advanced power electronics corp. 3a ultra low dropout linear regulator features description ultra low dropout 0.23v(typical) @ 2a output current for 1.2v output voltage low esr output capacitor (multi-layer chip capacitors (mlcc)) applicable en pull-low for APE8903Bmp-a en pull-high for APE8903Bmp-b fast transient response adjustable output voltage by external resistors power-on-reset monitoring on both vcntl and vin pins internal soft-start under-voltage protection current-limit and thermal shutdown protection power-ok output with a delay time so-8 with exposed pad pb-free package. halogen free product 1. using an output capacitor with esr R 20m data and specifications subject to change without notice 201009151 APE8903B typical application 1 the APE8903B series is a 3a ultra low dropout linear regulator. this product is specifically designed to provide well supply voltage for front-side-bus termination on motherboards and nb applications. the ic needs two supply voltages, a control voltage for the circuitry and a main supply voltage for power conversion, to reduce power dissipation and provide extremely low dropout. the APE8903B series integrates many functions. a power-on-reset (por) circuit monitors both supply voltages to prevent wrong operations. a thermal shutdown and current limit functions protect the device against thermal and current over-loads. a pok indicates the output status with time delay which is set internally. it can control other converter for power sequence. the APE8903B series can be enabled by other power system. pulling and holding the en pin below 0.4v shuts off the output. the APE8903B series is available in esop-8 package which features small size as so-8 and an exposed pad to reduce the junction-to-case resistance, being applicable in 2~3w applications. c1 1uf r1 1k vout=1.2v/2a vin=1.8v r3 vcntl=5v c4 220uf c5 0.1u u1 APE8903B vcntl fb vout gnd nc en pok vin c2 100uf c3 0.1uf c6 12~48nf r2 2k off on 10k
advanced power electronics corp. APE8903B 2. using an mlcc as the output capacitor absolute maximum ratings (note1) cntl supply voltage (v cntl ) -------------------------- - -0.3v to 6.5v input supply voltage (v in ) ------------------------------- - -0.3v to 6.5v en & fb pin voltage (v en /v fb ) ------------------------ - -0.3v to vcntl+0.3v power good voltage (v pok ) ---------------------------- - -0.3v to 6.5v power dissipation (p d ) ---------------------------------- - 2.5w storage temperature range (t st ) -------------------- - -65c to 150c junction temperature range (t j ) --------------------- -40c to 150c thermal resistance junction to ambient (rth ja ) note 40c/w thermal resistance junction to case (rth jc ) ------ - 15c/w note. rth ja is measured with the pcb copper area (need connect to expose-pad) of approximately 1.5 in 2 (multi-layer) recommended operating conditions operating junction temperature range (t oj ) ----- - -40c to 125c operating ambient temperature range (t oa ) ----- - -40c to 85c vcntl supply voltage (v cntl ) ------------------------ - 3v to 6v input supply voltage (v in ) ------------------------------- - 1.1v to 5.5v output voltage (v out )@v cntl =5v -------------------- - 0.8v to 2.8v output cunrrent (i out ) ------------------------------------ - 0a to 3a package/ordering information 2 typical application ( top view ) 1 2 3 4 8 7 6 5 nc vout esop-8 gnd fb en pok vin vcntl gnd vin=1.8v r3 10k vout=1.2v/2a vfb = 0.8v u2 APE8903B vcntl fb vout gnd nc en pok vin c6 56pf c5 10uf c1 1uf c3 4.7uf vout=vfb x (1+r1/r2) vcntl=5v r2 78k r1 39k off on package type mp : esop-8 APE8903Bx-x - hf en function a : pull low b : pull high halogen free
advanced power electronics corp. APE8903B electrical specifications v cntl = 5v, v in =1.8v, v out =1.2v, t a =25 o c unless otherwise specified parameter sym test condition min typ max units v cntl por threshold v cntl 2.5 2.7 2.9 v v cntl por hysteresis v cntl(hys) - 0.4 - v v in por threshold v in 0.8 0.9 1 v v in por hysteresis v in(hys) - 0.5 - v v cntl nominal supply current i cntl en= v cntl 0.4 1 1.5 ma APE8903Bmp-a - - 1 APE8903Bmp-b - 10 30 v cntl =3 ~ 6v, i out =10ma, v in =v out +0.5~5.5v load regulation i out =0a ~ 2a - 0.2 1 % i out =100ma, v cntl =v en =5.0v, v out =1.2v dropout voltage v drop i out = 2a, v cntl =5v, v out = 1.2v - 0.23 0.3 v v out pull low