advanced power electronics corp. ape8838 dual channel ldo regulators with enable features description input voltage range : 2.5v to 6v varied fixed output voltage combinations 150mv dropout at 100ma output current (vout R 2.8v) output current: 200ma/channel (typ.) low quiescent current standby current: 2ua (typ.) current limit and short current protections thermal shutdown protection fast transient response low esr capacitor compatible (x7r, x5r) available in the 6-pin pb-free sot-26 and dfn 2x2 packages typical application ordering information table1. data and specifications subject to change without notice 201003171 1 the ape8838 is a high accurately, low noise, high ripple rejection ratio, low dropout, dual cmos ldo voltage regulators with enable function. the en function allows the output of each regulator to be turned off independently, resulting in greatly reduced power consumption. the ape8838 has the soft start function to suppress the inrush current. the current limit is over 250ma per channel and also operates as a short protection for the output current limiter. the output voltage for each regulator is set independently by metal trimming. the ape8838 is fully compatible with low esr ceramic capacitors, reducing cost and improving output stability. this high level output stability is maintained even during frequent load fluctuations, due to the excellent transient response performance and high psrr achieved across a broad range of frequency. it is available in the sot-26 and dfn 2x2 packages. c in 1uf vout2 vout1 gnd out2 c v out2 out1 c ape8838 1uf 1uf out1 v en1 en2 v in v in ape8838 x x - hf y : sot-26 output type package (refer table) gn2 : dfn 2x2 halogen free a : 1.5v+2.8v h : 2.8+3.0v r : 3.3v+1.8v b : 1.8v+2.8v j : 2.8+3.3v t : 1.5v+3.3v c : 1.8v+2.6v k : 3.0+3.0v v : 1.5v+3.0v d : 1.8v+3.3v l : 3.0v+3.3v w : 1.2v+2.8v e : 2.5v+2.8v m : 3.3+3.3v x : 1.2v+1.2v f : 2.8v+1.2v p : 1.8v+3.0v y : 2.8v+1.5v g : 2.8v+1.8v q : 1.5v+2.5v output type code : (v out1 +v out2 )
advanced power electronics corp. ape8838 absolute maximum ratings (at t a =25c) input voltage (vin) ----------------------------------------- gnd - 0.3 to + 6v output current (i o1 +i o2 ) ----------------------------------- 500ma output voltage (vout1/vout2) ---------------------- - gnd - 0.3 to vin + 0.3 enable voltage (ven1/ven2) -------------------------- - gnd - 0.3 to vin + 0.3 power dissipation (p d ) ------------------------------------ - 250mw storage temperature range (t st ) --------------------- -40 to 150c operating temperature range (t op ) ------------------ -40 to 85c junction temperature range (t j ) --------------------- - -40 to 125c thermal resistance from junction to case (rth jc ) 180 o c/w 250 o c/w note. rth ja is measured with the pcb copper area of approximately 1 in 2 (multi-layer). that need connect to gnd pin. package information electrical specifications (t a =25 , unless otherwise noted.) parameter sym test condition min typ max units input voltage v in note1. 2.5 - 5.5 v i out =1ma, v in =5v,v out >2.0v -2 - 2 % i out =1ma, v in =5v,v out Q 2.0v -0.04 - 0.04 v quiescent current i cc i out1,2 =0ma, v in =5v - 60 100 ua i out =0.2a, v o =v o -2%, v out =1.5v - 1000 1200 i out =0.2a, v o =v o -2%, v out =1.8v - 700 900 i out =0.2a, v o =v o -2%, v out >2.5v - 300 400 current limit (note2) i limit v in =v out (t) + 1.0v, v en =v in 250 - - ma short circuit current i sc v out <1.0v, each channel - 150 - ma line regulation ? v line i out =1ma, v in =v out +1v to 6.0v - 0.2 0.3 %/v load regulation (note 3) ? v load i out =1~100ma, v in =v out +1v - 0.01 0.03 %/ma ripple rejection psrr f=120hz, i out = 30ma - 60 - db output voltage temperature coefficient i out =30ma (note 4) - + 100 - ppm/oc v enh 2- - v enl - - 0.8 enable pull-high current i en v en1,2 = 0v - 1 2 ua shutdown current i sd i out1,2 =0ma, v in =5v, v en1,2 =0v - 2 4 ua thermal shutdown temperature tst - 150 -oc thermal shutdown hysterisis tsh - 40 -oc thermal resistance from junction to ambient (rth ja ) enable input threshold output voltage accuracy ? v out dropout voltage v drop v 2 mv (top view) sot-26 3 2 6 4 1 vin gnd en1 vout1 5 en2 vout2 ape8838 dfn 2x2 (6l) vout2 en1 en2 1 2 3 4 5 6 vin gnd vout1 (top view) gnd ape8838
advanced power electronics corp. ape8838 note 1. v in (min) =v out +v drop note 2. current limit is measured at constant junction temperature by using pulsed testing with a low on time. note 3. regulation is measured at constant junction temperature by using pulsed testing with a low on time. note 4. guaranteed by design. pin descriptions pin symbol pin description vin input voltage gnd common ground pin en1 vout1 enable control pin en2 vout2 enable control pin vout1 output1 voltage vout2 output2 voltage block diagram function description 3 current limit1 - + vin vout1 gnd error amp bandgap thermal shutdown enable1 en1 current limit2 - + error amp enable2 en2 vout2 the ape8838 is a highly accurate, dual, low noise, cmos ldo voltage regulators with enable function. the output voltage for each regulator is set independently by fuse trimming. as illustrated in function block diagram, it consists of a reference, error amplifier, a p-channel pass transistor, an on/off control logic and an internal feedback voltage divider. the band gap reference is connected to the error amplifier, which compares the reference with the feedback voltage and amplifies the voltage difference. if the feedback voltage is lower than the reference voltage, the pass- transistor gate is pulled lower, which allows more current to pass to the v out pin and increases the output voltage. if the feedback voltage is too high, the pass transistor gate is pulled up to decrease the output voltage. the output voltage is feed back through an internal resistive divider connected to v out pin. additional blocks include an output current limiter, thermal sensor, and shutdown logic.
