TPS54231_16 Datasheet, PDF (1/31 Pages) Texas Instruments – 2-A, 28-V Input, Step-Down DC-DC Converter With Eco-mode

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
TPS54231
SLUS851D – OCTOBER 2008 – REVISED OCTOBER 2014
TPS54231 2-A, 28-V Input, Step-Down DC-DC Converter With Eco-mode™
1 Features
•1 3.5- to 28-V Input Voltage Range
• Adjustable Output Voltage Down to 0.8 V
• Integrated 80-mΩ High-Side MOSFET Supports
up to 2 A Continuous Output Current
• High Efficiency at Light Loads with a Pulse
Skipping Eco-mode™
• Fixed 570-kHz Switching Frequency
• Typical 1-μA Shutdown Quiescent Current
• Adjustable Slow-Start Limits Inrush Currents
• Programmable UVLO Threshold
• Overvoltage Transient Protection
• Cycle-by-Cycle Current Limit, Frequency Fold
Back and Thermal Shutdown Protection
• Available in Easy-to-Use SOIC8 Package
• Supported by WEBENCH^® Software Tool
(www.TI.com/WEBENCH)
2 Applications
• Consumer Applications such as Set-Top Boxes,
CPE Equipment, LCD Displays, Peripherals, and
Battery Chargers
• Industrial and Car Audio Power Supplies
• 5-V, 12-V and 24-V Distributed Power Systems
3 Description
The TPS54231 device is a 2-V, 2-A non-synchronous
buck converter that integrates a low R_DS(on) high-side
MOSFET. To increase efficiency at light loads, a
pulse skipping Eco-mode™ feature is automatically
activated. Furthermore, the 1-μA shutdown supply
current allows the device to be used in battery
powered applications. Current mode control with
internal slope compensation simplifies the external
compensation calculations and reduces component
count while allowing the use of ceramic output
capacitors. A resistor divider programs the hysteresis
of the input undervoltage lockout. An overvoltage
transient protection circuit limits voltage overshoots
during startup and transient conditions. A cycle-by-
cycle current limit scheme, frequency fold back and
thermal shutdown protect the device and the load in
the event of an overload condition. The TPS54231
device is available in an 8-pin SOIC package that has
been internally optimized to improve thermal
performance.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54231
SOIC (8)
4.90 mm × 3.90 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
Ren1
Ren2
EN
VIN
TPS54231
BOOT
PH
SS
COMP
C_SS
C₁
C₂
R₃
VSENSE
GND
VIN
C_I
C_BOOT
L_O
D1
C_O
VOUT
R_O1
R_O2
100
90
80
70
60
50
40
30
20
10
0
0.01
Efficiency
V_I = 12 V
V_I = 18 V
V_I = 24 V
V_I = 28 V
V_I = 5 V
V_O = 3.3 V
0.1
1
10
I_L - 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.