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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SC508A 데이터시트(PDF) 1 Page - Semtech Corporation |
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SC508A 데이터시트(HTML) 1 Page - Semtech Corporation |
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1 / 32 page  © 2011 Semtech Corporation 1 SC508/SC508A EcoSpeed®DC-DC Buck Controller with Integrated LDO Features Power system Input voltage — 4.5V to 46V Integrated bootstrap switch Fixed 5V LDO output — 200mA 1% reference tolerance -40 to +85 °C Selectable internal/external bias power supply EcoSpeed® architecture with pseudo-fixed fre- quency adaptive on-time control Logic input and output control Independent control EN for LDO and switcher Programmable soft-start time Programmable V IN UVLO threshold Power Good output Selectable power-save mode Programmable ultrasonic power-save mode Protections Automatic restart on fault shutdown Over-voltage and under-voltage TC compensated R DS(ON) sensed current limit Thermal shutdown Smart power-save Pre-bias start-up Capacitor types: SP, POSCAP, OSCON, and ceramic Package — 3 x 3(mm), 20-pin MLPQ Lead-free and halogen-free RoHS and WEEE compliant AEC-Q100 Qualified available in SC508A Applications Office automation and computing Networking and telecommunication equipment Point-of-load power supplies and module replacement Automotive applications • • • • • • • • • • • • • • • • • • Description The SC508/SC508A is a synchronous EcoSpeed®buck reg- ulator which incorporates Semtech’s advanced, patented adaptive `on-time control architecture to provide excel- lent light-load efficiency and fast transient response. It features an integrated bootstrap switch and a fixed 5V LDO in a 3 x 3(mm) package. The device is highly efficient and uses minimal PCB area. The SC508A is available for automotive applications and is qualified to AEC-Q100. The SC508 supports using standard capacitor types such as electrolyticorspecialpolymer,inadditiontoceramic,atswitch- ing frequencies up to 1MHz. The programmable frequency, synchronous operation, and programmable power-save provide high efficiency operation over a wide load range. Additional features include cycle-by-cycle current limit, programmable soft-start, under and over-voltage protec- tion, programmable over-current protection, start-up into pre-biased output, automatic fault recovery (hiccup restart), soft-shutdown, selectable power-save modes, and pro- grammable ultrasonic power-save. The device also provides separate enable inputs for the PWM controller and LDO as well as a power good output for the PWM controller. Output voltage range is 0.6 to 5V, with output voltages greater than 5V supported using additional components. The input voltage can range from 5V to 46V. The wide input voltage range, programmable frequency, and inte- grated 5V LDO make the device extremely flexible and easy to use in a broad range of applications. Support is provided for multi-cell battery systems in addition to tra- ditional DC power supply applications. Revision 4.1 POWER MANAGEMENT Typical Application Circuit VDDA PGOOD EN TON ENL 1µF VEXT or VLDO PGND AGND VLDO ENABLE LDO RTON SC508 SC508A VDDP VLDO SS 0.1µF 1µF ENABLE PGOOD PSV PSV LX ILIM RLIM + VOUT COUT L1 VOUT FB CIN DH BST DL VIN VIN VEXT or VLDO 10nF 3.3O |
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