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1/ 11 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 27 , 2010 AX6640 low noise cmos triple ldo s regulato r ? general description the AX6640 is a three channel, high accurately, low quiescent current, low noise, low dropout cmos ldo regulator. t he regulator performance is optimized for battery - powered systems to deliver ultra low noise and low quiescent current. regulator ground current increases only slightly in dropout, further prolonging the battery life. the ax66 40 has the soft start function to suppress the inrush current . built - in current - limit and thermal shutdown functi ons prevent any fault condition from ic damage. the ax66 40 is fully compatible with low esr ceramic capacitors, reducing cost and improving output stability. this high level output stability is maintained even during frequent load fluctuations, due to the excellent transient response performance and high psrr achieved across a broad range of frequency. it is available in the tsot-23-6l package. ? features - input voltage range : 3.0 v to 5.5 v - operating output voltage type : channel 1 output voltage: 1.8v, 2.8v an d 3.3v c hannel 2 output voltage: 2.8v and 3.3v channel 3 output voltage: 2.8v and 3.3v - 1 0 0 mv dropout at 100m a output current ( v out = 3.3 v) - output current is up to 150ma/each channel - low quiescent current 90 a (typ.) - fast transient response - current limit prot ection - t hermal shutdown protection - low esr capacitor compatible - available in the 6 - pin pb - free t sot - 23 p ackage v?mw`r?y?b? www.gofotech.com
2/ 11 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 27 , 20 10 AX6640 ? b lock d iagram ? pin assignment the package of ax 6640 is t sot - 23- 6 l ; the pin assignment is given by : name description vin power input gnd ground en enable control pin, pull low shutdown vout1 and vout2 vout1 output1 voltage vout2 output2 voltage vout3 output3 voltage current limit 1 - + vin vout 1 gnd error amp bandgap thermal shutdown vout 3 current limit 2 - + error amp enable / shutdown en vout 2 current limit 3 - + error amp en 1 delay ( t o p v i e w ) t s o t - 2 3 - 6 l 3 2 6 4 1 v i n g n d v o u t 3 v o u t 1 5 e n v o u t 2 v?mw`r?y?b? www.gofotech.com
3/ 11 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 27 , 20 10 AX6640 ? order/marking information order information top marking appendix part number identification code AX6640ac t a ma AX6640bc t a mf AX6640cc t a mg AX6640dc t a mh AX6640ec t a mk ? absolute maximum ratings ( at t a =2 5 c) characteristics symbol rating unit v in pin voltage v in gnd - 0.3 to gnd + 6 .5 v output voltage v out 1 /v out2 /v out3 gnd - 0.3 to v in + 0.3 v enable voltage en gnd - 0.3 to v in + 0.3 v power dissipation pd ( t j - t a ) / ja mw storage temperature range i s d - 65 to +150 c operating junction temperature range t op j - 4 0 to + 125 c junction temperature t j - 4 0 to +150 c thermal resistance from junction to case jc 18 0 c /w thermal resistance from junction to ambient ja 250 c /w note: ja is measured wi th the pcb copper area of approximately 1 in 2 (multi - layer). that need connect to gnd pin . ax 6640 x x x ct : tsot 23 - 6 l output type package packing a : taping ( refer table ) x output type code : ( v out 1 + v out 2 + v out 3 ) a : 1 . 8 v + 2 . 8 v + 2 . 8 v b : 2 . 8 v + 2 . 8 v + 2 . 8 v c : 1 . 8 v + 3 . 3 v + 2 . 8 v d : 3 . 3 v + 2 . 8 v + 2 . 8 v e : 1 . 8 v + 2 . 8 v + 3 . 3 v l identification code week : 01 ~ 26 ( a ~ z ) 27 ~ 52 ( a ~ z ) year : 7 = 2007 a = 2010 id code : internal l y w x v?mw`r?y?b? www.gofotech.com
4/ 11 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 27 , 20 10 AX6640 ? electrical characteristics (v in = 5v, t a =25 c , unless otherwise noted) characteristics symbol conditions min typ max units input voltage v in (note 1) i out =30ma 3 - 5.5 v output voltage accuracy v out i out 1,2,3 =1ma - 2 - +2 % output voltage temperature coefficient i out =30ma (note 4) - 100 - ppm/oc supply current i cc i out 1,2,3 =0ma, v in =5v - 90 120 a shutdown current i sd en=0v , i out3 =0ma, v in =5v - 4 0 7 0 a dropout voltage v drop i out =100ma, v o=vo - 2% v out =1.8v - 700 1000 mv v out =2.8v - 150 25 0 v out =3.3v - 1 00 200 current limit (note 2) i limit each channel 1 70 3 0 0 - ma line regulation v line i out =10ma v in = v out +1v to 5.5 v - 0. 1 0. 2 % /v load regulation (note 3) v load i out =1~ 1 00ma v in = 3.5 v - 1 0 3 0 mv ripple rejection psrr f=1 k hz, ,i out = 30 ma - - 6 0 - db enable input threshold v enh 1.5 - - v v enl - - 0.4 enable current i en v in =5v, v en =0v or 5v - - 0. 1 a v out 1 delay (note5) t delay v in =5v - 6 0 - s thermal shutdown temperature t s t - 150 - oc thermal shutdown hysterisis t s h - 30 - oc note 1 : v in (min) = v out +v drop note 2 : current limit is measured at constant junction temperature by using pulsed testing with a low on time. note 3 : regulation is measured at constant junction tempe rature by using pulsed testing with a low on time. note4: guaranteed by design. note5: in enable on condition, t delay =t vout1 -t vout2 ? application circuit c in 1 uf vout 2 vout 1 gnd c out 2 v out 2 c out 1 ax 6640 1 uf 1 uf v out 1 en v in vout 3 1 uf off on vin v out 3 c out 3 v?mw`r?y?b? www.gofotech.com
