TPS54040A_16 Datasheet, PDF (1/53 Pages) Texas Instruments – Step-Down DC-DC Converter

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TPS54040A
SLVSB58B – MARCH 2012 – REVISED JANUARY 2016
TPS54040A 0.5-A, 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™
• 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
2 Applications
• 12-V and 24-V Industrial and Commercial Low
Power Systems
• Aftermarket Auto Accessories: Video, GPS,
Entertainment
Simplified Schematic
V_IN
VIN
PWRGD
TPS54040A
BOOT
EN
SS /TR
PH
RT /CLK
COMP
VSENSE
V_OUT
GND
3 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54040A
MSOP-PowerPAD
(10)
VSON (10)
3.00 mm × 3.00 mm
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
SPACER
Efficiency vs Load Current
100
90
80
70
60
50
40
30
V_I = 12 V,
20
V_O = 5.0 V,
f_sw = 700 kHz
10
0
0
0.1
0.2
0.3
0.4
0.5
Load 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.