SC2616_03 Datasheet, PDF (1/16 Pages) Semtech Corporation – Complete DDR Power Solution

SC2616
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.
Typical Application Circuit
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
5VCC
12VCC
5VSBY
SLP_S3#
SLP_S5#
R1
Q1
R3
R9
C8
U1 SC2616
Q2
R4
C18
0
16 _12VCC
4 _5VSBY
5VCC ⁹
15
TG
0
BG ¹⁴
Q3
R7
PGND ¹³
11 _{SLP_S3}
VDDQSTBY ⁷
10
SLP_S5
8
VDDQIN
FB ¹
18 _SS/EN
VTTSNS ²
17
COMP
C5
R2
5
VTT
VTT ⁶
0
R5
VTT
1k
C15
C14
R8
1k
C6
Cin
0
L1
Cout
VDDQ
0
0
00
0
0
October,13, 2003
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