TPS54561_15 Datasheet, PDF (1/53 Pages) Texas Instruments – TPS54561 4.5-V to 60-V Input, 5-A, Step-Down DC-DC Converter with Soft-Start and Eco-mode™

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TPS54561
SLVSBO1D – JULY 2013 – REVISED JULY 2015
TPS54561 4.5-V to 60-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 SON 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, 24-V and 48-V Industrial, Automotive and
Communications Power Systems
Simplified Schematic
VIN
VIN PWRGD
TPS54561
EN
BOOT
RT/CLK
SS/TR
SW
VOUT
COMP
FB
GND
3 Description
The TPS54561 is a 60-V, 5-A, step down regulator
with an integrated high side MOSFET. The device
survives load dump pulses up to 65V 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 start up ramp is
controlled by the soft start pin that can also be
configured for sequencing/tracking. An open drain
power good signal indicates the output is within 93%
to 106% of its 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 TPS54561 is available in an 10-pin 4-mm × 4-
mm WSON package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54561
WSON (10)
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
space
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
60
0
V_OUT = 12 V, fsw = 620kHz,
V_OUT = 5 V and 3.3 V, f sw = 400 kHz
1
2
3
4
5
I_O - Output Current (A)
C024
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.