SC1486 Datasheet PDF | Semtech Corporation

Semtech Corporation SC1486

The SC1486 is a dual output constant on synchronousbuck PWM controller optimized for cost effective mobile DDR applications. The excellent transient response means that SC1486 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.	SC1486
Datasheet	SC1486 Download
Manufacturer	Semtech Corporation
Description	Dual Synchronous Buck Pseudo Fixed Frequency DDR Power Supply Controller
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DESCRIPTION

FEATURES

include high efficiency, a fast dynamic response with no minimum on time, a REFIN input and a buffered REFOUT pin capable of sourcing 3mA. The output voltage of the first controller can be adjusted from 0.5V to VCCA. In DDR applications, this voltage is set to 2.5 volts. A resistor divider from the 2.5 volt supply is used to drive the REFIN pin of the second controller. A unity gain buffer drives the REFOUT pin to the same potential as REFIN. The second controller regulates its output to REFOUT. 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-bycycle current limit, digital soft-start, overvoltage and under-voltage protection, and a PGOOD output for each controller. SC1486

FEATURES

Constant on-time for fast dynamic response VIN range = 1.8V – 25V DC curren...