RT9460 Datasheet, PDF (1/33 Pages) Richtek Technology Corporation – Switch-Mode Single Cell Li-Ion Charger

®
RT9460
Switch-Mode Single Cell Li-Ion Charger with USB-OTG
General Description
The RT9460 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, and high accuracy voltage
regulation and charge termination circuits. Besides, the
charging current is regulated through the integrated
sensing resistors. The RT9460 also features USB On-
The-Go (OTG) support.
The RT9460 optimizes the charging task by using a control
algorithm to vary the charge rate via different modes,
including pre-charge mode, fast charge mode, and constant
voltage mode. The key charge parameters are
programmable via the I²C interface. The RT9460 resumes
the charge cycle whenever the battery voltage falls below
an internal recharge threshold, and automatically enters
sleep mode when the input power supply is removed.
Other features include under-voltage protection, over-
voltage protection, thermal regulation and reverse leakage
protection.
The RT9460 is available in the small WL-CSP-25B
2.52x2.52 packages.
Applications
 Cellular Telephones
 Personal Information Appliances
 Tablet PC, Power Bank
 Portable Instruments
Features
 High Accuracy Voltage/Current Regulation
 Average Input Current Regulation (AICR) : 0.1/0.15/
0.5/ to 3A per 0.1A
 Minimum Input Voltage Regulation
 For 5V Adaptor : 4V/4.25V/4.5V/4.75V
 For 9V Adaptor : 7V/7.5V/8V/8.5V
 Charge Current Regulation Accuracy : ±5%
 Charge Voltage Regulation Accuracy : ±1% (0 to
85°C)
 Integrated Power MOSFETS for up to 3.125A Charge
Rate
 Support USB Charging Detection
 Battery Temperature Sensing
 Synchronous 0.75/1.5MHz Fixed Frequency PWM
Controller with Up to 95% Duty Cycle
 Reverse Leakage Protection to Prevent Battery
Drainage
 Thermal Regulation and Protection
 Over Temperature Protection
 Input Over Voltage Protection
 IRQ Output for Communication with I²C
 Automatic Charging
 RoHS Compliant and Halogen Free
Simplified Application Circuit
To Adaptor/USB
C_IN
RT9460 _MID
VIN
LX
SYS
DP
PPCTRL
DM
SCL
BAT
SDA
PGND
VPTS
TS
L
C_MID
C_SYS
To System
External Path
(Option)
C_BAT
R_PULL
+
R_NTC
Battery
Pack
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
DS9460-04 August 2017
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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