RT7885
All-in-One USB PD and Bidirectional PWM Buck-Boost Controller
General Description
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 Cortex
TM
-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.
Features
Communication Protocols
Support Type-C and USB Power Delivery (PD)
Communication
Support Dual-Role Power (DRP) Application
Support Proprietary Protocols via DP and DM
Interfaces
Charging Operation for 2S to 4S Battery
CC and CV Charge, End of Charge, Re-Charge,
and Charging Timeout Protection
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 I
2
C Interface, LED Drivers, GPIOs
Built-in Bleeders for Quick VBUS Discharge
Online Firmware Update via CC1/2 or Slave I
2
C
Interfaces
WQFN-60L 7x7 Package
USB PD PD3.0/PPS Certification Passed
(TID 2319)
Cell
Applications
USB PD Type-C Power Bank
Ordering Information
RT7885
-
Programmed Firmware Code AABBX
AA : Application Code
BB : Model Code
X : Customer Approved Version Code
Package Type
QW : WQFN-60L 7x7 (W-Type)
Lead Plating System
G : Green
(Halogen Free and Pb Free)
RT7885 Version
(Refer to Version Table)
Note :
The products are :
RoHS compliant and compatible with the current
requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Copyright © 2020 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7885-02
January 2020
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
