advanced power electronics corp. features description ultra low dropout - 0.23v(typical) at 3a output current low esr output capacitor (multi-layer chip capacitors (mlcc)) applicable 0.8v reference voltage 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 esop-8 & tdfn 3x3-10l pb-free & halogen-free package. 1.using an output capacitor with esr > 20m ? 2.using an mlcc as the output capacitor (esop-8) data and specifications subject to change without notice 20130206v2.1 ape8963 3a ultra low dropout linear regulator typical application 1 the ape8963 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 fo r power conversion, to reduce power dissipation and provide extremely low dropout. the ape8963 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 ape8963 can be enabled by other power system. pulling and holding the en pin below 0.3v shuts off the output. the ape8963 is available in esop-8 and tdfn 3x3- 10l packages which features small size as an exposed pad to reduce the junction-to-case resistance, being applicable in 2~3w applications. c1 1uf r1 1k vout=1.2v/3 a vin=1.5v r3 1k vcntl=5v c4 220 uf c5 0.1u u1 ape 8963 vcntl fb vout gnd en pok vin c2 100 uf c3 0.1uf c6 12~48nf r2 2k off on vout vin=1.5v r3 10 k vout=1.2v/3a vfb = 0.8v u2 ape8963 vcntl fb vout gnd en pok vin c6 56pf c5 10uf c1 1uf c3 10uf vout=vfb x (1+r1/r2 ) vcntl =5v r2 78k r1 39k off on vout
advanced power electronics corp. ape8963 3.using an mlcc as the output capacitor (tdfn 3x3-10l) absolute maximum ratings (at t a =25c) vcntl supply voltage(v cntl ) ------------------------- - -0.3v to 7v vin supply voltage(v in ) --------------------------------- - -0.3v to 6v en and fb pin voltage(v i/o ) --------------------------- - -0.3v to v cntl +0.3v power good voltage(v pok ) ----------------------------- - -0.3v to 7v power dissipation(p d ) ----------------------------------- - esop-8 ------ - 2.5w tdfn 3x3-10l 2.2w storage temperature range(t st ) -------------------- - -65c to +150c junction temperature range(t j ) --------------------- - -40c to 125c operating temperature range (t op ) ---------------- - -40c to +85c thermal resistance from junction to case(rth jc ) esop-8 ------ - 15c/w tdfn 3x3-10l 15c/w esop-8 ------ - 40c/w tdfn 3x3-10l 45c/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 vcntl supply voltage(v cntl ) ------------------------- - 3v to 5.5v vin supply voltage(v in ) --------------------------------- - 1.2v to 3.65v output voltage(v out ) ------------------------------------- 0.8v to v in -v drop (v cntl - v out > 1.9v) output current(i out ) -------------------------------------- - 0 to 3a typical application 2 thermal resistance from junction to ambient(rth ja ) vin=1.5v r3 10k vout=1.2v/3a vfb = 0.8v u2 ape8963 tgn3 vcntl fb vout gnd en pok vin c6 56 pf c5 10 uf c1 1uf c3 10 uf vout= vfb x (1 +r1/r2) vcntl=5v r2 78 k r1 39 k off on vout vin
advanced power electronics corp. ape8963 ordering/package information electrical specifications (v cntl = 5v, v in = 1.5v, v out = 1.2v, t a =25c unless otherwise specified) parameter sym test condition min typ max units vcntl por threshold v cntl 2.5 2.7 2.9 v vcntl por hysteresis v cntl(hys) - 0.4 - v vin por threshold v in 0.8 0.9 1 v vin por hysteresis v in(hys) - 0.5 - v vcntl nominal supply current i cntl en= v cntl - 1 1.8 ma vcntl shuntdown current i sd en= 0v - 15 30 ua feedback voltage v fb v cntl =5v, i out =10ma 0.788 0.8 0.812 v load regulation i out =0a ~ 3a - 0.06 0.25 % v cntl = v en =5v v in = v out + 0.5v~5v i out =10ma dropout voltage v drop i out = 3a, v cntl =5v, v out =1.2v - 0.23 0.28 v vout pull low resistance en=0v - 85 - soft start time t ss -24ms v enh enable 1.2 - - v enl disable - - 0.4 en hysteresis -50-mv en pin pull-up current i en en=gnd - 10 - ua current limit i lim v cntl =3~5.5v, t j = -40 ~ 125c 3.3 - - a -65- -65- 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 4 ms thermal shutdown temp tsd - 160 - thermal shutdown hysteresis - 50 - en pin logic high threshold voltage v 0.1 %/v line regulation - 0.01 3 ripple rejection psrr f=120hz, i out =100ma db c vin vcntl ( top view ) 1 2 3 4 8 7 6 5 vout esop-8 en pok fb gnd vin vcntl vout exposed pad tdfn 3x3-10l fb 1 en 10 2 3 4 56 7 8 9 vin vin pok gnd vout vout nc (gnd) vcntl package type mp : esop-8 tgn3 : dfn 3x3-10l ape8963x
