advanced power electronics corp. features description output voltage : adjustable output version. adjustable version output voltage range : 0.745v to 24v. 200khz fixed switching frequency. thermal-shutdown and current-limit protection. on/off shutdown control input. short circuit protect (scp). operating voltage can be up to 26v. output load current : 1a. low power standby mode. built-in switching transistor on chip. sot-23-5l and so-8 packages. table 1 resistor select for output voltage setting v out r2 r1 5v 1.2k 6.8k 3.3v 2.4k 8.2k 2.5v 2k 4.7k 1.8v 3.3k 4.7k 1.5v 2k 2k 1.3v 2k 1.5k 1.2v 2k 1.2k v out l1 value data and specifications subject to change without notice 5v 33uh 33uh 47uh 47uh 200812231 APE1723 typical application 1 200khz, 1a pwm buck dc/dc converter l1 recommend value (v in =12v, i out =1a) 1.8v 2.5v 3.3v the APE1723 series are monolithic ic designed for a step-down dc/dc converter, and own the ability of driving a 1a load without additional transistor. it saves board space. the external shutdown function can be controlled by logic level and then come into standby mode. the internal compensation makes feedback control having good line and load regulation without external design. regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is against over current operating of the output switch. if the APE1723?s vfb is down below 0.5v, the switching frequency will be reduced. the APE1723 operates at a switching frequency of 200khz thus allow smaller sized filter components. other features include a guaranteed +3% tolerance on output voltage under specified input voltage and output load conditions, the chips are available in sot-23-5l and so-8 packages. v out = v fb x (1+r1/r2) , v fb = 0.745v, r2 = 0.75k ~4 k c2 0.1uf d1 b140a l1 c3 220uf c1 100uf u1 APE1723 5 1 3 4 2 vin sw fb en vss vout=5v/1a vin=12v on/off c6 0.1uf r2 1.2k r1 6.8k c4 0.1uf r3 100k (refer table)
advanced power electronics corp. APE1723 absolute maximum ratings (at t a =25c) maximum supply voltage(v in ) ------------------------- - +30v feedback pin voltage(v fb ) ----------------------------- -0.3v to 12v on/off pin voltage(v en ) ------------------------------ - -0.3v to v in output voltage to ground(v out ) ----------------------- - -0.8v power dissipation(p d ) ------------------------------------ - (t j -t a )/rth ja w storage temperature range(t st ) --------------------- -65c to 150c operating junction temperature range(t opj ) ----- -40c to 125c operating supply voltage(v op ) ------------------------ - +4.5v to 26v thermal resistance from junction to case(rth jc ) so-8 50c/w sot-23-5l 180c/w so-8 120c/w sot-23-5l 250c/w note. rth ja is measured with the pcb copper area(need connect to v ss pins) of approx. 1.5 in 2 (multi-layers) ordering/package information electrical specifications (v cc =12v, v out =3.3v, i load =0.3a, t a =25c, unless otherwise specified) parameter sym test condition min typ max units feedback voltage v fb i out =0.3a 0.723 0.745 0.767 v quiescent current i q v fb =1.2v force driver off - 3.5 6 ma feedback bias current i fb i out =0.1a - -10 -50 na shutdown supply current i sd v en =0v - 2 10 ua oscillator frequency f osc 140 200 260 khz oscillator frequency of short circuit protect f scp (adjustable) when v fb <0.5v - 50 - khz max. duty cycle (on) v fb =1.2v force driver off - 0 - min. duty cycle (off) v fb =0v force driver on - 100 - pear current, no outside circuit v fb =0v force driver on i out =1a, no outside circuit v fb =0v force driver on saturation voltage v sa t - 1.2 -a 1.5 v 2 thermal resistance from junction to ambient(rth ja ) dc % current limit i limit 1.2 - (top view) sot-23-5l 3 2 5 4 1 sw vss fb en vin ( top view ) 1 2 3 4 8 7 6 5 vin nc so-8 vss sw fb nc nc en package type y5 : sot-23-5l m : so-8 APE1723x
advanced power electronics corp. APE1723 electrical specifications(cont.) parameter sym test condition min typ max units sw pin=0v v in =26v, no outside circuit - - -200 ua sw pin=-0.8v v fb =1.0v force driver off - -5 - ma v ih high (regulator on) - 2 v il low (regulator off) 0.5 - en pin logic input current i h v en =2.5v (on) -20- en pin input current i l v en =0.3v (off) --5- thermal shutdown temp tsd - 145 - c pin descriptions pin symbol pin description v ss gnd pin fb feedback pin power -off pin h : normal operation(step-down) l : step-down operation stopped (all circuits deactivated) sw switch output v in operating voltage input nc no connect pin block diagram 3 en v i swl en pin logic input threshold voltage - ua sw pin leakage current osc. start up + + _ + _ thermal shutdown control + driver comp. comp. vss sw en fb 200mv 220mv _ comp. vin current limit + _ amp comp. current source bias 0.745v reference 2.5v regulator
advanced power electronics corp. APE1723 function pin description pin functions vin vss sw fb en 4 this is the positive input supply for the ic switching regulator. a suitable input bypass capacitor must be presented at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. circuit ground. internal switch. the voltage at this pin switches between (+vin ? vsat) and approximately ? 0.5v, with a duty cycle of approximately vout / vin. to minimize coupling to sensitive circuitry, the pc board copper area connected to this pin should be minimized. senses the regulated output voltage to complete the feedback loop. allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 10ua. pulling this pin below a threshold voltage of approximately 0.5v shuts the regulator down, and pulling this pin above 2.0v (up to a maximum of vin) turns the regulator on.
