1 Features

1• Two, 30-mΩ (typical) MOSFETs for High-

Efficiency at 3-A loads

• Switching Frequency: 200 kHz to 2 MHz

• Voltage Reference Over Temperature: 0.8 V ± 1%

• Synchronizes to External Clock

• Adjustable Soft Start/Sequencing

• UV and OV Power-Good Output

• Low Operating and Shutdown Quiescent Current

• Safe Start-Up into Prebiased Output

• Cycle-by-Cycle Current Limit, Thermal and

Frequency Foldback Protection

• Operating Junction Temperature Range: –40°C to

150°C

• Thermally Enhanced 3 mm × 3 mm 16-pin WQFN

Package

• Create a Custom Design Using the TPS54318

With the WEBENCH® Power Designer

2 Applications

• Low-Voltage, High-Density Power Systems

• Point-of-Load Regulation for High Performance

DSPs, FPGAs, ASICs and Microprocessors

• Broadband, Networking and Optical

Communications Infrastructure

3 Description

TheTPS54318 device is a full-featured, 6-V, 3-A,

synchronous, step-down current-mode converter with

two integrated MOSFETs.

The TPS54318 device enables small designs by

integrating the MOSFETs, implementing current

mode control to reduce external component count,

reducing inductor size by enabling up to 2-MHz

switching frequency, and minimizing the device

footprint with a small, 3 mm x 3 mm, thermally

enhanced, QFN package.

The TPS54318 device provides accurate regulation

for a variety of loads with an accurate ±1% voltage

reference (VREF) over temperature.

Efficiency is maximized through the integrated 30-mΩ

MOSFETs and a 350-μA typical supply current. Using

the EN pin, shutdown supply current is reduced to 2

μA by entering a shutdown mode.

Undervoltage lockout is internally set at 2.6 V, but

can be increased by programming the threshold with

a resistor network on the enable pin. The output

voltage startup ramp is controlled by the soft-start pin.

An open-drain power-good signal indicates the output

is within 93% to 107% of its nominal voltage.

Frequency foldback and thermal shutdown protects

the device during an overcurrent condition.

For more SWIFT™ documentation, see the TI

website at www.ti.com/swift.