SC418 TM EcoSpeed DC-DC Buck Controller with Programmable LDO POWER MANAGEMENT Features Description TM Power system The SC4 8 is a synchronous EcoSpeed buck regulator Input voltage 3V to 28V which incorporates Semtechs advanced, patented adap- Integrated bootstrap switch tive on-time control architecture to provide excellent Programmable LDO output 200mA light-load efficiency and fast transient response. It fea - % r eference tolerance -40 to +85 C tures an integrated bootstrap switch and programmable Selectable internal/external bias power supply LDO in a 3 x 3mm package. The device is highly efficient TM EcoSpeed architecture with pseudo-xfi ed fre - and uses minimal PCB area. quency adaptive on-time control The SC4 8 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 MHz. The programmable Programmable V UVLO threshold IN frequency, synchronous operation, and programmable Power good output power-save provide high efficiency operation over a wide Selectable power save mode load range. Programmable ultrasonic power save mode Protections Additional features include cycle-by-cycle current limit, Over-voltage/under-voltage soft-start, under and over-voltage protection, program- TC compensated R sensed current limit DS(ON) mable over-current protection, soft shutdown, selectable Thermal shutdown power-save modes, and programmable ultrasonic power- Smart power save save. The device also provides separate enable inputs for Output capacitor types the PWM controller and LDO as well as a power good High ESR SP, POSCAP, OSCON output for the PWM controller. Ceramic capacitors Package 3 x 3mm, 20-pin MLPQ The input voltage can range from 3V to 28V. The wide Lead-free and halogen free input voltage range, programmable frequency, and pro- RoHS and WEEE compliant grammable LDO make the device extremely flexible and Applications easy to use in a broad range of applications. Support is provided for single cell or multi-cell battery systems in Office automation and computing addition to traditional DC power supply applications. Networking and telecommunication equipment Point-of-load power supplies and module replacement Typical Application Circuit V E X T or V LD O V IN V IN P G O O D P G O O D C IN E N A B LE E N D H E N L E N A B LE LD O LX V O U T R TO N L1 TO N + C O U T V D D A B S T SC418 V D D P V E X T or V LD O ILIM R ILIM 0.1F 1F D L V LD O V O U T V LD O 1F FB L FB P S V A G N D P G N D P S V Semtech Corporation Rev 2.0 SC418 Pin Configuration Ordering Information Device Package ()(2) SC4 8ULTRT MLPQ-UT20 SC48E VB Evaluation Board 20 19 18 17 16 Notes: Top View ) Available in tape and reel only. A reel contains 3000 devices. FB 1 15 P G O O D 2) Lead-free packaging only. Device is WEEE and RoHS compliant FB L 2 14 P S V and halogen-free. A G N D P A D V D D A 3 13 V D D P V O U T 12 D L 4 11 P G N D N C 5 6 7 8 9 10 MLPQ-UT20 Marking Information 418 yyw w xxxx yyww = Date Code xxxx = Semtech Lot Number 2 V IN E N L V LD O T O N B S T A G N D D H E N LX ILIM