advanced power electronics corp. ape8963 pin descriptions pin symbol pin description gnd gnd pin fb feedback pin internal pull high. en=high or floating enable en=low shutdown mode vout output voltage pin pok power ok output pin vcntl cntl pin input voltage vin input voltage ep connect to vin or gnd block diagram function pin description fb 4 en connecting this pin to an external resistor divider receives the feedback voltage o f the regulator. the output voltage set by the resistor divider is determined by: - + vin vout gnd error amp en vcntl soft-start and control logic power -on reset current limit enable thermal shutdown bandgap fb -+ pok delay pok - + uv 0.4v 92% vref n-mosfet where r1 is connected from v out to fb with kelvin sensing and r2 is connected from fb to gnd. a bypass capacitor may be connected with r1in parallel to improve load transient response. the recommended r2 and r1 are in the range of 1k~100k .
advanced power electronics corp. ape8963 function pin description vin vcntl pok en vout function description power-on-reset internal soft-start output voltage regulation 5 main supply input pins for power conversions. the voltage at this pin is monitored for power-on reset purpose. 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 0.3v shuts down the output. when re-enabled, the ic undergoes a new soft-start cycle. left this pin open, this pin is internal pulled up to vcntl voltage, enabling the regulator. output of the regulator. please connect pin 3 and pin 4 using wide tracks. it is necessary to connect an output capacitor with this pin for closed-loop compensation and im p rovin g transient res p onses. a power-on-reset (por) circuit monitors both input voltages at v cntl and v in 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 v cntl 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 v in to v out .
advanced power electronics corp. ape8963 function description(cont.) current limit under-voltage protection (uvp) thermal shutdown 6 a thermal shutdown circuit limits the junction temperature of ape8963. when the j unction temperature exceeds +150 c, 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. the thermal shutdown designed. the ape8963 monitors the current via the output nmos and limits the maximum current to prevent load and ape8963 from damages during overload or short circuit conditions. the ape8963 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 ape8963 starts a new soft-start to regulate output.
advanced power electronics corp. ape8963 typical performance characteristics 7 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 33.544.555.5 v cntl vs i cntl v cntl (v) i cntl (ma) iout=0a 0.790 0.792 0.794 0.796 0.798 0.800 0.802 0.804 0.806 0.808 0.810 3 3.5 4 4.5 5 5.5 v cntl vs vfb v cntl (v) vfb (v) 0.785 0.790 0.795 0.800 0.805 0.810 0.815 0 0.5 1 1.5 2 2.5 3 iout vs vout iout (a) vout (v) v cn tl =5v, vin=1.5v 0 50 100 150 200 250 300 350 0 0.5 1 1.5 2 2.5 3 iout vs dropout iout (a) dropout (mv) vout=1.2v vout=1.8v vout=2.5v 0.75 0.76 0.77 0.78 0.79 0.80 0.81 0.82 0.83 0.84 0.85 -40 -25 0 25 50 75 100 125 temperaute vs vfb temperature() vfb(v) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 -40 -25 0 25 50 75 100 125 temperaute vs i cntl temperature() i cntl (ma)
advanced power electronics corp. ape8963 typical performance characteristics 8 enable-on power ok wave output discharge load transient
advanced power electronics corp. ape8963 marking information esop-8 tdfn 3x3-10l 9 8963mp ywwsss part numbe r date code (ywwsss) y last digit of the year ww week sss sequence package code 8963 ywwsss part numbe r date code (ywwsss) y last digit of the year ww week sss sequence
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