®
SP6134
Dual Supply Synchronous Buck Controller
FEATURES
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3V to 15V Step Down Achieved Using Dual Input
Small 10-Pin MSOP Package
2A to 15A Ouput Capability
Highly Integrated Design, Minimal Components
UVLO Detects Both V
CC
and V
IN
Short Circuit Protection with Auto-Restart
On-Board 1.5Ω sink (2Ω source) NFET Drivers
Programmable Soft Start
Fast Transient Response
High Efficiency: Greater than 94% Possible
Asynchronous Start-Up into a Pre-Charged Output
U.S. Patent #6,922,041
V
CC
1
GL
2
GND
3
V
FB
4
COMP
5
10
BST
SP6134
10 Pin MSOP
9
GH
8
SWN
7
SS
6
UVIN
Now Available in Lead Free Packaging
APPLICATIONS
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12V DPA
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Communications Systems
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Graphics Cards
DESCRIPTION
The SP6134 is a synchronous step-down switching regulator controller optimized for high efficiency. The part is
designed to be especially attractive for dual supply, 12V step down with 5V used to power the controller. This lower V
CC
voltage minimizes power dissipation in the part. The SP6134 is designed to drive a pair of external NFETs using a fixed
600kHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown and output
short circuit protection. The SP6134 is available in the cost and space saving 10-pin MSOP
.
TYPICAL APPLICATION CIRCUIT
VIN
3.5V - 15V
C1
22µF
16V
FDS6676S
14.5A, 6mΩ
1 2 3
8 7 6 5
C2
22µF
16V
GND
V
CC
= 5V @ 30mA
QT
4
RLF
3.0,5%
CBST
1µF
DBST
MBR0530
1
VCC
GL
C1, C2
Ceramic
1210
X5R
U1
BST 10
GH 9
R5
Bead
8 7 6 5
R3
221k, 1%
UV
IN
R4
100k, 1%
C
VCC
10µF
6.3V
GND 3
2
3
4
SP6134
RZ3
4.64k, 1%
C3
47µF
6.3V
V
OUT
≤
VIN
0.8V - 3.3V
0 - 10 A
R1
68.1k, 1%
GND
VFB
COMP
SWN 8
SS 7
UVIN 6
QB
4
C4
47µF
6.3V
0.8V
5
SS
CSS
47nF
1 2 3
CZ3
220pF
C
VCC
Ceramic
8050
X5R
CF1
100pF
FDS6676S
14.5A, 6.0mΩ
CZ2
RZ2
GND2
C3, C4
Ceramic
1210
X5R
V
=(R1/R2 +1)V
OUT
FB
820pF 40.2k, 1%
CP1
56pF
fs=600Khz
R2
21.5k, 1%
Date: 2/16/06
SP6134 Dual Supply, Synchronous Buck Controller
© Copyright 2006 Sipex Corporation
1
SIPEX [ SIPEX CORPORATION ]
