TPS54541_15 Datasheet, PDF (1/52 Pages) Texas Instruments – TPS54541 4.5-V to 42-V Input, 5-A Step-Down DC-DC Converter With Soft-Start and Eco-mode™

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
TPS54541
SLVSC57A – OCTOBER 2013 – REVISED AUGUST 2015
TPS54541 4.5-V to 42-V Input, 5-A Step-Down DC-DC Converter
With Soft-Start and Eco-mode™
1 Features
•1 High Efficiency at Light Loads with Pulse Skipping
Eco-mode™
• 87-mΩ High-Side MOSFET
• 152-μA Operating Quiescent Current and
2-μA Shutdown Current
• 100-kHz to 2.5-MHz Adjustable Switching
Frequency
• Synchronizes to External Clock
• Low Dropout at Light Loads with Integrated BOOT
Recharge FET
• Adjustable UVLO Voltage and Hysteresis
• UV and OV Power-Good Output
• Adjustable Soft-Start and Sequencing
• 0.8-V 1% Internal Voltage Reference
• 10-Pin WSON with Thermal Pad Package
• –40°C to 150°C T_J Operating Range
• Supported by WEBENCH^® Software Tool
2 Applications
• Industrial Automation and Motor Control
• Vehicle Accessories: GPS (see SLVA412),
Entertainment
• USB-Dedicated Charging Ports and Battery
Chargers (see SLVA464)
• 12-V and 24-V Industrial, Automotive and
Communications Power Systems
Simplified Schematic
VIN
VIN PWRGD
TPS54541
EN
BOOT
RT/CLK
SS/TR
SW
VOUT
COMP
FB
GND
3 Description
The TPS54541 device is a 42-V 5-A step-down
regulator with an integrated high-side MOSFET. The
device survives load dump pulses up to 45 V per ISO
7637. Current mode control provides simple external
compensation and flexible component selection. A
low-ripple pulse-skip mode reduces the no-load
supply current to 152 μA. When the enable pin is
pulled low, the shutdown supply current is reduced to
2 μA .
Undervoltage lockout is internally set at 4.3 V but can
increase using an external resistor divider at the
enable pin. The output voltage startup ramp is
controlled by the soft-start pin that can also be
configured for sequencing and tracking. An open-
drain power-good signal indicates the output is within
93% to 106% of the nominal voltage.
A wide adjustable switching-frequency range allows
for optimization of either efficiency or external
component size. Cycle-by-cycle current limit,
frequency foldback, and thermal shutdown protect
internal and external components during an overload
condition.
The TPS54541 device is available in a 10-pin 4-mm ×
4-mm WSON package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54541
WSON (10)
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Efficiency vs Load Current
100
36 V to 12 V
95
90
85
12 V to 3.3 V
80
12 V to 5 V
75
70
65
V_OUT = 12 V, fsw = 620 kHz,
V_OUT = 5 V and 3.3 V, f sw = 400 kHz
60
0
0.5
1
1.5
2
2.5
3
3.5
I_O - Output Current (A)
C099
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.