
1
2
3
4
10
9
8
7
PGOOD
VOS
FB
COMP_EN
BOOT
SW
HDRV
LDRV_OC
TPS51113\TPS51163
5
6
VDD
GND
11
R6
C4
R4
R1
R3
C3
D1
VDD
C5
V
OUT
C2
R2
C1
Enable
R5
R
BIAS
R
OC
L1
V
IN
Q1
Q2
C6
C7
–
+
UDG-08105
V
OUT
www.ti.com ....................................................................................................................................................................................................... SLUS864 – MAY 2009
SYNCHRONOUS BUCK CONTROLLER WITH HIGH-CURRENT GATE DRIVER
1
FEATURES
DESCRIPTION
Flexible Power Rails: 5 V to 12 V
The TPS51113 and TPS51163 are cost-optimized,
feature
rich,
single-channel
synchronous-buck
Reference: 800 mV ± 0.8%
controllers that operates from a single 4.5-V to 13.2-V
Voltage Mode Control
supply and can convert an input voltage as low as
Support Pre-biased Startup
1.5 V.
Programmable Overcurrent Protection with
The controller implements voltage mode control with
Low-Side RDS(on) Current Sensing
a
fixed
300-kHz
(TPS51113)
and
600-kHz
Fixed 300-kHz (TPS51113) and 600-kHz
(TPS51163) switching frequency. The overcurrent
(TPS51163) Switching Frequency
(OC) protection employs the low-side RDS(on) current
sensing and has user-programmable threshold. The
UV/OV Protections and Power Good Indicator
OC threshold is set by the resistor from LDRV_OC
Internal Soft-start
pin to GND. The resistor value is read when the
Integrated High-Current Drivers Powered by
over-current programming circuit applies 10
μA of
VDD
current to the LDRV_OC pin during the calibration
phase of the start-up sequence.
10-Pin 3 × 3 SON Package
The
TPS51113/TPS51163
also
supports
output
APPLICATIONS
pre-biased startup.
Server and Desktop Computer Subsystem
The integrated gate driver is directly powered by
Power Supplies (MCH, IOCH, PCI, Termination)
VDD. VDD can be connected to VIN in some
Distributed Power Supplies
applications.
The
strong
gate
drivers
with
low
deadtime allow for the utilization of larger MOSFETs
General DC-DC Converters
to achieve higher efficiency. An adaptive anti-cross
conduction scheme is used to prevent shoot-through
between the power FETs.
TYPICAL APPLICATION CIRCUIT
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright 2009, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.