1 Features

• Fixed-frequency, internally compensated advanced

current mode (ACM) control

• Integrated 6.5-mΩ and 2-mΩ MOSFETs, Inductor

and basic passives

• 4-V to 18-V input voltage range

• 0.5-V to 7-V output voltage range

• True differential remote sense amplifier (RSA)

• Three selectable PWM ramp options to optimize

the control loop performance

• Five selectable switching frequencies: 500 kHz,

750 kHz, 1 MHz, 1.5 MHz, and 2.2 MHz

• Synchronizable to an external clock

• 0.5 V, ±0.5 voltage reference accuracy over full

temperature range

• 1-ms, 2-ms, 4-ms, and 8-ms selectable soft-start

times

• Monotonic start-up into prebiased outputs

• Selectable current limits to support 20-A and 16-A

operation

• Enable with adjustable input undervoltage lockout

• Power-good output monitor

• Output overvoltage, output undervoltage, input

undervoltage, overcurrent, and overtemperature

protection

• –40°C to 125°C operating junction temperature

• 6.5-mm × 7.5-mm × 4.0-mm, 25-pin over-molded

QFN package

• Lead-free (RoHS compliant)

• Pin compatible with the 16 A - TPSM843A26 and

12 A - TPSM843A22

2 Applications

• Wireless and wired communications infrastructure

equipment

• Optical and fiber networks

• Test and measurement

• Medical and healthcare

3 Description

The TPSM843B22 is a high-efficiency 18-V, 20-A

synchronous buck module employing an internally

compensated, fixed-frequency advanced current

mode (ACM) control architecture, which while always

operating under FCCM, generates output voltages

from 0.5 V to 7 V. The module is capable of

providing high efficiency while operating at a switching

frequency up to 2.2 MHz. The module is in a 6.5-mm

x 7.5-mm x 4-mm over-molded package, which makes

it optimal for designs requiring a small solution size.

Additional features include a high accuracy voltage

reference, selectable soft-start times, monotonic startup

into prebiased outputs, selectable current limits,

adjustable UVLO through the EN pin, and a full suite

of fault protections.