advanced power electronics corp. APE1723 typical performance characteristics 5 iout vs vfb (vin=12v) 0.73 0.735 0.74 0.745 0.75 0.755 0.76 100 300 500 800 1000 1200 0.73 0.735 0.74 0.745 0.75 0.755 0.76 -40 -20 0 25 50 85 105 125 2 2.4 2.8 3.2 3.6 4 4.4 4.5v 8v 12v 16v 20v 24v 26v 2 2.4 2.8 3.2 3.6 4 4.4 -40 -20 0 25 50 85 105 125 140 160 180 200 220 240 260 4.5v 8v 12v 16v 20v 24v 26v 140 160 180 200 220 240 260 -40-200 255085105125
advanced power electronics corp. APE1723 typical performance characteristics 6 vin vs fscp 45 47 49 51 53 55 57 59 4.5v 8v 12v 16v 20v 24v 26v 0 10 20 30 40 50 60 70 80 -40 -20 0 25 50 85 105 125 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 4.5v 8v 12v 16v 20v 24v 26v 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 -40-200255085105125 0.4 0.6 0.8 1 1.2 1.4 1.6 100 300 500 800 1000 1200 0 1 2 3 4 5 6 -40 -20 0 25 50 85 105 125
advanced power electronics corp. APE1723 typical performance characteristics 7 output ripple (12v 70.00% 74.00% 78.00% 82.00% 86.00% 90.00% 200 500 800 1000 70.00% 74.00% 78.00% 82.00% 86.00% 90.00% 200 500 800 1000
advanced power electronics corp. APE1723 typical performance characteristics 8 load transient (24v
package outline : sot-23-5l min nom max a 1.00 1.10 1.30 a1 0.00 --- 0.10 a2 0.70 0.80 0.90 b 0.30 0.40 0.50 c 0.10 0.15 0.25 d 2.70 2.90 3.10 e 1.40 1.60 1.80 e --- 1.90(typ) --- h 2.60 2.80 3.00 l 0.37 --- --- 10 5 9 e1 --- 0.95(typ) --- note 1 package body sizes exclude mold flash protrusions or gate burrs. note 2 tolerance 0.1000 mm(4mil) unless otherwise spe- cified. note 3 coplanarity 0.1000 mm note 4 dimension l is measured in gage plane. part marking information & packing : sot-23-5l advanced power electronics corp. symbols millimeters xxyw part number : n1 weak : (01~26) a~z 9 (27~52) a~z year ---- 8 : 2008 a : 2010
millimeters symbols min nom max a 1.35 1.55 1.75 a1 0.10 0.18 0.25 b 0.33 0.41 0.51 c 0.19 0.22 0.25 d 4.80 4.90 5.00 e 5.80 6.15 6.50 e1 3.80 3.90 4.00 e g l 0.38 0.90 0.00 4.00 8.00 1.all dimension are in millimeters. 2.dimension does not include mold protrusions. part marking information & packing : so-8 1.27 typ 0.254 typ package outline : so-8 advanced power electronics corp. e b 1 34 5 6 7 8 2 d e1 a1 a g part number 1723 m ywwsss package code date code (ywwsss) y last digit of the year ww week sss sequence e
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