TS1910A 680khz/1.2mhz high voltage boost converter 1/8 version: a12 so p - 8 ep general description the TS1910A is a high performance, high efficiency step up dc-dc converter with integrated 2a. the ts1 910a converter input voltage ranging from 2.6 to 5.5v. t he output voltage can be set up to 27v. the selecta ble frequency of 680khz and 1.2mhz allows the use of sm all external inductors and capacitors and provides fast transient response. current mode control with exter nal compensation network makes it easy to stabilize the system and keep maximum flexibility. programmable s oft start function minimizes impact on the input po wer system. internal power mosfet with very low r ds(on) provides high efficiency. the TS1910A automaticall y transits from pwm to pfm during light load conditio n further increasing efficiency. the converter also provides protection functions such as current limit and ther mal shutdown. features 2.6v to 5.5v operating input voltage range adjustable output voltage range up to 27v up to 3a output switch current 680k/1.2mhz selectable switching frequency programmable soft-start function external compensation network current limit and thermal shutdown protection under voltage lockout 1a shutdown current application digital still cameras portable electronics pdas and palm-top computers local boost regulator ordering information part no. package packing TS1910Acs rlg sop-8ep 2.5kpcs / 13 reel note: g denotes for halogen free absolute maximum rating parameter symbol limit unit vcc pin voltage v cc gnd - 0.3 to gnd + 6 v en, freq,comp,fb,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 resistance from junction to case jc 15 c/w thermal resistance from junction to ambient ja 40 c/w note: ja is measured with the pcb copper area of approximat ely 1.5 in2(multi-layer). that copper area needs connect to exposed pad. pin definition : 1. comp 8. ss 2. fb 7. freq 3. en 6. vcc 4. gnd 5. lx
TS1910A 680khz/1.2mhz high voltage boost converter 2/8 version: a12 electrical specifications (ta = 25 o c, v in =5v, en=v in , i l =0a unless otherwise noted) characteristics symbol conditions min typ max units input voltage range v cc 2.6 -- 5.5 v under voltage lockout uvlo rising -- 2.35 2.6 v uvlo hysteresis uvlohys -- -150 -- mv step-up voltage adjust range v out v cc +0.5 -- 27 v operating quiescent current i ccq i out =0ma, v fb =1.5v -- 150 250 a shutdown current i sd v en =0v -- 0.1 1 a feedback voltage v fb 1.219 1.238 1.257 v fb input leakage current i fb-lkg v fb = 1.5v -100 0.01 +100 na line regulation reg line v in =2.6 to 5.5v i out =20ma -- 0.2 -- % load regulation reg load 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 n-channel mosfet current limit i lim duty=40% 3 3.8 - a mosfet on-resistance (note) r ds(on) v in =3v, i sw =2a -- 200 280 m ? v 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 hysteresis enhys -- 200 - mv en input leakage current i en-lkg v en =gnd or v in -- 0.01 0.1 a maximum duty cycle duty v fb =0v 85 90 -- % lx leakage current i lxl v lx =25v, v fb =1.5v -- -- 10 a thermal shutdown tsd -- 150 -- c thermal shutdown hysteresis thys -- 35 -- note: guaranteed by design
TS1910A 680khz/1.2mhz high voltage boost converter 3/8 version: a12 block diagram vcc ss lx sgnd control and driver logic en comp 1.238v reference soft start current sense slope compensation oscillator fb error amplifier summing comparator thermal shutdown 7ua enable/ disable pgnd n-mos freq pin description pin number pin name description 1 comp compensation pin 2 fb feedback pin 3 en enable pin 4 gnd ground pin 5 lx switch output pin 6 v cc power input pin 7 freq frequency select pin. the power switch operates at 680khz if freq is connected to gnd and at 1.2mhz if freq is connected to vcc 8 ss soft start pin. connect a capacitor to gnd
