RT9471/RT9471D

3A Single Cell Switching Battery Charger

The RT9471/D is a highly-integrated 3A switch mode battery charge management and system power path management device for single cell Li-Ion and Li-polymer battery. The low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery life during discharging phase. The I²C serial interface with charging and system settings makes the device a truly flexible solution.

The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 85°C.

Applications

Smart Phone/Tablet PC
Personal Information Appliances
Portable Device and Accessory

Key Spec.
	RT9471	RT9471D
Status	Active	Active
Vin (min) (V)	3.9	3.9
Vin (max) (V)	13.5	13.5
Battery Charge Voltage (max) (V)	4.7	4.7
Battery Charge Current (max) (A)	3.15	3.15
Status Indicator	Yes	No
Charger Type	Switching	Switching
Input Source	AC Adapter;USB	AC Adapter;USB
Features	Adjustable Current Limit;Current Mode Control;Cycle-by-Cycle Current Limit;I2C;OCP;OVP;Power Good;SCP;UVP	Adjustable Current Limit;Current Mode Control;Cycle-by-Cycle Current Limit;I2C;OCP;OVP;SCP;UVP
Package Type	WQFN4x4-24	WQFN4x4-24
Built-in Power MOSFETs	Yes	Yes

Features

High Efficiency, 1.5MHz, Synchronous Switch-Mode Buck Charger
► 92% Charge Efficiency at 2A with 5V Input and 3.8V Battery
► Support 3.9V to 13.5V Input Voltage Range
► Average Input Current Regulation (AICR)
► Minimum Input Voltage Regulation (MIVR)
► Minimum Input Voltage Regulation Track (MIVR Track)
► Charge Current Regulation (CCR)
► Charge Voltage Regulation (CVR)
► Charge Voltage Regulation Track (CVR Track)
► Junction Thermal Regulation (JTR)
Supports USB On-The-Go (OTG)
► 92% Boost Efficiency at 1A with 3.8V Battery and 5.15V Output
► OTG Current Limit Regulation (OCLR)
► OTG Voltage Limit Regulation (OVLR)
Protection
► Over-Temperature Protection (OTP)
► VBUS Over-Voltage Protection (VBUS OVP)
► Battery Over-Voltage Protection (VBAT OVP)
► System Over-Voltage Protection (VSYS OVP)
► System Under-Voltage Protection (VSYS UVP)
► System Over-Load Protection (VSYS OLP)
► Cycle-by-Cycle Over-Current Protection (OCP)
► OTG Low Battery Protection (OTG LBP)

Datasheet
Title	Last Update	Download
3A Single Cell Switching Battery Charger	2019/06/12

Technical Documents
Title	Item Type	Last Update
Richtek Product Selection Guide [Jan., 2024]	Selection Guide	2024/01/18
Richtek Featured Product Tree [Aug., 2023]	Selection Guide	2023/08/07
Power Management for Video Doorbell	App. Note	2021/10/08

Videos
Title	Last Update	Views
Introducing the Versatile Buck-Boost Controller for USB PD Fast Charging Solutions	2023/09/11	176
High accuracy, low quiescent current battery power management solutions for wireless portable applications	2022/09/27	415
How does mobile phone fast charging work?	2020/04/28	1239

Evaluation Boards
Title	Last Update	Download
3A Single Cell Switching Battery Charger Evaluation Board	2023/07/14

Part Number	Package Type	Package Qty.	Free Sample	Buy From Authorized Distributor
RT9471DGQW(2)	WQFN4x4-24	1500	Request	Buy from Distributor

Please confirm with our distributor or sales representative for actual stock status.