5/ 11 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 27 , 20 10 AX6640 ? function descriptions the AX6640 is a highly accurate, triple, low noise, cmos ldo voltage regulators with enable function. the output voltage for each regulator is set independently by fuse trimming. as illustrated in function block diagram, it consists of a reference, error amplifier, a p-channel pass transistor, an on/off control logic and an internal feedback voltage divider. the band gap reference is connected to the error amplifier, which compares the reference with the feedback voltage and amplifies the voltage difference. if the feedback voltage is lower than the reference voltage, the pass- transistor gate is pulled lower, which allows more current to pass to the v out pin and increases the output voltage. if the feedback voltage is too high, the pass transistor gate is pulled up to decrease the output voltage. the output voltage is feed back through an internal resistive divider connected to v out pin. additional blocks include an output current limiter, thermal sensor, and shutdown logic. enable function en pin control channel1 and channel2 enable and disable functions. when the en pin is switched to the power off level, the operation of partial internal circuit stops, the build-in p-channel mosfet output transistor between pins v in and v out is switched off, allowing current consumption to be drastically reduced. when channel1 is from dis able to enable, th ere is 60 us delay in power-on or enable-on. dropout voltage a regulators minimum input -output voltage differential, or dropout voltage, determines the lowest usable supply voltage. the AX6640 use a p- channel mosfet pass transistor, its dropout voltage is function of drain- to -source on-resistance r ds (on) multiplied by the load current. current limit each channel of AX6640 includes a fold back current limiter. it monitors and controls the pass transistors gate voltage, estimates the output current, and limits the output current within minimum 17 0ma. thermal shutdown protection thermal shutdown protection limits total power dissipation of AX6640. when the junction temperature exceeds t j = +150c, a thermal sensor turns off the pass transistor, allowing the ic to cool down. the thermal sensor turns the pass transistor on again after the junction temperature cools down by 30c, resulting in a pulsed output during continuo us thermal shutdown conditions. thermal shutdown protection is designed to protect the AX6640 in the event of fault conditions. for continuous operation, the absolute maximum operating junction temperature rating of t j = +125c should not be exceeded. v dropout = v in - v out = r ds ( on ) * i out v?mw`r?y?b? www.gofotech.com
6/ 11 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 27 , 20 10 AX6640 ? app lication information like any low-dropout regulator, the AX6640 requires input and output decoupling capacitors. the device is specifically designed for portable applications requiring minimum board space and smallest components. these capacitors must be correctly selected for good performance. please note that linear regulators with a low dropout voltage have high internal loop gains which require care in guarding against oscillation caused by insufficient decoupling capacitance. input capacitor an input capacitance of 1 f is required between input pin and ground directly (the amount of the capacitance may be increased without limit). the input capacitor must be located less than 1cm from the device to assure input stability. a lower esr capacitor allows the use of less capacitance, while higher esr type (like aluminum electrolytic) requires more capacitance. capacitor types (aluminum, ceramic and tantalum) can be mixed in parallel, but the total equivalent input capacitance/ esr must be defined as above to stable operation. there are no requirements for the esr on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitance will be 1 f over the entire operating temperature range. output capacitor the AX6640 is designed specifically to work with very small ceramic output capacitors. a ceramic capacitor (temperature characteristics x7r, x5r) in 1 f is suitable for the AX6640 application. the recommended capacitance for the device is 2.2 f, x5r