CS5151
CS5151
CPU 4-Bit Nonsynchronous Buck Controller
Description
The CS5151 is a 4-bit nonsyn-
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
operates using a proprietary control
method, which allows a 100ns
response time to load transients.
The CS5151 is designed to operate
over a 4.25-16V range (V
CC
) using
12V to power the IC and 5V as the
main supply for conversion.
The CS5151 is specifically designed
to power Pentium
®
processors with
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, V
CC
monitor,
and programmable soft start capa-
bility. The CS5151 is upwards com-
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.
Features
s
N-Channel Design
s
Excess of 1MHz Operation
s
100ns Transient Response
s
4-Bit DAC
s
Upward Compatible with
5-Bit CS5155/5156 and
Adjustable CS5120/5121
s
30ns Gate Rise/Fall Times
s
1% DAC Accuracy
s
5V & 12V Operation
s
Remote Sense
s
Programmable Soft Start
s
Lossless Short Circuit
Protection
Application Diagram
Switching Power Supply for core logic - Pentium
®
processor with MMX™ Technology
12V
5V
s
V
CC
Monitor
s
Adaptive Voltage
Positioning
s
V
2
™ Control Topology
s
Current Sharing
s
Overvoltage Protection
0.1µF
1200µF/16V x 3
AlEl
IRL3103
2µH
2.1V to 3.5V @ 13A
V
CC1
V
CC2
V
ID0
V
ID1
V
ID2
V
ID3
V
ID0
V
ID1
V
ID2
V
ID3
C
OFF
330pF
SS
0.1µF
0.33µF
COMP
LGnd
V
GATE
CS5151
MBR735
Package Options
3
1,2
16 Lead SO Narrow & PDIP
1200µF/16V x 5
AlEl
PGnd
V
FB
V
FFB
3.3k
V
ID0
V
ID1
V
ID2
V
ID3
SS
NC
C
OFF
V
FFB
1
V
FB
COMP
LGnd
V
CC1
NC
PGnd
V
GATE
V
CC2
100pF
V
2
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
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
