CS5165H
CS5165H
Fast, Precise 5-Bit Synchronous Buck Controller
for the Next Generation Low Voltage Pentium
®
II Processors
Description
The CS5165H synchronous 5-bit NFET
buck controller is optimized to manage
the power of the next generation
Pentium
®
II processors. It’s V
2
™ control
architecture delivers the fastest transient
response (100ns), and best overall voltage
regulation in the industry today. It’s fea-
ture rich design gives end users the maxi-
mum flexibility to implement the best
price/performance solutions for their end
products.
The CS5165H has been carefully crafted
to maximize performance and protect the
processor during operation. It has a 5-bit
DAC on board that holds a
±1%
tolerance
over temperature. Its on board pro-
grammable soft start insures a control
start up, and the FET nonoverlap circuit-
ry ensures that both FETs do not conduct
simultaneously.
The on board oscillator can be pro-
grammed up to 1MHz to give the design-
er maximum flexibility in choosing exter-
nal components and setting systems
costs.
The CS5165H protects the processor dur-
ing potentially catastrophic events like
overvoltage (OVP) and short circuit. The
OVP feature is part of the V
2
™ architec-
ture and does not require any additional
components. During short circuit, the
controller pulses the MOSFETs in a “hic-
cup” mode (3% duty cycle) until the fault
is removed. With this method, the
MOSFETs do not overheat or self
destruct.
The CS5165H is designed for use in both
single processor desktop and multipro-
cessor workstation and server applica-
tions. The IC can be powered from either
single or dual 5V, 12V power supplies.
The CS5165H’s current sharing capability
allows the designer to build multiple par-
allel and redundant power solutions for
multiprocessor systems.
The CS5165H contains other control and
protection features such as Power Good,
ENABLE, and adaptive voltage position-
ing. It is available in a 16 lead SOIC wide
body package.
Features
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
V
2
™ Control Topology
Dual N Channel Design
100ns Controller Transient
Response
Excess of 1Mhz Operation
5 Bit DAC with 1% Tolerance
Power Good Output With
Internal Delay
Enable Input Provides
Micropower Shutdown Mode
Complete Pentium
®
II System
Requires 18 Components
5V and 12V Operation Using
Either Dual or Single Supplies
Adaptive Voltage Positioning
Remote Sense Capability
Current Sharing Capability
V
CC
Monitor
Hiccup Mode Short Circuit
Protection
Overvoltage Protection (OVP)
Programmable Soft Start
150ns PWM Blanking
65ns FET Non-Overlap
40ns Gate Rise and Fall Times
(3.3nF load)
Application Diagram
5V to 2.8V @ 14.2A for 300MHz Pentium
®
II
12V
1µF
5V
1200µF/10V x 3
SS
V
CC
GATE(H)
GATE(L)
IRL3103
PCB
1.2µH
trace 6mΩ
1200µF
10V x 5
IRL3103
V
CC
V
SS
0.1µF
0.1
µF
330pF
COMP
Package Options
16 Lead SO WIDE
Pentium® II
System
C
OFF
V
ID4
CS5165H
PGnd
LGnd
V
ID3
V
ID2
V
ID1
V
ID0
PWRGD
ENABLE
V
ID0
3.3K
V
FB
PWRGD
ENABLE
V
ID1
V
ID0
V
ID1
V
ID2
V
ID3
SS
1
V
FB
COMP
LGnd
PWRGD
GATE(L)
PGnd
GATE(H)
V
CC
1000pF
V
ID2
V
ID3
V
ID4
V
ID4
C
OFF
ENABLE
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. 12/24/98
1
A
®
Company
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
