TPS54540-Q1_15 Datasheet, PDF (1/44 Pages) Texas Instruments – Step-Down DC-DC Converter With Eco-mode

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TPS54540-Q1
SLVSC56B – SEPTEMBER 2013 – REVISED NOVEMBER 2015
TPS54540-Q1 4.5-V to 42-V Input, 5-A, Step-Down DC-DC Converter With Eco-mode™
1 Features
•1 Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 1: –40°C to 125°C
Ambient Operating Temperature Range
– Device HBM ESD Classification Level H1C
– Device CDM ESD Classification Level C3B
• High-Efficiency at Light Loads With Pulse-
Skipping Eco-mode™
• 92-mΩ High-Side MOSFET
• 146-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
• 0.8-V 1% Internal Voltage Reference
• 8-Pin HSOP PowerPAD™ Package
• –40°C to 150°C T_J Operating Range
• Supported by WEBENCH® Software Tool
2 Applications
• Vehicle Accessories: GPS (See SLVA412),
Entertainment, ADAS, eCall
• USB-Dedicated Charging Ports and Battery
Chargers (See SLVA464)
• Industrial Automation and Motor Control
• 12-V, 24-V, and 48-V Industrial, Automotive, and
Communications Power Systems
SPACE
Simplified Schematic
V_IN
VIN
BOOT
TPS54540-Q1
EN
SW
V_OUT
COMP
RT/CLK
FB
GND
3 Description
The TPS54540-Q1 device is a 42-V, 5-A, step-down
regulator with an integrated high-side MOSFET. The
device survives load-dump pulses up to 65 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 146 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
be increased using an external resistor divider at the
enable pin. The output voltage start-up ramp is
internally controlled to provide a controlled start-up
and eliminate overshoot.
A wide adjustable frequency range allows either
efficiency or external component size to be optimized.
Output current is limited cycle-by-cycle. Frequency
foldback and thermal shutdown protect internal and
external components during an overload condition.
The TPS54540-Q1 is available in an 8-pin thermally-
enhanced HSOP PowerPAD package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54540-Q1
HSOP (8)
4.89 mm × 3.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Efficiency vs Load Current
100
90
80
70
60
50
40
30
20
VS_INe=rie1s21 V
10
VS_INe=rie3s62V
0
VS_INe=rie6s04V
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
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.