Three chips for a complete USB-C PD fast charger

Three chips for a complete USB-C PD fast charger
New Products |
Diodes has launched a three-chip design for high-power-density USB Type-C power delivery (PD) systems.
By Nick Flaherty


The AP43771V USB Type-C PD decoder from Diodes is compatible with PD3.0, PPS Rev 3.0, V1.2 (TID – 4305), and Qualcomm Quick Charge QC4/QC4+/QC5 (QC20201127203) protocols. It supports a 3.3V to 24V operating voltage range and incorporates both a one-time programmable (OTP) ROM for all the main firmware, and a multi-time programmable (MTP) ROM to accommodate user configuration data.

With I2C and GPIO pins and built-in application firmware, the AP43771V backs various intelligent power management systems during charging states. These include smart power sharing among multiple charging ports, thermal power de-rating, LED light indication, and fault indication. With a 3.3A current, the chip support chargers up to 75W.

The AP3306 is an active clamp flyback (ACF) controller that uses zero voltage switching (ZVS) and magnetic energy recycling. It can be used with an integrated driver GaN FET, a Cascode GaN FET, or a MOSFET serving as the main low-side switch. With integrated high-side ACF gate driver control, the AP3306 supports leakage energy recycling circuitry via a reduced-current-capability high-side MOS switch.

The APR340 is a secondary-side synchronous rectification (SR) MOSFET driver optimized for use with the AP3306. It features a built-in pulse linear regulator and operates in constant current (CC) mode to safeguard the charging system. The system output voltage can go down to 2V for programmable power supply (PPS) applications.

The AP43771V is available in both W-DFN3030-14 and W-QFN4040-24 package options. The AP3306 is supplied in a SO-10 package format, while the APR340 comes in a SOT26 package. These devices are respectively priced at $0.49 (AP43771V, W-DFN3030-14), $0.52 (AP43771V, W-QFN4040-24), $0.41 (AP3306), and $0.14 (APR340) each in 1000 piece quantities.

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