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Qorvo’s Power Solution for your GaN PA

Qorvo’s Power Solution for your GaN PA

The 40V, ACT41000 RFPoL synchronous step-down regulator delivers low-noise and high efficiency to power one or more GaN or GaAs power amplifiers.

Qorvo’s ACT41000 is a programmable output, low noise, RFPoL (Radio Frequency Point of Load) step down Regulator with auxiliary bias supply regulators. This synchronous step-down voltage regulator supports a wide input voltage from 4.5 to 40 V and integrates both the high side and low side MOSFETS. These 50 mΩ RDSON transistors, driven by the optimized 5V self-biasing, enable high efficiency to reduce power losses.

The product’s main buck converter can be dynamically programed to an output voltage between 3 and 24 V in 12.5 mV steps via the I2C interface or analog feedback. It also can dynamically program output current between 0 and 4 A in 256 steps via the I2C interface in a constant-current (CC) operation mode. The main buck operates in a proprietary current mode control that supports external clock syncing for switching frequencies between 450 kHz and 2.25 MHz and spread-spectrum. ACT41000 has built-in iDAC for Bias Detection and automatic system level bias threshold trigger for PA Vdrain bias applications. The product also integrates a 5 V / 350 mA mini-buck converter and a 20 mA AUX LDO.

Key Features:

  • 4.5 to 40 V operational input voltage
  • Programmable output voltage by I2C from 3 to 24 V in 12.5 mV steps
  • Programmable output current limit from 0 to 4 A in 256 steps
  • Integrated current DAC for bias detection and automatic system level bias threshold trigger
  • Fixed-frequency current mode control from 450 kHz – 2.25 MHz with external clock sync and 100% duty operation
  • 5 V bias, 350 mA buck converter
  • 20 mA AUX LDO programmable output 0.9 to 4.0 V
  • 32-pin 5 mm x 5 mm exposed-pad QFN package
Topology Step-Down
Min Input Voltage(V) 4.5
Max Input Voltage(V) 40
Min Output Voltage(V) 3
Max Output Voltage(V) 24
Max Output Current(A) 4
Iq (typ)(mA) 1.3
Pin Count 32
Operating Junction Temperature(C) -40 to 150
Configurable Output Voltage Step Size(mV) 12.5
Configurable Output Current Step Size(mA) 15.6
Output Noise(mVrms) 1.1
Operation Frequency(kHz) 445 to 2,250
Features Mini-buck: 350mA; LDO: 20mA; External Clock Sync; Spread-Spectrum; I2C;
Package Type QFN, 32-pin
Package(mm) 5.0 x 5.0

See the ACT41000 in action in Qorvo’s power bias solution reference design for GaAs and GaN power amplifiers, and read more about this solution in our blog.

Contact us for more information.


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