sc1486aitstr Semtech Corporation, sc1486aitstr Datasheet

sc1486aitstr

Manufacturer Part Number

sc1486aitstr

Description

Complete Ddr1/2/3 Power Supply Controller

Manufacturer

Semtech Corporation

Datasheet

1.SC1486AITSTR.pdf (30 pages)

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The SC1486A is a dual output constant on-time

synchronous buck PWM controller optimized for cost

effective mobile DDR1, DDR2 and DDR3 applications.

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 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. In DDR1 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 cycle-

by-cycle current limit, digital soft-start, over-voltage and

under-voltage protection, and a Power Good output for

each controller.

Revision: September 20, 2006

POWER MANAGEMENT

Description

Typical Application Circuit

PGOOD

RTON2

R10

PGOOD

VBAT

1nF

C11

5VSUS

VBAT

RTON1

100nF

1nF

R11

C12

VDDQ

10k

R15

10k

REFOUT

VDDQ

R12

10R

C13

1uF

10R

5VSUS

VSSA1

VSSA2

1uF

VTT

C14

1uF

EN/PSV1

TON1

VOUT1

VCCA1

FB1

PGD1

VSSA1

REFIN

TON2

REFOUT

VCCA2

FB2

PGD2

VSSA2

SC1486A

PGND1

PGND2

VDDP1

VDDP2

BST1

ILIM1

BST2

ILIM2

DH1

DH2

DL1

DL2

LX1

LX2

Features

Applications

5VSUS

5VRUN

1% DC accuracy

Compatible with DDR1, DDR2 and DDR3 memory

power requirements

Constant on-time for fast dynamic response

VBAT range = 1.8V – 25V

DC current sense using low-side RDS(ON) sensing

or sense resistor

Integrated reference buffer for VTT

Low power S3 state with high-Z VTT

Resistor programmable on-time

Cycle-by-cycle current limit

Digital soft-start

PSAVE option for VDDQ

Over-voltage/under-voltage fault protection

<20µA shutdown current

Low quiescent power dissipation

Two Power Good indicators

Separate enable for each switcher

Integrated gate drivers with soft switching - no gate

resistors required

Efficiency >90%

28 Lead TSSOP (Lead-free available, fully WEEE

and RoHS compliant)

Notebook computers

CPU I/O supplies

Handheld terminals and PDAs

1uF

C10

1uF

R13

C1 0.1uF

0.1uF

VBAT

Power Supply Controller

10uF

VSSA1

Complete DDR1/2/3

VSSA2

R14 0R

VDDQ

VTT

SC1486A

www.semtech.com

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