SLVSBK0A – OCTOBER 2012 – REVISED FEBRUARY 2013
42 V Input, 3.5 A, Step Down DC-DC Converter with Eco-mode™
Check for Samples:
4.5 V to 42 V (45 V Abs Max) Input Range
3.5 A Continuous Current, 4.5 A Minimum Peak
Inductor Current Limit
Current Mode Control DC-DC Converter
92-mΩ High-Side MOSFET
High Efficiency at Light Loads with Pulse
Low Dropout at Light Loads with Integrated
BOOT Recharge FET
Operating Quiescent Current
100 kHz to 2.5 MHz Fixed Switching Frequency
Synchronizes to External Clock
Adjustable UVLO Voltage and Hysteresis
Accurate Cycle-by-Cycle Current Limit
Thermal, Overvoltage, and Frequency
0.8 V 1% Internal Voltage Reference
8-Pin HSOIC with PowerPAD™ Package
–40°C to 150°C T
Supported by WEBENCH™ Software Tool
12 V, 24 V and 48 V Industrial, Automotive and
Communications Power Systems
The TPS54340 is a 42 V, 3.5 A, step down regulator with an integrated high side MOSFET. The device survives
load dump pulses up to 45 V per ISO 7637. Current mode control provides simple external compensation and
flexible component selection. A low ripple pulse skip mode reduces the no load supply current to 146
Shutdown supply current is reduced to 1
when the enable pin is pulled low.
Undervoltage lockout is internally set at 4.3 V but can be increased using the enable pin. The output voltage start
up ramp is internally controlled to provide a controlled start up and eliminate overshoot.
A wide switching frequency range allows either efficiency or external component size to be optimized. Frequency
foldback and thermal shutdown protects internal and external components during an overload condition.
The TPS54340 is available in an 8-pin thermally enhanced HSOIC PowerPAD™ package.
EFFICIENCY vs LOAD CURRENT
Efficiency - %
= 600 kHz
- Output Current - A
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.
Eco-mode, PowerPAD, WEBENCH are trademarks of Texas Instruments.
Copyright © 2012–2013, Texas Instruments Incorporated
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.