TPS5401 Datasheet, PDF (1/37 Pages) Texas Instruments – 0.5-A, 42-V Input, Step-Down SWIFT™ Converter

TPS5401
www.ti.com
0.5-A, 42-V Input, Step-Down SWIFT™ Converter
Check for Samples: TPS5401
SLVSAB0 – DECEMBER 2010
FEATURES
1
•2 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-mA Operating Quiescent Current
• 1.3-mA 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 ±3.5% Internal Voltage Reference
• MSOP10 With PowerPAD™ Package
• Supported by SwitcherPro™ Software Tool
(http://focus.ti.com/docs/toolsw/folders/print/s
witcherpro.html)
• For SWIFT™ Power Products Documentation,
See the TI Web Site at http://www.ti.com/swift
APPLICATIONS
• 12-V and 24-V Industrial and Commercial
Low-Power Systems
• E-Meters
DESCRIPTION
The TPS5401 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 supply current to 116 mA when outputting regulated voltage with no load. Using the enable pin,
shutdown supply current is reduced to 1.3 mA 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
start-up 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 optimization. Frequency
foldback and thermal shutdown protect the part during an overload condition.
The TPS5401 is available in a 10-pin thermally enhanced MSOP PowerPAD package.
SPACER
SIMPLIFIED SCHEMATIC
V_IN
CIN
VIN
PWRGD
TPS5401
EN
SS/TR
RT/CLK
BOOT
PH
CBOOT
LOUT
COUT
RT
R3
COMP _VSENSE
CSS
C2
C1
GND
V_OUT
R1
R2
100
90
80
70
60
50
40
30
20
10
0
0
EFFICIENCY
vs
LOAD CURRENT
V_IN = 12 V
V_OUT = 5 V
f_SW = 700 kHz
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, PowerPAD, SwitcherPro, SWIFT 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, Texas Instruments Incorporated