TPS54240_14 Datasheet, PDF (1/54 Pages) Texas Instruments – 3.5V to 42V STEP DOWN SWIFT™ DC/DC CONVERTER WITH ECO-MODE™

DGQ
DRC
TPS54240
www.ti.com
SLVSAA6A – APRIL 2010 – REVISED DECEMBER 2012
3.5V to 42V STEP DOWN SWIFT™ DC/DC CONVERTER WITH ECO-MODE™
Check for Samples: TPS54240
FEATURES
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•2 3.5V to 42V Input Voltage Range
• 200-mΩ High-Side MOSFET
• High Efficiency at Light Loads with a Pulse
Skipping Eco-Mode™
• 138μA Operating Quiescent Current
• 1.3μA 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
• 0.8-V Internal Voltage Reference
• 10-Pin MSOP and 10-Pin 3mm × 3mm SON
Packages with PowerPAD™
• Supported by WEBENCH™ Software Tool
• For SWIFT™ Documentation, See the TI
Website at http://www.ti.com/swift
APPLICATIONS
• 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 138μA. Using the enable pin, shutdown supply current is
reduced to 1.3μA, 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 and 10-pin 3mm x 3mm SON Power Pad™
package.
SIMPLIFIED SCHEMATIC
EFFICIENCY vs LOAD CURRENT
100
V_IN
VIN
PWRGD
90
TPS54240
80
70
BOOT
EN
60
SS /TR
PH
RT /CLK
COMP
VSENSE
50
V_OUT
40
30
20
10
VIN=12V
VOUT=3.3V
fsw=300kHz
GND
0
0
0.5
1.0
1.5
2.0
2.5
3.0
I_O - Output 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, WEBENCH, SWIFT are trademarks 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 © 2010–2012, Texas Instruments Incorporated