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SC2616_03 Datasheet

  • SC2616_03

  • Complete DDR Power Solution

  • 16頁

  • SEMTECH   SEMTECH

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Complete DDR Power Solution
POWER MANAGEMENT
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 performance.
Additional logic and UVLOs complete the functionality of
this single chip DDR power solution in compliance with
SLP_S3 and SLP_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.
SC2616
Features
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 (0.65 Amp Min.)
ACPI sleep state controlled
2 Amp VTT source/sink capability
UVLO on 5V and 12V
Indepent thermal shutdown for VDDQSTBY and VTT
Fast transient response
18 pin MLP package
Applications
Power solution for DDR memory per ACPI
motherboard specification
High speed data line termination
Memory cards
Typical Application Circuit
5VCC
12VCC
5VSBY
R3
R9
R1
Q1
Cin
C8
U1
16
4
SC2616
5VCC
TG
BG
PGND
SLP_S3#
SLP_S5#
11
10
SLP_S3
SLP_S5
VDDQSTBY
VDDQIN
FB
18
17
SS/EN
AGN D
COMP
PAD
VTTSNS
LGN D
VTT
VTT
9
15
14
13
7
8
1
2
5
6
C18
R4
Q2
VDDQ
L1
Cout
0
0
R7
Q3
0
12VCC
5VSBY
0
0
VTT
C15
C14
R5
1k
R8
1k
C5
0.1uF
12
19
R2
C6
3
0
0
0
0
0
October,13, 2003
1
www.semtech.com

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