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| CYT2606L 1 o f 1 pfm s t ep-up dc-dc converter general description the CYT2606L series are pfm step-up dc-dc converters with very low ripple noise due to the high operation frequency . the m a xim u m operation frequency is 400khz. only three com ponents are required to realize the conversion from the battery voltage to a selected output voltage. a driver pin (ext) is provided for driving extern al po wer trans i stor to exten d the outp u t current capability where lar g e current is required. enable pin (en) is also provided so that the circuit can be powered down. ordering information featur es 400khz maxim u m operation frequency 2.0v to 5.0v output voltage w ith 0.1v step low start-up voltage: 0.8v at 1m a 2% output voltage accuracy up to 88% efficiency output current: 300m a 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 cam eras, cam corders, vcrs, pdas, pagers and hand held com m unication instrum e nt t y pical applications
CYT2606L 2 o f 2 block diagram c b o e h b q 1 ' . d p o u s p m 0 4 $ , ) [ c v g g f s & s s p s $ v s s f o u m j n j u j o h d p n q b s b u p s " n q m j g j f s 7 0 6 5 - 9 & 9 5 & / $ i j q & o b c m f ( / % 7 pin assignment part marking and package t y pe pin name c y t 2606 l lxxt sot - 23- 3 c y t 2606 l lxxf sot - 23- 5 c y t 2606 l lxxe sot - 89 c y t 2606 l exxt sot - 23- 3 c y t 2606 l exxf sot - 23- 5 c y t 2606 l exxe sot - 89 description lx 2 5 3 - - - swi t c hi n g pi n ex t - - - 2 5 3 b u f f er out put for ext e rnal t r ansi st or vo u t 3 2 2 3 2 2 out put vol t a g e en - 1 - - 1 - chip enable (active high) gnd 1 4 1 1 4 1 g r o u n d nc - 3 - - 3 - no connect i o n CYT2606L 3 of 3 absolute maximum rating s type symbol description value unit vmax maximum voltage on vout and vlx pins 8 v voltage vmin-max voltage range on ext and en pins -0.3-vout+0.3 v ilxmax maximum current on lx pin 1000 ma current iextmax maximum current on ext pin 100 ma psot-23-3 maximum power dissipation for sot-23-3 package 0.25 w psot-23-5 maximum power dissipation for sot-23-5 package 0.25 w power dissipation psot-89 maximum power dissipation for sot-89 package 0.5 w tmin-max operation temperature range -20-85 o c thermal tstorage storage temperature range -40-165 o c esd vesd esd voltage for human body mode 2000 v electronic characteristics parameter symbol test condition min typ max unit output voltage accuracy ?vout -2 2 % maximum input voltage vin max 0.7 vout v start-up voltage v start iload=1ma, vin:0 1 2v 0.85 v hold-on voltage v hold iload=1ma, vin:2 1 0v 0.6 v maximum oscillation frequency f max 350 400 450 khz oscillator duty cycle dc osc 75 80 85 % efficiency + 85 88 % current limit * - * . * 5 600 800 1000 ma vin=1.8v vout=3.0v 20 ua input current at no load * * / vin=1.8v vout=5.0v 25 ua input standby current * * / 2 no load, en= ? low? 1 ua en ?high? voltage level 0.4 vout v en ?low? level 0.2 v en ?high? input current 0.1 ua en ?low? input current -0.1 ua ext output current -5 5 ma CYT2606L 4 o f 4 t y pical characteristics (using internal switch t r ansistor) s t a r t - up/ h o l d -o n v s . o u t put curre n t o u t put curre n t (m a ) 4 u b s u v q ) p m e p o 7 p m u b h f 7 4 u b s u v q ) p m e p o l = 47u h c = 47u f o u tp ut v o lta ge vs . o u tp ut cur r e nt ou t p u t c u rre n t (m a ) 0 v u q v u 7 p m u b h f 7 7 7 7 7 7 l = 47u h c = 47u f vo ut= 3 . 4 v CYT2606L 5 o f 5 e f f i c i e n c y v s . o u t put curre n t o u t put curre n t (m a ) & g g j d j f o d z l = 47u h c = 47u f v o u t =3.4v 7 7 7 7 7 o utput current vs. ripple v oltage o utput current (m a ) 3 j q q m f 7 p m u b h f n 7 l=47uh c=47uf vout=3 .4 v 7 7 7 7 7 CYT2606L 6 o f 6 o u t put c u rre n t v s . r i ppl e v o l t a g e o u t put c u rren t (ma ) 3 j q q m f 7 p m u b h f n 7 l = 47u h c = 2* 47u f v o u t =3.4v 7 7 7 7 7 output c u r r e n t v s . r i ppl e v o l t a g e output c u r r e n t ( m a ) 3 j q q m f 7 p m u b h f n 7 l = 47u h c = 3* 47u f v o u t =3.4v 7 7 7 7 7 CYT2606L 7 o f7 package information . j o . b y . j o . b y " " " # d % & & f f - - [ [ [ [ 3 & ' 3 & ' 4 z n c p m % j n f o t j p o t * o . j m m j n f u f s t % j n f o t j p o t * o * o d i f t 5 : 1 5 : 1 cyt2606 l 8 o f 8 . j o . b y . j o . b y " c c d % % & & f f - 4 z n c p m 3 & ' 3 & ' 5 : 1 5 : 1 5 : 1 5 : 1 |
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