CS5165
Fast, Precise 5-Bit Synchronous Buck Controller
for the Next Generation Low Voltage Pentium® II Processors
Features
Description
The CS5165 synchronous 5-bit NFET
nal components and setting systems costs.
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Control Topology
buck controller is optimized to manage
the power of the next generation
The CS5165 protects the processor during
potentially catastrophic events like over-
Dual N Channel Design
®
2
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Pentium II processors. It’s V
control
voltage (OVP) and short circuit. The OVP
100ns Controller Transient
Response
2
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.
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architecture and
feature is part of the V
does not require any additional compo-
nents. During short circuit, the controller
pulses the MOSFETs in a “hiccup” mode
(3% duty cycle) until the fault is removed.
With this method, the MOSFETs do not
overheat or self destruct.
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Excess of 1Mhz Operation
5 Bit DAC with 1% Tolerance
Power Good Output With
Internal Delay
The CS5165 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 CS5165 is designed for use in both
single processor desktop and multipro-
cessor workstation and server applica-
tions. The CS5165’s current sharing capa-
bility allows the designer to build multi-
ple parallel and redundant power solu-
tions for multiprocessor systems.
The CS5165 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.
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Enable Input Provides
Micropower Shutdown Mode
Complete Pentium® II System
Requires 18 Components
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5V and 12V Operation
Adaptive Voltage Positioning
Remote Sense Capability
Current Sharing Capability
VCC Monitor
The on board oscillator can be pro-
grammed up to 1MHz to give the design-
er maximum flexibility in choosing exter-
Hiccup Mode Short Circuit
Protection
ꢀꢀ Overvoltage Protection (OVP)
Application Diagram
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Programmable Soft Start
150ns PWM Blanking
65ns FET Non-Overlap
5V to 2.8V @ 14.2A for 300MHz Pentium®II
5V
12V
1200µF/10V x 3
1µF
40ns Gate Rise and Fall Times
(3.3nF load)
IRL3103
1.2µH
V
PCB
trace 6mΩ
CC
SS
COMP
V
CC
GATE(H)
GATE(L)
0.1µF
0.1 µF
330pF
1200µF
10V x 5
C
Package Options
OFF
V
SS
V
ID4
ID3
ID2
CS5165
PWRGD
ENABLE
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IRL3103
3.3K
16 Lead SO WIDE
Pentium II
V
PGnd
LGnd
System
V
V
V
ID0
1
VFB
VID0
VID1
VID2
VID3
SS
V
V
FB
ID1
ID2
ID3
ID1
V
V
COMP
LGnd
PWRGD
1000pF
V
ID0
PWRGD
ENABLE
V
ID4
GATE(L)
PGnd
GATE(H)
VID4
COFF
ENABLE
VCC
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. 6/28/99
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Company