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ACT43750 Datasheet(PDF) 1 Page - Qorvo, Inc |
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ACT43750 Datasheet(HTML) 1 Page - Qorvo, Inc |
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1 / 43 page  ACT43750 RF POL Drain-Switch Driver / Gate-bias Regulator Data Sheet Rev. F, February 10, 2025 | Subject to change without notice 1 of 43 www.qorvo.com © 2024 Qorvo US, Inc. All rights reserved. ® BENEFITS and FEATURES • Wide Operating Range • Vin = 10V to 55V • Vgate = -6V to -1.5V • RF PA Biasing Solution • Turn on and off sequencing • Negative gate voltage supply • Supports GaN and Silicon FETs • High-speed drain switching • Autonomous Bias Point Calibration • Autonomous IDQ(DRAIN) calibration • Resistor Setpoint Range: 10mA to 2A • Digitally adjustable ±31% of setpoint in 1% steps • Space and Cost savings • Fully integrated gate drive voltage • High switching frequency: 2.05 MHz • Integrated FETs and small chip inductor • 37-pin, 5 mm x 5 mm, 0.4-mm pitch QFN package • High-Performance Negative Gate Drive Supply • REGG input voltage: +12V (TYP) • REGG output voltage: -6V to -1.5V by 732µV step • REGG output source current: 300mA • REGG output sink current: -100mA • REGG output noise: <200µVRMS • Protection • UVLO, OVLO, OVP, UVP, OCP, TSD APPLICATIONS • Military Radar System • Civilian Radar System • RF GaN / GaAs PA Power Supply GENERAL DESCRIPTION The ACT43750, part of Qorvo’s RF POL regulator family, is the last stage of a three-chip radar power supply so- lution. This three-stage solution, developed with the ACT43950, ACT43850, and ACT43750, forms a com- pact, complete power supply system for radio frequency (RF) power amplifiers (PAs) that demand fast transient, high current pulse loads. The first stage, ACT43950 converts a high voltage dc input voltage into a regulated dc constant-current (CC) to charge bulk capacitor. The second stage, ACT43850, regulates the capacitor volt- age into a tightly regulated DC voltage to power the drain for GaN RF power amplifiers. The third stage, ACT43750, provides several functions specifically designed to optimize GaN performance. It operates either standalone or as the third stage in a multiple stage power solution. It provides the RF PA negative gate voltage using an ultra-low noise inverting buck dc-to-dc regulator with integrated FETs and pro- grammable voltage reference. It provides the required GaN power up and power down sequencing between the drain and gate voltages. All GaN RF PAs require calibrating the gate voltage to set the desired operating point. The ACT43750 automatically calibrates and stores the optimal gate voltage. This operating point changes with time and temperature. The IC can recal- culate and adjust the optimal gate voltage in the field without waiting for a maintenance cycle. The ACT43750 also enables drain switching in pulsed radar applica- tions. The ACT43750 is available in a 37-pin, 5 mm x 5 mm, 0.4 mm pitch QFN package. |
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