advanced power electronics corp. ape8838 enable function dropout voltage current limit thermal shutdown protection application information input capacitor 4 thermal shutdown protection limits total power dissipation of ape8838. when the junction temperature exceeds t j = +150c, a thermal sensor turns off the pass transistor, allowing the ic to cool down. the thermal sensor turns the pass transistor on again after the junction temperature cools down by 40c, resulting in a pulsed output during continuous thermal shutdown conditions. thermal shutdown protection is designed to protect the ape8838 in the event of fault conditions. for continuous operation, the absolute maximum operating junction temperature rating of t j = +125c should not be exceeded. en1 and en2 pin start and stop the corresponding outputs independently. when the en pin is switched to the power off level, the operation of all internal circuit stops, the build-in p-channel mosfet output transistor between pins vin and vout is switched off, allowing current consumption to be drastically reduced. a regulator?s minimum input-output voltage differential, or dropout voltage, determines the lowest usable supply voltage. the ape8838 use a p- channel mosfet pass transistor, its dropout voltage is function of drain-to-source on- resistance r ds (on) multiplied by the load current. v dropout = v in -v out = r ds(on) x i out each channel of ape8838 includes a fold back current limiter. it monitors and controls the pass transistor?s gate voltage, estimates the output current, and limits the output current within 250ma. like any low-dropout regulator, the ape8838 requires input and output decoupling capacitors. the device is specifically designed for portable applications requiring minimum board space and smallest components. these capacitors must be correctly selected for good performance (see capacitor characteristics section). please note that linear regulators with a low dropout voltage have high internal loop gains which require care in guarding against oscillation caused by insufficient decoupling capacitance. an input capacitance of 1f is required between input pin and ground directly (the amount of the capacitance may be increased without limit). the input capacitor must be located less than 1cm from the device to assure input stability. a lower esr capacitor allows the use of less capacitance, while higher esr type (like aluminum electrolytic) requires more capacitance. capacitor types (aluminum, ceramic and tantalum) can be mixed in parallel, but the total equivalent input capacitance/ esr must be defined as above to stable operation. there are no requirements for the esr on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitance will be 1f over the entire operating temperature range.
advanced power electronics corp. ape8838 output capacitor thermal considerations 5 the ape8838 series can deliver a current of up to 200ma/channel over the full operating junction temperature range. however, the maximum output current must be debated at higher ambient temperature to ensure the junction temperature does not exceed 125c. with all possible conditions, the junction temperature must be within the range specified under operating conditions. power dissipation can be calculated based on the output current and the voltage drop across regulator. p d = (v in - v out ) i out + v in x i gnd the final operating junction temperature for any set of conditions can be estimated by the following thermal equation: p d (max) = (t j (max) - t a ) / ja where t j (max) is the maximum junction temperature of the die (125c) and t a is the maximum ambient temperature. the junction to ambient thermal resistance ( ja ) sot-26 package at recommended minimum footprint is 250c/w. the ape8838 is designed specifically to work with very small ceramic output capacitors. a ceramic capacitor (temperature characteristics x7r, x5r) in 1 f is suitable for the ape8838 application. the recommended minimum capacitance for the device is 1 f, x5r or x7r dielectric ceramic, between vout and gnd for stability, but it may be increased without limit. higher capacitance values help to improve transient. the output capacitor's esr is critical because it forms a zero to provide phase lead which is required for loop stability.
package outline : sot-26 millimeters symbols min nom max a 2.70 2.90 3.10 b 2.60 2.80 3.00 c 1.40 1.60 1.80 d 0.30 0.43 0.55 e 0.00 0.05 0.10 g i j l 1.all dimension are in millimeters. 2.dimension does not include mold protrusions. part marking information & packing : sot-26 0.37ref 0.95ref 1.90ref advanced power electronics corp. 0.12ref h 1.20ref rr&yy part number : rr d date code yy:2004,2008,2012? yy :2003,2007,2011? y y:2002,2006,2010? yy :2001,2005,2009? c b l l g e j i a h vout code see the table1.
package outline : dfn 2x2-6l millimeters min nom max a 0.80 0.85 1.00 a1 0.00 0.05 b 0.20 0.25 0.30 c 0.195 0.203 0.211 d 1.95 2.00 2.05 d2 0.55 0.60 0.65 e 1.95 2.00 2.05 e2 1.15 1.20 1.25 e l 0.3 0.35 0.4 1.all dimension are in millimeters. 2.dimension does not include mold protrusions. part marking information & packing : dfn 2x2-6l draw no. i1-n3s6-g-v00 0.65 (ref) symbols advanced power electronics corp. date code (yws) y:year wweek s sequence rr& yws vout code (see the table1.) 1 e2 d l d e b e a1 a c
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