POWER MANAGEMENT

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SC2616

Complete DDR Power Solution

Features

Applications

Revision 3, March 2003

Typical Application Circuit

Description

The SC2616 is a fully integrated DDR power solution pro-

viding power for the VDDQ and the VTT rails. The SC2616

also completely adheres to the ACPI sleep state power

requirements. A synchronous buck controller provides

the high current of the VDDQ at high efficiency, while a

linear sink/source regulator provides the termination

voltage with 2 Amp Source/Sink capability. This approach

makes the best trade-off between cost and perfor-

mance. Additional logic and UVLOs complete the func-

tionality of this single chip DDR power solution in compli-

ance with S3 and S5 motherboard signals.

The SC2616 is capable of sourcing up to 20A at the

switcher output, and 2A source/sink at the VTT output.

The MLP package provides excellent thermal impedance

while keeping small footprint. VDDQ current limit as well

as 3 independent thermal shutdown circuits assure safe

operation under all fault conditions.

Power solution for DDR memory per ACPI

motherboard specification

High speed data line termination

Memory cards

High efficiency (90%) switcher for VDDQ supplies

20 Amps

High current gate drives

Single chip solution complies fully with ACPI power

sequencing specifications

Internal S3 state LDO

supplies high standby

VDDQ current (0.65Amp Min.)

ACPI sleep state controlled

2 Amp VTT source/sink capability

UVLO on 5V and 12V

Independent thermal shutdown for VDDQ and VTT

Fast transient response

18 pin MLP package

0.1uF

10k

VTT

1uF

10k

12V

0.1uF

S5

L

Suspend to RAM

U4 SC2616

1

8

6

7

4

3

2

5

9

18

17

16

15

14

13

12

11

10

FB

VDDQIN

VTT

VDDQSTBY

5VSBY

LGND

VTTSNS

VTT

5VCC

SS/EN

COMP

12VCC

TG

BG

PGND

AGND

SLP_S3

SLP_S5

Suspend to disk

5V STBY

S3

0.1uF

10uF

Cout

Cin

0.1uF

VDDQ

0.1uF

5V