TPS54318_15 Datasheet, PDF (3/40 Pages) Texas Instruments – TPS54318 2.95-V to 6-V Input, 3-A Output, 2-MHz , Synchronous Step-Down Switcher With Integrated FETs (SWIFT™)

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6 Pin Configuration and Functions
TPS54318
SLVS975B – SEPTEMBER 2009 – REVISED DECEMBER 2014
RTE (WQFN) PACKAGE
16 PINS
(TOP VIEW)
16 15 14 13
VIN 1
12 PH
VIN 2
GND 3
Thermal
Pad
GND 4
567
11 PH
10 PH
9 SS
8
PIN
NAME
NO.
AGND
5
BOOT
13
COMP
7
EN
15
3
GND
4
10
PH
11
12
PWRGD
14
RT/CLK
8
SS
9
1
VIN
2
16
VSENSE
6
Thermal Pad
Pin Functions
I/O ⁽¹⁾
DESCRIPTION
G Analog ground should be electrically connected to GND close to the device.
I
A bootstrap capacitor is required between BOOT and PH. If the voltage on this capacitor is below the
minimum required by the BOOT UVLO, the output is forced to switch off until the capacitor is refreshed.
O
Error amplifier output, and input to the output switch current comparator. Connect frequency
compensation components to this pin.
I
Enable pin, internal pull-up current source. Pull below 1.2 V to disable. Float to enable. Can be used to
set the on/off threshold (adjust UVLO) with two additional resistors.
G Power ground. This pin should be electrically connected directly to the power pad under the device.
O
The source of the internal high-side power MOSFET, and drain of the internal low-side (synchronous)
rectifier MOSFET.
O
An open drain output, asserts low if output voltage is low due to thermal shutdown, overcurrent,
over/under-voltage or EN shut down.
I/O Resistor Timing or External Clock input pin.
I/O Slow-start. An external capacitor connected to this pin sets the output voltage rise time. Soft
I
Input supply voltage, 2.95 V to 6 V.
I
Inverting node of the transconductance (gm) error amplifier.
G
GND pin should be connected to the exposed power pad for proper operation. This power pad should
be connected to any internal PCB ground plane using multiple vias for good thermal performance.
(1) I = Input, O = Output, G = Ground
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