CS5157
CPU 5-Bit Synchronous Buck Controller
Features
Description
The CS5157 is a 5-bit synchronous
The CS5157 is specifically designed
to power Pentium® II processors
and other high performance core
logic. It includes the following fea-
tures: on board, 5-bit DAC, short
circuit protection, 1.0% output tol-
ꢀ Dual N-Channel Design
ꢀ Excess of 1MHz Operation
ꢀ 100ns Transient Response
ꢀ 5-Bit DAC
dual N-Channel buck controller. It
is designed to provide unprece-
dented transient response for
today’s demanding high-density,
high-speed logic. The regulator
ꢀ Backward Compatible with
operates using a proprietary control erance, VCC monitor, and pro-
Adjustable CS5120/5121
method, which allows a 100ns
response time to load transients.
The CS5157 is designed to operate
over a 4.25-16V range (VCC) using
12V to power the IC and 5V as the
main supply for conversion.
grammable soft start capability. The
CS5157 is available in 16 pin surface
mount.
ꢀ 30ns Gate Rise/Fall Times
ꢀ 1% DAC Accuracy
ꢀ 5V & 12V Operation
ꢀ Remote Sense
ꢀ Programmable Soft Start
ꢀ Lossless Short Circuit
Protection
Application Diagram
Switching Power Supply for core logic - Pentium® II processor
ꢀ VCC Monitor
ꢀ 25ns FET Nonoverlap Time
TM
ꢀ V2 Control Topology
ꢀ Current Sharing
12V
5V
ꢀ Overvoltage Protection
1200µF/10V x 3
0.1µF
AlEl
VCC2
IRL3103
VCC1
VID0
VGATE(H)
2µH
1.3V to 3.5V @ 13A
VID0
VID1
VID2
Package Options
VID1
VID2
CS5157
VGATE(L)
16 Lead SO Narrow
VID3
VID4
VID3
VID4
IRL3103
1200µF/10V x 5
AlEl
1
V
ID0
V
ID1
V
ID2
V
FB
COFF
PGnd
330pF
COMP
LGnd
SS
VFB
V
V
V
ID3
CC1
0.1µF
COMP
3.3k
SS
VFFB
GATE(L)
LGnd
0.33µF
V
PGnd
V
ID4
100pF
C
OFF
GATE(H)
V
FFB
V
CC2
V2 is a trademark of Switch Power, Inc.
Pentium is a registered trademark of Intel Corporation.
ON Semiconductor
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885–3600 Fax: (401)885–5786
N. American Technical Support: 800-282-9855
Web Site: www.cherry–semi.com
June, 1999 - Rev. 5
1