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
• 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.