The TPS543320 is a high-efficiency 18-V, 3-A synchronous buck converter employing an internally-compensated, fixed-frequency Advanced Current Mode control. It is capable of providing high efficiency while running at a switching frequency up to 2.2 MHz. The device is in a small 2.5-mm × 3-mm HotRod™ VQFN package, which coupled with high efficiency at high frequency, makes it optimal for designs requiring a small solution size. The fixed frequency controller can operate from 500 kHz to 2.2 MHz and can be synchronized to an external clock using the SYNC pin. Additional features include a high accuracy voltage reference, selectable soft start times, montonic start-up into pre-biased outputs, selectable current limits, adjustable UVLO through the EN pin, and a full suite of fault protections.

Features：

Fixed-frequency, internally-compensated advanced current mode (ACM) control

Integrated 25-mΩ and 13.9-mΩ MOSFETs

Input voltage range: 4 V to 18 V

Output voltage range: 0.5 V to 7 V

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

Selectable soft start times: 0.5 ms, 1 ms, 2 ms, and 4 ms

Monotonic start-up into pre-biased outputs

Selectable current limits to support 3-A and 2-A operation

Enable with adjustable input undervoltage lockout

Power good output monitor

Output overvoltage, output undervoltage, input undervoltage, overcurrent, and overtemperature protection

Pin-to-pin compatible with TPS543820 and TPS543620

–40°C to 150°C operating junction temperature

2.5-mm × 3-mm, 14-pin VQFN-HR package with 0.5-mm pitch