SP6134_06 Datasheet, PDF (1/14 Pages) Sipex Corporation – Dual Supply Synchronous Buck Controller

®
SP6134
Dual Supply Synchronous Buck Controller
FEATURES
■ 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
SP6134
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 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
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
SP6134
GL
GH
9
3 _GND
SWN ⁸
4 _VFB
SS ⁷
5 _{COMP UVIN} 6
CZ2 RZ2
820pF 40.2k, 1%
CP1
56pF
fs=600Khz
8765
QT
FDS6676S
4
14.5A, 6mΩ
123
CBST
1µF
R5
Bead
8765
QB
4
SS
123
FDS6676S
CSS ^{14.5A, 6.0mΩ}
47nF
VOUT=(R1/R2 +1)VFB
C1
22µF
16V
C2
22µF
16V
C1, C2
Ceramic
1210
X5R
VIN
3.5V - 15V
GND
C3
47µF
6.3V
C4
47µF
6.3V
RZ3
4.64k, 1%
CZ3
220pF
V_OUT≤VIN
0.8V - 3.3V
0 - 10 A
R1
68.1k, 1%
GND2
C3, C4
Ceramic
1210
X5R
R2
21.5k, 1%
Date: 2/16/06
SP6134 Dual Supply, Synchronous Buck Controller
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© Copyright 2006 Sipex Corporation