CS5165 Datasheet, PDF (1/19 Pages) Cherry Semiconductor Corporation – Fast, Precise 5-Bit Synchronous Buck Controller for the Next Generation Low Voltage Pentium II Processors

CS5165
Fast, Precise 5-Bit Synchronous Buck Controller
for the Next Generation Low Voltage Pentium^® II Processors
Description
Features
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
5V to 2.8V @ 14.2A for 300MHz Pentium^®II
12V
5V
1µF
1200µF/10V x 3
0.1µF
0.1 µF
330pF
SS
COMP
COFF
VID4
VID3
VID2
VID1
CS5165
VID0
VCC
GATE(H)
GATE(L)
PGnd
LGnd
VFB
PWRGD
ENABLE
IRL3103
PCB
1.2µH trace 6mΩ
VCC
IRL3103
3.3K
1000pF
1200µF
10V x 5
VSS
PWRGD
ENABLE
VID0
VID1
VID2
VID3
VID4
Pentium® II
System
V² is a trademark of Switch Power, Inc.
Pentium is a registered trademark of Intel Corporation.
Rev. 6/28/99
1
s V^2™ Control Topology
s Dual N Channel Design
s 100ns Controller Transient
Response
s Excess of 1Mhz Operation
s 5 Bit DAC with 1% Tolerance
s Power Good Output With
Internal Delay
s Enable Input Provides
Micropower Shutdown Mode
s Complete Pentium^® II System
Requires 18 Components
s 5V and 12V Operation
s Adaptive Voltage Positioning
s Remote Sense Capability
s Current Sharing Capability
s V_CC Monitor
s Hiccup Mode Short Circuit
Protection
s Overvoltage Protection (OVP)
s Programmable Soft Start
s 150ns PWM Blanking
s 65ns FET Non-Overlap
s 40ns Gate Rise and Fall Times
(3.3nF load)
Package Options
16 Lead SO WIDE
V_ID0 ¹
V_ID1
V_ID2
V_ID3
SS
V_ID4
C_OFF
ENABLE
V_FB
COMP
LGnd
PWRGD
GATE(L)
PGnd
GATE(H)
V_CC
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: [phone] Fax: [phone]
Email: [e-mail]
Web Site: www.cherry-semi.com
A
® Company