TPS54040_16 Datasheet, PDF (1/51 Pages) Texas Instruments – Step Down DC/DC Converter

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TPS54040
SLVS918B – MARCH 2009 – REVISED JANUARY 2016
TPS54040 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™
• 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
• Adjustable UVLO Voltage and Hysteresis
• 0.8-V Internal Voltage Reference
• MSOP10 Package With PowerPAD™
• Supported by SwitcherPro™ Software Tool
(http://focus.ti.com/docs/toolsw/folders/print/switch
erpro.html)
2 Applications
• 12-V and 24-V Industrial and Commercial Low
Power Systems
• Aftermarket Auto Accessories: Video, GPS,
Entertainment
Simplified Schematic
VIN
PWRGD
TPS54040
EN
BOOT
PH
SS /TR
RT /CLK
COMP
VSENSE
GND
3 Description
The TPS54040 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 output supply current to 116 μA. Using the
enable pin, shutdown supply current is reduced to 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/tracking. An open drain power good
signal indicates the output is within 93% 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 TPS54040 is available in 10-pin thermally
enhanced HVSSOP PowerPAD package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54040
HVSSOP (10)
3.00 mm x 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency vs Load Current
V_I = 12 V,
V_O = 5.0 V,
f_sw = 700 kHz
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.