CS5156
CPU 5-Bit Nonsynchronous Buck Controller
Features
Description
The CS5156 is a 5-bit nonsyn-
and other high performance core
logic. It includes the following fea-
tures: on board, 5-bit DAC, short
circuit protection, 1.0% output tol-
erance, VCC monitor, and pro-
ꢀ N-Channel Design
ꢀ Excess of 1MHz Operation
ꢀ 100ns Transient Response
ꢀ 5-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
grammable soft start capability. The
ꢀ Backward Compatible with
operates using a proprietary control CS5156 is backwards compatible
4-Bit CS5150/5151 and
method, which allows a 100ns
response time to load transients.
The CS5156 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.
with the 4-bit CS5151, allowing the
mother board designer the capabili-
ty of using either the CS5151 or the
CS5156 with no change in layout.
The CS5156 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 CS5156 is specifically designed
to power Pentium® II processors
ꢀ Programmable Soft Start
ꢀ Lossless Short Circuit
Protection
ꢀ VCC Monitor
Application Diagram
Switching Power Supply for core logic - Pentium® II processor
ꢀ 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
1.3V to 3.5V @ 13A
V
V
V
V
V
V
ID0
ID0
ID1
ID2
ID1
ID2
Package Options
16 Lead SO Narrow & PDIP
CS5156
2
V
ID3
V
ID4
MBR1535CT
V
ID3
V
ID4
1,3
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
V
PGnd
ID4
100pF
C
OFF
V
GATE
V
FFB
V
CC2
V2 is a trademark of Switch Power, Inc.
Pentium is a registered 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