Texas Instruments TPS543B25 & TPS543B25T Step-Down Converters

Texas Instruments TPS543B25 and TPS543B25T Synchronous SWIFT™ Step-Down Converters are high-efficiency 18V, 25A buck converters employing an internally compensated and fixed-frequency Advanced Current Mode (ACM) control architecture. These converters operate under FCCM and generate output voltages from 0.5V to 7V. The fixed frequency controller can operate from 500kHz to 2.2MHz and be synchronized to an external clock using the SYNC pin. Additional features include a high-accuracy voltage reference, two-wire remote sense, selectable soft-start times, selectable current limits, and a full suite of fault protections. The TPS543B25 and TPS543B25T converters are used in fiber networks, test and measurement, and healthcare applications.

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 (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

1ms, 2ms, 4ms, and 8ms selectable soft-start times
Monotonic start-up into pre-biased outputs
Selectable current limits to support 25A and 20A 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 × 4.5mm, 17-pin WQFN-HR package with 0.5mm pitch
Lead-free (RoHS compliant)
Pin compatible with the 20A (TPS543B22), 16A (TPS543A26), and 12A (TPS543A22)
WEBENCH and SIMPLIS models are available