SC402B 10A EcoSpeed Integrated FET Regulator with Programmable LDO POWER MANAGEMENT Features Description Power System The SC402B is a stand-alone synchronous EcoSpeed buck Input voltage 3V to 28V power supply which incorporates Semtechs advanced Bias voltage 3V to 5.5V LDO or external patented adaptive on-time control architecture. This pro- Up to 96% peak efficiency 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 Reference tolerance 1% T = -40 to +125 C J package. The device is highly efficient and uses minimal Programmable soft start time PCB area. The SC402B has the same package and pin con- Logic Input/Output Control figuration as the entire SC40x series for compatibility. Independent EN controls for LDO and switcher Programmable V UVLO threshold The SC402B supports using standard capacitor types such IN Power good output as electrolytic or specialty polymer, in addition to ceramic, Selectable PSAVE or FCM mode at switching frequencies up to 1MHz. The programmable Protection frequency, synchronous operation, and selectable power- Over-voltage and under-voltage save provide high efficiency operation over a wide load TC compensated R sensed current limit range. DS(ON) Thermal Shutdown Output Capacitor Types Additional features include a programmable soft-start, High ESR SP, POSCAP, OSCON programmable cycle-by-cycle over-current limit protec- Ceramic capacitors tion, under-voltage and over-voltage protection, soft Package shutdown, and selectable power-save operation. The Lead-free package 5x5mm, 32-Pin MLPQ device also provides separate enable inputs for the PWM RoHS/WEEE compliant and Halogen free controller and LDO as well as a power good output for the PWM controller. Applications The wide input and programmable frequency make the Networking and telecommunication equipment device extremely flexible and easy to use in a broad range Printers, DSL, and STB applications of applications. Embedded systems and power supply modules Point of load power supplies Typical Application Circuit ENABLE/PSAVE EN/PSV ILIM RILIM LXS ENABLE LDO ENL RTON PGOOD PGOOD TON VOUT L1 10 VDD SC402B VEXT/LDO VOUT LX 1F CSOFT COUT SS + RFB1 BST FB VIN VIN RFB2 CIN CBST 2011 Semtech Corporation Rev. 2.1 1 LXBST AGND PGNDSC402B Pin Configuration Ordering Information Device Package (1)(2) SC402BMLTRT MLPQ-32 5X5 32 31 30 29 28 27 26 25 SC402BEVB Evaluation Board Top View 1 24 LX FB Notes: 23 VOUT 2 LX 1) Available in tape and reel only. A reel contains 3000 devices. AGND PAD 1 3 22 VDD PGND 2) Lead-free, Halogen free, and RoHS/WEEE compliant 4 21 AGND PGND LX PAD 3 FBL 5 20 PGND VIN 6 19 PGND VIN PAD 2 7 18 SS PGND 8 17 PGND BST 9 10 11 12 13 14 15 16 SC402B MLPQ-32 5x5, 32 LEAD Marking Information SC402B yyww xxxxxx xxxxxx yyww = Date Code xxxxxx = Semtech Lot Number xxxxxx = Semtech Lot Number 2 VIN ENL VIN TON VIN AGND DH EN/PSV LXBST LXS DL ILIM PGND PGOOD PGND LX