CS5151
CPU 4-Bit Nonsynchronous Buck Controller
Features
Description
The CS5151 is a 4-bit nonsyn-
MMX™ Technology and other high
performance core logic. It includes
the following features: on board,
4-bit DAC, short circuit protection,
1.0% output tolerance, VCC monitor,
and programmable soft start capa-
ꢀ N-Channel Design
ꢀ Excess of 1MHz Operation
ꢀ 100ns Transient Response
ꢀ 4-Bit DAC
chronous N-Channel buck con-
troller. It is designed to provide
unprecedented transient response
for today’s demanding high-densi-
ty, high-speed logic. The regulator
ꢀ Upward Compatible with
operates using a proprietary control bility. The CS5151 is upwards com-
5-Bit CS5155/5156 and
method, which allows a 100ns
response time to load transients.
The CS5151 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.
patible with the 5-bit CS5156, allow-
ing the mother board designer the
capability of using either the
CS5151 or the CS5156 with no
change in layout. The CS5151 is
available in 16 pin surface mount
and DIP packages.
Adjustable CS5120/5121
ꢀ 30ns Gate Rise/Fall Times
ꢀ 1% DAC Accuracy
ꢀ 5V & 12V Operation
ꢀ Remote Sense
The CS5151 is specifically designed
to power Pentium® processors with
ꢀ Programmable Soft Start
ꢀ Lossless Short Circuit
Protection
ꢀ VCC Monitor
Application Diagram
Switching Power Supply for core logic - Pentium® processor with MMX™ Technology
ꢀ Adaptive Voltage
Positioning
12V
5V
2
™
ꢀ V
Control Topology
ꢀ Current Sharing
ꢀ Overvoltage Protection
1200µF/16V x 3
AlEl
0.1µF
V
IRL3103
V
CC2
CC1
V
GATE
2µH
2.1V to 3.5V @ 13A
V
V
V
V
ID0
V
ID1
V
ID2
V
ID3
ID0
ID1
ID2
Package Options
16 Lead SO Narrow & PDIP
CS5151
3
V
MBR735
ID3
1,2
1200µF/16V x 5
AlEl
C
OFF
1
V
ID0
V
ID1
V
ID2
V
FB
PGnd
330pF
COMP
LGnd
SS
V
FB
V
SS
V
NC
ID3
CC1
0.1µF
COMP
3.3k
V
FFB
LGnd
0.33µF
PGnd
NC
OFF
100pF
C
V
GATE
V
FFB
V
CC2
V2 is a trademark of Switch Power, Inc.
Pentium is a registered trademark and MMX is a trademark of Intel Corporation.
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
Rev. 1/5/99
1
A
®
Company