TPS54340_15 Datasheet, PDF (1/44 Pages) Texas Instruments – TPS54340 42 V Input, 3.5 A, Step Down DC-DC Converter with Eco-mode™

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TPS54340
SLVSBK0B – OCTOBER 2012 – REVISED MARCH 2014
TPS54340 42 V Input, 3.5 A, Step Down DC-DC Converter with Eco-mode™
1 Features
•1 4.5 V to 42 V (45 V Abs Max) Input Range
• 3.5 A Continuous Current, 4.5 A Minimum Peak
Inductor Current Limit
• Current Mode Control DC-DC Converter
• 92-mΩ High-Side MOSFET
• High Efficiency at Light Loads with Pulse Skipping
Eco-mode™
• Low Dropout at Light Loads with Integrated BOOT
Recharge FET
• 146 μA Operating Quiescent Current
• 1 μA Shutdown Current
• 100 kHz to 2.5 MHz Fixed Switching Frequency
• Synchronizes to External Clock
• Adjustable UVLO Voltage and Hysteresis
• Internal Soft-Start
• Accurate Cycle-by-Cycle Current Limit
• Thermal, Overvoltage, and Frequency Foldback
Protection
• 0.8 V 1% Internal Voltage Reference
• 8-Terminal HSOIC with PowerPAD™ Package
• –40°C to 150°C T_J Operating Range
• Supported by WEBENCH™ Software Tool
2 Applications
12 V, 24 V Industrial, Automotive and
Communications Power Systems
3 Description
The TPS54340 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 the enable pin. The output voltage
start up ramp is internally controlled to provide a
controlled start up and eliminate overshoot.
A wide switching frequency range allows either
efficiency or external component size to be optimized.
Frequency foldback and thermal shutdown protects
internal and external components during an overload
condition.
The TPS54340 is available in an 8-terminal thermally
enhanced HSOIC PowerPAD™ package.
Device Information
ORDER NUMBER
PACKAGE
BODY SIZE
TPS54340DDA
HSOIC (8)
4,89mm x 3,9mm
spacer
spacer
4 Simplified Schematic
V_IN
VIN
TPS54340
EN
BOOT
RT/CLK ^SW
COMP
FB
GND
V_OUT
R1
R3
Figure 1. Efficiency vs Load Current
100
90
80
V_OUT = 5V
70
60
V_OUT = 3.3V
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
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.