c in . there is no specific capacitor equivalent series resistance (esr) requirement for c in . however, for higher current opera- tion, ceramic capacitors are recommended for c in due to their inherent capability over tantalum capacitors to withstand input current surges from low impedance sources such as batteries in portable devices. typically, 50v rated capacitors are required for the appli- cation to prevent any surge voltage. ceramic capacitors selected as small as 1206 are available which can meet these requirements. capacitors with other voltage rating can also be used for known input voltage applications. charger input capacitor (inchr) a 1 f decoupling capacitor is recommended to be placed between inchr and gnd. this capacitor should be locat- ed as closely and routed as directly as practically possible to the device's inchr pin with a good ground return path for maximum device over-voltage protection perfor- mance.
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 17 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 charger output capacitor (bat) the AAT3698-1/-2 only requires a 1 f ceramic capacitor on the bat pin to maintain circuit stability. this value should be increased to 10 f or more if the battery con- nection is made at any distance from the charger output. if the AAT3698-1/-2 is used in applications where the battery can be removed from the charger, such as desk- top charging cradles, an output capacitor greater than 10 f may be required to prevent the device from cycling on and off when no battery is present. linear regulator output capacitor (ldoout) for proper load voltage regulation and operational stabil- ity, a capacitor is required between ldoout and gnd. the output capacitor connection to the ldo regulator ground pin should be made as directly as practically pos- sible for maximum device performance. since the regu- lator has been designed to function with very low esr capacitors, multilayer ceramic capacitors in the 1.0 f to 10 f range are recommended for best performance. applications utilizing the exceptionally low output noise and optimum power supply ripple rejection of the AAT3698-1/-2 should use a value of 2.2 f or greater for the ldo?s output capacitor. printed circuit board layout recommendations for proper thermal management and to take advantage of the low r ds(on) of the AAT3698-1/-2, a few circuit board layout rules should be followed: in and bat should be routed using wider than normal traces, and gnd should be connected to a ground plane. to maximize package thermal dissipation and power handling capac- ity of the AAT3698-1/-2 tdfn33-14 package, solder the exposed paddle of the ic to the thermal landing of the pcb, where the thermal landing is connected to the ground plane. if heat is still an issue, multi-layer boards with dedicated ground planes are recommended. also, adding more thermal via holes on the thermal landing would help transfer heat to the pcb effectively.
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 18 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 figure 5: AAT3698-1/-2 evaluation board figure 6: AAT3698-1/-2 evaluation board top side layout. mid1 layer layout. figure 7: AAT3698-1/-2 evaluation board figure 8: AAT3698-1/-2 evaluation board mid2 layer layout. bottom side layout.
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 19 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 1f c1 1f c2 en jp1 1 2 vin gnd c1 1206 x7r 1f 50v grm31mr71h105ka88 c2, c3, c4 0603 x5r 1f 10v grm188r61a105ke34 batgnd 1 2 green led d2 red led d1 +5 r1 r2 r3 13.3k r4 3.16k +5 1f c3 ldoout tp3 inchr tp1 1f c4 5v tp2 bat inchr 1 in 2 ldoout 3 pok 4 stat 5 abi 13 term 7 gnd 8 nobat 12 en 9 iset 10 ic 11 abo 6 bat 14 AAT3698-tdfn33-14 u1 AAT3698-x nobat jp2 r5 (optional) abi tp4 abo tp5 5v tp6 r6 (optional) figure 7: AAT3698-1/-2 evaluation board schematic. component part number description manufacturer u1 AAT3698iwo-1/-2 1.6a linear li-ion/polymer battery charger in tdfn33-14 package skyworks c1 grm31mr71h105ka88 ceramic 1 f/50v, 10%, x7r, 1206 murata c2, c3, c4 grm188r61a105ke34 ceramic 1 f/10v, 10%, x5r, 0603 murata r1, r2 chip resistor 1.5k , 5%, 1/4w, 0603 vishay r3 chip resistor 13.3k , 1%, 1/4w, 0603 vishay r4 chip resistor 1.58k , 1%, 1/4w, 0603 vishay r5 chip resistor 10k , 1%, 1/4w, 0603 vishay r6 chip resistor 0 , 5%, 1/4w, 0603 vishay d1 lst-c190ckt red led, 0603 lite-on inc. d2 lst-c190gkt green led, 0603 lite-on inc. jp1, jp2 prpn401paen conn. header, 2mm zip sullins electronics table 6: AAT3698-1/-2 evaluation board bill of materials (bom). product constant regulated output voltage (v) automatic charge termination and recharge sequencing when i bat i term input ovp trip point (v) preconditioning voltage threshold (v) AAT3698-1 4.2 yes 7.25 2.6 AAT3698-2 4.2 no 7.25 2.6 table 7: AAT3698 options.
