SC508/SC508A EcoSpeed DC-DC Buck Controller with Integrated LDO POWER MANAGEMENT Features Description Power system The SC508/SC508A is a synchronous EcoSpeed buck reg- Input voltage 4.5V to 46V ulator which incorporates Semtechs advanced, patented Output voltage 0.6V to >85% x VIN adaptive on-time control architecture to provide excellent Integrated bootstrap switch light-load efficiency and fast transient response. It fea - Fixed 5V LDO output 200mA tures an integrated bootstrap switch and a xfi ed 5V LDO in 1% reference a 3 x 3(mm) package. The device is highly efficient and Selectable internal/external bias power supply uses minimal PCB area. The SC508A is available for auto- EcoSpeed architecture with pseudo-xfi ed fre - motive applications and is qualified to AEC-Q100. quency adaptive on-time control Logic input and output control The SC508 supports using standard capacitor types such as Independent control EN for LDO and switcher electrolytic or special polymer, in addition to ceramic, at switch- Programmable soft-start time ing frequencies up to 1MHz. The programmable frequency, Programmable V UVLO threshold IN Power Good output synchronous operation, and programmable power-save Selectable power-save mode for >80% effi- provide high ecffi iency operation over a wide load range. ciency under light load Programmable ultrasonic power-save mode Additional features include cycle-by-cycle current limit, SmartDriveTM for reduced EMI programmable soft-start, under and over-voltage protec- Protections tion, programmable over-current protection, start-up into Automatic restart on fault shutdown pre-biased output, automatic fault recovery (hiccup restart), Over-voltage and under-voltage soft-shutdown, selectable power-save modes, and pro- TC compensated R sensed current limit DS(ON) grammable ultrasonic power-save. The device also provides Thermal shutdown separate enable inputs for the PWM controller and LDO as Smart power-save well as a power good output for the PWM controller. Output Pre-bias start-up voltage range is 0.6 to 5V, with output voltages greater than Capacitor types: SP, POSCAP, OSCON, and ceramic 5V supported using additional components. Package 3 x 3(mm), 20-pin MLPQ Lead-free and halogen-free The input voltage can range from 4.5V to 46V. The wide RoHS and WEEE compliant input voltage range, programmable frequency, and inte- AEC-Q100 Qualified available in SC508A grated 5V LDO make the device extremely flexible and easy to use in a broad range of applications. Support is Applications provided for multi-cell battery systems in addition to tra- Office automation and computing ditional DC power supply applications. Networking and telecommunication equipment Point-of-load power supplies and module replacement Automotive applications Typical Application Circuit VEXT or VLDO VIN PGOOD PGOOD VIN CIN ENABLE EN DH SC508 ENL ENABLE LDO LX VOUT RTON SC508A L1 TON 3.3O + COUT BST VDDA VDDP ILIM VEXT or VLDO RLIM 0.1F 1F DL VOUT VLDO VLDO SS 1F 10nF FB PSV AGND PGND PSV 2012 Semtech Corporation Revision 4.3 1SC508/SC508A Pin Configuration Ordering Information Device Package (1)(2) SC508ULTRT MLPQ-UT20 (1)(2)(3) SC508AULTRT MLPQ-UT20 20 19 18 17 16 SC508EVB Evaluation Board Top View FB 1 15 PGOOD SC508AEVB Evaluation Board 14 PSV VOUT 2 Notes: AGND PAD 1) Available in tape and reel only. A reel contains 3000 devices. VDDA 3 13 VDDP 2) Lead-free packaging only. Device is WEEE and RoHS compliant VLDO 4 12 DL and halogen-free. 3) AEC-Q100 Qualified. 11 PGND VIN 5 6 7 8 9 10 MLPQ-UT20 Marking Information 508 508A yyww yyww xxxx xxxx yyww = Date Code yyww = Date Code xxxx = Semtech Lot Number xxxx = Semtech Lot Number 2 SS ENL TON NC BST AGND DH EN LX ILIM