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TPS54040ADGQ Datasheet(PDF) 3 Page - Texas Instruments

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No. de pieza TPS54040ADGQ
Descripción Electrónicos  Step-Down DC-DC Converter
Download  53 Pages
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TPS54040ADGQ Datasheet(HTML) 3 Page - Texas Instruments

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1
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3
4
5
6
7
9
8
10
Thermal
Pad
(11)
BOOT
VIN
EN
PH
GND
COMP
VSENSE
PWRGD
SS/TR
RT/CLK
1
2
3
4
5
6
7
9
8
10
Thermal
Pad
(11)
BOOT
VIN
EN
PH
GND
COMP
VSENSE
PWRGD
SS/TR
RT/CLK
TPS54040A
www.ti.com
SLVSB58B – MARCH 2012 – REVISED JANUARY 2016
5 Pin Configuration and Functions
DRC Package and DGQ Package
10-Pin VSON and 10-Pin MSOP-PowerPAD
Top View
Pin Functions
PIN
I/O
DESCRIPTION
NO.
NAME
A bootstrap capacitor is required between BOOT and PH. If the voltage on this capacitor is below the
1
BOOT
O
minimum required by the output device, the output is forced to switch off until the capacitor is refreshed.
Error amplifier output, and input to the output switch current comparator. Connect frequency compensation
8
COMP
O
components to this pin.
Enable pin, internal pull-up current source. Pull below 1.2V to disable. Float to enable. Adjust the input
3
EN
I
undervoltage lockout with two resistors.
9
GND
Ground
10
PH
I
The source of the internal high-side power MOSFET.
An open drain output, asserts low if output voltage is low due to thermal shutdown, dropout, over-voltage or
6
PWRGD
O
EN shut down.
Resistor Timing and External Clock. An internal amplifier holds this pin at a fixed voltage when using an
external resistor to ground to set the switching frequency. If the pin is pulled above the PLL upper threshold,
5
RT/CLK
I
a mode change occurs and the pin becomes a synchronization input. The internal amplifier is disabled and
the pin is a high impedance clock input to the internal PLL. If clocking edges stop, the internal amplifier is re-
enabled and the mode returns to a resistor set function.
Slow-start and Tracking. An external capacitor connected to this pin sets the output rise time. Since the
4
SS/TR
I
voltage on this pin overrides the internal reference, it can be used for tracking and sequencing.
2
VIN
I
Input supply voltage, 3.5 V to 42 V.
7
VSENSE
I
Inverting input of the transconductance (gm) error amplifier.
11
Thermal Pad
GND pin must be electrically connected to the exposed pad on the printed circuit board for proper operation.
Copyright © 2012–2016, Texas Instruments Incorporated
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