General Description

The RT7208EB is a programmable USB PD controller with built-in functions of synchronous rectification, bi- direction control and internal feedback compensation. The controller MCU handles various proprietary protocols via the D+/D- interface and supports USB PD Type-C via the CC1/CC2 pins.

The RT7208EB provides the highly integrated solution for the off-line high power density AC-DC converter by utilizing the zero-voltage switching (ZVS) on main switch. This is accomplished by built-in compensation for feedback control to regulate output voltage and current. In order to reduce usage of external components, the controller is built-in with a synchronous rectification controller, and integrated with diverse functions and protections. These features improve the efficiency as well as the safety of a power converter.

In the IC, an internal synchronous rectifier controller can optimize efficiency and provide safe operation in both continuous-conduction mode (CCM) and discontinuous

conduction mode (DCM) under a wide output voltagerange of 3.0V to 22V.

Moreover, a dual operational amplifier with the digital- to-analog converter (DAC) is embedded for voltage- loop and current-loop regulation when programming the constant-voltage (CV) and constant-current (CC) regulation in high precision.

Applications

USB PD Type-C or Proprietary Protocols (e.g., FCP,SCP and AFC) Chargers/Adapters for SmartPhones, NBs, Tablets and All Other Electronics

USB PD Extension Cores with Offline AC-DCConverters

Features

Protocol Support

USB PD2.0/PD3.0 and PPS

Proprietary Protocols

Highly Integrated

Embedded MCU with an Mask ROM of 32KB, anOTP-ROM of 16KB, and an SRAM of 3KB

Built-in Synchronous Rectifier Controller andDriver

Built-in Charge Pump for a Wide VDDOperation Range of 3V to 22V

Built-in Bi-direction Function forProgrammable Constant-Voltage andConstant-Current Control

Built-in Internal Feedback Compensation

Built-in Dual Shunt Regulators withRespectively 11-bit and 10-bit DACProgrammable Reference Voltages for CV andCC Control

Built-in 10-bit Analog-to-Digital Converter(ADC)

Programmable Linear Cable Compensation

BLD Pin for Quick Discharge of OutputCapacitor

VBUS Pin for Detection VBUS Voltage andQuick Discharge of VBUS Capacitor

USBP Pin for Direct Drive of External BlockingN-MOSFET

Power-Saving Mode in Standby Mode

Protection

Adaptive Output Over-Voltage Protection

Adaptive Under-Voltage Protection

CC1/CC2/D+/D- Over-Voltage Protection

Firmware-Programmable Constant-CurrentProtection

Firmware-Programmable Over-CurrentProtection

Firmware-Programmable Over-TemperatureProtection