description the HT9261 series are pfm step-up dc-dc converters with very low ripple noise due to the high operation frequency. the maximum operation frequency is 300khz. only three components are required to realize the conversion from the battery voltage to a selected output voltage. a driver pin (ext) is provided for driving external power transistor to extend the output current capability where large cu rrent is required. enable pin (en) is also pr ovided so that the circuit can be powered down. features ? 300khz maximum operation frequency ? 2.0v to 5.0v output voltage with 0.1v step ? low start-up voltage: 0.8v at 1ma ? 2.5% output voltage accuracy ? up to 88% efficiency ? output current: 300ma at 2.5v input, 3.3v output ? low ripple and low noise ? output current extendable by external switch applications ? power source for applications where a higher voltage than the battery voltage is required ? one to three cell battery devices ? power source for cameras, camcorders, vcrs, pdas, papers and hand held communication instrument block diagram - + buffer lx current limiting comparator en ext pfm control osc 400khz chip enable - + error amplifier 1.24v bandgap vout gnd HT9261 1 of 10 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
ordering information HT9261 package type t:sot-23-3 e:sot-89 20:2.0v h:sot-23-5 output voltage 21:2.1v ... 49:4.9v 50:5.0v external switch e: use external switch l: use internal switch pin configuration (top view) lxxh 1 2 5 3 4 en gnd nc lx lxxt 1 2 3 vout lx gnd vout lxxe 1 3 2 vout lx gnd exxh 1 2 5 3 4 en gnd nc ext sot-23-5 exxt 1 2 3 vout ext gnd sot-23-3 vout exxe 1 3 2 vout ext gnd sot-89 HT9261 HT9261 2 of 10 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
pin description part marking and package type pin name pin function HT9261 lxxt sot-23-3 lxxh sot-23-5 lxxe sot-89 exxt sot-23-3 exxh sot-23-5 exxe sot-89 2 5 3 - - - lx switching pin - - - 2 5 3 ext buffer output for external transistor 3 2 2 3 2 2 vout output voltage - 1 - - 1 - en chip enable (active high) 1 4 1 1 4 1 gnd ground - 3 - - 3 - nc no connection absolute maximum ratings type symbol description value unit voltage vmax maximum voltage on vout and vlx pins 8 v vmin-max voltage range on ext and en pins -0.3~vout+0.3 current ilxmax maximum current on lx pin 1000 ma iextmax maximum current on ext pin 100 power dissipation psot-23-3 maximum power dissipation for sot-23-3 0.25 w psot-23-5 maximum power dissipation for sot-23-5 0.25 psot-89 maximum power dissipation for sot-89 0.5 thermal tmin-max operation temperature range -20~85 tstorage storage temperature range -40~165 esd vesd esd voltage for human body mode 2000 v HT9261 3 of 10 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
electronic characteristics parameter symbol test condition min typ max unit output voltage accuracy vout -2.5 2.5 % maximum input voltage vin max 0.7 vout v start-up voltage v start iload=1ma, vin:0 2v 0.85 v hold-on voltage v hold iload=1ma, vin:0 2v 0.6 v maximum oscillation frequency f max 200 250 300 khz oscillator duty cycle dc osc 75 80 85 % efficiency 85 88 % current limit i limit 600 800 1000 ma input current at no load iin0 vin=1.8v, vout=3.0v 20 a vin=1.8v, vout=5.0v a vout pin current at switch off iout0 drive vout pin with voltage vout+0.5v 6 8 a input standby current iinq no load, en=?low? 1 a en ?high? voltage level 0.4*vout v en ?low? level 0.2 v en ?high? input current 0.1 a en ?low? input current -0.1 a ext output current -5 5 ma typical characteristics (using internal switch transistor) HT9261 4 of 10 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
HT9261 5 of 10 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
HT9261 6 of 10 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
typical applications typical applications HT9261 lx l vin + - 22uh gnd 1n5819 vout vout c 22uf HT9261 ext l vin + - 22uh gnd 1n5819 vout vout c 22uf cb 0.01uf 300 rb ztx650 HT9261 7 of 10 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
package sot- 23-3l package outline dimensions symbol dimensions in millimeters dimensions in inches min max min max a 1.050 1.250 0.041 0.049 a1 0.000 0.100 0.000 0.004 a2 1.050 1.150 0.041 0.045 b 0.300 0.400 0.012 0.016 c 0.100 0.200 0.004 0.008 d 2.820 3.020 0.111 0.119 e 1.500 1.700 0.059 0.067 e1 2.650 2.950 0.104 0.116 e 0.950typ 0.037typ e1 1.800 2.000 0.071 0.079 l 0.700ref 0.028ref l1 0.300 0.600 0.012 0.024 0 ? 8 ? 0 ? 8 ? HT9261 8 of 10 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
sot-23-5l package outline dimensions symbol dimensions in millimeters dimensions in inches min max min max a 1.050 1.250 0.041 0.049 a1 0.000 0.100 0.000 0.004 a2 1.050 1.150 0.041 0.045 b 0.300 0.400 0.012 0.016 c 0.100 0.200 0.004 0.008 d 2.820 3.020 0.111 0.119 e 1.500 1.700 0.059 0.067 e1 2.650 2.950 0.104 0.116 e 0.950typ 0.037typ e1 1.800 2.000 0.071 0.079 l 0.700typ 0.028typ l1 0.300 0.600 0.012 0.024 0 ? 8 ? 0 ? 8 ? HT9261 9 of 10 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
sot-89-3l package outline dimensions symbol dimensions in millimeters dimensions in inches min max min max a 1.400 1.600 0.055 0.063 b 0.320 0.520 0.013 0.197 b1 0.400 0.580 0.016 0.023 c 0.350 0.440 0.014 0.017 d 4.400 4.600 0.173 0.181 d1 1.550ref 0.061ref e 2.300 2.600 0.091 0.102 e1 3.940 4.250 0.155 0.167 e 1.500typ 0.060typ e1 3.000typ 0.118typ l 0.900 1.200 0.035 0.047 HT9261 10 of 10 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
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