resistance en=0v - 90 - soft start time t ss -2-ms v enh enable 1.2 - - v enl disable - - 0.6 en hysteresis -40-mv en=5v, APE8903Bmp-a - 10 20 en=gnd, APE8903Bmp-b - 10 20 current limit i lim v cntl =5v, v in =v out +1v 3.1 - - a -65- -65- v cntl =5v, c out =10uf, en startup, i out =2a under-voltage threshold vfb falling - 0.4 - v pok threshold voltage for power ok v pok vfb rising 89% 92% 95% vfb pok threshold voltage for power not ok v pnok vfb falling 78% 81% 84% vfb pok low voltage pok sinks 5ma - 0.25 0.4 v pok delay time t delay 0.8 2 10 ms thermal shutdown temp tsd - 160 - o c thermal shutdown hysteresis - 40 - o c 3 v 0.816 v 150 m ? f=120hz, i out =100ma db ua 0.784 - 115 0.8 v fb ripple rejection psrr en pin pull-up current i en en pin logic high threshold voltage on resistance r ds(on) vcntl shutdown current i sd ua inrush current - 0.5 - a feedback voltage v in v cntl en=0v
advanced power electronics corp. APE8903B pin descriptions pin symbol pin description pok power ok output pin internal pull high (APE8903Bmp-b) or pull low (APE8903Bmp-a) en=high or floating enable en=low shutdown mode vin input voltage. vcntl cntl pin input voltage nc no connect vout output voltage fb feedback pin gnd gnd pin block diagram APE8903Bmp-a APE8903Bmp-b 4 en - + vin vout gnd error amp en vcntl soft-start and control logic power -on reset current limit thermal shutdown bandgap fb -+ pok delay pok - + uv 0.4v 92% v ref n-mosfet 10ua enable - + vin vout gnd error amp en vcntl soft-start and control logic power -on reset current limit thermal shutdown bandgap fb -+ pok delay pok - + uv 0.4v 92% v ref n-mosfet 10ua enable
advanced power electronics corp. APE8903B pin description fb vin vcntl pok en vout function description power-on-reset internal soft-start output voltage regulation current-limit 5 connecting this pin to an external resistor divider receives the feedback voltage of the regulator. the output voltage set by the resistor divider is determined by: a power-on-reset (por) circuit monitors both input voltages at vcntl and vin pins to prevent wrong logic controls. the por function initiates a soft-start process after the two supply voltages exceed their rising por threshold voltages during powering on. the por function also pulls low the pok pin regardless the output voltage when the vcntl voltage falls below its falling 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 2ms. an error amplifier working with a temperature compensated 0.8v 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 regulation. it compares the reference with the feedback voltage and amplifies the difference to drive the output nmos which provides load current from vin to vout. where r1 is connected from vout to fb with kelvin sensing and r2 is connected from fb to gnd. a bypass capacitor may be connected with r1 in parallel to improve load transient response. the r2 range in 1k~4.7k for al output capacitor and 30k~100k for mlcc output capacitor are recommended. power input pin of the control circuitry. connecting this pin to a +5v (recommended) supply voltage provides the bias for the control circuitry. the voltage at this pin is monitored for power-on reset purpose. power-ok signal output pin. this pin is an open-drain output used to indicate status of output voltage by sensing fb voltage. this pin is pulled low when the rising fb voltage is not above the vpok threshold or the falling fb voltage is below the vpok threshold, indicating the output is not ok. enable control pin. pulling and holding this pin below 0.4v shuts down the output. when re- enabled, the ic undergoes a new soft-start cycle. for APE8903Bmp-b, this pin is internal pulled up to vcntl voltage, enabling the regulator. for APE8903Bmp-a, this pin is internal pulled down to gnd voltage, shutdown the regulator. the pull-high or pull-low current is 10ua (typ.) output of the regulator. please connect pin 6 using wide tracks. it is necessary to connect an output capacitor with this pin for closed-loop compensation and improving transient responses. the APE8903B monitors the current via the output nmos and limits the maximum current to prevent load and APE8903B from damages during overload or short circuit conditions. main supply input pins for power conversions. the voltage at this pin is monitored for power- on reset purpose.
