high efficiency 1mhz, 2a step up regulator preliminary specification 1 general description the sy7208 is a high efficiency boost regulators targeted for general stepup applications. ordering information temperature code optional spec code ( ) package code temperature code optional spec code ( ) package code temperature range: 40c to 85c features wide input range: 325v bias input, 25vout max 1mhz switching frequency minimum on time: 100ns typical minimum off time: 100ns typical low r ds(on) : 150m rohs compliant and halogen free accurate reference: 0.6v ref compact package: sot23 6 pins applications wled drivers networking cards powered from pci or pci express slots typical applications in gnd fb v in c in l c out r 1 r 2 v out lx en figure 1. schematic diagram figure 2. efficien cy vs load current ordering number package type note sy7208abc sot236 2a AM9208 AM9208 AM9208 AM9208 tel:0755-36848411 http://www.sz-xiangshuo.com fax:0755-29765461 free datasheet http://www.0pdf.com
2 pinout (top view) sot236 top mark: ca xyz ( device code: ca, x=year code, y=week code, z= lot number code ) pin name pin number pin description in 5 input pin. 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). en 4 enable control. high to turn on the part. dont l eave it floated. nc 6 no connection. absolute maximum ratings (note 1) lx, in, en 26v all other pins 4v power dissipation, p d @ t a = 25c sot236 0.6w package thermal resistance (note 2) ja 161c/w jc 130c/w junction temperature range 125c 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 dynamic lx voltage in 50ns duration in+3v to gnd4v recommended operating conditions (note 3) input voltage supply 3v to 25v junction temperature range 40c to 125c ambient temperature range 40c to 85c AM9208 AM9208 tel:0755-36848411 http://www.sz-xiangshuo.com fax:0755-29765461 free datasheet http://www.0pdf.com
3 electrical characteristics (v in = 5v, v out =12v, i out =100ma, t a = 25c unless otherwise specified) parameter symbol test conditions min typ max unit input voltage range v in 3 25 v quiescent current i q v fb =0.66v 100 a shutdown current i shdn en=0 1 5 a low side main fet ron rds(on) 150 m main fet current limit i lim1 2 2.6 a switching frequency fsw 0.8 1 1.2 mhz feedback reference voltage v ref 0.588 0.6 0.612 v in uvlo rising threshold v in,uvlo 2.7 v uvlo hysteresis u vlo,hys 0.1 v thermal shutdown temperature t sd 150 c en rising threshold v enh 2 v en falling threshold v enl 0.4 v en pin input current i en 0 100 na 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 t a = 25c on a low effective single layer thermal con ductivity test board of jedec 513 thermal measurement standa rd. test condition: device mounted on 2 x 2 fr4 substrate pcb, 2oz copper, with minimum recommended pad on to p layer and thermal vias to bottom layer ground pla ne. note 3: the device is not guaranteed to function outside it s operating conditions. note 4: ic could be start up in 2.7v. AM9208 tel:0755-36848411 http://www.sz-xiangshuo.com fax:0755-29765461 free datasheet http://www.0pdf.com
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 & me tal burr. AM9208 tel:0755-36848411 http://www.sz-xiangshuo.com fax:0755-29765461 free datasheet http://www.0pdf.com
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