SP6134H
High Voltage, 600kHz Synchronous PWM Step Down
Controller
January 2009
Rev. 2.0.0
GENERAL DESCRIPTION
The SP6134H is a 600kHz constant frequency,
voltage mode, synchronous PWM step down
controller optimized for high efficiency.
The SP6134H is adequately suited for split
plane applications utilizing a low power 5V rail
to power the controller circuitry, minimizing
power dissipation. Its wide input voltage range
of 3V to 15V allows for conversions from the
standard 3.3V, 5V, 9.6V and 12V power rails
to an output voltage adjustable down to 0.8V.
Developed around a wide bandwidth internal
amplifier, the SP6134H can accommodate type
II and type III compensation schemes.
Protection features include a programmable
UVLO, thermal shutdown and output short
circuit protection.
The SP6134H is part of a larger family of step
down
controllers
operating
at
various
switching frequencies up to 1300kHz and input
voltages up to 28V. Refer to Exar’s SP6134,
SP6132, SP6132H, SP6137 and SP6139 for
complete details.
The SP6134H is available in lead free, RoHS
compliant,
space
saving
10-pin
MSOP
package.
APPLICATIONS
•
Wireless Base Station
•
Automotive
•
Industrial
•
Power Supply
FEATURES
•
3V to 28V Step Down Achieved Using
Dual Input
•
On-Board 1.5Ω sink (2Ω source) NFET
Drivers
•
Up to 15A Output Capability
•
UVLO Detects Both VCC and VIN
•
Short-Circuit Protection with Auto-
Restart
•
Supports Type II or III Compensation
•
Programmable Soft Start
•
Fast Transient Response
•
High Efficiency: Greater than 94%
•
Non-synchronous Start-Up
•
Small 10-Pin MSOP Package
•
U.S. Patent #6,922,041
TYPICAL APPLICATION DIAGRAM
VIN
3.5V - 15V
C1
22μF
16V
FDS6676S
14.5A, 6mΩ
1 2 3
8 7 6 5
C2
22μF
16V
GND
V
CC
= 5V @ 30mA
QT
4
RLF
3.0,5%
CBST
1μF
DBST
MBR0530
1
C1, C2
Ceramic
1210
X5R
U1
SP6134H
VCC
GL
GND
VFB
COMP
BST 10
GH 9
SWN 8
SS 7
UVIN 6
2
3
4
0.8V
5
R5
Bead
8 7 6 5
R3
221k, 1%
UV
IN
R4
100k, 1%
C
VCC
10μF
6.3V
C
VCC
Ceramic
8050
X5R
RZ3
4.64k, 1%
C3
47μF
6.3V
C4
47μF
6.3V
CZ3
220pF
V
OUT
≤
VIN
0.8V - 3.3V
0 - 10 A
R1
68.1k, 1%
GND 3
QB
4
SS
CSS
47nF
1 2 3
FDS6676S
14.5A, 6.0mΩ
CZ2
RZ2
GND2
C3, C4
Ceramic
1210
X5R
V
OUT
=(R1/R2 +1)V
FB
820pF 40.2k, 1%
CP1
CF1
100pF
56pF
fs=600Khz
R2
21.5k, 1%
Fig. 1: SP6134H Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
EXAR [ EXAR CORPORATION ]
