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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