SC2615 Datasheet, PDF (1/13 Pages) Semtech Corporation – Complete DDR Power Solution

SC2615
Complete DDR Power Solution
POWER MANAGEMENT
Description
The SC2615 is a fully integrated, Three in One, Linear
DDR power solution providing power for the VDDQ and
the VTT rails. The SC2615 completely adheres to the
ACPI sleep state power requirements per Intel^R
motherboard specifications. A linear regulator controller
provides the high current of the VDDQ during S0, via an
external Power MOSFET, while an internal 1.8A (min) sink/
source regulator supplies the termination voltage.
In addition to these two blocks, an Internal LDO provides
VDDQ power during S3, capable of sourcing 650 mA.
The SC2615 uses Intel^R defined Latched BF_CUT signal
which is also used to drive the external Blocking MOSFET.
Additional logic, two UVLOs and three thermal shutdown
circuits assure reliability of this single chip DDR power
solution. A Power Good Output indicates the rails are in
regulation.
A Soft Start/Enable pin assures proper startup and allows
external shutdown control. The MLP package provides
excellent thermal impedance while keeping a small
footprint.
Typical Application Circuit
Features
‹ Single chip solution adheres to ACPI sleep state
requirements using BF_CUT
‹ UVLO on 3.3V and 12V
‹ Internal S3 state LDO for VDDQ supplies 650 mA
‹ Dual thermal shutdown
‹ Fast transient response
‹ Internal VTT regulator Sinks and Sources 1.8A
(Min)
‹ Power good output
‹ 18 pin MLP package
Applications
‹ DDR power solution for Intel^R motherboard
applications
‹ High speed data line termination
‹ Graphic cards
‹ Disk drives
12V
5V
5V STBY
1uF
BF_CUT
PWRGD
BF_CUT
PWRGD
0.1uF
Cin
SC2615
16 _12VCC
3.3VCC ⁹
4 _5VSBY
TG ¹⁵
11 _{BF_CUT}
NC ¹⁴
10 _PGOOD
NC ¹³
18 _{SS/EN VDDQSTBY} 7
17 _NC
VDDQIN ⁸
12 _AGND
FB ¹
3 _LGND
VTT ⁶
2 _VTTSNS
VTT ⁵
Cout
VDDQ
VTT
Revision 2, April 2003
1
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