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SC493 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC493 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 28 page  © 2010 Semtech Corporation SC493 EcoSpeedTM Step-down Controller with I2C Interface POWER MANAGEMENT 1 Features Input supply voltage range — 3.0V to 28V Controller supply voltage range — 3.0V to 5.5V All ceramic solution enabled I2C interface Output voltage fine adjust control Output voltage margining Supports dynamic voltage transitions via the I2C interface Programmable power-on delay time and soft-start time EcoSpeedTM architecture with pseudo fixed-frequency adaptive on-time control Switching frequency programmable up to 1MHz Selectable power save, including ultrasonic Non-synchronous start-up into pre-biased loads Over-voltage/under-voltage fault protection Smart power save Power good Output Smart driveTM Status register monitoring device operation Ultra-thin package — 3 x 3 x 0.6 (mm), 20 pin MLPQ-UT Lead-free and halogen-free WEEE and RoHS compliant Applications Printers Computer peripherals Description The SC493 is a synchronous EcoSpeedTM buck power supply controller. It features an I2C interface and a bootstrap switch in a space-saving MLPQ 3X3-20 pin package. The SC493 uses Semtech’s advanced patented adaptive on-time control archi- tecture to provide excellent light load efficiency and fast tran- sient response with small external components. The I2C interface is used to program the output voltage offset, the power-on delay time, the soft-start time, the power save operating mode, and it can enable/disable the controller. Additionally, a status register provides informa- tion on device state and faults. The controller is capable of operating with all ceramic solu- tions and switching frequencies up to 1MHz. The program- mable frequency and selectable power save mode offer the flexibility to optimize the controller for high efficiency and small size.The power save mode can be enabled to maximize efficiency over the entire load range (PSAVE), or switched to ultrasonic mode to set the minimum frequency to the desired value (UPSAVE). Power save mode can be disabled for opera- tion in continuous conduction mode at all loads. Additional features include output voltage margining, cycle-by-cycle current limit, output voltage soft-start, over and under-voltage protection, controller over-tempera- ture protection, and output voltage soft-shutdown when disabled. The SC493 also provides a power good output. A0 LX PGD SC493 CIN L COUT VOUT SCL SDA A1 A2 DL CBST BST Q2 R3 R2 R1 Q1 RILIM R4 R5 EN VIN PGD SCL SDA EN VDD Typical Application Circuit June 10, 2010 US Patent: 7,714,547 B2 |
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