TPS40197 Datasheet, PDF (1/28 Pages) Texas Instruments – SYNCHRONOUS BUCK CONTROLLER WITH 4-BIT VID INTERFACE FOR SMART-REFLEX™ DSPs

TPS40197
www.ti.com
SLUS886A – NOVEMBER 2008 – REVISED JULY 2012
SYNCHRONOUS BUCK CONTROLLER WITH 4-BIT VID INTERFACE
FOR SMART-REFLEX™ DSPs
FEATURES
1
•2 Input Voltage Range: 4.5 V to 14 V
• 4-Bit Dynamic VID-On-The-Fly Support
• VID Programmable Output Voltage with
Programmable Transition Rate
• Fixed Switching Frequency of 520 kHz
• Selectable Low-Side (Three Settings) and
Fixed High-Side Thermally Compensated
Overcurrent Protection
• Power Good Indicator
• Internal 5-V Regulator
• Voltage Mode Control
• Internally Fixed 5.5-ms Soft-Start Time
• Pre-Bias Output Safe
• Thermal Shutdown at 140°C
• 16-Pin QFN Package
APPLICATIONS
• Smart-Reflex™ DSPs
• POL Modules
• Telecom
CONTENTS
Device Ratings
2
Electrical Characteristics
4
Typical Characteristics
6
Device Information
10
Application Information
12
Design Example
18
Additional References
20
DESCRIPTION
The TPS40197 is a synchronous buck controller that
operates from 4.5 V to 14 V input supply nominally.
The controller implements voltage-mode control
architecture with the switching frequency fixed at
520 kHz. The higher switching frequency facilitates
the use of smaller inductor and output capacitors,
thereby providing a compact power-supply solution.
An adaptive anti-cross conduction scheme is used to
prevent shoot through current in the power FETs.
The TPS40197 integrates the PWM control and 4-bit
VID interface in a single chip to allow seamless on-
the-fly VID changes with programmable transition
rate. It provides a simple power solution for Smart-
Reflex™ DSP cores.
TYPICAL APPLICATION CIRCUIT
SD
V
OUT
VID3
VID2
VID1
VID0
HOST
V
IN
1
VID1
2 VID0
16
VID2
VID3 15
3 REF
HDRV 14
4 EN
SW 13
TPS40197
5 FB
BOOT 12
6 COMP LDRV 11
7 VDD
PGOOD
8
BP 10
GND
9
V_IN
V_OUT
UDG-08100
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.
SMART-REFLEX, Smart-Reflex, PowerPAD are trademarks of Texas Instruments.
2
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 © 2008–2012, Texas Instruments Incorporated