or x7r dielectric ceramic, between v out and gnd for stability, but it may be increased without limit. higher capacitance values help to improve transient. the output capacitor's esr is critical because it forms a zero to provide phase lead which is required for loop stability. thermal considerations the AX6640 series can deliver a current of up to 150 ma /channel over the full operating junction temperature range. however, the maximum output current must be debated at higher ambient temperature to ensure the junction temperature does not exceed 125 c. with all possible conditions, the junction temperature must be within the range specified under operating conditions. power dissipation can be calculated based on the output current and the voltage drop across regulator. p d = (v in - v out ) i out + v in i gnd the final operating junction temperature for any set of conditions can be estimated by the following thermal equation: p d (max) = (t j (max) - t a ) / ja where t j (max) is the maximum junction temperature of the die (125 c ) and t a is the maximum ambient temperature. the junction to ambient thermal resistance ( ja ) for tsot- 23 -6l package is recommended 250c/w. v?mw`r?y?b? www.gofotech.com
7/ 11 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 27 , 20 10 AX6640 ? typical ch aracteristics 0 30 60 90 120 150 180 2.5 3 3.5 4 4.5 5 5.5 6 vin (v) supply current (ua) vin vs supply current iout1,2,3=0a AX6640ect 0 30 60 90 120 150 180 -40 -20 0 25 50 85 105 125 temperature supply current (ua) temperature vs supply current vin=5v iout1,2,3=0a 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.5 3 3.5 4 4.5 5 5.5 6 vin (v) en threshold voltage (v) vin vs en threshold voltage enh enl 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 -40 -20 0 25 50 85 105 125 temperature en threshold voltage (v) temperature vs en threshold voltage enh enl vin=5v 0 100 200 300 400 500 600 700 0 30 60 90 120 150 iout (ma) dropout voltage (mv) dropout voltage vout=1.8v vout=2.5v vout=3.3v 0 30 60 90 120 150 180 -40 -20 0 25 50 85 105 125 temperature vout1 delay time (us) temperature vs vout1 delay time vin=5v,en-on iout1,2,3=10ma v?mw`r?y?b? www.gofotech.com
8/ 11 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 27 , 20 10 AX6640 ? typical characteristics (continuous) 1.780 1.785 1.790 1.795 1.800 1.805 1.810 1.815 1.820 2.5 3 3.5 4 4.5 5 5.5 6 vin (v) vout1 (v) vin vs vout1 iout1=10ma AX6640ect 2.760 2.770 2.780 2.790 2.800 2.810 2.820 2.830 2.840 3 3.5 4 4.5 5 5.5 6 vin (v) vout2 (v) vin vs vout2 iout2=10ma AX6640ect 3.240 3.250 3.260 3.270 3.280 3.290 3.300 3.310 3.320 3.330 3.340 3.350 3.360 3.5 4 4.5 5 5.5 6 vin (v) vout3 (v) vin vs vout3 iout3=10ma AX6640ect 1.750 1.760 1.770 1.780 1.790 1.800 1.810 1.820 1.830 1.840 1.850 0 30 60 90 120 150 iout1 (ma) vout1 (v) iout1 vs vout1 vin=5v AX6640ect 2.750 2.760 2.770 2.780 2.790 2.800 2.810 2.820 2.830 2.840 2.850 0 30 60 90 120 150 iout2 (ma) vout2 (v) iout2 vs vout2 vin=5v AX6640ect 3.200 3.220 3.240 3.260 3.280 3.300 3.320 3.340 3.360 3.380 3.400 0 30 60 90 120 150 iout3 (ma) vout3 (v) iout3 vs vout3 vin=5v AX6640ect v?mw`r?y?b? www.gofotech.com
9/ 11 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 27 , 20 10 AX6640 ? typical characteristics (continuous) 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 -40 -20 0 25 50 85 105 125 temperature vout1 (v) temperature vs vout1 vin=5v iout1=10ma AX6640ect 2.60 2.65 2.70 2.75 2.80 2.85 2.90 2.95 3.00 -40 -20 0 25 50 85 105 125 temperature vout2 (v) temperature vs vout2 vin=5v iout2=10ma AX6640ect 3.00 3.05 3.10 3.15 3.20 3.25 3.30 3.35 3.40 3.45 3.50 3.55 3.60 -40 -20 0 25 50 85 105 125 temperature vout3 (v) temperature vs vout3 vin=5v iout3=10ma AX6640ect v?mw`r?y?b? www.gofotech.com
10/ 11 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 27 , 20 10 AX6640 ? typical characteristics (continuous) power off ? on power on ? off enable on load transient (vout1) load transient (vout2) load transient (vout3) v?mw`r?y?b? www.gofotech.com
11/ 11 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 27 , 20 10 AX6640 ? package outlines symbol dimensions in millimeters dimensions in inches min. nom. max. min. nom. max. a - - 1.10 - - 0.043 a1 0.00 - 0.10 0 - 0.004 a2 0.70 0.90 1.00 0.02 8 0.035 0.039 b 0.30 0.40 0.50 0.012 0.016 0.020 c 0.08 0.14 0.20 0.003 0.006 0.008 d 2.80 2.90 3.00 0.110 0.114 0.118 e 2.60 2.80 3.00 0.102 0.110 0.118 e1 1.50 1.60 1.70 0.059 0.063 0.067 e 0.95 bsc. 0.037 bsc. e1 1.90 bsc. 0.075 bsc. l 0.30 0.45 0.60 0.012 0.018 0.024 l1 0.60 ref. 0.024 ref. l2 0.25 bsc. 0.010 bsc. y - - 0.10 - - 0.004 r 0.10 - - 0.004 - - 0 o - 8 o 0 o - 8 o jedec outline: mo-193 aa e 1 e e e 1 b d a a 1 a 2 y l 1 r l c l 2 v?mw`r?y?b? www.gofotech.com

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