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1 / 16 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 3 oct . 1 9 , 20 1 1 ax55 10 6 8 0 k /1.2mh z , high voltage , boost converter ? general description the AX5510 is a high performance, high efficiency step up dc - dc converter with integrated 3 a . the AX5510 converter input voltage ranging from 2.6 to 5.5v . the output voltage can be set up to 2 7v. the selectable frequency of 6 8 0 khz and 1.2 mhz allows the use of small external inductors and capacitors and provides fast transient response. current mode control with external compensation network makes it easy to stabilize the system and keep maxim um flexibility. programmable soft start function minimizes impact on the input power system. internal power mosfet with very low rds (on) provides high efficiency. the AX5510 automatically transits from pwm to pfm during light load condition further increa sing efficiency. the converter also provides protection functions such as current limit and thermal shutdown . the AX5510 is available in space - saving msop - 10l - ep, mosp - 8l - ep , t dfn - 10l and sop - 8l - ep packages. ? features - 2. 6 v to 5.5v operating input voltage r ange - adjustable output voltage range up to 27 v - up to 3 a output switch current - 6 8 0k /1.2m hz selectable switching frequency - programmable soft - start function - external compensation network - c urrent limit and thermal shutdown protect ion - under voltage lockout - 1 a shutdown current - available in the pb - free msop - 10l - ep, msop - 8l - ep , t dfn - 10 l and sop - 8l - ep package s ? b lock d iagram v cc ss lx sgnd control and driver logic en comp 1 . 238 v reference soft start current sense slope compensation oscillator fb error amplifier summing comparator thermal shutdown 7 ua enable / disable pgnd n - mos freq
2 / 16 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 3 oct . 1 9 , 20 1 1 ax55 10 ? pin assignment the package s of AX5510 are m so p - 10 l - ep , t dfn - 10l , sop - 8l - ep and msop - 8l - ep ; the pin assignmen t is given by : name description vcc power input pin en enable pin comp compensation pin fb feedback pin ss soft start pin. connect a cap acitor to gnd gnd groun d pin sgnd signal ground pgnd power ground lx switch output pin freq frequency select pin. the power switch operates at 6 8 0khz if freq is connected to gnd and at 1.2mhz if freq is connected to vcc ( top view ) msop - 10 l - ep lx sgnd vcc comp pgnd ss freq en 1 2 3 4 5 6 7 8 9 10 fb lx exposed pad ( sgnd ) ( top view ) 1 2 3 4 8 7 6 5 en gnd sop / msop - 8 l - ep ax 5913 comp fb ss freq lx vcc exposed pad ( gnd ) t d f n - 1 0 l ( 3 * 3 ) c o m p l x 1 p g n d 1 0 2 3 4 5 6 7 8 9 f b e n s g n d l x v c c f r e q s s e x p o s e d p a d ( s g n d ) t o p v i e w
3 / 16 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 3 oct . 1 9 , 20 1 1 ax55 10 ? order/marking information order information top marking (msop /sop ) top marking ( t dfn) ? absolute maximum ratings (at t a =25 c ) characteristics symbol rating unit vcc pin voltage v cc gnd - 0.3 to g nd + 6 v en, freq, c omp , f b, ss , pin voltage gnd - 0.3 to v cc + 0.3 v lx pin voltage v lx 30 v power dissipation pd ( t j - t a ) / ja mw storage temperature range t st - 65 to +150 c operating junction temperature range t op - 40 to + 125 c thermal resistanc e from junction to case