CS5155H
CS5155H
CPU 5-Bit Synchronous Buck Controller
Description
The CS5155H is a 5-bit synchronous
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
operates using a proprietary control
method, which allows a 100ns
response time to load transients.
The CS5155H is designed to operate
over a 4.25-20V range (V
CC
) using
12V to power the IC and 5V or 12V
as the main supply for conversion.
The CS5155H is specifically
designed to power Pentium
®
II pro-
cessors and other high performance
core logic. It includes the following
features: on board, 5-bit DAC, short
circuit protection, 1.0% output tol-
erance, V
CC
monitor, and pro-
grammable soft start capability. The
CS5155H is backwards compatible
with the 4 bit CS5150, allowing the
mother board designer the capabili-
ty of using either the CS5150 or the
CS5155H with no change in layout.
The CS5155H is available in 16 pin
surface mount.
Features
s
Dual N-Channel Design
s
Excess of 1MHz Operation
s
100ns Transient Response
s
5-Bit DAC
s
Backward Compatible with
4 Bit CS5150H/5151H 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
®
II processor
12V
5V
s
V
CC
Monitor
s
25ns FET Nonoverlap Time
s
Adaptive Voltage
Positioning
s
V
2
™ Control Topology
s
Current Sharing
s
Overvoltage Protection
2µH
1.3V to 3.5V @ 13A
0.1µF
1200µF/16V x 3
AlEl
IRL3103
V
CC1
V
CC2
V
ID0
V
ID1
V
ID2
V
ID3
V
ID4
330pF
SS
0.1µF
0.33µF
COMP
LGnd
V
ID0
V
ID1
V
ID2
V
ID3
V
ID4
C
OFF
V
GATE(H)
Package Options
CS5155H
V
GATE(L)
IRL3103
1200µF/16V x 5
AlEl
PGnd
V
FB
V
FFB
3.3k
16 Lead SO Narrow
V
ID0
V
ID1
V
ID2
V
ID3
SS
V
ID4
C
OFF
V
FFB
1
V
FB
COMP
LGnd
V
CC1
V
GATE(L)
PGnd
V
GATE(H)
V
CC2
100pF
V
2
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. 1/21/99
1
A
®
Company
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
