TPS54240_15 Datasheet, PDF (1/56 Pages) Texas Instruments – TPS54240 3.5-V to 42-V Step-Down DC - DC Converter With Eco-Mode™

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TPS54240
SLVSAA6B – APRIL 2010 – REVISED NOVEMBER 2014
TPS54240 3.5-V to 42-V Step-Down DC - DC Converter With Eco-Mode™
1 Features
•1 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™
• 138-μA Operating Quiescent Current
• 1.3-μA Shutdown Current
• 100-kHz to 2.5-MHz Switching Frequency
• Synchronizes to External Clock
• Adjustable Slow Start and Sequencing
• UV and OV Power Good Output
• Adjustable UVLO Voltage and Hysteresis
• 0.8-V Internal Voltage Reference
• 10-Pin HVSSOP and 10-Pin 3-mm x 3-mm VSON
Packages with PowerPAD™
• Supported by WEBENCH^® Software Tool
2 Applications
• 12-V and 24-V Industrial and Commercial Low-
Power Systems
• GSM, GPRS Modules in Fleet Management,
eMeters, and Security Systems
3 Description
The TPS54240 device is a 42-V, 2.5-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 138 μA. Using the
enable pin, shutdown supply current is reduced to 1.3
μA, when the enable pin is low.
Undervoltage lockout is internally set at 2.5 V, but it
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 and
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 optimization of external component size.
Frequency foldback and thermal shutdown protects
the part during an overload condition.
The TPS54240 is available in 10-pin, thermally-
enhanced HVSSOP and 10-pin 3-mm x 3-mm
PowerPAD package.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
TPS54240
HVSSOP (10)
VSON (10)
3.00 mm x 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic
V_IN
VIN
PWRGD
TPS54240
EN
BOOT
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
VIN=12V
VOUT=3.3V
fsw=300kHz
0.5
1.0
1.5
2.0
2.5
3.0
I_O - Output Current - A
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.