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1 / 12 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 jul . 0 7 20 10 ax661 6 3a ultra low dropout linear regulator ? general description the AX6616 is a 3a ultra low dropout linear regulator. this product is specifically designed to provide well supply vol tage 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 AX6616 integrates many functions. a power - on - reset (por) circuit monito rs 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 c onverter for power sequence. the AX6616 can be enabled by other power system. pulling and holding the en pin below 0.3v shuts off the output. the AX6616 is available in sop - 8l - ep and t dfn - 10l package s which features small size as an exposed pad to red uce the junction - to - case resistance, being applicable in 2~3w applications. ? features - ultra low dropout - 0. 2 3 v(typical) at 3a output current - low esr output capacitor (multi - layer chip capacitors (mlcc)) applicable - 0.8v reference voltage - fast transient re sponse - 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 - sop - 8l - ep and t dfn - 10l (3mm*3mm) pb - free package.
2 / 12 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 jul . 0 7 20 10 ax661 6 ? b lock d iagram ? pin assignment the package s of AX6616 are sop - 8l - ep and t dfn - 10l ; the pin assignment is given by : name description gnd gnd pin fb feedback pin v out output voltage supply pin en internal pull high. en=high or floating ? ? pok power ok output pin vcntl cntl pin input voltage vin input voltage ep connect to gnd - + 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 . 4 v 92 % vref n - mosfet ( top view ) 1 2 3 4 8 7 6 5 vout sop - 8 l - ep ax en pok fb gnd vin vcntl ep vout ( gnd ) t d f n - 1 0 l ( 3 * 3 ) f b 1 e n 1 0 2 3 4 5 6 7 8 9 v i n v i n p o k g n d v o u t v o u t n c ( g n d ) v c n t l
3 / 12 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 jul . 0 7 20 10 ax661 6 ? order/marking in formation order information top marking ( sop - 8l - ep ) top marking ( t dfn - 10l) ? a boslute m aximum r atings (at t a =25 c ) characteristics symbol rating unit vcntl supply voltage v cntl - 0.3 to 7 v vin supply voltage v in - 0.3 to 7 v en and fb pin voltage v i/o - 0.3 to v cntl +0.3 v power good voltage v pok - 0.3 to 7 v power dissipation pd ( t j - t a ) / ja w storage temperature range t st - 65 to +150 c junction temperature range t j - 40 to 125 c operating temperature range t op - 4 0 to +85 c thermal resistance from junction to case sop - 8 l - ep jc 15 , c / w t dfn - 10 l 20 thermal resistance from junction to ambient sop - 8 l - ep ja 40 c /w t dfn - 10 l 45 note: ja is measured with the pcb copper area (need connect to expose - pad ) of approximately 1.5 in 2 (multi - layer) ? r ecommended o perating c onditions characteristics symbol conditions rating unit vcntl supply volta ge v cntl 3 to 6 v vin supply voltage v in i out =1a 1.0 to 6 v output voltage v out v cntl - v out >1. 4 v 0.8 to v in - v drop v output current i out 0 to 3 a package type ax 6616 xxx x packing blank : tube a : taping es : sop - 8 l - ep j 10 : tdfn - 10 l ( 3 * 3 ) y ax 6 part number id code : internal ww : 01 ~ 52 year : 10 = 2010 11 = 2011 6 1 6 y w w x logo 6 part number id code : internal ww : 01 ~ 52 year : 10 = 2010 11 = 2011 y y w w x 6 1 6
4 / 12 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 jul . 0 7 20 10 ax661 6 ? e lectrical c haracteristics ( v cntl = 5v, v in = 1.5v, v out = 1.2v , t a =25 c unless otherwise specified ) characteristics symbol conditions 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 1.0 v vin por hysteresis v in(hys) - 0.5 - v vcntl nominal supply current i cntl e n= v cntl - 1 1.8 ma vcntl shuntdown current i sd en= 0v - 50 100 ua feedback voltage v fb v cntl = 3.0 ~ 6 v i out =10ma 0.784 0.8 0.816 v load regulation i out =0a ~ 3a - 0.06 0.25 % dropout voltage v drop i out = 3a v cntl =5v 1.2v out Q out Q out ss - 2 4 ms en pin l ogic high threshold voltage v enh enable 1.2 - - v v enl disable - - 0.4 en hysteresis - 50 - mv en pin pull - up c urrent i en en=gnd - 10 - ua current limit i lim v cntl = 3~6 v t j = - 40 ~ 125 c 3.3 - - a ripple rejection vin psrr f=120hz, i out =100ma - 65 - db vcntl - 65 - under - voltage threshold vfb falling - 0.4 - v pok threshold voltage for power ok v pok vfb ri sing 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 t sd - 160 - c thermal shutdown hysteresis t sh - 50 - c
