®
SP6134
Dual Supply Synchronous Buck Controller
FEATURES
■ 3V to 15V Step Down Achieved Using Dual Input ■ Small 10-...
®
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 VCC and VIN ■ 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
VCC 1 GL 2 GND 3 VFB 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 VCC 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
VCC = 5V @ 30mA
RLF 3.0,5%
R3 221k, 1%
UVIN
R4 100k, 1%
DBST MBR0530
CVCC 10µF
6.3V
GND 3
0.8V
CVCC 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...