TPS54541 Datasheet, PDF (1/48 Pages) Texas Instruments – 4.5-V to 42-V Input, 5-A Step-Down DC-DC Converter With Soft-Start and Eco-mode

TPS54541
www.ti.com
SLVSC57 – OCTOBER 2013
4.5-V to 42-V Input, 5-A Step-Down DC-DC Converter With Soft-Start and Eco-mode™
Check for Samples: TPS54541
FEATURES
1
•23 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 SON with Thermal Pad Package
• –40°C to 150°C T_J Operating Range
• Supported by WEBENCH^® Software Tool
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
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. Shutdown supply current is
reduced to 2 μA when the enable pin is pulled low.
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 protects
internal and external components during an overload
condition.
The TPS54541 device is available in a 10-pin 4-mm ×
4-mm SON package.
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SIMPLIFIED SCHEMATIC
EFFICIENCY vs LOAD CURRENT
VIN
VIN PWRGD
TPS54541
EN
BOOT
RT/CLK
SS/TR
SW
COMP
FB
VOUT
100
36 V to 12 V
95
90
85
12 V to 3.3 V
80
12 V to 5 V
75
70
GND
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
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 is a trademark of Texas Instruments.
2
WEBENCH is a registered trademark of Texas Instruments.
3
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 © 2013, Texas Instruments Incorporated