5 / 12 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 jul . 0 7 20 10 ax661 6 ? a pplication c ircuit 1. using an output capacitor with es r R 20m 2. using an mlcc as the output capacitor sop - 8l - ep t dfn - 10l c 1 1 uf r 1 1 k vout = 1 . 2 v / 3 a vin = 1 . 5 v r 3 1 k vcntl = 5 v c 4 220 uf c 5 0 . 1 u u 1 ax 6616 es 6 2 4 1 3 8 7 5 vcntl fb vout gnd en pok vin c 2 100 uf c 3 0 . 1 uf c 6 12 ~ 48 nf r 2 2 k off on vout vin = 1 . 5 v r 3 10 k vfb = 0 . 8 v u 2 ax 6616 es 6 2 4 1 3 8 7 5 vcntl fb vout gnd en pok vin c 6 56 pf c 5 10 uf c 1 1 uf c 3 10 uf vout = vfb *( 1 + r 1 / r 2 ) vcntl = 5 v r 2 78 k r 1 39 k off on vout vin = 1 . 5 v r 3 10 k vout = 1 . 2 v / 3 a vfb = 0 . 8 v u 2 ax 6616 z 1 3 7 9 6 8 5 4 1 vcntl fb vout gnd en pok vin c 6 56 pf c 5 10 uf c 1 1 uf c 3 10 uf vout = vfb *( 1 + r 1 / r 2 ) vcntl = 5 v r 2 78 k r 1 39 k off on vout 2 vin
6 / 12 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 jul . 0 7 20 10 ax661 6 ? f unction p in d escriptions fb 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 b y: 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 r1in parallel to improve load transient response. the recommended r 2 and r1 are in the range of 1 k ~10 0k . vin main supply input pins for power conversions . the voltage at this pin is monitored for power - on reset purpose. vcntl 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. pok 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. en 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.
7 / 12 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 jul . 0 7 20 10 ax661 6 vout 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 improving transient responses. ? f unction d escriptions power - on - reset 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 po r threshold. internal soft - start 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 2 ms. output voltage regulation an error amplifier worki ng 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 referen ce with the feedback voltage and amplifies the difference to drive the output nmos which provides load current from vin to vout. current - limit the AX6616 monitors the current via the output nmos and limits the maximum current to prevent load and ax6 616 from damages during overload or short circuit conditions.
8 / 12 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 jul . 0 7 20 10 ax661 6 under - voltage protection (uvp) the AX6616 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 p in falls below the under - voltage threshold, the uvp circuit shuts off the output immediately. after a while, the AX6616 starts a new soft - start to regulate output. thermal shutdown a thermal shutdown circuit limits the junction temperature of AX6616 . when the junction 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. the thermal shutdown designed .
9 / 12 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 jul . 0 7 20 10 ax661 6 ? t ypical c haracteristics 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 3 3.5 4 4.5 5 5.5 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 cntl =5v, vin=1.5v 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)
10 / 12 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 jul . 0 7 20 10 ax661 6 ? typical characteristics (c ontinuous ) enable - on power ok wave output discharge load transient
11 / 12 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 jul . 0 7 20 10 ax661 6 ? p ackage o utlines (1) sop - 8l - ep symbol dimensions in millimeters dimensions in inches min. nom. max. min. nom. max. a - - 1.75 - - 0.069 a1 0 - 0.15 0 - 0.06 a2 1.25 - - 0.049 - - c 0.1 0.2 0.25 0.0075 0.008 0.01 d 4.7 4.9 5.1 0.185 0.193 0.2 e 3.7 3.9 4.1 0.146 0.154 0.161 h 5.8 6 6.2 0.228 0.236 0.244 l 0.4 - 1.27 0.015 - 0.05 b 0.31 0.41 0.51 0.012 0.016 0.02 e 1.27 bsc 0.050 bsc y - - 0.1 - - 0.004 x - 2.34 - - 0.092 - y - 2. 34 - - 0.092 - 0 o - 8 o 0 o - 8 o mold flash shall not exceed 0.25mm per side jedec outline: ms - 012 ba detail a l h e a a 2 a 1 e d 7 ( 4 x ) b y c detail a y x expose pad
12 / 12 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 jul . 0 7 20 10 ax661 6 (2) t dfn - 10l (3*3 0.75mm) symbol dimensions i n millimeters dimensions i n inches min. nom. max. min. nom. max. a 0.7 0 0.75 0.80 0.028 0.030 0.031 a1 0.00 0.02 0.05 0.000 0.001 0.002 a3 0.20 ref . 0.008 ref . b 0.18 0.25 0.30 0.007 0.010 0.012 d 2.90 3.00 3.10 0.114 0.118 0.122 d2 2. 2 0 2.40 2.50 0.0 87 0.094 0.098 e 2.90 3.00 3.10 0.114 0.118 0.122 e2 1.50 1.60 1.70 0.059 0.063 0.070 e 0.50 bsc . 0.020 bsc . l 0.30 0.40 0.50 0.012 0.016 0.020 e d a a 1 a 3 d 2 e e 2 l ( t o p v i e w ) ( b o t t o m v i e w ) b p i n 1 s e a t i n g p l a n e ( s i d e v i e w )

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