TS1910A 680khz/1.2mhz high voltage boost converter 4/8 version: a12 application circuit freq=high (frequency=1.2mhz) r8 15k vin=5v c2 2*10uf l1 4.7uh r2 130k vout=12v c7 100pf u1 ax5510a 7 3 1 6 8 4 2 5 vcc en comp fb ss gnd freq lx c4 0.1uf c3 3*10uf r6 100k c6 10nf d1 b340a r3 r4 1m c8 1nf r8 r2 vout = 1.238v x (1 + ------- ) r8 suggest 10k~30k c1 220pf vin Q 4.5v, r3=10 vin > 4.5v, r3=100 4.7~100 freq=low (frequency=680khz) r8 15k vin=5v c2 2*10uf l1 6.8uh r2 130k vout=12v c7 100pf u1 ax5510a 7 3 1 6 8 4 2 5 vcc en comp fb ss gnd freq lx c4 0.1uf c3 3*10uf r6 100k c6 10nf d1 b340a r3 r4 1m c8 1nf r8 r2 vout = 1.238v x (1 + ------- ) r8 suggest 10k~30k r7 10k c1 220pf vin Q 4.5v, r3=10 vin > 4.5v, r3=100 4.7~100
TS1910A 680khz/1.2mhz high voltage boost converter 5/8 version: a12 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 applicatio n circuit with TS1910A adjustable output version. t he external resistor sets the output voltage according to the f ollowing equation: v out =1.238v x (1+r2/r8) for most applications, r8 is a suggested a value by 10~30k ? . place the resistor-divider as close to the ic as possible to reduce the noise sensitivity. soft start capacitor the soft-start function begins from ss pin voltage= 0v to v cc with a 7ua (typ.) constant current charging to the soft- start capacitor, so the capacitor should be large e nough to let the output voltage reach regulation in side the soft-start cycle. typical value of soft-start capacitor range is from 4.7nf to 100nf. after the cycle finished, t he load can start to draw maximum current as required. frequency select pin (freq) the frequency select pin freq allows to set the swi tching frequency of the device to 680 khz (freq = l ow) or 1.2 mhz (freq = high). higher switching frequency impro ves load transient response but reduces slightly th e efficiency. the other benefits of higher switching frequency are a lower output ripple voltage. usuall y, it is recommended to use 1.2 mhz switching frequency unle ss light load efficiency is a major concern.
TS1910A 680khz/1.2mhz high voltage boost converter 6/8 version: a12 application information (continue) under voltage lockout (uvlo) to avoid mis-operation of the device at low input v oltages an under voltage lockout is included that d isables the device, if the input voltage falls below (2.35v-150 mv). input capacitor selection for better input bypassing, low-esr ceramic capacit ors are recommended for performance. two parallel 1 0uf (or one 22uf) input capacitor is sufficient for most ap plications. for a lower output power requirement ap plication, this value can be decreased. output capacitor selection for lower output voltage ripple, low-esr output cap acitor like ceramic capacitor is recommended. three 10uf ceramic capacitors work for most of the application s. higher capacitor values can be used to improve t he load transient response and reduce output ripple. layout guide
TS1910A 680khz/1.2mhz high voltage boost converter 7/8 version: a12 sop-8ep mechanical drawing sop-8ep dimension dim millimeters inches min max min max. a 4.80 5.00 0.189 0.196 b 3.80 4.00 0.150 0.157 c 1.35 1.75 0.054 0.068 d 0.35 0.49 0.014 0.019 e 2.05 2.41 0.081 0.095 e1 2.82 3.30 0.111 0.130 f 0.40 1.25 0.016 0.049 g 1.27bsc 0.05bsc k 0.10 0.25 0.004 0.009 m 0o 7o 0o 7o p 5.80 6.20 0.229 0.244 r 0.25 0.50 0.010 0.019
TS1910A 680khz/1.2mhz high voltage boost converter 8/8 version: a12 notice specifications of the products displayed herein are subject to change without notice. tsc or anyone on its behalf, assumes no responsibility or liability for any erro rs or inaccuracies. information contained herein is intended to provide a product description only. no license, express or implied, to any intellectual property rights is granted by this document. except as provided in tscs terms and co nditions of sale for such products, tsc assumes no liability wh atsoever, and disclaims any express or implied warr anty, relating to sale and/or use of tsc products includi ng liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, cop yright, or other intellectual property right. the products shown herein are not designed for use in medical, life-saving, or life-sustaining applica tions. customers using or selling these products for use i n such applications do so at their own risk and agr ee to fully indemnify tsc for any damages resulting from such i mproper use or sale.
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