advanced power electronics corp. APE8903B function description under-voltage protection (uvp) thermal shutdown application information capacitor selection 6 the APE8903B 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, the APE8903B starts a new soft-start to regulate output. a thermal shutdown circuit limits the junction temperature of APE8903B. when the junction temperature exceeds +160c, 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 40c, resulting in a pulsed output during continuous thermal overload conditions. the thermal shutdown designed. normally, use a mlcc capacitor on the input and output of the APE8903B. larger input capacitor values provide better supply-noise rejection and transient response. a higher- value output capacitor may be necessary if large, fast transients are anticipated and the device is located several inches from the power source. the x5r and x7r type in mlcc is recommended. for aluminum electrolytic capacitor application, 100uf in input capacitor and 220uf in output capacitor (30m
advanced power electronics corp. APE8903B typical performance characteristics 7 0.780 0.785 0.790 0.795 0.800 0.805 0.810 0.815 0.820 3 3.5 4 4.5 5 5.5 6 v cntl (v) v fb (v) line regulation v in =1.8v, v out =1.2v i out =10ma 0.780 0.785 0.790 0.795 0.800 0.805 0.810 0.815 0.820 00.511.522.53 iout (a) v fb (v) load regulation v cn tl =5v, v in =1.8v, v out =1.2v 0 100 200 300 400 500 600 700 800 00.511.522.53 iout (a) dropout voltage (mv) dropout voltage (v cntl =3.3v) v out =1.2v v out =1.5v 0 100 200 300 400 500 600 00.511.522.53 iout (a) dropout voltage (mv) dropout voltage (v cntl =5v) v out =1.2v v out =2.5v v out =1.8v 0.780 0.785 0.790 0.795 0.800 0.805 0.810 0.815 0.820 -40 -20 0 25 50 75 100 125 temperature () v fb (v) temperature vs v fb v cntl =5v, v in =1.8v, v out =1.2v, i out =10ma 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 -40 -20 0 25 50 75 100 125 tem p erature ( ) i cntl (ma) temperature vs quiescent current v cntl =5v, v in =1.8v, v out =1.2v, i out =0a
advanced power electronics corp. APE8903B typical performance characteristics 8 load transient vcntl power ?on line transient line transient 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 -40 -20 0 25 50 75 100 125 temperature () enable threshold voltage (v) temperature vs enable threshold voltage v cntl =5v v enh v enl 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 -40 -20 0 25 50 75 100 125 temperature () v cntl por threshold voltage (v) temperature vs v cntl por threshold rising falling
advanced power electronics corp. APE8903B typical performance characteristics vin power ?on enable ?on with pok delay 9
package outline : esop-8 millimeters symbols min nom max a 5.80 6.00 6.20 b 4.80 4.90 5.00 c 3.80 3.90 4.00 d 048 e 0.40 0.65 0.90 f 0.19 0.22 0.25 m 0.00 0.08 0.15 0.35 0.42 0.49 l 1.35 1.55 1.75 j k g p 2.15 2.25 2.35 q 2.15 2.25 2.35 1.all dimension are in millimeters. 2.dimension does not include mold protrusions. part marking information & packing : esop-8 draw no. m1-mp-8-g-v01 0.375 ref. 45 1.27 typ. advanced power electronics corp. h j l 8903 b mp -x ywwsss en function part number date code (ywwsss) y last digit of the year ww week sss sequence b a2 i q p package code
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