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description the HT9266 is a compac t, high efficiency, and low voltage step-up dc/dc converter with an adaptive current mode pwm control loop, includes an error amplifier, ramp generator, comparator, switch pass element and driver in which providing a stable and high efficient operation over a wide r ange of load currents. it operates in stable waveforms without external compensation. the low start-up input voltage below 1v makes HT9266 suitable for 1 to 4 battery cells applications of providing up to 300ma output current. the 450khz high switching rate minimized the size of external components. besides, the 17 a low quiescent current together with high efficiency maintains long battery lifetime. the output voltage is set with two external resistors. both internal 2a switch and driver for driving external power devices (nmos or npn) are provided. features ? 1.0v low start-up input voltage ? high supply capability to deliver 3.3v 100ma with 1 alkaline cell ? 17 a quiescent (switch-off) supply current ? zero shutdown mode supply current ? 90% efficiency ? 450khz fixed switching frequency ? providing flexibility for using internal and external power switches ? small sot-26 & sot89-5 package applications ? pda ? dsc ? lcd panel ? rf-tags ? mp3 ? portable instrument ? wireless equipment block diagram - + loop control circuit 1.25v vdd over temp. detector shut down vdd fb ce gnd lx ext r2 q2 nmos q1 nmos r1 HT9266 1 of 13 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
ordering information HT9266 package type e:sot-26 x5:sot-89-5 operating temperature range c:commercial standard pin configuration (top view) fb ce vdd gnd lx sot-26 1 2 3 4 5 ce vdd fb lx gnd sot-89-5 ext 1 2 34 5 6 pin description pin no. pin name pin function HT9266cx5 HT9266ce 1 1 ce chip enable HT9266 gets into shutdown mode when ce pin set to low. - 2 ext output pin for driving external nmos 5 3 gnd ground 4 4 lx pin for switching 2 5 vdd input positive power pin of HT9266 3 6 fb feedback input pin internal reference voltage for the error amplifier is 1.25v. HT9266 2 of 13 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
test circuit a a HT9266 vdd ce ext lx fb gnd vin i(vin) + c3 100uf l1 10uh i(vdd) c2 1uf r3 100 r1 1.6m/3m c4 102 c1 100uf c5 106 r2 980k/1m vout 3.3v/5v d1 1n5819 + absolute maximum ratings supply voltage............... ................ ................ ............... ................ ........ -0.3v to7v lx pin switch voltage .... ................. ............... ................ ............... ......... -0.3v to7v other i/o pin voltages...... ................. ............... ....... ........ ............... ........ -0.3v to (vdd + 0.3v) lx pin switch current.............................................................................. 2.5a ext pin driver current.......... ............... ................. ............... ............. ....... 200ma package thermal resistance sot-26, jc .............................................................................................. 145 /w sot-89-5, jc ........................................................................................... 45c/w operating junction temperatur e ................... ............. .............. ............... 125c storage temperature range............. ............... ................ ............... ......... -65c to +150c note: absolute maximum ratings are thre shold limit values that must not be exceeded even for an instant under any conditions. moreover, such values for any two items must not be reached simultaneously. operation above these absolute maximum ratings may cause degradation or permanent damage to the device. these are stress ratings only and do not necessarily imply functional operation below these limits. HT9266 3 of 13 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
electrical characteristics (v in = 1.5v, vdd set to 3.3v, load current = 0, t a = 25c, unless otherwise specified) parameter symbol test conditions min typ max units start-up voltage v st i l = 1ma - 0.98 1.05 v operating vdd range v dd v dd pin voltage 2 - 6 v shutdown current i (v in ) i off ce pin = 0v, v in = 4.5v - 0.01 1 a switch-off current i (vdd) i switch off v in = 6v - 17 25 a continuous switching current i switch v in = ce= 3.3v, v fb = gnd 0.4 0.55 0.7 ma no load current i (v in ) i no load v in = 1.5v, v out = 3.3v - 75* - a feedback reference voltage v ref close loop, v dd = 3.3v 1.225 1.25 1.275 v switching frequency f s v dd = 3.3v 425 500 575 khz maximum duty d max v dd = 3.3v 85 95 - % lx on resistance v dd = 3.3v - 0.3 1.1 ? current limit setting i limit v dd = 3.3v 1.6 2 2.6** a ext on resistance to vdd v dd = 3.3v - 5 8.5 ? ext on resistance to gnd v dd = 3.3v - 5 8.5 ? line regulation v line v in = 3.5 ~ 6v, i l = 1ma - 1.5 10 mv/v load regulation v load v in = 2.5v, i l = 1 ~ 100ma - 0.25*** - mv/ma ce pin trip level v dd = 3.3v 0.4 0.8 1.2 v temperature stability