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ht77xx pfm step-up dc/dc converter selection table part no. output voltage package marking ht7718 1.8v to-92 sot-89 sot-23 sot-25 ht77xx (for to-92) ht77xx# (for sot-89) 77xx# (for sot-23) 77xx# (for sot-25) ht7727 2.7v ht7730 3.0v ht7733 3.3v ht7737 3.7v HT7750 5.0v note: xx stands for output voltages. only lead free devices are available. # stands for lead free devices. for the to-92 package, there will be a # mark at the end of the date code. block diagram rev 1.60 1 september 12, 2007 features low start-up voltage: 0.7v (typ.), 0.9v (max.) high efficiency: 85% (typ.), v out 2.7v high output voltage accuracy: 2.5% output voltage: 1.8v, 2.7v, 3.0v, 3.3v, 3.7v, 5.0v ultra low supply current i dd2 :4 a (typ.) low ripple and low noise low shutdown current: 0.5 a (typ.) to-92, sot-89, sot-23 and sot-25 package applications palmtops/pdas portable communicators/smartphones cameras/camcorders battery-powered equipment general description the ht77xx series is a set of pfm step-up dc/dc con - verter with high efficiency and low ripple. the series fea - tures extremely low start-up voltage and high output voltage accuracy. they require only three external com - ponents to provide a fixed output voltage of 1.8v, 2.7v, 3.0v, 3.3v, 3.7v or 5.0v. cmos technology ensures ul - tra low supply current and makes them ideal for bat - tery-operated applications powered from one or more cells. the ht77xx consists of an oscillator, a pfm control cir - cuit, a driver transistor, a reference voltage unit, and a high speed comparator. they employ pulse frequency modulation (pfm) for minimum supply current and rip - ple at light output loading. these devices are available in space saving to-92, sot-89, sot-23 and sot-25 packages. for sot-25 package, it also build-in a chip enable function to reduce power consumption during shutdown mode.

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pin assignment pin description pin no. pin name description to-92 sot-89 sot-23 sot-25 1 ce chip enable pin, high active 2232 vout dc/dc converter output monitoring pin 3 nc no connection 1114gnd ground pin 3325lx switching pin absolute maximum ratings supply voltage ..............................v ss 0.3v to v ss +7v storage temperature ............................ 50 cto125 c operating temperature ........................... 40 cto85 c note: these are stress ratings only. stresses exceeding the range specified under absolute maximum ratings may cause substantial damage to the device. functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil - ity. thermal information symbol parameter package max. unit ja thermal resistance (junction to ambient) (assume no ambient airflow, no heat sink) sot-89 300 c/w to-92 300 c/w sot-23 330 c/w sot-25 320 c/w p d power dissipation sot-89 0.33 w to-92 0.33 w sot-23 0.3 w sot-25 0.31 w note: p d is measured at ta= 25 c ht77xx rev 1.60 2 september 12, 2007 $ % $ ! $

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electrical characteristics v in =v out
0.6; i out =10ma; ta=25 c (unless otherwise specified) symbol parameter test conditions min. typ. max. unit v in input voltage 6v v out output voltage tolerance 2.5 2.5 % v start start-up voltage (fig. 1) v in :0 2v; i out =1ma 0.7 0.9 v v hold minimum hold-on voltage (fig. 1) v in :2 0v; i out =1ma 0.7 v i in no-load input current (fig. 1) i out =0ma 10 20 a i dd1 supply current 1 (fig. 2) v s =v out
0.95 measured at v out pin v out =1.8v 35 50 a v out =2.7v 40 60 v out =3.0v 45 68 v out =3.3v 55 81 v out =3.7v 64 85 v out =5.0v 85 134 i dd2 supply current 2 (fig. 2) v s =v out +0.5v measured at v out pin 47 a i shdn shutdown current ce=gnd 0.5 1 a v ih ce high threshold 2 v v il ce low threshold 0.4 v i leak lx leakage current (fig. 3) v s =v out +0.5v, v x =6v measured at the lx pin 0.9 a f osc maximum oscillator frequency (fig. 3) v s =v out
0.95 measured at lx pin 115 khz d osc oscillator duty cycle (fig. 3) v s =v out
0.95 measured at lx pin 65 75 85 % efficiency v out 1.8v 80 % v out 2.7v 85 note: absolute maximum ratings indicate limits beyond which damage to the device may occur. operating ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. the guaranteed specifications apply only for the test conditions listed. test circuit ht77xx rev 1.60 3 september 12, 2007 )

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typical performance characteristics ht77xx rev 1.60 4 september 12, 2007 " / + , 0 1 * 0 - 0 - * 0 . 0 . * 0 2 0 2 * * & * ( * 2 * - * * * & * ( * ) 3 0 * ) 3 0 & ) 3 0 ( ) 3 0 2 + % 4 , ht7718 output voltage v.s output current ) " / + , * & ( 2 - * & ( 2 - & * 0 * * 0 1 * 0 - * 0 . * 0 2 * 0 * 0 ( * 0 ' * 0 & * 0 * 0 * " 5 6 5 + % 4 , ht7718 start-up& hold-on voltage * & * ( * 2 * - * * * & * ( * + % 4 , 1 * 7 - 7 - * 7 . 7 . * 7 2 7 2 * 7 7 ) 3 0 * !