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 20 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold . 3. the leadless package family, which includes qfn, tqfn, dfn, tdfn and stdfn, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. a solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder c onnection. ordering information product package marking 1 part number (tape and reel) 2 AAT3698-1 tdfn33-14 a5xyy AAT3698iwo-4.2-1-t1 AAT3698-2 tdfn33-14 d6xyy AAT3698iwo-4.2-2-t1 skyworks green? products are compliant with all applicable legislation and are halogen-free. for additional information, refer to skyworks de?ition of green , document number sq04-0074. package information tdfn33-14 top view bottom view 3.000 0.050 index area 3.000 0.050 detail "a" 1.650 0.050 2.500 0.050 0.203 ref 0.750 0.050 0.000 + 0.100 - 0.000 detail "a" side view 0.425 0.050 0.400 bsc 0.180 0.050 pin 1 indicator (optional) all dimensions in millimeters.
AAT3698 data sheet 1.6a linear li-ion battery charger in a 3x3 tdfn package 21 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201902b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 copyright ? 2012 skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skyworks solutions, inc. (?skyworks?) products or services. these m aterials, including the information contained herein, are provided by skyworks as a service to its customers and may be used for informational purposes only by the customer. skyworks assumes no responsibility fo r errors or omissions in these materials or the information contained herein. sky- works may change its documentation, products, services, speci cations or product descriptions at any time, without notice. skyworks makes no commitment to update the materials or informati on and shall have no responsibility whatsoever for con icts, incompatibilities, or other dif culties arising from any future changes. no license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document . skyworks assumes no liability for any materials, products or information provided here- under, including the sale, distribution, reproduction or use of skyworks products, information or materials, except as may be p rovided in skyworks terms and conditions of sale. the materials, products and information are provided ?as is? without warranty of any kind, whether express, implied, statutory, or otherwise, including fitness for a particular purpose or use, merchantability, performance, quality or non-infringement of any intellectual property right; all such warranti es are hereby expressly disclaimed. skyworks does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. sk yworks shall not be liable for any damages, in- cluding but not limited to any special, indirect, incidental, statutory, or consequential damages, including without limitation , lost revenues or lost profits that may result from the use of the materials or information, whether or not the recipient of materials has been advised of the possibility of such damage. skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the skyworks products could lead to personal injury, death, physical or en- vironmental damage. skyworks customers using or selling skyworks products for use in such applications do so at their own risk and agree to fully indemnify skyworks for any damages resulting from such improper use or sale. customers are responsible for their products and applications using skyworks products, which may deviate from published speci cations as a result of design defects, errors, or operation of products outside of pub- lished parameters or design speci cations. customers should include design and operating safeguards to minimize these and other risks. skyworks assumes no liabi lity for applications assistance, customer product design, or damage to any equipment resulting from the use of skyworks products outside of stated published speci cations or parameters. skyworks, the skyworks symbol, and ?breakthrough simplicity? are trademarks or registered trademarks of skyworks solutions, inc ., in the united states and other countries. third-party brands and names are for identi cation purposes only, and are the property of their respective owners. additional information, including relevant terms and co nditions, posted at www.skyworksinc.com, are incorporated by reference.

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