TPS54040-Q1 Datasheet, PDF (1/53 Pages) Texas Instruments – 0.5-A 42-V STEP-DOWN SWIFT™ DC/DC CONVERTER WITH Eco-mode™

TPS54040-Q1
www.ti.com
SLVSA26D – JANUARY 2010 – REVISED AUGUST 2012
0.5-A 42-V STEP-DOWN SWIFT™ DC/DC CONVERTER
WITH Eco-mode™
Check for Samples: TPS54040-Q1
FEATURES
1
•2 Qualified for Automotive Applications
• 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™ Control Scheme
• 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
• Undervoltage and Overvoltage Power-good
Output
• Adjustable Undervoltage Lockout Voltage and
Hysteresis
• 0.8-V Internal Voltage Reference
• Supported by SwitcherPro™ Software Tool
(http://focus.ti.com/docs/toolsw/folders/print/s
witcherpro.html)
• 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
• Aftermarket Auto Accessories: Video, GPS,
Entertainment
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, input supply current to 116 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 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 the output is within 92% to 109% 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 a 10-pin thermally enhanced MSOP PowerPAD™ package (DGQ) and a 10-pin
SON package (DRC).
SIMPLIFIED SCHEMATIC
VIN
PWRGD
TPS54040
EFFICIENCY
vs
LOAD CURRENT
100
90
80
EN
BOOT
70
60
PH
50
SS /TR
RT /CLK
COMP
VSENSE
GND
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
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, SwitcherPro, SWIFT, PowerPAD are trademarks of Texas Instruments.
2
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