TPS54340-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

TPS54340-Q1
www.ti.com
SLVSBZ1 – SEPTEMBER 2013
4.5-V to 42-V Input, 3.5-A, Step-Down DC-DC Converter with Eco-mode™
Check for Samples: TPS54340-Q1
FEATURES
1
APPLICATIONS
•23 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 HSOIC with PowerPAD™ Package
• –40°C to 150°C T_J Operating Range
• Supported by WEBENCH^® Software Tool
• 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
DESCRIPTION
The TPS54340-Q1 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 startup
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.
SIMPLIFIED SCHEMATIC
V_IN
VIN
The TPS54340-Q1 is available in an 8-pin thermally-
enhanced HSOIC PowerPAD package.
EFFICIENCY vs LOAD CURRENT
100
90
TPS54340-Q1
80
EN
BOOT
RT/CLK ^SW
COMP
FB
GND
V_OUT
R1
R3
70
60
50
V_IN = 12V
fsw = 600 kHz
40
30
20
10
V_OUT = 3.3V
V_OUT = 5V
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
I_O - Output Current - A
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, PowerPAD are trademarks 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