TPS54540 Datasheet, PDF (1/38 Pages) Texas Instruments – 4.5 V to 42 V Input, 5 A, Step Down DC-DC Converter with Eco-mode™

TPS54540
www.ti.com
SLVSBX7 – MAY 2013
4.5 V to 42 V Input, 5 A, Step Down DC-DC Converter with Eco-mode™
Check for Samples: TPS54540
FEATURES
1
•2 High Efficiency at Light Loads with Pulse
Skipping Eco-mode™
• 92-mΩ High-Side MOSFET
• 146 μA Operating Quiescent Current and
2 μA Shutdown Current
• 100 kHz to 2.5 MHz Fixed Switching Frequency
• Synchronizes to External Clock
• Low Dropout at Light Loads with Integrated
BOOT Recharge FET
• Adjustable UVLO Voltage and Hysteresis
• 0.8 V 1% Internal Voltage Reference
• 8-Pin HSOIC with PowerPAD™ Package
• –40°C to 150°C T_J Operating Range
• Supported by WEBENCH™ Software Tool
APPLICATIONS
• Industrial Automation and Motor Control
• Vehicle Accessories: GPS, Entertainment
• USB Dedicated Charging Ports and Battery
Chargers
• 12 V and 24 V Industrial, Automotive and
Communications Power Systems
DESCRIPTION
The TPS54540 is a 42 V, 5 A, step down regulator with an integrated high side MOSFET. The device survives
load dump pulses up to 45V 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 μA.
Shutdown supply current is reduced to 2 μA 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. Output
current is limited cycle-by-cycle. Frequency foldback and thermal shutdown protects internal and external
components during an overload condition.
The TPS54540 is available in an 8-pin thermally enhanced HSOIC PowerPAD™ package.
SIMPLIFIED SCHEMATIC
V_IN
VIN
BOOT
EFFICIENCY vs LOAD CURRENT
100
36 V to 12 V
95
TPS54540
EN
SW
COMP
90
V_OUT
85
80
75
12 V to 3.3 V
12 V to 5 V
70
RT/CLK
FB
GND
65
V_OUT = 12 V, fsw = 800kHz,
V_OUT = 5 V and 3.3 V, f sw = 400 kHz
60
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
I_O - Output Current (A)
C024
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.
Eco-mode, PowerPAD, WEBENCH 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 © 2013, Texas Instruments Incorporated