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.