SC1485 Datasheet PDF | Semtech Corporation

Semtech Corporation SC1485

The SC1485 is a dual output constant on synchronousbuck PWM controller intended for use in notebook computers and other battery operated portable devices. The excellent transient response, means that SC1485 based solutions will require less output capacitance than competing fixed frequency converters. The frequency is constant until a step in load or line voltage occurs at which time the pulse density and frequency will increase or decrease to counter the change in output or input voltage.

Part No.	SC1485
Datasheet	SC1485 Download
Manufacturer	Semtech Corporation
Description	Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller
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DESCRIPTION

FEATURES

include high efficiency and a fast dynamic response with no minimum on time. After the transient event, the controller frequency will return to steady state operation. At light loads, Power-Save Mode enables the SC1485 to skip PWM pulses for better efficiency. Each output voltage can be independently adjusted from 0.5V to VCCA. Two frequency setting resistors set the on-time for each buck controller. The frequency can thus be tailored to minimize crosstalk. The integrated gate drivers feature adaptive shoot-through protection and soft switching. Additional features include cycle-by-cycle current limit, digital soft-start, over-voltage and undervoltage protection, and a PGOOD output for each controller. SC1485

FEATURES

Constant on-time for fast dynamic response Programmable VOUT range = 0.5 – VCCA VIN Range = 1.8V – 25V DC current sense using low-side RDS(ON) sensing or sense resistor Resistor programmable frequency Cycle-by-cycle current limit Digital soft-start Se...