TPS54040A_15 Datasheet, PDF (1/52 Pages) Texas Instruments – 0.5 A, 42 V Step Down DC/DC Converter with Eco-mode™

TPS54040A
www.ti.com
SLVSB58A – MARCH 2012 – REVISED JANUARY 2014
0.5 A, 42 V Step Down DC/DC Converter with Eco-mode™
Check for Samples: TPS54040A
FEATURES
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•23 3.5 V to 42 V Input Voltage Range
• 200-mΩ High-Side MOSFET
• High Efficiency at Light Loads with a Pulse
Skipping Eco-mode™
• Tighter Enable Threshold than TPS54040
for More Accurate UVLO Voltage
• Adjustable UVLO Voltage and Hysteresis
• 116 μA Operating Quiescent Current
• 1.3 μA Shutdown Current
• 100 kHz to 2.5 MHz Switching Frequency
• Synchronizes to External Clock
• Adjustable Slow Start/Sequencing
• UV and OV Power Good Output
• 0.8-V Internal Voltage Reference
• Available in MSOP-10 and VSON-10 Packages
• Supported by WEBENCH^® and SwitcherPro™
Software Tool
APPLICATIONS
• 12-V and 24-V Industrial and Commercial Low
Power Systems
• Aftermarket Auto Accessories: Video, GPS,
Entertainment
DESCRIPTION
The TPS54040A device is a 42 V, 0.5 A, step down regulator with an integrated high side MOSFET. Current
mode control provides simple external compensation and flexible component selection. A low ripple pulse skip
mode reduces the no load, regulated input supply current to 116 μA. Using the enable pin, shutdown supply
current is nominally 1.3 μA when the enable pin is low.
Under voltage lockout is internally set at 2.5 V, but can be increased using the enable pin. The output voltage
startup ramp is controlled by the slow start pin that can also be configured for sequencing or tracking. An open
drain power good signal indicates when the output is within 94% to 107% of its nominal voltage.
A wide switching frequency range allows efficiency and external component size to be optimized. Frequency fold
back and thermal shutdown protects the part during an overload condition.
SPACER
V_IN
SIMPLIFIED SCHEMATIC
VIN
PWRGD
TPS54040A
BOOT
EN
SS /TR
PH
RT /CLK
COMP
VSENSE
GND
V_OUT
100
90
80
70
60
50
40
30
20
10
0
0
EFFICIENCY
vs
LOAD CURRENT
V_I = 12 V,
V_O = 5.0 V,
f_sw = 700 kHz
0.1
0.2
0.3
0.4
0.5
Load Current - A
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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.
Eco-mode, SwitcherPro are trademarks of Texas Instruments.
2
WEBENCH is a registered trademark of Texas Instruments.
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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 © 2012–2014, Texas Instruments Incorporated