COFF
VID4
VID3
VID2
V
CC
VFB
PWRGD
COMP
IRL3103
IRL3103
1?F
12V 5V
1.2?H
GATE(H)
GATE(L)
PGnd
1200?F/10V x 3
330pF
VID1
SS
ENABLE
LGnd
PCB
trace 6m?
0.1?F
0.1 ?F
VID0
1200?F
10V x 5
PWRGD
ENABLE
VID4
VID3
VID2
VID1
VID0
Pentium? II
System
1000pF
3.3K
CS5165
VSS
VCC
Features
a73 V
2
?
Control Topology
a73 Dual N Channel Design
a73 100ns Controller Transient
Response
a73 Excess of 1Mhz Operation
a73 5 Bit DAC with 1% Tolerance
a73 Power Good Output With
Internal Delay
a73 Enable Input Provides
Micropower Shutdown Mode
a73 Complete Pentium
?
II System
Requires 18 Components
a73 5V and 12V Operation
a73 Adaptive Voltage Positioning
a73 Remote Sense Capability
a73 Current Sharing Capability
a73 V
CC
Monitor
a73 Hiccup Mode Short Circuit
Protection
a73 Overvoltage Protection (OVP)
a73 Programmable Soft Start
a73 150ns PWM Blanking
a73 65ns FET Non-Overlap
a73 40ns Gate Rise and Fall Times
(3.3nF load)
Package Options
CS5165
Fast, Precise 5-Bit Synchronous Buck Controller
for the Next Generation Low Voltage Pentium
?
II Processors
CS5165
Description
The CS5165 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 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 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 CS5165 protects the processor during
potentially catastrophic events like over-
voltage (OVP) and short circuit. The OVP
feature is part of the V
2
?
architecture and
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.
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.
Application Diagram
1
16 Lead SO WIDE
1
V
ID0
V
ID1
V
ID2
V
ID3
ENABLE
C
OFF
SS
V
ID4
V
FB
COMP
LGnd
PWRGD
GATE(L)
PGnd
GATE(H)
V
CC
V
2
is a trademark of Switch Power, Inc.
Pentium is a registered trademark of Intel Corporation.
5V to 2.8V @ 14.2A for 300MHz Pentium
?
II
Rev. 6/28/99
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
A Company?
