TPS51113 Datasheet, PDF (1/26 Pages) Texas Instruments – SYNCHRONOUS BUCK CONTROLLER WITH HIGH-CURRENT GATE DRIVER

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