TPS40195 Datasheet, PDF (1/39 Pages) Texas Instruments – 4.5-V TO 20-V SYNCHRONOUS BUCK CONTROLLER WITH SYNCHRONIZATION AND POWER GOOD

TPS40195
www.ti.com
SLUS720 – FEBRUARY 2007
4.5-V TO 20-V SYNCHRONOUS BUCK CONTROLLER WITH SYNCHRONIZATION AND
POWER GOOD
FEATURES
• Input Operating Voltage Range: 4.5 V to 20 V
• Output Voltage as Low as 0.591 V ±0.5%
• 180° Bi-Directional Out-of-Phase
Synchronization
• Internal 5-V Regulator
• High and Low MOSFET Sense Overcurrent
• 100 kHz to 600 kHz Switching Frequency
• Enable and Power Good
• Programmable UVLO and Hysteresis
• Thermal Shutdown at 150°C
• Selectable Soft-Start
• Pre-Bias Output Safe
APPLICATIONS
• Digital TV
• Entry-Level and Midrange Servers
• Networking Equipment
• Non-Isolated DC-DC modules
CONTENTS
Device Ratings
2
Electrical Characteristics
3
Typical Characteristics
5
Terminal Information
9
Application Information
11
Design Example
20
Additional References
33
DESCRIPTION
The TPS40195 is a flexible synchronous buck
controller that operates from a nominal 4.5 V to 20 V
supply. This controller implements voltage mode
control with the switching frequency adjustable from
100 kHz to 600 kHz. Flexible features found on this
device include selectable soft-start time,
programmable short circuit limit, programmable
undervoltage lockout (UVLO) and synchronization
capability. An adaptive anti-cross conduction scheme
is used to prevent shoot through current in the power
FETs. Short-circuit detection is done by sensing the
voltage drop across the low-side MOSFET when it is
on, and comparing it with a user programmable
threshold.
SIMPLIFIED APPLICATION DIAGRAM
TPS40195
1 EN
HDRV 16
2 FB
SW 15
3 COMP BOOT 14
4 VDD
LDRV 13
5 ULVO
BP 12
6 RT
SS_SEL 11
7 ILIM PGOOD 10
8 GND
SYNC 9
V_OUT
Power Good
UDG-06066
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 © 2007, Texas Instruments Incorporated