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TPS54540 Datasheet(PDF) 3 Page - Texas Instruments

Part # TPS54540
Description  TPS54540 4.5 V to 42 V Input, 5 A, Step Down DC-DC Converter with Eco-mode?
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS54540 Datasheet(HTML) 3 Page - Texas Instruments

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background image
GND
7
COMP
6
FB
5
SW
8
2
3
4
1
VIN
EN
RT/CLK
BOOT
Thermal
Pad
9
TPS54540
www.ti.com
SLVSBX7A – MAY 2013 – REVISED MARCH 2014
6 Terminal Configuration and Functions
HSOIC Package
(Top View)
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.
A bootstrap capacitor is required between BOOT and SW. If the voltage on this capacitor is below the minimum
BOOT
1
O
required to operate the high side MOSFET, the output is switched off until the capacitor is refreshed.
VIN
2
I
Input supply voltage with 4.5 V to 42 V operating range.
Enable terminal, with internal pull-up current source. Pull below 1.2 V to disable. Float to enable. Adjust the
EN
3
I
input undervoltage lockout with two resistors. See the Enable and Adjusting Undervoltage Lockout section.
Resistor Timing and External Clock. An internal amplifier holds this terminal at a fixed voltage when using an
external resistor to ground to set the switching frequency. If the terminal is pulled above the PLL upper
RT/CLK
4
I
threshold, a mode change occurs and the terminal becomes a synchronization input. The internal amplifier is
disabled and the terminal is a high impedance clock input to the internal PLL. If clocking edges stop, the
internal amplifier is re-enabled and the operating mode returns to resistor frequency programming.
FB
5
I
Inverting input of the transconductance (gm) error amplifier.
Error amplifier output and input to the output switch current (PWM) comparator. Connect frequency
COMP
6
O
compensation components to this terminal.
GND
7
–
Ground
SW
8
I
The source of the internal high-side power MOSFET and switching node of the converter.
Thermal
GND terminal must be electrically connected to the exposed pad on the printed circuit board for proper
9
–
Pad
operation.
Copyright © 2013–2014, Texas Instruments Incorporated
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