TPS54140A
www.ti.com
SLVSB55A –MAY 2012–REVISED JULY 2012
1.5-A, 42 V Step Down
SWIFT™ DC/DC Converter with Eco-mode™
Check for Samples: TPS54140A
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FEATURES
23
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3.5 V to 42 V Input Voltage Range
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0.8-V Internal Voltage Reference
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200-mΩ High-Side MOSFET
MSOP10 and 3mm x 3mm VSON-10 Package
With PowerPAD™
Supported by WEBENCH® and SwitcherPro™
Software Tool
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High Efficiency at Light Loads with a Pulse
Skipping Eco-mode™
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Tighter Enable Threshold than TPS54140 for
More Accurate UVLO Voltage
For SWIFT™ Documentation, See the TI
Website at http://www.ti.com/swift
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Adjustable UVLO Voltage and Hysteresis
116 μA Operating Quiescent Current
1.3 μA Shutdown Current
APPLICATIONS
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12-V and 24-V Industrial and Commercial Low
Power Systems
100 kHz to 2.5 MHz Switching Frequency
Synchronizes to External Clock
Adjustable Slow Start/Sequencing
UV and OV Power Good Output
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Aftermarket Auto Accessories: Video, GPS,
Entertainment
DESCRIPTION
The TPS54140A device is a 42 V, 1.5 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 output supply current to 116 μA. Using the enable pin, shutdown supply
current is reduced to 1.3 μA.
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/tracking. An open
drain power good signal indicates 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.
SIMPLIFIED SCHEMATIC
EFFICIENCY
vs
LOAD CURRENT
VIN
PWRGD
VIN
TPS54140A
90
85
80
75
70
65
60
55
50
BOOT
PH
EN
VOUT
SS/TR
RT/CLK
COMP
VSENSE
GND
VI = 12 V,
VO = 3.3 V,
fsw = 1200 kHz
0
0.25
0.50 0.75
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1.25 1.50
1.75
2
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, PowerPAD, SwitcherPro, SWIFT are trademarks of Texas Instruments.
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WEBENCH is a registered trademark of Texas Instruments.
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, Texas Instruments Incorporated