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SC4510ITSTRT Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4510ITSTRT Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 16 page  1 www.semtech.com SC4510 High Performance Synchronous Buck Controller With Reference Tracking POWER MANAGEMENT United States Patent #6,441,597 Features Applications Revision: Jan 0 7, 2005 Typical Application Circuit Description u Synchronous buck operation with current sink or source without loss of regulation u Output can track internal or external reference u Buffered reference output from external reference u Combi-Sense mode lossless current sensing u 2.5V to 16V operation with 4.75V minimum V CC u Direct drive for high side N-channel MOSFETs with diode and capacitor bootstrap u Undervoltage lockout, Soft Start, Enable and Power Good functions u Fast transient response with external compensation u Current mode control with transconductance error amplifier u Programmable oscillator frequency with external sync u Externally referenced buck convertors u DDR memory terminators u Point of use power supplies The SC4510 can be configured as a synchronous buck convertor capable of sourcing and sinking current from load without losing output regulation. The output can be set to track an internal reference or an external voltage. The actual reference used by the error amplifier is buffered and brought out as a reference. It is the ideal choice for externally referenced or tracking buck convertors such as those for DDR memory applications. The controller is also designed for point of use DC-DC convertors with 2.5-16V power sources with a Vcc of 4.5V or higher. Soft start, current limit, programmable oscillator and external compensation functions are provided to ensure high degree of integration and low external component count. Semetch’s patented Combi-Sense™ technique is utilised for lossless current sening and maximising efficiency. Both high and low side MOSFET drivers are built in and rated for substantial peak currents to minimise switching losses. The SC4510 is offered in a space saving TSSOP-20 package. C1 C7 C2 C6 C11 R3 R7 R6 Q1 Q2 L1 REFOUT PGOOD SYNC D1 C8 C12 RTN R5 C10 C5 C4 C3 VOUT R2 0.5V MIN EXT REF INT REF RTN 15V MAX C9 C13 U1 SC4510 R1 R4 IN+ VIN |
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