advanced power electronics corp. ultra low output voltage linear n-fet controller features description low esr output capacitor (mlcc and poscap) applicable 0.5v reference voltage with 2% accuracy internal soft-start enable control under-voltage short circuit protection fast transient response power ok output with a delay time adjustable output voltage down to 0.5v drive n-channel mosfets halogen free & rohs compliant APE8858 -hf data and specifications subject to change without notice 200905086 APE8858 typical application 1 ordering informatio n y : sot-26 package the APE8858 is an ultra low output voltage linear n- fet controller. this product is specifically designed to provide well supply voltage for front-side-bus termination on motherboards and nb applications. the APE8858 integrates many functions. a power-on-reset (por) circuit monitors supply voltages to prevent wrong operations. a pok indicates the output status with time delay which is set internally. it can control other converter for power sequence. the APE8858 can be enabled by other power system. a 0.5v reference voltage with 2% accuracy provide tight regulation of the output voltage, enable control, open drain power good signal, under-voltage protection and soft start. halogen free vout = 0.5v * (1 + ------ ) u1 APE8858 1 25 3 6 4 vcc gnd fb pok drv en vfb = 0.5v ; r2 range 1 ~ 100k c1 4.7uf vout=1.5v r2 r1 vcc=5v c2 10uf r2 10k r1 20k q1 mosfet n c3 0.1uf vin=1.8v 1000pf 10k www.datasheet.net/ datasheet pdf - http://www..co.kr/
advanced power electronics corp. APE8858 absolute maximum ratings (at t a =25c) vcc ??????????????????? ? -0.3v to 7v drv to gnd ???????????????? ? -0.3v to vcc+0.3v power dissipation (sot-26) ????????..... 0.4w storage temperature range ????????? ? -65 to 150c operating temperature range ???????? ? -40 to 85c junction temperature range ????????? -40 to 125c package information electrical specifications (v in =1.5v, v shdn =v in , t a =25 (top view) sot-26 3 2 6 4 1 gnd fb vcc drv 5 pok en www.datasheet.net/ datasheet pdf - http://www..co.kr/
advanced power electronics corp. APE8858 electrical specifications(cont.) parameter sym test condition min typ max units pok low voltage pok sinks 1ma - 50 100 mv pok delay time t delay 0.8 2 10 ms thermal shutdown temperature tsd - 150 - c thermal shutdown hysteresis - 50 - c pin descriptions pin symbol pin description fb feedback pin gnd common ground pin drv gate drive to n-fet pok power ok output pin h : normal operation l : shutdown vcc input voltage block diagram vfb pok threshold voltage for power not ok v pnok v fb falling 82% 85% 88% 3 en www.datasheet.net/ datasheet pdf - http://www..co.kr/
advanced power electronics corp. APE8858 function descriptions power-on-reset internal soft-start output voltage regulation under-voltage protection (uvp) thermal shutdown 4 a power-on-reset (por) circuit monitors input voltages at vcc pins to prevent wrong logic controls. the por function initiates a soft-start process after the supply voltages exceed the rising por threshold voltages during powering on. the por function also pulls low the pok pin regardless the output voltage when the vcc voltage falls below it?s fallin g por threshold. an internal soft-start function controls rise rate of the output voltage to limit the current surge at start-up. the typical soft-start interval is about 1ms. an error amplifier working with a temperature compensated 0.5v reference and an output nmos regulates output to the preset voltage. the error amplifier designed with high bandwidth and dc gain provides very fast transient response and less load re g ulation. APE8858 monitors the voltage on fb pin after soft-start process is finished. therefore the uvp is disabling during soft-start. when the voltage on fb pin falls below the under-voltage threshold, the uvp circuit shuts off the output immediately. after a while ( ~ 70% dut y ) , APE8858 starts a new soft-start to re g ulate output. a thermal shutdown circuit limits the junction temperature of APE8858. when the j unction temperature exceeds +150c, a thermal sensor turns off the output nmos, allowing the device to cool down. the regulator regulates the output again through initiation of a new soft-start cycle after the junction temperature cools by 50c, resulting in a pulsed output during continuous thermal overload conditions. www.datasheet.net/ datasheet pdf - http://www..co.kr/
tem p erature vs v fb 0.488 0.491 0.494 0.497 0.500 0 5 0 3 0.506 0.509 0.512 -40 -25 0 25 50 75 100 load regulation(v out ) 1.195 1.197 1.199 1.201 1.203 1.205 1.207 1.209 1.211 1.213 1.215 0 0.5 1 1.5 2 2.5 3 a d v a n ced p o w e r electr o n i cs c o r p . APE8858 vfb (v) vout (v) www.datasheet.net/ datasheet pdf - http://www..co.kr/
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 roxxx part number : ro d date code : xxx c b l l g e j i a h 6 www.datasheet.net/ datasheet pdf - http://www..co.kr/
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