msop - 8/ 10l - ep jc 30 c /w t dfn - 10l 20 sop - 8l - ep 15 thermal resistance from junction to ambient msop - 8/ 10l - ep ja 80 c /w t dfn - 10l 55 sop - 8l - ep 40 note: ja is measured with the pcb copper area of approximately 1 .5 in 2 (multi - layer). that copper area need s connect to exposed pad . ax 5510 x x x x package type packing blank : tube a : taping eu : msop - 10 l - ep j 10 : tdfn - 10 l ( 3 * 3 ) es : sop - 8 l - ep eu 8 : msop - 8 l - ep logo y ax 5 part number id code : internal ww : 01 ~ 52 year : 10 = 2010 11 = 2011 5 1 0 y w w x 5 part number id code : internal ww : 01 ~ 52 year : 10 = 2010 11 = 2011 y y w w x 5 1 0
4 / 16 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 3 oct . 1 9 , 20 1 1 ax55 10 ? electrical characteristics ( v in =5 v, v o ut = 12 v, v en = v in , t a =25c , unless otherwise noted) characteristics symbol conditions min typ max units input voltage range v cc 2. 6 - 5.5 v un der voltage lockout uvlo rising - 2.35 2. 6 v uvlo hysteresis - - 1 5 0 - mv step - up voltage adjust range v out vcc+0.5 - 27 v operating quiescent current i ccq i o ut = 0ma, v fb = 1.5v - 1 50 25 0 a sd v en =0v - 0. 1 1 a fb 1.2 19 1.2 38 1.2 5 7 v fb input leakage current i fb - lkg v fb = 1. 5 v - 100 0.01 +100 na line regulation v in =2. 6 to 5.5v i out =20ma - 0.2 - % load regulation v in =5v i out = 1ma to 0.7a - 0.3 - % oscillator frequency f osc freq=high 900 1200 1500 khz freq=low 500 680 850 freq high - level input voltage v fq - ih 2 - - v freq low - level input voltage v fq - il - - 0.5 freq input leakage current i fq - lkg freq=gnd - - 0.1 ua soft start current i ss 4 7 13 a lim duty=40% 3 3.8 4.5 a mosfet on - resistance (note1) r ds(on) v in =3v, i sw =2a - 200 280 m in =5v, i sw =2a - 160 220 en high - level input voltage v ih 1.0 - - v en low - level input voltage v il - - 0.4 v en hysteresi s hys - 200 - m v en input leakage current i en - lkg v en =gnd or v in - 0.01 0.1 a fb =0v 85 90 - % lx leakage current i lxl v lx = 25v, v fb =1.5v - - 10 a thermal shutdown t d s - 1 5 0 - c thermal shutdown hysteresis t sh - 35 - note guaranteed by design.
5 / 16 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 3 oct . 1 9 , 20 1 1 ax55 10 ? application circuit (1) freq=high (frequency=1.2mhz) (msop - 10l and t dfn - 10l) (2) freq= low (frequency= 68 0k hz) (msop - 10l and t dfn - 10l) r 8 15 k vin = 5 v c 2 2 * 10 uf l 1 4 . 7 uh r 2 130 k vout = 12 v c 7 100 pf u 1 ax 5510 9 3 1 8 10 4 5 2 6 vcc en comp fb ss sgnd pgnd freq lx c 3 0 . 1 uf c 3 3 * 10 uf r 6 100 k c 6 10 nf d 1 b 340 a lx 7 4 . 7 ~ 100 r 3 r 4 1 m c 5 1 nf r 8 r 2 vout = 1 . 238 v x ( 1 + ------- ) r 8 suggest 10 k ~ 30 k vin Q 4 . 5 v , r 3 = 10 vin > 4 . 5 v , r 3 = 100 c 1 220 pf r 8 15 k vin = 5 v c 2 2 * 10 uf l 1 6 . 8 uh r 2 130 k vout = 12 v c 7 150 pf u 1 ax 5510 9 3 1 8 10 4 5 2 6 vcc en comp fb ss sgnd pgnd freq lx c 3 0 . 1 uf c 3 3 * 10 uf r 6 56 k c 6 10 nf d 1 b 340 a lx 7 r 3 r 4 1 m c 5 1 nf r 8 r 2 vout = 1 . 238 v x ( 1 + ------- ) r 8 suggest 10 k ~ 30 k r 7 10 k c 1 220 pf vin Q 4 . 5 v , r 3 = 10 vin > 4 . 5 v , r 3 = 100 4 . 7 ~ 100