for vout t s - 50 - ppm/ thermal shutdown hysterises t sd - 10 - note: * no load current is highly dependent on practical system design and component selection that cannot be covered by production testing. typical no load curr ent is verified by typica l application circuit with recommended components. no load current performanc e is guaranteed by switch off current and continuous switching current. ** current limit is guaranteed by design at t a = 25c. ***load regulation is not tested at production due to practical instrument limitation. load regulation performance is dominantly dependent on dc loop gain and lx on resistance that are guaranteed by ?line regulation? and ?lx on resistance? tests in production. HT9266 4 of 13 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
typical operating characteristics (refer to test circuit) HT9266 5 of 13 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
HT9266 6 of 13 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
HT9266 7 of 13 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
HT9266 8 of 13 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
application information output voltage setting referring to typical a pplication circuits, the output voltage of the switching regulator (v out ) can be set with eq.1. v 25 . 1 ) 2 r 1 r 1 ( v out ? ? ? eq.1 feedback loop design referring to typical application circuits, the selection of r1 and r2 based on the trade-off between quiescent curr ent consumption and interference immunity is stated below: ? follow eq.1 ? higher r reduces the qui escent current (path current = 1.25v/r2), however resistors beyond 5m ? are not recommended. ? lower r gives better noise immunity, and is less sensitive to interference, layout parasitics, fb node leakage, and improper probing to fb pins. ? a proper value of feed forward capacitor parallel with r1 can improve the noise immunity of the feedback loops, especially in an improper layout. an empirical suggestion is around 0~33pf for feedback resistors of m ? , and 10nf~0.1 f for feedback resistors of tens to hundreds k ? . for applications without standby or suspend modes, lower values of r1 and r2 are preferred. for applications concerning the current consumption in standby or suspend modes, the higher values of r1 and r2 are needed. such ?high impedance feedback loops? are sensitive to any interference, which require careful layout and avoid any interference, e. g. probing to fb pin. layout guide ? a full gnd plane without gap break. ? v dd to gnd noise bypass ? short and wide connection for the 1 f mlcc capacitor between pin5 and pin3. ? v in to gnd noise bypass ? add a capacitor close to l1 inductor, when v in is not an idea voltage source. ? minimized fb node copper area and keep far away from noise sources. ? minimized parasitic ca pacitance connecting to lx and ext nodes, which may cause additional switching loss. board layout example (2-layer board) (refer to typical application circuits figure 2. for the board) - top layer- - bottom layer - HT9266 9 of 13 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
typical application circuit HT9266 vdd ce ext lx fb gnd vin + c3 100uf l1 3.3~10uh c2 1uf r1 330k/1.6m/3m c1 100uf r2 270k/980k/1m vout 2.78v/3.3v/5v d1 1n5819 + figure1. HT9266 typical application for portable instruments HT9266 vdd ce ext lx fb gnd vin + c5 100uf l1 4.7uh cvdd 1uf c1 100uf r2 100k 12v/9v d1 1n5819 + q1 nmos r1 860k/620k c2 1uf 300ma rvdd 100 c4 0.1uf rm 0.22 3.1v~5v for 12v 2.8v~5v for 9v figure2. HT9266 high voltage applications HT9266 10 of 13 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
HT9266 vdd ce ext lx fb gnd vin + c3 100uf l1 3.3~10uh c2 1uf c1 100uf r2 980k/1m 3.3v/5v d1 1n5819 + q1 nmos r1 1.6m/3m vout figure3. HT9266 for higher current applications HT9266 vdd ce ext lx fb gnd vin c1 1uf l1 3.3~10uh r2 100k q1 nmos r1 620k c7 1uf r3 100 c2 10uf c6 0.1uf c8 1uf c3 10uf c4 10uf c5 10uf 3.3v/5v v out2 +18v 10ma v out1 +9v 100ma -9v 10ma v out3 figure4. HT9266 for multi-output applications HT9266 11 of 13 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
package sot- 26 surface mount package symbol dimensions in millimeters dimensions in inches min max min max a 0.889 1.295 0.035 0.051 a1 - 0.152 - 0.006 b 1.397 1.803 0.055 0.071 b 0.356 0.559 0.014 0.022 c 2.591 2.997 0.102 0.118 d 2.692 3.099 0.106 0.122 e 0.838 1.041 0.033 0.041 h 0.102 0.254 0.004 0.010 l 0.356 0.610 0.014 0.024 HT9266 12 of 13 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
5-lead sot-89 surface mount package symbol dimensions in millimeters dimensions in inches min max min max a 1.400 1.600 0.055 0.063 b 0.360 0.520 0.014 0.020 b 2.400 2.600 0.094 0.102 b1 0.406 0.533 0.016 0.021 c - 4.250 - 0.167 c1 0.800 - 0.031 - d 4.400 4.600 0.173 0.181 d1 - 1.700 - 0.067 e 1.400 1.600 0.055 0.063 h 0.380 0.430 0.014 0.017 HT9266 13 of 13 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification

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