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All-in-One USB PD and Bidirectional PWM Buck-Boost Controller

RT7885

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The RT7885 is a USB Power Delivery (USB PD) controller adopting Buck-Boost PWM control scheme and highly integrating functions specially for USB power bank applications, with that this controller is designed to operate in peak current mode with programmable current limit and switching frequency.

The RT7885 embeds an ARM CortexTM-M0 MCU so as to facilitate various functions of communication protocol, protections and customized requirements. Moreover, this RT7885 has built-in charge pumps for driving low-cost NMOS to control the power path. Therefore this IC provides the best USB PD solution for a power bank application with the lowest count of external components.

Applications

  • USB PD Type-C Power Bank
Key Spec.
RT7885A
Status Active
Policy Manager Integrated
Alternate Mode No
PD Version PD3.0
MCU Integrated Yes
Power Role DRP
Data Role Dual Role
External Power Path Control N-MOSFET Driver
Internal Power Path
Iq (Typ) (μA) 100
Realtime VBUS Monitoring Yes
Dead Battery Support Yes
PWM Controller Buck Boost
Max Output Voltage (V) 20
Syn. Rectifier No
CC Pins 2
VBUS Discharge By BLD
Features Adjustable Current Limit;Adjustable Frequency;Adjustable Soft-Start;Constant-Current Regulation;Current Mode Control;Cycle-by-Cycle Current Limit;Diode Emulation Mode;OVP;UVP;VBUS OVP
Package Type WQFN7x7-60
Features
  • Communication Protocols
    ► Support Type-C and USB Power Delivery (PD) Communication
    ► Support Dual Role Port (DRP) Application
    ► Support Proprietary Protocols via DP and DM Interfaces
  • Charging Operation for 1S to 4S Battery
    ► CC and CV Charge, End of Charge, Re-Charge, and Charging Timeout Protection
    ► Cell Balance Control
  • Bi-directional Buck-or-Boost Operation :
    ► Peak-Current Mode PWM Operation
    ► Programmable PWM Switching Frequency
    ► Programmable Constant Voltage and Constant Current Settings for Charger/Provider Mode Output
    ► Pulse-Skipping Mode (PSM) for Light-Load Efficiency
    ► Programmable Cable Voltage Drop Compensation
  • 2 Charge Pump Gate Drivers for N-MOSFETs
  • Hardware and Firmware-Based Protections :
    ► Adjustable Converter Input Current-Limit
    ► Programmable Over-Voltage Protections (OVP) and Under-Voltage Protections (UVP)
    ► Adjustable External OTP
  • Master/Slave I2C Interface, LED Drivers, GPIOs
  • Built-in Bleeders for Quick VBUS Discharge
  • Online Firmware Update via CC1/2 or Slave I2C Interfaces
  • WQFN-60L 7x7 Package
Datasheet
TitleLast UpdateShareDownload
All-in-One USB PD and Bidirectional PWM Buck-Boost Controller2019/05/16
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