6 / 16 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 3 oct . 1 9 , 20 1 1 ax55 10 (3) freq=high (freq uency=1.2mhz) (sop - 8l /msop - 8l ) (4) freq=low (frequency= 68 0khz) ( sop - 8l/msop - 8l) r 8 15 k vin = 5 v c 2 2 * 10 uf l 1 4 . 7 uh r 2 130 k vout = 12 v c 7 100 pf u 1 ax 5510 7 3 1 6 8 4 2 5 vcc en comp fb ss gnd freq lx c 4 0 . 1 uf c 3 3 * 10 uf r 6 100 k c 6 10 nf d 1 b 340 a r 3 r 4 1 m c 8 1 nf r 8 r 2 vout = 1 . 238 v x ( 1 + ------- ) r 8 suggest 10 k ~ 30 k c 1 220 pf vin Q 4 . 5 v , r 3 = 10 vin > 4 . 5 v , r 3 = 100 4 . 7 ~ 100 r 8 15 k vin = 5 v c 2 2 * 10 uf l 1 6 . 8 uh r 2 130 k vout = 12 v c 7 100 pf u 1 ax 5510 7 3 1 6 8 4 2 5 vcc en comp fb ss gnd freq lx c 4 0 . 1 uf c 3 3 * 10 uf r 6 100 k c 6 10 nf d 1 b 340 a r 3 r 4 1 m c 8 1 nf r 8 r 2 vout = 1 . 238 v x ( 1 + ------- ) r 8 suggest 10 k ~ 30 k r 7 10 k c 1 220 pf vin Q 4 . 5 v , r 3 = 10 vin > 4 . 5 v , r 3 = 100 4 . 7 ~ 100
7 / 16 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 3 oct . 1 9 , 20 1 1 ax55 10 ? compensation table frequency(hz) l1 (h) vin (v) vout (v) r6 () c7 (f) 680k (freq=low) 6.8u 2.5~4 .4 5 10k 1.2n 2.5~5. 5 7 15k 470p 2.5~5.5 9 27k 270p 2.5~5.5 12 56k 150p 2.5~5.5 15 150k 120p 2.5~5.5 18 110k 100p 2.5~5.5 21 150k 82p 2.5~5.5 24 100k 47p 1.2m (freq=high) 4.7u 2.5~4.0 5 33k 1n 2.5 ~5.5 7 39k 390p 2.5~5.5 9 39k 220p 2.5~5.5 12 100k 100p 2.5~5.5 15 130k 68p 2.5~5.5 18 150k 56p 2.5~5.5 21 220k 47p 2.5~5.5 24 390k 39p ? application information setting the output voltage application circuit item shows the basic application circuit with AX5510 adjustable ou tput version. the external resistor sets the output voltage according to the following equation: for most applications, r 8 is a suggested a value by 10 ~ 30 k . place the resistor - divider as close to the ic as possible to reduce the noise sensitivity. soft start capacitor the s oft - start function begins from ss pin voltage =0v to v cc with a 7 ua (typ.) constant current charging to the soft - start capacitor, so the capacitor should be large enough to let th e output voltage reach regulation inside the soft - start cycle. typical value of soft - start capacitor range is from 4.7 nf to 10 0nf. after the cycle finished, the load can start to draw maximum current as required. ? ? ? ? ? ? ? ? ? 8 1 238 1 r r v v out 2 .
8 / 16 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 3 oct . 1 9 , 20 1 1 ax55 10 frequency select pin (freq) the freque ncy select pin freq allows to set the switchi ng frequency of the device to 6 8 0 k hz (freq = low) or 1.2 mhz (freq = high). higher switching frequency improves load transient response but reduces slightly the efficiency. the other benefits of higher switchin g frequency are a lower output ripple voltage. usually, it is recommended to use 1.2 mhz switching frequency unless light load efficiency is a major concern. under voltage lockout (uvlo) to avoid mis - operation of the device at low input voltages an under voltage lockout is included that disables the device, if t he input voltage falls below ( 2. 3 5 v - 150mv) . input capacitor selection for better input bypassing, low - esr ceramic capacitors ar e recommended for performance. two parallel 10uf (or one 22uf) input capacitor is sufficient for most applications. for a lower output power requirement application, this value can be decreased. output capacitor selection for lower output voltage ripple, low - esr output capacitor like ceramic capacitor is recommended. thr ee parallel 10uf ceramic capacitors work for most of the applications. higher capacitor values can be used to improve the load transient response and reduce output ripple .
