TPS54331_16 Datasheet, PDF (1/36 Pages) Texas Instruments – TPS54331 3-A, 28-V Input, Step Down DC-DC Converter With Eco-mode

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TPS54331
SLVS839F – JULY 2008 – REVISED OCTOBER 2014
TPS54331 3-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 3-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 or
Thermally Enhanced SOIC8 PowerPAD™
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 TPS54331 device is a 28-V, 3-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
foldback and thermal shutdown protect the device
and the load in the event of an overload condition.
The TPS54331 device is available in an 8-pin SOIC
package and 8-pin SO PowerPAD package that have
been internally optimized to improve thermal
performance.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54331
SOIC (8)
SO PowerPAD (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
TPS54331D
BOOT
PH
SS
COMP
C_SS
C₁
C₂
R₃
VSENSE
GND
VIN
C_I
C_BOOT
L_O
D1
C_O
V_OUT
R_O1
R_O2
TPS54331 (D Package) Efficiency
100
90
80
70
V_I = 12 V
60
V_I = 18 V
V_I = 24 V
50
V_I = 28 V
40
V_I = 5 V
30
20
10
0
0.01
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.