SP6139 Datasheet, PDF (1/13 Pages) Sipex Corporation – Wide Input, 1.3MHz Synchronous PWM Controller

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Advanced
SP6139
Wide Input, 1.3MHz Synchronous PWM Controller
FEATURES
■ 2.5V to 20V Step Down Achieved Using Dual Input
■ Small 10-Pin MSOP Package
■ Up 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
SP6139
10 Pin MSOP
10 BST
9 GH
8 SWN
7 SS
6 UVIN
Now Available in Lead Free Packaging
APPLICATIONS
■ DSL Modems
■ Set-Top Boxes
■ 12V V_IN Point of Load Apps.
DESCRIPTION
The SP6139 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 SP6139 is designed to drive a pair of external NFETs using a fixed
1.3MHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown and output
short circuit protection. The SP6139 is available in the cost and space saving 10-pin MSOP.
TYPICAL APPLICATION CIRCUIT
V_CC = 5V @ 30mA
RLF
3.0,5%
R3
150k, 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
SP6139
GL
GH
9
3 _GND
SWN ⁸
4 _VFB
SS ⁷
5 _{COMP UVIN} 6
CZ2 RZ2
1.2nF 12.7k, 1%
CP1
39pF
87
QT
Si4922DY
8.3A, 18mΩ
2
1
R5
Bead
CBST
0.1µF
56
L1 SD25-2R2
2.2µH @ 2.8A
DCR=31mΩ
QB
Si4922DY
8.3A, 18mΩ
4
SS
3
CSS
47nF
C1
22µF
16V
C1, C2
Ceramic
1210
X5R
VIN
12V
GND
C3
47µF
6.3V
C4
47µF
6.3V
RZ3
2.26k, 1%
CZ3
220pF
V_OUT≤VIN
3.3V @ 2A
R1
68.1k, 1%
GND2
C3, C4
Ceramic
1210
X5R
R2
21.5k, 1%
Date: 12/20/04
SP6139 Wide Input, 1.3MHz Synchronous PWM Controller
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© Copyright 2004 Sipex Corporation