SC493 TM EcoSpeed Step-down Controller 2 with I C Interface POWER MANAGEMENT Features Description TM Input supply voltage range 3.0V to 28V The SC493 is a synchronous EcoSpeed buck power supply 2 Controller supply voltage range 3.0V to 5.5V controller. It features an I C interface and a bootstrap switch in All ceramic solution enabled a space-saving MLPQ 3X3-20 pin package. The SC493 uses 2 I C interface Semtechs advanced patented adaptive on-time control archi- Output voltage fine adjust control tecture to provide excellent light load ecffi iency and fast tran - Output voltage margining sient response with small external components. 2 Supports dynamic voltage transitions via the I C 2 The I C interface is used to program the output voltage interface offset, the power-on delay time, the soft-start time, the Programmable power-on delay time and soft-start time TM power save operating mode, and it can enable/disable the EcoSpeed architecture with pseudo xfi ed-frequency controller. Additionally, a status register provides informa- adaptive on-time control tion on device state and faults. Switching frequency programmable up to 1MHz Selectable power save, including ultrasonic The controller is capable of operating with all ceramic solu- Non-synchronous start-up into pre-biased loads tions and switching frequencies up to 1MHz. The program- Over-voltage/under-voltage fault protection mable frequency and selectable power save mode oeff r the Smart power save efl xibility to optimize the controller for high ecffi iency and Power good Output TM small size. The power save mode can be enabled to maximize Smart drive ecffi iency over the entire load range (PSAVE), or switched to Status register monitoring device operation ultrasonic mode to set the minimum frequency to the desired Ultra-thin package 3 x 3 x 0.6 (mm), 20 pin MLPQ-UT value (UPSAVE). Power save mode can be disabled for opera- Lead-free and halogen-free tion in continuous conduction mode at all loads. WEEE and RoHS compliant Additional features include output voltage margining, Applications cycle-by-cycle current limit, output voltage soft-start, over and under-voltage protection, controller over-tempera- Printers ture protection, and output voltage soft-shutdown when Computer peripherals disabled. The SC493 also provides a power good output. Typical Application Circuit VIN VDD Q1 CIN R1 R2 R3 RILIM BST EN EN L CBST LX VOUT PGD PGD SC493 SCL SCL SDA SDA R4 A0 COUT Q2 DL A1 A2 R5 US Patent: 7,714,547 B2 June 10, 2010 2010 Semtech Corporation 1 AVDD AGND PVDD FB VIN VOUT DH PGND ILIMSC493 Pin Configuration Ordering Information Device Package (1)(2) SC493ULTRT MLPQ-UT-20 3X3 SC493EVB Evaluation Board 20 19 18 17 16 Notes: VOUT 1 15 PGOOD (1) Available in tape and reel only. A reel contains 3,000 devices. TOP VIEW FB 2 14 PVDD (2) Lead-free packaging only. Device is WEEE and RoHS compliant, and halogen-free. AVDD 3 13 PGND SDA 12 DL 4 PAD 11 NC SCL 5 6 7 8 9 10 MLPQ-UT-20 3X3, 20 LEAD =40C/W JA Marking Information 493 yyww xxxxx yyww = Date Code xxxxx = Semtech Lot No. Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. 2 EN AGND VIN A0 DH A1 BST A2 LX ILIM