RT9481 Datasheet, PDF (1/41 Pages) Richtek Technology Corporation – Easy to Use Power Bank Solution

RT9481
Easy to Use Power Bank Solution (EZPBS^TM) Integrated Chip
with Switch Charger, ADC, and Load switch
General Description
The RT9481 is a high integration and easy to use
power solution for Li-ion power bank and other
powered handheld applications. We call it EZPBS^TM
(Easy to Use Power Bank Solution). This single chip
includes a Switching Charger with Boost function,
Analog to Digital Converter (ADC), USBOUT Load
Switch, Adapter Detection with BC1.2, DCP controller
and LDO.
Applications
 Power Bank
Ordering Information
RT9481
Package Type
QW : WQFN-24L 4x4 (W-Type)
(Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek 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.
Pin Configurations
(TOP VIEW)
USBOUT
USBOUT
VHMID
VBUS
VBUS
D-
24 23 22 21 20 19
1
18
2
17
3
16
AGND
4
15
5
25
14
6
13
7 8 9 10 11 12
SCL
SDA
INT
AGND
VDDA
VDD28V
WQFN-24L 4x4
Features
System
 High Accuracy Voltage/Current Regulation
 1% Charge Voltage Regulation
 0.1A Charge Current Regulation
 3% Boost Output Voltage Regulation
 Thermal Shutdown Protection
 Reverse Leakage Protection to Prevent Battery
Drainage.
 Built-In USBOUT DCP Controller
 Built-In USBOUT Attach/Detach Detection
 Built-In USBOUT Light Load Detection
 Built-In Load Switch with Current Regulation
Thermal Regulation and Output Short Current
Protection
 Built-In Adapter Detection with BC1.2
 Built-In Accurate ADC to Measure VBAT, VBUS,
TS, IBAT , USBOUT and IUSBOUT
 Built-In LDO
 Interrupt Output for Event Notification
 I²C Interface with 400kHz
Charge Mode
 Charge Voltage Regulation : 3.65V to 4.6V
 Charge Current Regulation : 0.7A to 2.7A
 Minimum Input Voltage Regulation (MIVR) :
4.2V to 4.8V
 Average Input Current Regulation (AICR) : 0.1A
to 2A
 Charge Termination Current : 0.15A to 0.6A
 Pre-charge Threshold : 2.3V to 3.8V
 Pre-charge Current : 0.2A to 0.5A
 Thermal Regulation
 VMID Under Voltage Protection
 VBUS Over Voltage Protection
 Battery Over Voltage Protection
 Bad Adapter Detection
Boost Mode
 Boost Output Current Up to 3A
 Boost Output Voltage : 3.65V to 5.2V
 Battery Under Voltage Protection : 2.5V to 3.2V
 VMID Over Voltage Protection
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS9481-00 June 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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