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SC403B Datasheet(PDF) 1 Page - Semtech Corporation |
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SC403B Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 32 page  © 2011 Semtech Corporation 1 SC403B 6A EcoSpeed® Integrated FET Regulator with Programmable LDO Features Power System: Input voltage — 3V to 28V Internal or external bias voltage — 3V to 5.5V Reference Voltage — 600mV Integrated bootstrap switch Programmable LDO output — 200mA 1% reference tolerance -40 to +85 °C EcoSpeed® architecture with pseudo-fixed fre- quency adaptive on-time control Logic Input/Output Control: Independent control EN for LDO and switcher Programmable V IN UVLO threshold Power good output Selectable power save mode Programmable soft start time Protections: Over-voltage and under-voltage TC compensated R DS(ON) sensed current limit Thermal shutdown Any ESR — SP, POSCAP, OSCON, and ceramic capacitors Package: Lead-free package — 5x5mm, 32-pin MLPQ Fully RoHS/WEEE compliant and halogen-free Applications Office automation and computing Networking and telecommunication equipment Point of load power supplies and module replacement • • • • • • • • • • • • • • • • • Description The SC403B is a stand-alone synchronous EcoSpeed® buck power supply which incorporates Semtech’s advanced patented adaptive on-time control architecture. It pro- vides excellent light-load efficiency and fast transient response. It features integrated power MOSFETs, a boot- strap switch, and a programmable LDO in a 5x5mm package. The device is highly efficient and uses minimal PCB area. The SC403B supports using standard capacitor types such as electrolytic or special polymer, in addition to ceramic, at switching frequencies up to 1MHz. The programmable frequency, synchronous operation, and selectable power- save provide high efficiency operation over a wide load range. Additional features include a programmable soft-start, programmable cycle-by-cycle over-current limit protec- tion, under and over-voltage protections, soft shutdown, and selectable power-save. The device also provides sep- arate enable inputs for the PWM controller and LDO as well as a power good output for the PWM controller. The wide input and bias voltage ranges, programmable frequency, and programmable LDO make the device extremely flexible and easy to use in a broad range of applications. The SC403B can be used in server computers and single cell or multi-cell battery systems in addition to traditional DC power supply applications. Rev. 2.1 POWER MANAGEMENT RTON SC403B FB VOUT VDD VIN SS BST LX PGOOD LXS ENL RILIM CBST ENABLE/PSAVE ENABLE LDO VEXT/LDO + RFB1 RFB2 VOUT COUT L1 CIN VIN PGOOD TON 1µF CSOFT 10Ω Typical Application Circuit US Patent: 2010/0033215A1 |
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