TPS54531_15 Datasheet, PDF (1/32 Pages) Texas Instruments – TPS54531 5-A, 28-V Input, Step-Down SWIFT™ DC-DC Converter With Eco-mode™

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TPS54531
SLVSBI5A – MAY 2013 – REVISED OCTOBER 2014
TPS54531 5-A, 28-V Input, Step-Down SWIFT™ 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 5-A Continuous Output Current
• High Efficiency at Light Loads with a Pulse
Skipping Eco-mode™
• Fixed 570kHz Switching Frequency
• Typical 1μA 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 Thermally Enhanced
8-Pin SO PowerPAD^TM Package
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 TPS54531 device is a 28-V, 5-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 under-voltage 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
TPS54531 device is available in 8-pin SO
PowerPAD^TM package that has been internally
optimized to improve thermal performance.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54531
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
TPS54531
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
TPS54531 Efficiency
100
90
80
70
V_IN = 12 V
V_IN = 24 V
60
50
40
30
20
10
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Output Current - A
C007
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.