SP6137 Datasheet, PDF (1/13 Pages) Sipex Corporation – Wide Input, 900KHz Synchronous PWM Controller

®
SP6137
Wide Input, 900KHz Synchronous PWM Controller
FEATURES
■ 2.5V to 20V 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
■ A Synchronous Start-Up into a Pre-Charged Output
V_CC 1
GL 2
GND 3
V_FB 4
COMP 5
SP6137
10 Pin MSOP
10 BST
9 _GH
8 _SWN
7 _SS
6 _UVIN
Now Available in Lead Free Packaging
APPLICATIONS
■ 12V DPA
■ Communications Systems
■ Graphics Cards
DESCRIPTION
The SP6137 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 SP6137 is designed to drive a pair of external NFETs using a fixed
900kHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown and output
short circuit protection. The SP6137 is available in the cost and space saving 10-pin MSOP.
TYPICAL APPLICATION CIRCUIT
V_CC = 5V @ 30mA
RLF
3.0,5%
R3
221k, 1%
UV_IN
R4
100k, 1%
DBST
MBR0530
C_VCC
10µF
6.3V
GND 3
0.8V
C_VCC
Ceramic
8050
X5R
CF1
100pF
U1
1 _VCC
BST ¹⁰
2
SP6137
GL
GH
9
3 _GND
SWN ⁸
4 _VFB
SS ⁷
5 _{COMP UVIN} 6
CZ2 RZ2
820pF 40.2k, 1%
CP1
56pF
8765
QT
FDS6676S
4
14.5A, 6mΩ
123
CBST
1µF
C1
22µF
16V
C2
22µF
16V
C1, C2
Ceramic
1210
X5R
VIN
2.5V -20V
GND
R5
Bead
8765
QB
L1 SC5018-2R7M
2.7µH @ 12A
DCR=4.30mΩ
4
SS
123
FDS6676S
CSS ^{14.5A, 6.0mΩ}
47nF
C3
47µF
6.3V
C4
47µF
6.3V
RZ3
4.64k, 1%
CZ3
220pF
V_OUT≤VIN
1.8V @ 10A
R1
68.1k, 1%
GND2
C3, C4
Ceramic
1210
X5R
R2
21.5k, 1%
Date: 7/28/04
SP6137 Wide Input, 900KHz Synchronous PWM Controll
1
© Copyright 2004 Sipex Corporation