Act4529 40 V 3 A Step-down Converter With Qc 2.0 Usb Auto-detect And Usb-pd - Application: Rf Transmitting

Qorvo's ACT4529 is a wide input voltage, high efficiency step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode.

ACT4529 has built-in QC2.0 decoding to provide 5.1 / 9.1 / 12.1 V outputs as requested by attached portable devices. It also supports Apple, Samsung and BC1.2 devices to charge at full current rate. The product has an interface for USB-PD control via a tri-state digital pin. Vout is 5.1 V if this pin is floating, Vout is 9.1 V when this pin's voltage is less than 0.8 V and Vout is 12.1 V when this pin's voltage is more than 2.0 V.

The product has accurate output current limits under constant current regulation to meet MFi specification. It provides up to 3.0 A output current at 125 kHz switching frequency. ACT4529 utilizes an adaptive drive technique to achieve good EMI performance while maintaining greater than 90% efficiency at full load for mini-size CLA designs. ACT4529 also has output short circuit protection with hiccup mode. The average output current is reduced to below 6 mA when output is shorted to ground. Other features include output over-voltage protection and thermal shutdown.

ACT4529 is available in a SOP-8EP package and requires very few external components for operation.