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SLUS618F – AUGUST 2004 – REVISED NOVEMBER 2006
SINGLE-CHIP CHARGE AND SYSTEM POWER-PATH MANAGEMENT IC (bqTINY™)
FEATURES
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Small 3,5 mm × 4,5 mm QFN Package
Designed for Single-Cell Li-Ion- or
Li-Polymer-Based Portable Applications
Integrated Dynamic Power-Path Management
(DPPM) Feature Allowing the AC Adapter or
the USB Port to Simultaneously Power the
System and Charge the Battery
Power Supplement Mode Allows Battery to
Supplement the USB or AC Input Current
Autonomous Power Source Selection (AC
Adapter or USB)
Integrated USB Charge Control With
Selectable 100-mA and 500-mA Maximum
Input Current Regulation Limits
Dynamic Total Current Management
for USB
Supports Up to 2-A Total Current
3.3-V Integrated LDO Output
Thermal Regulation for Charge Control
Charge Status Outputs for LED or System
Interface Indicates Charge and Fault
Conditions
Reverse Current, Short-Circuit, and Thermal
Protection
Power Good (AC Adapter and USB Port
Present) Status Outputs
Charge Voltage Options: 4.1V, 4.2V, or 4.36V
APPLICATIONS
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Smart Phones and PDA
MP3 Players
Digital Cameras Handheld Devices
Internet Appliances
DESCRIPTION
The bqTINY™ III-series of devices are highly
integrated Li-ion linear chargers and system
power-path management devices targeted at
space-limited portable applications. The bqTINY
III-series offer integrated USB-port and DC supply
(AC adapter), power-path management with
autonomous power-source selection, power FETs
and current sensors, high accuracy current and
voltage regulation, charge status, and charge
termination, in a single monolithic device.
The bqTINY III-series powers the system while
independently charging the battery. This feature
reduces the charge and discharge cycles on the
battery, allows for proper charge termination and
allows the system to run with an absent or defective
battery pack. This feature also allows for the system
to instantaneously turn on from an external power
source in the case of a deeply discharged battery
pack. The IC design is focused on supplying
continuous power to the system when available from
the AC, USB, or battery sources.
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POWER FLOW DIAGRAM
AC Adapter
VDC
USB Port
D+
D−
VBUS
GND
GND
USB
System
Q1
40
mΩ
BAT
+
PACK−
Q3
bq2403x
Q2
UDG−04082
AC
(2)
OUT
PACK+
(1)
(2)
See Figure 2 and functional block diagram for more detailed feature information.
P-FET back gate body diodes are disconnected to prevent body diode conduction.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
bqTINY is a trademark of Texas Instruments.
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2006, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
