________________ge ne ra l de sc ript ion the max1615/max1616 are micropower, sot23-5 lin- ear regulators that supply always-on, keep-alive po wer to cmos ram and microcontrollers (cs) in systems with high-voltage batteries. key features include w ide input voltage range, low dropout voltage, and low q ui- escent supply current. despite a miserly 8a (max) no-load supply current, the max1615/max1616 have excellent line-transient response and ac power-supply rejection ratio. they provide a clean, fixed 5v or 3.3v output (max1615) or an adjustable 1.24v to 28v output (max1616), even when subjected to fast supply-voltage changes that occur during the switchover from battery to ac adap ter input power. the space-saving sot23-5 package has excellent thermal characteristics and tolerates up to 571mw of power dissipation. fault protection is pro vid- ed by internal foldback current limiting and therma l- shutdown circuitry. the max1615/max1616 are now available in lead-free packages. ________________________applic a t ions cmos/rtc backup power microcontroller power notebook computers smart-battery packs pdas and handy-terminals battery-powered systems ____________________________fe a t ure s ? 4v to 28v input range ? 8a (max) quiescent supply current ? <1a shutdown supply current ? 3.3v or 5v, pin-selectable output (max1615)adjustable 1.24v to 28v output (max1616) ? 30ma output current ? 2% initial output accuracy ? thermal-overload protection ? 5-pin sot23 package ? low cost m ax 1 6 1 5 /m ax 1 6 1 6 h igh-volt a ge , low -pow e r line a r re gula t ors for n ot e book com put e rs ________________________________________________________________ maxim integrated products 1 gnd 5/3 (fb) out ( ) are for max1616. 1 5 shdn in max1615 max1616 sot23-5 top view 2 3 4 ___________________pin configura t ion in out shdn gnd 5/3 battery c in 0.1 f c out 4.7 f output voltage max1615 ____________t ypic a l ope ra t ing circ uit 19-1225; rev 3; 9/04 part max1615 euk-t -40c to +85c temp range pin-package 5 sot23-5 _______________orde ring i nform a t ion for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxims website at www.maxim-ic.com. sot top mark abzd max1616 euk-t abze -40c to +85c 5 sot23-5 + denotes lead-free package. max1615euk+t abzd -40c to +85c 5 sot23-5 max1616euk+t abze -40c to +85c 5 sot23-5 downloaded from: http:///
v m ax 1 6 1 5 /m ax 1 6 1 6 h igh-volt a ge , low -pow e r line a r re gula t ors for n ot e book com put e rs 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v in = 15v, shdn = v in , i load = 5a, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) (note 2) stresses beyond those listed under absolute maximu m ratings may cause permanent damage to the device . these are stress ratings only, and functional operation of the device at these or any other condi tions beyond those indicated in the operational sec tions of the specifications is not implied. exposur e to absolute maximum rating conditions for extended per iods may affect device reliability. in to gnd .......................................... .......................-0.3v to 30v terminal voltages to gnd shdn to gnd ...........................................-0 .3v to (v in + 0.3v) 5/ 3 to gnd ............................................ -0.3v to (v out + 0.3v) fb (max1616) to gnd .........................-0.3v to (v out + 0.3v) out to gnd......................................... ..................-0.3v to 30v out short-circuit to gnd ........................... ....................30sec continuous out current............................. ........................40ma continuous power dissipation (t a = +70c) (note 1) sot23-5 (derate 7.1mw/c above +70c).............. .....571mw operating temperature range max161_euk-t ...................................... .........-40c to +85c storage temperature range .......................... ...