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CS5127 データシート(PDF) 1 Page - Cherry Semiconductor Corporation

部品番号 CS5127
部品情報  Dual Output Nonsynchronous Buck Controller with Sync Function and Second Channel Enable
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メーカー  CHERRY [Cherry Semiconductor Corporation]
ホームページ  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS5127 データシート(HTML) 1 Page - Cherry Semiconductor Corporation

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Features
3.3V
CT
SYNC
COMP2
PGnd
COMP1
ENABLE
LGnd
VFB1
VFB2
VREF
VIN
GATE1
GATE2
R6
1k
CS5127
C12, C13
2 x 680
mF
R9
2k
Q3
IRL3103S
R11
R2
27k
VFFB1
VFFB2
RT
Q2
IRL3103S
C16
100
mF
C8
1
mF
R3
18k
D2
1N5821
C15
100
mF
L2
5
mH
C1, C2
2 x 680
mF
L1
5
mH
C7
330pF
2.8V
C10, C11
2 x 680
mF
+5V
C3
1
mF
D1
1N5821
C14
330pF
R4
1540
R5
1270
R10
20k
+
C6
0.1
mF
R1
20k
Q1
FMMT2222ACT
5V
12V
+
C4, C5
2 x 680
mF
+
C17
330pF
20k
+
+
+
R7
2400
R8
1500
C9
0.1
mF
s
Nonsynchronous Buck
Design
s
V2ª Control Topology
s
100ns Transient Loop
Response
s
Programmable Oscillator
Frequency
s
30ns Typical Gate Rise
and 10ns Fall Times
(No Load)
s
Frequency
Synchronization Input
s
ENABLE Input Controls
Channel 2 Gate Driver
s
5V/10mA Reference
Output
Package Option
Dual Output Nonsynchronous Buck Controller
with Sync Function and Second Channel Enable
CS5127
Description
The CS5127 is a fixed frequency
dual output nonsynchronous buck
controller. It contains circuitry for
regulating two separate outputs.
Each output channel contains a
high gain error amplifier, a com-
parator and latch, and a totem-pole
output driver capable of providing
DC current of 100mA and peak cur-
rent in excess of 0.5A. A common
oscillator controls switching for
both channels, and a sync lead is
provided to allow parallel supply
operation or shifting of the switch-
ing noise spectrum. An on-chip 5V
reference is capable of providing as
much as 10mA of current for exter-
nal circuitry. The CS5127 also
contains two undervoltage lockout
circuits. The first lockout releases
when VIN reaches 8.4V, while the
second lockout ensures that VREF is
higher than 3.6V. The outputs are
held in a low state until both lock-
outs have released. The controller is
configured to utilize the V2ª con-
trol method to achieve the fastest
possible transient response and
best overall regulation. This dual
controller is a cost-effective solu-
tion for providing VCORE and VIO
power solutions in computing
applications using a single con-
troller. The CS5127 will operate
over an input voltage range of 9.4V
to 20V and is available in a 16 lead
wide body surface mount package.
Applications Diagram
16 Lead SOIC Wide
1
1
CT
SYNC
COMP2
PGND
COMP1
ENABLE
LGND
VFB1
VFB2
VREF
VIN
GATE1
GATE2
VFFB1
VFFB2
RT
12V, 5V to 2.8V @ 7A and 3.3V @ 7A for 233MHz Pentium¨ Processor with MMXª Technology
V2 is a trademark of Switch Power, Inc.
Pentium is a registered trademark and MMX is a trademark of Intel Corporation
Rev. 11/3/98
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
¨


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