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SLVSAA6 – APRIL 2010
3.5V to 42V STEP DOWN SWIFT™ DC/DC CONVERTER WITH ECO-MODE™
Check for Samples:
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FEATURES
3.5V to 42V Input Voltage Range
200-mΩ High-Side MOSFET
High Efficiency at Light Loads with a Pulse
Skipping Eco-Mode™
138mA Operating Quiescent Current
1.3mA Shutdown Current
100kHz to 2.5MHz Switching Frequency
Synchronizes to External Clock
Adjustable Slow Start/Sequencing
UV and OV Power Good Output
Adjustable UVLO Voltage and Hysteresis
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0.8-V Internal Voltage Reference
MSOP10 Package With PowerPAD™
Supported by SwitcherPro™ Software Tool
For SWIFT™ Documentation, See the TI
Website at
APPLICATIONS
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12-V and 24-V Industrial and Commercial Low
Power Systems
GSM, GPRS Modules in Fleet Management,
E-Meters, and Security Systems
DESCRIPTION
The TPS54240 device is a 42V, 2.5A, 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 138mA. Using the enable pin, shutdown supply current is
reduced to 1.3mA, when the enable pin is low.
Under voltage lockout is internally set at 2.5V, 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.
The TPS54240 is available in 10 pin thermally enhanced MSOP Power Pad™ package.
SIMPLIFIED SCHEMATIC
100
90
EFFICIENCY vs LOAD CURRENT
VIN
PWRGD
80
TPS54240
Efficiency - %
70
60
50
40
30
20
EN
BOOT
PH
SS /TR
RT /CLK
COMP
VSENSE
VIN=12V
VOUT=3.3V
fsw=300kHz
10
0
0
0.5
GND
1.0
1.5
2.0
I
O
- Output Current - A
2.5
3.0
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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.
Copyright © 2010, 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.
TI [ TEXAS INSTRUMENTS ]
