Qorvo ACT41000 Low Noise DC-to-DC Buck Converter

Qorvo ACT41000 Low Noise DC-to-DC Buck Converter features a programmable output and auxiliary bias supply regulators. This synchronous step-down voltage regulator supports a wide input voltage of 4.5V to 40V and integrates the high and low side MOSFETs of 50mΩ RDSON for high-efficiency power conversions. To power up a drain of GaN/GaAs Power Amplifiers (PAs), the ACT41000 supports a programmable output both in voltage and current (limit) setpoints, and the device operates in constant-current (CC) and constant-voltage (CV) seamlessly. Qorvo factory programs the default settings, and an optional MCU can re-program them on-the-fly via I2C. The precise 256-step current limit enables an MCU to detect precise IDQ by eliminating a current sensor IC.

The Qorvo proprietary current-mode control uses its on-chip oscillator clock with a spread-spectrum or an external clock to synchronize. This fixed frequency operation with the stable control loop reduces output power noise and EMI to noise-sensitive RF components. The ACT41000 provides two auxiliary rails for peripheral devices like controllers, sensors, etc. The ACT41000 is available in a 32-pin, 5mm × 5mm, thermally enhanced QFN package.

FEATURES

  • 4.5V to 40V operational input voltage
  • Programmable output with factory defaults
    • Output voltage of 3V to 24V in 12.5mV step
    • Output current (limit) of up to 4A in 15.6mA step
  • 450kHz to 2.25MHz fixed-frequency current-mode, with external clock sync. and spread-spectrum
  • 5V/350mA self-bias buck converter with 20mA AUX LDO, programmable output voltage
  • I2C interface, Fast-mode Plus (Fm+, 1MHz)
  •  Protections
    • UVLO, OVP, UVP (Hiccup/Latch-off), OCP, TSD
  • Thermally enhanced 5mm × 5mm QFN package

APPLICATIONS

  • RF PA (GaN/GaAs) drain bias/power with IDQ search
  • General telecom and industrial power supplies
  • Telecom RF modules
  • Radar systems
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