8 8 9 + 7 , ) 3 0 & ) 3 0 2 ) 3 0 ( ht7718 efficiency v.s output current + % 4 , " / + , & 0 - * & 0 . & 0 . * & 0 2 & 0 2 * & 0 & 0 * * & * ( * 2 * - * * * & * ( * ) 3 & 0 * ) 3 0 - ) 3 0 2 ) 3 0 & ht7727 output voltage v.s output current + % 4 , !

8 8 9 + 7 , 1 * - - * . . * 2 2 * * & * ( * 2 * - * * * & * ( * ) 3 & 0 * ) 3 0 - ) 3 0 2 ) 3 0 & ht7727 efficiency v.s output current + % 4 , ) " / + , 0 * * 0 1 * 0 - * 0 . * 0 2 * 0 * 0 ( * 0 ' * 0 & * 0 * 0 * * & ( 2 - * & ( 2 - " 6 ht7727 start-up& hold-on voltage
ht77xx rev 1.60 5 september 12, 2007 + % 4 , " / + , ' 0 * & ' 0 * * & 0 1 - & 0 1 2 & 0 1 ( & 0 1 & & 0 1 * & 0 - - & 0 - 2 & 0 - ( & 0 - & & 0 - * * & * ( * 2 * - * * * & * ( * ) 3 & 0 * ) 3 0 - ) 3 0 ) 3 0 & ht7730 output voltage v.s output current + % 4 , !

8 8 9 + 7 , - - * . . * 2 2 * * * & * ( * 2 * - * * * & * ( * ) 3 & 0 * ) 3 0 - ) 3 0 ) 3 0 & ht7730 efficiency v.s output current + % 4 , ) " / + , * & ( 2 - * & ( 2 - & * " 6 0 0 * * 0 1 * 0 - * 0 . * 0 2 * 0 * 0 ( * 0 ' * 0 & * 0 * 0 * ht7730 start-up& hold-on voltage + % 4 , " / + , ' 0 ( ' 0 ' ' 0 & ' 0 ' 0 * & 0 1 & 0 - & 0 . & 0 2 & 0 * & * ( * 2 * - * * * & * ( * ) 3 & 0 * ) 3 0 - ) 3 0 ) 3 0 & ht7733 output voltage v.s output current + % 4 , !

8 8 9 + 7 , 1 * - - * . . * 2 2 * * * & * ( * 2 * - * * * & * ( * ) 3 & 0 * ) 3 0 - ) 3 0 ) 3 0 & ht7733 efficiency v.s output current + % 4 , ) " / + , 0 * * 0 1 * 0 - * 0 . * 0 2 * 0 * 0 ( * 0 ' * 0 & * 0 * 0 * * & ( 2 - * & ( 2 - & * " 6 ht7733 start-up& hold-on voltage
ht77xx rev 1.60 6 september 12, 2007 + % 4 , " / + , ( 0 * ' 0 1 ' 0 - ' 0 . ' 0 2 ' 0 ' 0 ( ' 0 ' ' 0 & ' 0 ' 0 * & 0 1 & 0 - & 0 . & 0 2 & 0 * & * ( * 2 * - * * * & * ( * ) 3 ' 0 * ) 3 & 0 & ) 3 0 ) 3 0 & ht7737 output voltage v.s output current + % 4 , !

8 8 9 + 7 , 1 * - - * . . * 2 2 * * ( ( * * & * ( * 2 * - * * * & * ( * ) 3 & 0 & ) 3 ' 0 * ) 3 0 ) 3 0 & ht7737 efficiency v.s output current + % 4 , ) " / + , 0 0 * * 0 1 * 0 - * 0 . * 0 2 * 0 * 0 ( * 0 ' * 0 & * 0 * 0 * * & ( 2 - * & ( 2 - & * " 6 ht7737 start-up& hold-on voltage + % 4 , " / + , 0 0 * ( 0 ( 0 * ' 0 ' 0 * & 0 & 0 * 0 * & * ( * 2 * - * * * & * ( * ) 3 ' 0 * ) 3 & 0 * ) 3 0 ) 3 0 & HT7750 output voltage v.s output current + % 4 , !

