SY7208/SY7208b high efficiency 1mhz, 2a step up regulator SY7208/b rev. # 0.6 silergy corp. confidentia l- prepared for customer use only 1 general description the SY7208 and SY7208b are high efficiency boost regulators targeted for general step-up application s. SY7208b incorporates input over-voltage protection and turn off the regulator when the input voltage exceeds 7v. ordering information temperature code c: - 40 c~85 c package code: ab: sot23-6 spec code none: 0.6 v ref b: 1v ref SY7208 ( ) features wide input range: 3-25v bias input, 25vout max 1mhz switching frequency minimum on time: 100ns typical minimum off time: 100ns typical low rdson: 0.2ohm programmable softstart: SY7208b 7v input ovp protection: SY7208b accurate reference: o SY7208, 0.6v ref o SY7208b: 1v ref compact package: sot23 6 pins applications wled drivers networking cards powered from pci or pci- express slots typical applications in1,2 gnd fb ss v in c in l c out r 1 r 2 v out lx fig. 1 typical schematic diagram free datasheet http://www.0pdf.com
SY7208/SY7208b SY7208/b rev. # 0.6 silergy corp. confidentia l- prepared for customer use only 2 pinout (sot23-6 top view) lx gnd fb en nc in 12 3 64 5 lx gnd fb ss in1 in2 12 3 64 5 (SY7208) (SY7208b) top mark: ca xyz for SY7208 bl xyz for SY7208b ( device code: cafor SY7208 and bl for SY7208b, x=year code, y=week code, z=wafer lot number code) pin name sot23-6 pin description in(SY7208) 5 input pin. decouple this pin to gnd pi n with 1uf ceramic cap. in1,2(SY7208b) 6,5 input pins. decouple this pin to gnd pin with 1 uf ceramic cap. gnd 2 ground pin lx 1 inductor node. connect an inductor between in pin and lx pin. fb 3 feedback pin. connect a resistor r1 between v out and fb, and a resistor r2 between fb and gnd to program the outpu t voltage: v out =0.6v*(r1/r2+1)SY7208; vout=1v*(r1/r2+1) SY7208b. ss (SY7208b) 4 external softstart pin. add a capacitor to this p in to program the softstart time to limit the inrush current. for sy7 208b, pull this pin to in can disable the input ovp. en (SY7208) 4 enable control. high to turn on the part. dont l eave it floated. absolute maximum ratings (note 1) out, lx, in, sen-------------------------- -------- --------------------------------------------- 26v all other pins-------------------------- ---------- -------------------------------------------------- 6v power dissipation, p d @ t a = 25c sot-23-6, ---------------------------------- ----------- 0.4w package thermal resistance (note 2) ja --------------------------------------------------- ------------------------------------ 250c/w jc --------------------------------------------------- ------------------------------------ 130c/w junction temperature range ------------------------ ------------------------------------------- 150c lead temperature (soldering, 10 sec.) ------------- ------------------------------------------ 260c storage temperature range ------------------------- ------------------------------------------- - 65c to 150c esd susceptibility (note 2) hbm (human body mode) ----------------------------- -----------------------------------------2kv mm (machine mode) --------------------------------- ------------------------------------------- 200v recommended operating conditions (note 3) in1,2, lx ----------------------------------------- ------------------------------------------------- 3 v to 25v all other pins ------------------------------------ -------------------------------------------------- 0-5.5v junction temperature range ------------------------ ------------------------------------------ -40c t o 125c ambient temperature range ------------------------- ----------------------------------------- - 40c to 85c free datasheet http://www.0pdf.com
SY7208/SY7208b SY7208/b rev. # 0.6 silergy corp. confidentia l- prepared for customer use only 3 electrical characteristics (v in = 5v, vout=12v, iout=100ma, t a = 25c unless otherwise specified) parameter symbol test conditions min typ max unit input voltage range vin 3 25 v quiescent current i q fb=0.66v 100 a low side main fet ron rds(on)1 200 m main fet current limit i lim1 2 2.6 a switching frequency fsw 0.8 1 1.2 mhz SY7208 0.588 0.6 0.612 v feedback reference voltage vref SY7208b 0.98 1 1.02 v in ovp rising threshold v in,ov SY7208b only 7 v in ovp hysteresis v ov,hys SY7208b only 0.3 v in uvlo rising threshold v in, uvlo 2.7 v uvlo hysteresis uvlo, hys 0.1 v thermal shutdown temperature t sd 150 c note 1 : stresses listed as the above absolute maximum ra tings may cause permanent damage to the device. these are for stress ratings. functional operation of the device at these or any other conditions beyo nd those indicated in the operational sections of the specif ications is not implied. exposure to absolute maxim um rating conditions for extended periods may remain possibil ity to affect device reliability. note 2 : ja is measured in the natural convection at ta = 25 c on a low effective single layer thermal conductivity test board of jedec 51-3 thermal measu rement standard. note 3: the device is not guaranteed to function outside it s operating conditions. free datasheet http://www.0pdf.com
SY7208/SY7208b SY7208/b rev. # 0.6 silergy corp. confidentia l- prepared for customer use only 4 sot23-6 package outline & pcb layout design 0.95 2.40 1.90 0.60 1.00 0.95 2.40 1.90 0.60 1.00 1.50 - 1.70 0.30 - 0.50 2.80 - 3.10 2.70 - 3.00 1.50 - 1.70 0.30 - 0.50 2.80 - 3.10 2.70 - 3.00 recommended pad layout 0.1 - 0.15 0.25 ref 0.3 - 0.6 0.1 - 0.15 0.25 ref 0.3 - 0.6 1.0 - 1.3 0.01 - 0.1 1.90 typ 0.95 typ 1.0 - 1.3 0.01 - 0.1 1.90 typ 0.95 typ notes: all dimensions are in millimeters. all dimensions dont include mold flash & metal bu rr. free datasheet http://www.0pdf.com
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