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5A Single Cell Li-Ion Switching Battery Charger with Direct Charge, Power Path Management and USB OTG Boost Mode

RT9468

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The RT9468 is a switch-mode single cell Li-Ion/Li-Polymer battery charger for portable applications. It integrates a synchronous PWM controller, power MOSFETs, input current sensing and regulation, high-accuracy voltage regulation, and charge termination. The charge current is regulated through integrated sensing resistors. The RT9468 also features USB On-The-Go (OTG) support. The RT9468 integrates an easy-to-use direct charge function, simply driving an external MOSFET to enable a direct charge path, as well as over-voltage protection, over-current protection, and watchdog functions.

The RT9468 optimizes for charging task by using a control algorithm to vary the charge rate for different modes, including pre-charge mode, fast charge mode (constant voltage and constant current). The key charge parameters are programmable through an I2C interface. The RT9468 will resume the charge cycle whenever the battery voltage falls below an internal recharge threshold, and can automatically enter sleep mode if the input power supply is removed.

Other features include under-voltage protection, over- voltage protection, thermal regulation and reverse leakage protection.

The RT9468 is available in a WQFN-32L 4x4 package.

Applications

  • Cellular Telephones
  • Personal Information Appliances
  • Tablet PC, Power Bank
  • Portable Instruments
  • Internet of Things
Key Spec.
RT9468
Status Active
Vin (min) (V) 4
Vin (max) (V) 14
Battery Charge Voltage (max) (V) 4.71
Battery Charge Current (max) (A) 5
Status Indicator No
Charger Type Switching
Input Source AC Adapter;USB
Features Adjustable Current Limit;Cycle-by-Cycle Current Limit;OCP;OVP;UVP
Package Type WQFN4x4-32
Built-in Power MOSFETs No
Features
  • Direct Charge with Over-Voltage Protection, Over- Current Protection and Watchdog
  • High Efficiency 5A, 1.5MHz Switching Charger with Output Inductor DFE252012F, TOKO
    ► Charging Efficiency 90.25% at ICHG = 2A
    ► Charging Efficiency 88.86% at ICHG = 3A
    ► Charging Efficiency 84.2% at ICHG = 5A
  • Synchronous 1.5MHz/0.75MHz Fixed-Frequency PWM Controller with Up to 95% Duty Cycle
  • Power Path Management by BATFET Control
  • Support High Voltage Input (9V/12V)
  • Support High Voltage Input Adapter (Pump Express 1.0/2.0/3.0)
  • Support IR Compensation Function from Charger Output to Cell Terminal
  • Optimize Input Sourcing Capability to Prevent Overload
    ► AICR Current Limit Setting via I2C
    ► ILIM Pin for Current Limit Setting
    ► Average Input Current Limit Measurement
  • Shipping Mode for Battery Leakage Reduction
    ► Wake Up System, Exit Shipping Mode, and Reset System by QON Pin
  • Automatic Charging
  • Average Input Current Regulation (AICR) :
    0.1A to 3.25A in 50mA Steps
  • Charge Current Regulation Accuracy : ±7%
  • Charge Voltage Regulation Accuracy : ±1% (0 to 85°C)
  • Protection for Overall System Considerations
    ► Thermal Regulation for Current Reduction and Over-Temperature Protection
    ► Input Over-Voltage Protection
    ► Input Bad Adapter Protection
    ► Battery Over-Voltage Protection
  • Support ADC Conversion for
    ► VBUS, VBAT, VSYS, REGN, TS_BAT, IBUS, IBAT, TEMP_JC, TS_BUS,VBATS, IBATS
  • INT Output for Communication with Host Through I2C (Watch Dog / Polling Function)
Datasheet
TitleLast UpdateShareDownload
5A Single Cell Li-Ion Switching Battery Charger with Direct Charge, Power Path Management and USB OTG Boost Mode2017/05/23
Technical Documents
TitleLast UpdateShareDownload
Introduction to Richtek USB Type-C Power Delivery Solutions2018/12/18
Power IC Solutions for IoT/Portable/Wearable/Battery-Powered Applications2018/11/15
Evaluation Boards
TitleLast UpdateShareDownload
5A Single Cell Li-Ion Switching Battery Charger With Direct Charge, Power Path Management and USB OTG Boost Mode2018/11/01
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9468GQWWQFN4x4-321500 Not available Buy from Distributor
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