8 8 9 + 7 , * * 1 * - * . * 2 * * ( * ' * & * * & * ( * 2 * - * * * & * ( * ) 3 ' 0 * ) 3 & 0 * ) 3 0 ) 3 0 & HT7750 efficiency v.s output current + % 4 , ) " / + , 0 - 0 2 0 ( 0 & 0 * * 0 - * 0 2 * 0 ( * 0 & * 0 * * & ( 2 - * & ( 2 - & * " 6 HT7750 start-up& hold-on voltage
ht77xx rev 1.60 7 september 12, 2007 ht7727 load transient response (l=100 h, c out =100 f, v in =1.62v) ht7718 load transient response (l=100 h, c out =100 f, v in =1.08v) ht7730 load transient response (l=100 h, c out =100 f, v in =1.8v) ht7733 load transient response (l=100 h, c out =100 f, v in =1.98v) ht7737 load transient response (l=100 h, c out =100 f, v in =2.22v) * % : 6 ; * % 4 " 6 & * % 4 : 6 ; HT7750 load transient response (l=100 h, c out =100 f, v in =3v)
ht77xx rev 1.60 8 september 12, 2007 & * % : 6 ; ) : 6 ; HT7750 line transient response (l=100 h, c out =100 f) & * % : 6 ; ) : 6 ; ht7733 line transient response (l=100 h, c out =100 f)
application circuits without ce pin with ce pin note: for the sot-25 package, when ce is pulled low, the internal blocks of the device, such as the reference band gap, gain block, and all feedback and control circuitry will be switched off. the boost converter s output, v out , will be at a value one schottky diode voltage drop below the input voltage and the lx pin remains in a high im - pedance condition. the output capacitor and load at v out determine the rate at which v out decays. ht77xx rev 1.60 9 september 12, 2007 )

