ACT43850
20 to 55 V / 20 A Output, Compact, Fast Response, Step Down RFPoL (Point of Load) Voltage Regulator
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 × 4 mm, 0.4-mm pitch, 25-pin QFN
- Ready-to-Use Reference Circuit Design Available
The ACT43850, a part of Qorvo’s 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 devices ACT43950 and 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 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.
Typical Applications
- RF GaN / GaAs PA Power Supply
- Military Radar System
- Civilian Radar System
- Laser Drivers
- Light Beacons
Product Categories
| 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 |
| Pin Count | 25 |
| 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(mm) | 4.0 x 4.0 |
| RoHS | Yes |
| Lead Free | Yes |
| Halogen Free | Yes |
| ITAR Restricted | No |
| ECCN | EAR99 |