TPS54340B-Q1 Datasheet, PDF (1/43 Pages) Texas Instruments – 4.5-V to 42-V Input, 3.5-A, Step-Down DC-DC Converter With Eco-Mode

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TPS54340B-Q1
SLVSDX5 – FEBRUARY 2017
TPS54340B-Q1 4.5-V to 42-V Input, 3.5-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 With 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 and 24-V Industrial, Automotive, and
Communications Power Systems
SPACE
Simplified Schematic
V_IN
VIN
TPS54340B-Q1
EN
BOOT
RT/CLK ^SW
V_OUT
R1
COMP
FB
R3
GND
Copyright © 2016, Texas Instruments Incorporated
1
3 Description
The TPS54340B-Q1 device is a 42-V, 3.5-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 146 μA. Shutdown supply
current is reduced to 1 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 for
optimization of either efficiency or external
component size. Frequency foldback and thermal
shutdown protects internal and external components
during an overload condition.
The TPS54340B-Q1 device is available in an 8-pin
thermally-enhanced HSOP PowerPAD package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54340B-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
V_OUT = 5V
70
V_OUT = 3.3V
60
50
40
30
20
10
V_IN = 12V
fsw = 600 kHz
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
I_O - Output Current - A
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.