1 Features
• Two, 30-mΩ (typical) MOSFETs for high-efficiency
at 2-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 TPS54218 with
the WEBENCH® Power Designer

2 Applications
• Factory automation
• Broadband fixed line access
• Wireless infrastructure

3 Description
TheTPS54218 device is a full-featured, 6-V, 2-A,
synchronous, step-down current-mode converter with
two integrated MOSFETs.
The TPS54218 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 × 3-mm, thermallyenhanced
QFN package.
The TPS54218 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.