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TPS57040-Q1 Datasheet(PDF) 5 Page - Texas Instruments

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Part # TPS57040-Q1
Description  0.5-A 42-V STEP-DOWN SWIFT??DC/DC CONVERTER WITH Eco-mode?
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS57040-Q1 Datasheet(HTML) 5 Page - Texas Instruments

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DGQ PACKAGE
(TOP VIEW)
PH
GND
COMP
VSENSE
BOOT
VIN
EN
SS/TR
1
2
3
4
10
9
8
7
4
PWRGD
RT/CLK
6
5
Thermal
Pad
(11)
DRC PACKAGE
(TOP VIEW)
PH
GND
COMP
VSENSE
BOOT
VIN
EN
SS/TR
1
2
3
4
10
9
8
7
4
PWRGD
RT/CLK
6
5
Thermal
Pad
(11)
TPS57040-Q1
www.ti.com
SLVSAP4B – DECEMBER 2010 – REVISED AUGUST 2012
DEVICE INFORMATION
PIN CONFIGURATION
PIN FUNCTIONS
PIN
I/O
DESCRIPTION
NAME
NO.
A bootstrap capacitor is required between BOOT and PH. If the voltage on this capacitor is below the
BOOT
1
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
COMP
8
O
components to this pin.
Enable pin, internal pull-up current source. Pull below 1.2 V to disable. Float to enable. Adjust the input
EN
3
I
undervoltage lockout with two resistors.
GND
9
Ground
PH
10
I
The source of the internal high-side power MOSFET.
Thermal Pad
11
GND pin must be electrically connected to the exposed pad on the printed circuit board for proper operation.
An open drain output, asserts low if output voltage is low due to thermal shutdown, dropout, over-voltage or
PWRGD
6
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,
RT/CLK
5
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
SS/TR
4
I
voltage on this pin overrides the internal reference, it can be used for tracking and sequencing.
VIN
2
I
Input supply voltage, 3.5 V to 42 V.
VSENSE
7
I
Inverting node of the transconductance ( gm) error amplifier.
Copyright © 2010–2012, Texas Instruments Incorporated
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