SC4510 Datasheet | SEMTECH

Description 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 Features u Synchronous buck operation with current sink or u u u u u u u u u source without loss of regulation Output can track internal or external reference Buffered reference output from external reference bi-Sense mode lossless current sensing 2.5V to 16V operation with 4.75V minimum VCC Direct drive for high side N-channel MOSFETs with diode and capacitor bootstrap Undervoltage lockout, Soft Start, Enable and Power Good functions Fast transient response with external pensation Current mode control with transconductance error amplifier Programmable oscillator frequency with external sync 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 pensation functions are provided to ensure high degree of integration and low external ponent count. Semetch’s patented bi-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. Applications u Externally referenced buck convertors u DDR memory terminators u Point of use power supplies Typical Application Circuit VIN 15V MAX C1 C2 D1 Q1 R1 L1 C3 VOUT 0.5V MIN Q2 C4 C5 R2 R3 C6 R4 C7 SYNC 20 19 18 17 16 15 14 13 12 11 SS/EN IN- AGND SYNC ROSC R5 REFOUT PGOOD AVCC PVCC CS+ CS- U1 PGND...