
1
Date: 8/4/04
SP6132 Wide Input, 300KHz Synchronous PWM Controller Copyright 2004 Sipex Corporation
SP6132
FEATURES
■
3V to 12V Step Down Achieved Using Dual Input
■
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 1.5
sink (2
source) NFET Drivers
■
Wide BW Amp Allows Type II or III Compensation
■
Programmable Soft Start
■
Fast Transient Response
■
High Efficiency: Greater than 95% Possible
■
A Synchronous Start-Up into a Pre-Charged Output
■
Small 10-Pin MSOP Package
Wide Input, 300KHz Synchronous PWM Controller
DESCRIPTION
The SP6132 is wide input, synchronous step-down switching 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 SP6132 is designed to drive a pair of external NFETs using a fixed
300kHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown and output
short circuit protection. The SP6132 is available in the cost and space saving 10-pin MSOP
.
TYPICAL APPLICATION CIRCUIT
V
CC
GL
GND
V
FB
COMP
SP6132
10 Pin MSOP
1
2
3
4
5
10
9
8
7
6
BST
GH
SWN
SS
UVIN
8 7 6 5
1 2 3
4
CSS
DCR=4.30m
QB
FDS7088N3
C3
47
μ
F
6.3V
R1
V
OUT
3.3V
R2
C
VCC
10
μ
F
6.3V
R3
221k, 1%
R4
100k, 1%
1CF1
CZ2
1500pF
CP1
22pF
fs=300Khz
RZ2
27.4k, 1%
FDS7088N3
8 7 6 5
4
1 2 3
MBDBST
SP6132
1
2
3
4
5
10
9
8
7
6
VCC
GL
GND
VFB
COMP
BST
GH
SWN
SS
UVIN
UV
IN
V
CC
GND 3
U1
C
VCC
Ceramic
0805
X5R
QT
SS
GND2
C3, C4
C4
47
μ
F
6.3V
RZ3
CZ3
C1
22
μ
F
16V
C2
22
μ
F
16V
GND
VIN
12V
C1, C2
R5
5.11, 1%
ALL RESISTORS AND CAPS ARE 0603 UNLESS OTHERWISE SPECIFIED
Q1, Q2 BOTTOM SIDE DRAIN CONTACT
CF
1
μ
10V
C7
μ
F
Now Available in Lead Free Packaging