SC2616 Datasheet, PDF (1/17 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 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.
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 (0.65Amp 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
Applications
‹ Power solution for DDR memory per ACPI
motherboard specification
‹ High speed data line termination
‹ Memory cards
5V
12V
10uF 0.1uF
5V STBY
0.1uF
Suspend to RAM
Suspend to disk
0.1uF
C in
10k 10k
S3
S5
U4 SC2616
16 _12VCC
5VCC ⁹
4 _5VSBY
TG ¹⁵
11 _{SLP_S3}
BG ¹⁴
10 _{SLP_S5}
PGND ¹³
18 _SS/EN
VDDQSTBY ⁷
17 _COMP
VDDQIN ⁸
12 _AGND
FB ¹
3 _LGND
VTT ⁶
2 _VTTSNS
VTT ⁵
1uF
L
C out
0.1uF
VDDQ
VTT
0.1uF
Revision 3, March 2003
1
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