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Texas Instruments TPS543B22 Synchronous Buck Converter

Texas Instruments TPS543B22 Synchronous Buck Converter is a high-efficiency 18V, 20A converter used in an internally compensated, fixed-frequency Advanced Current Mode (ACM) control architecture. This fixed-frequency converter can operate from 500kHz to 2.2MHz frequency range and can be synchronized to an external clock using the SYNC pin. The TPS543B22 converter features a high-accuracy voltage reference, two-wire remote sense, selectable soft-start times, and monotonic startup into pre-biased outputs. Additional features include selectable current limits, adjustable UVLO through the EN pin, and a full suite of fault protections. This converter is packaged in a small 2.5mm x 4.5mm HotRod™ WQFN-FCRLF package. The TPS543B22 converter is used in wireless and wired communications infrastructure equipment, optical and fiber networks, test and measurement, medical, and healthcare.

Features

Fixed-frequency internally compensated Advanced Current Mode (ACM) control
Integrated 6.5mΩ and 2mΩ MOSFETs
4V to 18V input voltage range
0.5V to 7V output voltage range
True differential Remote Sense Amplifier (RSA)
Three selectable PWM ramp options to optimize the control loop performance
Five selectable switching frequencies are 500kHz, 750kHz, 1MHz, 1.5MHz, and 2.2MHz
Synchronizable to an external clock
0.5V, ±0.5% voltage reference accuracy over the full temperature range
Selectable soft-start times are 1ms, 2ms, 4ms, and 8ms
Monotonic start-up into pre-biased outputs
Selectable current limits to support 20A and 16A operation

Enable with adjustable input undervoltage lockout
Power-good output monitor
Output overvoltage, output undervoltage, input undervoltage, overcurrent, and overtemperature protection
-40°C to 150°C operating junction temperature
2.5mm x 4.5mm, 17pin WQFN-HR package with 0.5mm pitch
Lead-free (RoHS compliant)
Pin compatible with the TPS543A26 and TPS543A22 converters
PSpice and SIMPLIS models are available

Applications

Wireless and wired communications infrastructure equipment
Optical and fiber networks

Test and measurement
Medical and healthcare

Texas Instruments TPS543B22 Synchronous Buck Converter

Features

Applications

Block Diagram

Application Circuit Diagram

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