CS5155 Datasheet, PDF (1/14 Pages) Cherry Semiconductor Corporation – CPU 5-Bit Synchronous Buck Controller

CS5155
CPU 5-Bit Synchronous Buck Controller
Description
Features
The CS5155 is a 5-bit synchronous
dual N-Channel buck controller. It
is designed to provide unprece-
dented transient response for
todayÕs demanding high-density,
high-speed logic. The regulator
operates using a proprietary control
method, which allows a 100ns
response time to load transients.
The CS5155 is designed to operate
over a 4.25-14V range (V_CC) using
12V to power the IC and 5V as the
main supply for conversion.
The CS5155 is specifically designed
to power Pentium^¨ II processors
and other high performance core
logic. It includes the following fea-
tures: on board, 5-bit DAC, short
circuit protection, 1.0% output tol-
erance, V_CC monitor, and pro-
grammable soft start capability. The
CS5155 is backwards compatible
with the 4 bit CS-5150, allowing the
mother board designer the capabili-
ty of using either the CS-5150 or the
CS5155 with no change in layout.
The CS5155 is available in 16 pin
surface mount and DIP packages.
Application Diagram
Switching Power Supply for core logic - Pentium^¨ II processor
12V
5V
0.1mF
V_ID0
V_ID1
V_ID2
V_ID3
V_ID4
330pF
V_CC1
V_CC2
V_GATE(H)
V_ID0
V_ID1
V_ID2
V_ID3
V_ID4
CS5155
V_GATE(L)
C_OFF
PGnd
0.1mF
SS
COMP
0.33mF
LGnd
V_FB
V_FFB
3.3k
100pF
1200mF/16V x 3
AlEl
IRL3103
2mH
1.3V to 3.5V @ 13A
IRL3103
1200mF/16V x 5
AlEl
s Dual N-Channel Design
s Excess of 1MHz Operation
s 100ns Transient Response
s 5-Bit DAC
s Backward Compatible with
4 Bit CS-5150/5151 and
Adjustable CS-5120/5121
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
s V_CC Monitor
s 25ns FET Nonoverlap Time
s Adaptive Voltage
Positioning
s V^2ª Control Topology
s Current Sharing
s Overvoltage Protection
Package Options
16 Lead SO Narrow & PDIP
V_ID0 1
V_ID1
V_ID2
V_ID3
SS
V_ID4
C_OFF
V_FFB
V_FB
COMP
LGnd
V_CC1
V_GATE(L)
PGnd
V_GATE(H)
V_CC2
V² is a trademark of Switch Power, Inc.
Pentium is a registered trademark of Intel Corporation.
Rev. 1/22/99
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: [phone] Fax: [phone]
Email: [e-mail]
Web Site: www.cherry-semi.com
1
A
¨ Company