-65c to +160c lead temperature (soldering, 10s) .................. ...............+300c note 1: see operating region and power dissipation section. fb input current (max1616) i fb -10 12 30 na v fb = 1.3v fb threshold (max1616) (note 3) v fbt 1.215 1.240 1.265 v fb = out, v in = 6v to 28v t a = +25c, i load = 1ma 1.18 1.28 t a = t min to t max , i load = 5a to 30ma output voltage (max1615) (note 3) 3.15 3.48 i load = 5a to 30ma, t a = t min to t max , v in = 6v to 28v 5/ 3 = gnd 4.75 5.25 5/ 3 = out 4.95 5.05 5.15 5/ 3 = out 3.26 3.33 3.40 i load = 1ma, t a = +25c, v in = 6v to 28v 5/ 3 = gnd dropout supply current 70 a output set to 5v, v in = 4v t a = +25c t min = t min to t max t a = +25c start-up overshoot v osh 0.5 %v out r l = 500 ? , c out = 10f within 90% of nominal output voltage parameter symbol min typ max units shutdown supply current i in 3 a 1.5 minimum load current 5 a input voltage range v in 42 8 v 6.2 8 supply current i in 15 a output current limit 100 ma out reverse leakage current 70 a capacitive load requirements (note 5) 0.16 f/ma start-up time response 1 ms conditions shdn = gnd (shutdown mode) v in = 6v in = unconnected, v out forced to 5v shdn = in, t a = +25c max1615 shdn = in, v in = 6v to 28v, t a = t min to t max rising edge of in or shdn to out within specifi- cation limits, r l = 500 ? , c out = 6.8f, v out set to 5v max1616 0.23 dropout voltage ? v do 350 mv i load = 30ma (note 4) v downloaded from: http:///
m ax 1 6 1 5 /m ax 1 6 1 6 h igh-volt a ge , low -pow e r line a r re gula t ors for n ot e book com put e rs _______________________________________________________________________________________ 3 electrical characteristics (continued) (v in = 15v, shdn = v in , i load = 5a, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) (note 2) note 2: limits are 100% production tested at t a = +25c. limits over the operating temperature rang e are guaranteed through correlation using standard quality-control (sqc) me thods. note 3: pulse tested at v in = 28v, i load = 30ma to avoid exceeding package power-dissipation limits. note 4: guaranteed by design. tested with v out set to 5v. dropout voltage is tested by reducing th e input voltage until v out drops to 100mv below its nominal value, measured with v in starting 2v above v out . note 5: use at least 1f minimum for light loads. add 0.125 f/ma (0.2f/ma for the max1616) for loads greater than 100a, not production tested. see capacitor selection in the applications information section. 60 0 03 0 safe load-current operating area vs. supply voltage 20 10 50 max1615-01 supply voltage (v) output current (ma) 10 52 5 20 15 40 30 power- dissipation limit region v out = 5v 8 0 53 0 ground current vs. supply voltage at various loads 2 3 1 6 7 max1615-02 supply voltage (v) ground current (ma) 10 25 20 15 5 4 65ma 55ma 45ma 35ma 15ma 5ma 25ma 9.0 5.0 53 0 supply current vs. supply voltage 6.0 6.5 5.5 8.0 8.5 max1615-03 supply voltage (v) supply current ( a) 25 20 15 10 7.5 7.0 t a = +85 c t a = +25 c t a = -40 c __________________________________________typic a l o pe ra t ing cha ra c t e rist ic s (v out set to 5v, t a = +25c, unless otherwise noted.) shdn input threshold voltage conditions v 0.25 v il units min typ max symbol parameter shdn input current v shdn = 0v or 15v a -1 1 thermal-shutdown temperature v shdn = 0v or 15v, hysteresis = +20c c 150 t shdn v ih 1.4 downloaded from: http:///