9 / 16 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 3 oct . 1 9 , 20 1 1 ax55 10 layout guide (1) msop - 10l - ep / t dfn - 10l ( 2 ) msop /sop - 8 l - ep c 2 must be placed between v in and p gnd as closer as possible , vin trace should be wide and short . the pgnd trace can not directly connect to sgnd , the trace take a via to ground area of bottom . lx should connected to lnductor by wide and short trace , keep sensitive components away from this trace . r 2 and c 8 should be connected to fb pin by short trace . ax 5510 eu / ax 5510 j 10 vin c 2 l 1 gnd vout lx sgnd vcc pgnd ss freq en 1 2 3 4 5 6 7 8 9 10 lx fb comp expose pad vcc c 4 r 3 c 6 c 7 r 6 r 8 r 2 c 5 r 4 d 1 c 3 r 7 gnd c 4 must be placed between vcc pin and s gnd as closer as possible . the sgnd must connect to exposed pad directly . frequency selection , if freq connect to vcc , the frequency is 1 . 2 mhz , else connect r 7 to gnd , the frequency is 680 khz . c 1 ax 5510 es / ax 5510 eu 8 gnd vcc ss freq en lx fb comp exposed pad c 3 must be placed between v out trace and gnd pin as closer as possible . lx should connected to lnductor by wide and short trace , keep sensitive components away from this trace . r 2 and c 8 should be connected to fb pin by short trace . vin c 2 l 1 gnd vout c 4 r 3 c 6 c 7 r 6 r 8 r 2 c 5 r 4 d 1 c 3 r 7 gnd c 4 must be placed between vcc pin and gnd pin as closer as possible . the gnd must connect to exposed pad directly . frequency selection , if freq connect to vcc , the frequency is 1 . 2 mhz , else connect r 7 to gnd , the frequency is 680 khz . vcc vcc vout c 1
10 / 16 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 3 oct . 1 9 , 20 1 1 ax55 10 ? t ypic al c haracteristics
11 / 16 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 3 oct . 1 9 , 20 1 1 ax55 10 ? typical characteristics (continuous)
12 / 16 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 3 oct . 1 9 , 20 1 1 ax55 10 ? typical characteristics (continuous)
13 / 16 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 3 oct . 1 9 , 20 1 1 ax55 10 ? package outlines (1) m so p - 10l - ep symbol dimensions in millimeters dimensions in inches min. nom. max. min. nom. max. a - - 1.1 - - 0.043 a1 0 0.08 0.15 0 0.003 0.006 a2 0.75 0.85 0.95 0.03 0.034 0.038 c 0.08 0.15 0.23 0.00 3 0.006 0.009 d 2.9 3 3.1 0.114 0.118 0.122 d1 0.75 1.63 2.5 0.03 0.064 0.098 e 4.8 4.9 5 0.189 0.193 0.197 e1 2.9 3 3.1 0.114 0.118 0.122 e2 0.75 1.63 2.5 0.03 0.064 0.098 l 0.4 0.6 0.8 0.016 0.024 0.031 b 0.22 0.3 0.38 0.009 0.012 0.015 e 0.50 bs c 0.020 bsc y - - 0.1 - - 0.004 ? ? o - 8 o 0 o - 8 o jedec outline: mo - 187 ba - t b e e 1 e 1 5 6 1 0 " a " e 2 1 5 6 1 0 d 1 t h e r m a l l y e n h a n c e d v a r i a t i o n s o n l y a a 2 a 1 d c 0 . 0 5 h 0 . 2 5 l l 1 g a u g e p l a n e s e a t i n g p l a n e d e t a i l a
14 / 16 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 3 oct . 1 9 , 20 1 1 ax55 10 (2) msop - 8l - ep symbol dimensions in millimeters dimensions in inches min. nom. max. min. nom. max. a - - 1.1 - - 0.043 a1 0 0.08 0.15 0 0.003 0.006 a2 0.75 0.85 0.95 0.03 0.034 0.038 c 0.08 0.15 0.23 0.003 0.006 0.009 d 2.9 3 3.1 0.114 0.118 0.122 d1 0.75 1.63 2.5 0.03 0.064 0.098 e 4.8 4.9 5 0.189 0.193 0.197 e1 2.9 3 3.1 0.114 0.118 0.122 e2 0.75 1.63 2.5 0.03 0.064 0.098 l 0.4 0.6 0.8 0.016 0.024 0.031 b 0.22 0.3 0.38 0.009 0.012 0.015 e 0.65 bsc 0.026 bsc y - - 0.1 - - 0.004 ? ? 0 o - 8 o 0 o - 8 o jedec outline: mo - 187 aa - t d e t a i l a l e e 1 a a 2 a 1 e d 7 ( 4 x ) b y c d e t a i l a e 2 d 1 e x p o s e p a d 1 4 5 8
15 / 16 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 3 oct . 1 9 , 20 1 1 ax55 10 (3) 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 d e t a i l a l h e a a 2 a 1 e d 7 ( 4 x ) b y c d e t a i l a y x e x p o s e p a d
16 / 16 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 3 oct . 1 9 , 20 1 1 ax55 10 (4) t dfn - 10l (3*3 0.75mm) symbol dimensions i n millimeters dimensions i n inches min. nom. max. min. nom. max. a 0.70 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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