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BQ24038 Datasheet

  • BQ24038

  • 充電器，具有動(dòng)態(tài)電源路徑管理、輸出穩(wěn)壓至 4.4V、電池穩(wěn)壓 4.4V

  • 953.83KB

  • 34頁

  • TI

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bq24030, bq24031, bq24032,
bq24032A, bq24035, bq24038, bq24039
www.ti.com
SLUS618C 鈥?AUGUST 2004 鈥?REVISED JUNE 2005
SINGLE-CHIP CHARGE AND SYSTEM POWER-PATH MANAGEMENT IC (bqTINY鈩?III)
FEATURES
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Small 3,5 mm 脳 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
USB High Current Regulation Limit, 1 A Max
(bq24039 Only)
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: 4.2 V or 4.36 V
APPLICATIONS
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Smart Phones and PDA
MP3 Players
Digital Cameras Handheld Devices
Internet Appliances
DESCRIPTION
The bqTINY鈩?III series of devices are highly inte-
grated Li-ion linear chargers and system power-path
management devices targeted at space-limited port-
able applications. The bqTINY-III series offer inte-
grated 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 regu-
lation, charge status, and charge termination, in a
single monolithic device.
The bqTINY-III powers the system while indepen-
dently 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
(1)
AC Adapter
VDC
USB Port
D+
D鈭?/div>
VBUS
GND
GND
USB
System
Q1
40
m鈩?/div>
BAT
+
PACK鈭?/div>
Q3
bq2403x
Q2
UDG鈭?4082
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 PRO-
DUCTION DATA information current as of publication date. Prod-
ucts conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily
include testing of all parameters.
Copyright 漏 2004鈥?005, Texas Instruments Incorporated

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