m ax 1 6 1 5 /m ax 1 6 1 6 h igh-volt a ge , low -pow e r line a r re gula t ors for n ot e book com put e rs 4 _______________________________________________________________________________________ 100 s/div load-transient response i out 30ma/div v out 50mv/div max1615-08 ____________________________typic a l ope ra t ing cha ra c t e rist ic s (c ont inue d) (v out set to 5v, t a = +25c, unless otherwise noted.) 0 10 20 30 40 50 60 70 80 90 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0 dropout supply current vs. supply voltage max1615-09 supply voltage (v) dropout supply current ( a) t a = +85 c t a = +25 c t a = 0 c t a = -40 c 0 0.05 0.10 0.15 0.20 0.25 0.30 0 5 10 15 20 25 30 35 40 dropout voltage vs. load current max1615-10 load current (ma) v in - v out (v) 50 s/div line-transient response +20v v out 50mv/div v in c out 4.7 f c in 10 f max1615-07 +10v 500 s/div tim e to exit shutdown +5v +5v out 0v shdn max1615-06 v in = 10v 0v 1.6 0 42 8 shutdown supply current vs. supply voltage 0.4 0.6 0.2 1.2 1.4 max1615-04 supply voltage (v) shutdown supply current ( a) 24 20 16 12 8 1.0 0.8 -70 0 0.01 100 ripple rejection vs. frequency -20 -30 -10 -50 -60 max1615-05 frequency (khz) ripple rejection (db) 10 1 0.1 -40 i load = 10ma downloaded from: http:///
_______________de t a ile d de sc ript ion the max1615/max1616 low-quiescent-current linear regulators are designed primarily for high input vo ltage applications. the max1615 supplies a preselected 3. 3v or 5.0v output for loads up to 30ma. the max1616 provides an adjustable voltage from 1.24v to 28v. t he maximum output current is a function of the package s maximum power dissipation for a given temperature. a 5a load is required to maintain output regulation. the max1615s output voltage is fed back through an internal resistor voltage divider connected to out. set the output voltage to either 3.3v or 5.0v with the 5/ 3 pin. select the 5v output by connecting 5/ 3 to out, or the 3.3v output by connecting 5/ 3 to gnd. the max1616 uses external feedback, allowing the ou t- put voltage to be set by external resistors (see setting the max1616 output voltage section). the typical fb threshold is at 1.24v. shut dow n the device enters shutdown mode when shdn is low. in shutdown mode, the pass transistor, control circ uit, reference, and all biases turn off, reducing the su pply current to below 1a. connect shdn to in for automatic start-up. curre nt lim it output current is limited to 100ma (typical). the c urrent limit exceeds the 30ma (max) safe operating limit. the output can be shorted to ground for 30 seconds with out damaging the part. t he rm a l-ove rloa d prot e c t ion when the junction temperature exceeds t j = +150c, the thermal sensor sends a signal to the shutdown logic, turning off the pass transistor and allowing the ic to cool. the thermal sensor turns the pass transist or on again after the ics junction temperature cools by +20c (typical), resulting in a pulsating output du ring continuous thermal-overload conditions. ope ra t ing re gion a nd pow e r dissipa t ion maximum power dissipation depends on the thermal resistance of the case and circuit board, the tempe ra- ture difference between the die junction and ambien t air, and the rate of air flow. the devices power d issipa- m ax 1 6 1 5 /m ax 1 6 1 6 h igh-volt a ge , low -pow e r line a r re gula t ors for n ot e book com put e rs _______________________________________________________________________________________ 5 ___________________________________________________ ___________pin de sc ript ion 1 in positive input voltage. connect to a +4v to +28v su pply. 2 gnd ground 4 5/ 3 preset output voltage select. connect to gnd for 3. 3v output or to out for 5.0v output. 5 shdn shutdown, active low input. connect to in for autom atic start up. current limit vref out gnd shdn 5/3 (max1615) fb (max1616) in max1615 max1616 figure 1. functional diagram 1 2 pin 5 name function max1615 max1616 3 out regulator output 3 fb feedback input. regulates to 1.24v nominally. 