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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC461 датащи(PDF) 1 Page - Semtech Corporation |
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SC461 датащи(HTML) 1 Page - Semtech Corporation |
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1 / 31 page  © 2012 Semtech Corporation 1 SC461 EcoSpeed®DC-DC Buck Controller with Integrated LDO Features Power system Input voltage — 3V to 28V 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 enable controls for LDO and switcher Programmable soft-start time Programmable V IN UVLO threshold Power Good output Selectable 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 Applications Office automation and computing Networking and telecommunication equipment Point-of-load power supplies and module replacement • • • • • • • • • • • • • • • • • Description The SC461 is a synchronous EcoSpeed® buck regulator which incorporates Semtech’s advanced, patented adap- tive on-time control architecture to provide excellent light-load efficiency and fast transient response. It fea- tures 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 SC461 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, and a selectable power-save mode. 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 3V to 28V. 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 2.0 POWER MANAGEMENT Typical Application Circuit VDDA PGOOD EN TON ENL 1µF VEXT or VLDO PGND AGND VLDO ENABLE LDO RTON SC461 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 |
Аналогичный номер детали - SC461 |
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Аналогичное описание - SC461 |
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