1 Features

• Internal 5-A, 40-V low-side MOSFET switch

• 2.9-V to 32-V input voltage range

• ±0.7% reference voltage

• 0.5-mA operating quiescent current

• 2.7-μA shutdown supply current

• Fixed frequency current mode PWM control

• Frequency adjustable from 100 kHz to 1.2 MHz

• Synchronization capability to external clock

• Adjustable soft-start time

• Pulse skipping for higher efficiency at light loads

• Cycle-by-cycle current limit, thermal shutdown,

and UVLO protection

• QFN-16 (3-mm × 3-mm) and HTSSOP-14

packages with PowerPAD™

• Wide –40°C to 150°C operating TJ range

• Create a custom design using the TPS55340 with

the WEBENCH Power Designer

2 Applications

• 3.3-V, 5-V, 12-V, 24-V power conversion

• Boost, SEPIC, and flyback topologies

• Thunderbolt port, USB type-C power delivery,

power docking for tablets, and portable PCs

• Industrial power systems

• ADSL modems

3 Description

The TPS55340 is a monolithic, nonsynchronous,

switching regulator with integrated 5-A, 40-V power

switch. The device can be configured in several

standard switching-regulator topologies, including

boost, SEPIC, and isolated flyback. The device has

a wide input voltage range to support applications with

input voltage from multicell batteries or regulated

3.3-V, 5-V, 12-V, and 24-V power rails.

The TPS55340 regulates the output voltage with

current mode PWM (pulse width modulation) control,

and has an internal oscillator. The switching frequency

of PWM is set by either an external resistor or by

synchronizing to an external clock signal. The user

can program the switching frequency from

100 kHz to 1.2 MHz.

The device features a programmable soft-start

function to limit inrush current during start-up and

has other built-in protection features including cycleby-

cycle overcurrent limit and thermal shutdown.

The TPS55340 is available in a small 3-mm × 3-mm

16-pin QFN as well as 14-pin HTSSOP packages with

PowerPAD for enhanced thermal performance.

The 5-A, 40-V TPS55340 boost converter in the

HTSSOP-14 package is pin-to-pin compatible with the

3-A, 40-V TPS61175, and it extends the maximum

input voltage from 18 V to 32 V.