RT9468 Datasheet, PDF (1/57 Pages) Richtek Technology Corporation – Single Cell Li-Ion Switching Battery Charger

®
RT9468
5A Single Cell Li-Ion Switching Battery Charger with Direct
Charge, Power Path Management and USB OTG Boost Mode
General Description
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
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
DS9468-00 May 2017
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)
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1