4 downloaded from: http:///
m ax 1 6 1 5 /m ax 1 6 1 6 h igh-volt a ge , low -pow e r line a r re gula t ors for n ot e book com put e rs 6 _______________________________________________________________________________________ ___________________chip i nform a t ion transistor count: 386 tion is p = i out (v in - v out ). the power dissipation at +70c ambient is 571mw (see absolute maximum ratings ). the thermal resistance junction-to-case of the sot23-5 package is 81c/w, and the maximum safe junction temperature is +150c. the gnd pin performs the dual function of providing an electrical connection to ground and channeling heat away. connect gnd to ground using a large pad or ground plane. __________applic a t ions i nform a t ion se t t ing t he m ax 1 6 1 6 out put v olt a ge set the max1616s output voltage with two resistors , r1 and r2 (figure 2). choose r2 = 250k ? to maintain a 5a minimum load and calculate r1 using the followi ng equation: where v fbt = 1.24v (typical). ca pa c it or se le c t ion use a 0.1f minimum capacitor on the input. higher values will improve line-transient response. use 1f minimum on the output, or 4.7f for the ful l 30ma load current (6.8f, max1616). otherwise, use 1f plus 0.125f/ma (0.2f/a, max1616). for output voltages less than 3.3v, use 15f instead of 6.8f. the output capacitors effective series resistance (esr ) must be less than 1 ? for stable operation. out put v olt a ge n oise the max1615/max1616 typically exhibit 5mvp-p of noise during normal operation. this is negligible i n most applications. in applications that include ana log- to-digital converters (adcs) of more than 12 bits, con- sider the adcs power-supply-rejection specificatio ns. t ra nsie nt re sponse the typical operating characteristics show the max1615/max1616s load-transient response. two of the output responses components can be observed on the load-transient graph: a dc shift from the outpu t impedance due to the different load currents, and t he transient response. typical step changes in the loa d current from 10ma to 20ma produce 50mv transients. increasing the output capacitors value attenuates tran- sient spikes. r1 = r2 v v out fbt ?? ? ?? ? 1 table 1. surface-mount capacitormanufacturers manufacturer capacitor sprague 593d, 595 series electrolytic avx tps series type matsuo 267 series ceramic avx x7r matsuo x7r table 2. component suppliers phone fax (803) 626-3123 (714) 960-6492 (603) 224-1430 avx (803) 946-0690 sprague supplier matsuo (714) 969-2491 (603) 224-1961 in out fb shdn gnd 6v to 28v 0.1 f 6.8 f* r1 r2 output voltage max1616 * 15 f for v out <3.3v figure 2. max1616 typical application circuit downloaded from: http:///
m ax 1 6 1 5 /m ax 1 6 1 6 h igh-volt a ge , low -pow e r line a r re gula t ors for n ot e book com put e rs _______________________________________________________________________________________ 7 __________________________________________________t a pe -a nd-re e l i nform a t ion p d e f w p 2 p 0 d 1 a 0 b 0 k 0 t 0.1020.102 a 0 b 0 dd 1 3.2003.099 1.499 0.991 0.1020.051 0.102 0.102 1.7533.505 1.397 3.988 ef k 0 p +0.102+0.000 note: dimensions are in mm.and follow eia481-1 standard. +0.305 -0.102 +0.254+0.000 p 0 3.988 0.102 p 0 10 40.005 0.203 p 2 2.007 0.051 t 0.254 0.127 w 8.001 5 sot23-5 downloaded from: http:///
m ax 1 6 1 5 /m ax 1 6 1 6 h igh-volt a ge , low -pow e r line a r re gula t ors for n ot e book com put e rs maxim cannot assume responsibility for use of any c ircuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the cir cuitry and specifications without notice at any tim e. 8 _____________________m a x im i nt e gra t e d produc t s, 1 2 0 sa n ga brie l drive , sunnyva le , ca 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0 ? 2004 maxim integrated products printed usa is a reg istered trademark of maxim integrated products. sot-23 5l .eps e 1 1 21-0057 package outline, sot-23, 5l pa c k a ge i nform a t ion (the package drawing(s) in this data sheet may not reflect the most current specifications. for the la test package outline information, go to www.maxim-ic.com/packages .) downloaded from: http:///
|
