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Qorvo ACT4752 Step-Down DC/DC Converter

Qorvo ACT4752 Step-Down DC/DC Converters are programmable with bias supply rails for microcontrollers or USB PD controllers. Qorvo ACT4752 Converters support a wide input voltage range from 4.5V to 40V and utilize a synchronous step-down (buck) voltage regulator architecture. ACT4752 integrates both high- and low-side MOSFETs while supporting smaller multi-layer ceramic capacitor (MLCC) devices.

The main buck converter can be dynamically programmed to an output voltage between 3 and 24V in 12.5mV steps via the I2C interface or analog feedback. Additionally, the device can dynamically program output current between 0 and 4A 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 450kHz and 2.25MHz.

The ACT4752 is available in a 32-pin 5mm x 5mm QFN package, with a power-optimized footprint and exposed pad for improved thermal performance.

Features

  • USB-certified charger design available
  • Supports small ceramic output capacitors
  • 50mΩ integrated high-/low-side FETs
  • 5V at 350mA Integrated mini-buck bias supply
  • 3V to 24V in 12.5mV Steps I2C programmable output voltage
  • 0A to 4A with 256 step resolution I2C programmable output current limit
  • External clock synchronization and 100% duty cycle operation
  • Out of AM radio / spread-spectrum operation
  • 0.9V to 4.0V at 20mA Auxiliary LDO
  • I2C interface, fast-mode plus (Fm+, 1MHz) with configurable address
  • QFN, 32-pin 5mm x 5mm package

Applications

  • USB PD 3.0 charging hubs
  • Power management for USB-C power rails
  • Industrial switch-mode power supplies (SMPS) for 24V bus
  • High-power LED lighting

Specifications

  • Step-down topology
  • 4.5V to 40V Input voltage range
  • 4.0A max output current
  • 450kHz to 2.25MHz fixed-frequency current-mode control
Publicado: 2020-09-25 | Actualizado: 2024-08-29