SC403B 6A EcoSpeed Integrated FET Regulator with Programmable LDO POWER MANAGEMENT Features Description Power System: The SC403B is a stand-alone synchronous EcoSpeed buck Input voltage 3V to 28V power supply which incorporates Semtechs advanced Internal or external bias voltage 3V to 5.5V patented adaptive on-time control architecture. It pro- Reference Voltage 600mV vides excellent light-load efficiency and fast transient Integrated bootstrap switch response. It features integrated power MOSFETs, a boot- Programmable LDO output 200mA strap switch, and a programmable LDO in a 5x5mm 1% reference tolerance -40 to +85 C package. The device is highly efficient and uses minimal EcoSpeed architecture with pseudo-fixed fre - PCB area. quency adaptive on-time control The SC403B supports using standard capacitor types such Logic Input/Output Control: as electrolytic or special polymer, in addition to ceramic, at Independent control EN for LDO and switcher switching frequencies up to 1MHz. The programmable Programmable V UVLO threshold IN frequency, synchronous operation, and selectable power- Power good output save provide high efficiency operation over a wide load Selectable power save mode range. Programmable soft start time Protections: Additional features include a programmable soft-start, Over-voltage and under-voltage programmable cycle-by-cycle over-current limit protec- TC compensated R sensed current limit DS(ON) tion, under and over-voltage protections, soft shutdown, Thermal shutdown and selectable power-save. The device also provides sep- Any ESR SP, POSCAP, OSCON, and ceramic capacitors arate enable inputs for the PWM controller and LDO as Package: well as a power good output for the PWM controller. Lead-free package 5x5mm, 32-pin MLPQ Fully RoHS/WEEE compliant and halogen-free The wide input and bias voltage ranges, programmable Applications frequency, and programmable LDO make the device extremely flexible and easy to use in a broad range of Office automation and computing applications. The SC403B can be used in server computers Networking and telecommunication equipment and single cell or multi-cell battery systems in addition to Point of load power supplies and module replacement traditional DC power supply applications. Typical Application Circuit ENABLE/PSAVE RILIM ENABLE LDO ENL LXS RTON TON PGOOD PGOOD VOUT 10 VDD VEXT/LDO L1 VOUT LX SC403B 1F CSOFT COUT + SS RFB1 BST FB RFB2 VIN VIN CIN CBST US Patent: 2010/0033215A1 2011 Semtech Corporation Rev. 2.1 1 LXBST EN/PSV AGND ILIM PGNDSC403B Pin Configuration Ordering Information Device Package (1)(2) SC403BMLTRT MLPQ-32 5X5 32 31 30 29 28 27 26 25 SC403BEVB Evaluation Board Top View 1 24 FB LX 23 VOUT 2 LX AGND PAD 1 VDD 3 22 PGND Notes: AGND 4 21 PGND 1) Available in tape and reel only. A reel contains 3000 devices. LX PAD 3 2) Lead-free package only. Device is RoHS/WEEE compliant and FBL 5 20 PGND halogen-free. 6 19 PGND VIN VIN PAD 2 7 18 SS PGND 8 17 BST PGND 9 10 11 12 13 14 15 16 SC403B MLPQ-32 5x5, 32 LEAD Marking Information SC403B yyww xxxxxx xxxxxx yyww = Date Code xxxxxx = Semtech Lot Number xxxxxx = Semtech Lot Number 2 VIN ENL VIN TON VIN AGND NC EN/PSV LXBST LXS NC ILIM PGND PGOOD PGND LX