Act43850 20 To 55 V / 20 A Output Step Down Rfpol Point Of Load Voltage Regulator - Ambient Temperature: 3 Rankine

The ACT43850, a part of Qorvos RFPoL (RF Point of Load) regulator family, is the second stage device of a three-chip pulse load power supply solution for radar-type systems. Together with companion devicesACT43950andACT43750, the device forms a compact, complete power supply solution for GaN / GaAs RF power amplifier (PA) devices, demanding fast transient, high current pulse load. This 3-chipset makes an RF transmitter (TX) module significantly smaller in, size/volume, cost, component count and development cycle.

The 1st stage ACT43950 converts a source dc voltage into a regulated dc constant-current (CC) charging bulk capacitor(s) at its output. From the bulk capacitor(s), this ACT43850 regulates dc output constant voltage (CV) for the drain power of PAs. The 3rd stage ACT43750 controls the PAs' drain switching and gate bias.

The ACT43850 is a step-down (buck) dc-dc controller, with external power FET devices. This fast response, fixed frequency, current-mode converter offers stable regulation for low EMI and noise. The output voltage level can be programmed using analog and/or I2C interfaces for the initialization default setpoint and on-the-fly dynamic target.

The ACT43850 is available in a 25-pin, 4 mm x 4 mm, 0.4-mm pitch QFN package, based on a standard pinout 32-pin QFN, several pins removed to maintain creepage distance(s) for high voltage nodes.