SC1486A Datasheet PDF | Semtech Corporation

Semtech Corporation SC1486A

The SC1486A is a dual output constant on-time synchronous buck PWM controller optimized for cost effective mobile DDR and DDR2 applications. The excellent transient response means that SC1486A based solutions will require less output capacitance than competing fixed frequency converters. The output voltage of the first controller can be adjusted from 0.5V to VCCA.

Part No.	SC1486A
Datasheet	SC1486A Download
Manufacturer	Semtech Corporation
Description	Dual Synchronous Buck DDR and DDR2 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. In DDR applications, this voltage is set to 2.5 volts, and in DDR2, 1.8V. A resistor divider from this 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, requiring no gate resistors for the top MOSFET. Additional features include cycleby-cycle current limit, digital soft-start, over-voltage and under-voltage protection, and a Power Good output for each controller. SC1486A

FEATURES

1% DC accuracy Compatible with DDR & DDR2 memory power ...