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TPS54341
SLVSC61A – NOVEMBER 2013 – REVISED OCTOBER 2016
TPS54341 4.5-V to 42-V Input, 3.5-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 WSON with Thermal Pad Package • –40°C to 150°C TJ Operating Range • Supported by WEBENCH® Software Tool
2 Applications
• Industrial Automation and Motor Control • Vehicle Accessories: GPS and Entertainment (see
Creating GSM/GRPS Power Supply from TPS54260, SLVA412) • USB-Dedicated Charging Ports and Battery Chargers (see Creating a Universal Car Charger for USB devices From the TPS54240 and TPS2511, SLVA464) • 12-V and 24-V Industrial, Automotive and Communications Power Systems
3 Description
The TPS54341 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 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 startup 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 the 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 TPS54341 device is available in a 10-pin 4-mm × 4-mm WSON package.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54341
WSON (10)
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
Simplified Schematic
VIN
VIN PWRGD
TPS54341
EN
BOOT
RT/CLK
SS/TR
SW
VOUT
COMP FB
GND
Copyright © 2016, Texas Instruments Incorporated
Efficiency (%)
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
VOUT = 12 V, fsw = 620 kHz,
VOUT = 5 V and 3.3 V, f sw = 400 kHz
60
0
0.5
1
1.5
2
2.5
3
3.5
IO - Output Current (A)
C099
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.
TPS54341
SLVSC61A – NOVEMBER 2013 – REVISED OCTOBER 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1 2 Applications ........................................................... 1 3 Description ............................................................. 1 4 Revision History..................................................... 2 5 Pin Configuration and Functions ......................... 3 6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4 6.2 ESD Ratings.............................................................. 4 6.3 Recommended Operating Conditions ...................... 4 6.4 Thermal Information .................................................. 4 6.5 Electrical Characteristics........................................... 5 6.6 Typical Characteristics .............................................. 7 7 Detailed Description ............................................ 12 7.1 Overview ................................................................. 12 7.2 Functional Block Diagram ....................................... 13 7.3 Feature Description................................................. 13 7.4 Device Functional Modes........................................ 27
8 Application and Implementation ........................ 28 8.1 Application Information .......................................... 28 8.2 Typical Application .................................................. 28
9 Power Supply Recommendations...................... 41 10 Layout................................................................... 42
10.1 Layout Guidelines ................................................. 42 10.2 Layout Example .................................................... 42 11 Device and.