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package information 3-pin to-92 outline dimensions symbol dimensions in mil min. nom. max. a 170 200 b 170 200 c 500 d11 20 e90 110 f45 55 g45 65 h 130 160 i8 18 4 6 ht77xx rev 1.60 10 september 12, 2007 4 !
3-pin sot-89 outline dimensions symbol dimensions in mil min. nom. max. a 173 181 b64 72 c90 102 d35 47 e 155 167 f14 19 g17 22 h 59 i55 63 j14 17 ht77xx rev 1.60 11 september 12, 2007 4 ! ) <
3-pin sot-23 outline dimensions symbol dimensions in mm min. nom. max. a1 1.3 a1 0.1 a2 0.7 0.9 b 0.35 0.5 c 0.1 0.25 d 2.7 3.1 e 1.4 1.8 e 1.9 h 2.6 3 l 0.37 1 9 ht77xx rev 1.60 12 september 12, 2007 ! 4 & # 4 4
5-pin sot-25 outline dimensions symbol dimensions in mm min. nom. max. a 1.00 1.30 a1 0.10 a2 0.70 0.90 b 0.35 0.50 c 0.10 0.25 d 2.70 3.10 e 1.40 1.80 e 1.90 h 2.60 3 l 0.37 1 9 ht77xx rev 1.60 13 september 12, 2007 ! 4 & # 4 4
product tape and reel specifications to-92 reel dimensions (unit: mm) ht77xx rev 1.60 14 september 12, 2007 - " 8 " / = " 6 " 8 " / = " 6 $ ' 2 * - - ' * ( '
sot-89, sot-23 & sot-25 reel dimensions sot-89 symbol description dimensions in mm a reel outer diameter 180 1.0 b reel inner diameter 62 1.5 c spindle hole diameter 12.75+0.15 d key slit width 1.9 0.15 t1 space between flange 12.4+0.2 t2 reel thickness 17 0.4 sot-23 symbol description dimensions in mm a reel outer diameter 178 1 b reel inner diameter 62 1 c spindle hole diameter 13 0.2 d key slit width 2.5 0.25 t1 space between flange 8.4+1.5 t2 reel thickness 11.4+1.5 sot-25 symbol description dimensions in mm a reel outer diameter 178 1.0 b reel inner diameter 62 1.0 c spindle hole diameter 13.0 0.2 d key slit width 2.5 0.25 t1 space between flange 8.4+1.5 0.0 t2 reel thickness 11.4+1.5 ht77xx rev 1.60 15 september 12, 2007 4 &
to-92 carrier tape dimensions to-92 symbol description dimensions in mm i1 taped lead length (2.5) p component pitch 12.7 1.0 p 0 perforation pitch 12.7 0.3 p 2 component to perforation (length direction) 6.35 0.4 f 1 lead spread 2.5+0.4 0.1 f 2 lead spread 2.5+0.4 0.1 h component alignment 0 0.1 w carrier tape width 18.0+1.0 0.5 w 0 hold-down tape width 6.0 0.5 w 1 perforation position 9.0 0.5 w 2 hold-down tape position (0.5) h 0 lead clinch height 16.0 0.5 h 1 component height less than 24.7 d 0 perforation diameter 4.0 0.2 t taped lead thickness 0.7 0.2 h component base height 19.0 0.5 note: thickness less than 0.38 0.05mm~0.5mm p0 accumulated pitch tolerance: 1mm/20pitches. ( ) bracketed figures are for reference only. ht77xx rev 1.60 16 september 12, 2007 & & * * > & > * > > *
sot-89, sot-23 & sot-25 carrier tape dimensions sot-89 symbol description dimensions in mm w carrier tape width 12.0+0.3 0.1 p cavity pitch 8.0 0.1 e perforation position 1.75 0.1 f cavity to perforation (width direction) 5.5 0.05 d perforation diameter 1.5+0.1 d1 cavity hole diameter 1.5+0.1 p0 perforation pitch 4.0 0.1 p1 cavity to perforation (length direction) 2.0 0.10 a0 cavity length 4.8 0.1 b0 cavity width 4.5 0.1 k0 cavity depth 1.8 0.1 t carrier tape thickness 0.30 0.013 c cover tape width 9.3 sot-23 symbol description dimensions in mm w carrier tape width 8 0.3 p cavity pitch 4 e perforation position 1.75 f cavity to perforation (width direction) 3.5 0.05 d perforation diameter 1.5+0.1 d1 cavity hole diameter 1.5+0.1 p0 perforation pitch 4 p1 cavity to perforation (length direction) 2 a0 cavity length 3.15 b0 cavity width 3.2 k0 cavity depth 1.4 t carrier tape thickness 0.2 0.03 c cover tape width 5.3 ht77xx rev 1.60 17 september 12, 2007 > * ! ? * * 4 *
sot-25 symbol description dimensions in mm w carrier tape width 8.0 0.3 p cavity pitch 4.0 e perforation position 1.75 f cavity to perforation (width direction) 3.5 0.05 d perforation diameter 1.5+0.1 d1 cavity hole diameter 1.5+0.1 p0 perforation pitch 4.0 p1 cavity to perforation (length direction) 2.0 a0 cavity length 3.15 b0 cavity width 3.2 k0 cavity depth 1.4 t carrier tape thickness 0.20 0.03 c cover tape width 5.3 ht77xx rev 1.60 18 september 12, 2007
ht77xx rev 1.60 19 september 12, 2007 holtek semiconductor inc. (headquarters) no.3, creation rd. ii, science park, hsinchu, taiwan tel: 886-3-563-1999 fax: 886-3-563-1189 http://www.holtek.com.tw holtek semiconductor inc. (taipei sales office) 4f-2, no. 3-2, yuanqu st., nankang software park, taipei 115, taiwan tel: 886-2-2655-7070 fax: 886-2-2655-7373 fax: 886-2-2655-7383 (international sales hotline) holtek semiconductor inc. (shanghai sales office) 7th floor, building 2, no.889, yi shan rd., shanghai, china 200233 tel: 86-21-6485-5560 fax: 86-21-6485-0313 http://www.holtek.com.cn holtek semiconductor inc. (shenzhen sales office) 5/f, unit a, productivity building, cross of science m 3rd road and gaoxin m 2nd road, science park, nanshan district, shenzhen, china 518057 tel: 86-755-8616-9908, 86-755-8616-9308 fax: 86-755-8616-9722 holtek semiconductor inc. (beijing sales office) suite 1721, jinyu tower, a129 west xuan wu men street, xicheng district, beijing, china 100031 tel: 86-10-6641-0030, 86-10-6641-7751, 86-10-6641-7752 fax: 86-10-6641-0125 holtek semiconductor inc. (chengdu sales office) 709, building 3, champagne plaza, no.97 dongda street, chengdu, sichuan, china 610016 tel: 86-28-6653-6590 fax: 86-28-6653-6591 holtek semiconductor (usa), inc. (north america sales office) 46729 fremont blvd., fremont, ca 94538 tel: 1-510-252-9880 fax: 1-510-252-9885 http://www.holtek.com copyright 2007 by holtek semiconductor inc. the information appearing in this data sheet is believed to be accurate at the time of publication. however, holtek as - sumes no responsibility arising from the use of the specifications described. the applications mentioned herein are used solely for the purpose of illustration and holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. holtek s products are not authorized for use as critical components in life support devices or systems. holtek reserves the right to alter its products without prior notification. for the most up-to-date information, please visit our web site at http://www.holtek.com.tw.

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