ACT43850

20 to 55 V / 20 A Output, Compact, Fast Response, Step Down RFPoL (Point of Load) Voltage Regulator

The ACT43850, a part of Qorvo's RFPoL (RF Point of Load) regulator family, is a stage device of a pulse load power supply solution for radar-type systems. Together with the companion device ACT43750, 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 solution makes an RF transmitter (TX) module significantly smaller in size/volume, cost, component count and development cycle.
 
The ACT43850 regulates dc output constant voltage (CV) for the drain power of PAs. The 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.
Last Time Buy
i
End of Life announced April 8, 2026 (PCN 26-0036).
Last Time Buy: October 7, 2026
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Key Features

  • Input Voltage Range: Up to 150 V
  • Output Voltage Range: 20 V to 55 V
  • Gate Driver Support: Power-GaN or Traditional FETs
  • Fixed Frequency Current-Mode Operation:
    • Low Noise: 2.4 mVRMS @ 50 V (100 Hz to 100 kHz)
    • Stable Loop, Phase-margin: ~ 60°
    • Fast Response, Loop BW: ~ 100 kHz
    • 500 kHz to 900 kHz, Programmable
  • Protections: UVLO, OVLO, OVP, UVP, OCP, TS
  • 4 mm x 4 mm, 0.4-mm pitch, 25-pin QFN
  • Ready-to-Use Reference Circuit Design Available

Typical Applications

  • RF GaN / GaAs PA Power Supply
  • Military Radar System
  • Civilian Radar System
  • Laser Drivers
  • Light Beacons

Parameters

Topology
Step-Down
Min Input Voltage (V)
45
Max Input Voltage (V)
150
Min Output Voltage (V)
20
Max Output Voltage (V)
55
Max Output Current (A)
20
Iq (typ) (mA)
N/A
Pin Count
25
Operating Junction Temperature (C)
-40 to 150
Configurable Output Voltage Step Size (mV)
1,000
Configurable Output Current Step Size (mA)
120
Output Noise (mVrms)
2.4
Operation Frequency (kHz)
500 to 900
Features
External Clock Syncing with Selectable Clock Edge
Package Type
QFN, 25-pin
Package Size (mm)
4.0 x 4.0
RoHS
Yes
Lead Free
Yes
Halogen Free
Yes
ITAR Restricted
No
ECCN
EAR99

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