BQ24105-Q1 Datasheet, PDF (1/35 Pages) Texas Instruments – SYNCHRONOUS SWITCHMODE, LI-ION AND LI-POLYMER CHARGE-MANAGEMENT IC WITH INTEGRATED POWER FETs ( bqSWITCHER™)

bq24105-Q1
www.ti.com................................................................................................................................................................................................. SLUS953 – AUGUST 2009
SYNCHRONOUS SWITCHMODE, LI-ION AND LI-POLYMER CHARGE-MANAGEMENT
IC WITH INTEGRATED POWER FETs ( bqSWITCHER™)
FEATURES
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•23 Qualified for Automotive Applications
• Ideal For Highly Efficient Charger Designs For
Single-, Two-, or Three-Cell Li-Ion and
Li-Polymer Battery Packs
• Also for LiFePO₄ Battery (see Using bq24105
to Charge LiFePO4 Battery)
• Integrated Synchronous Fixed-Frequency
PWM Controller Operating at 1.1 MHz
With 0% to 100% Duty Cycle
• Integrated Power FETs For Up To 2-A Charge
Rate
• High-Accuracy Voltage and Current Regulation
• Stand-Alone (Built-In Charge Management and
Control) Version
• Status Outputs For LED or Host Processor
Interface Indicates Charge-In-Progress, Charge
Completion, Fault, and AC-Adapter Present
Conditions
• 20-V Maximum Voltage Rating on IN and OUT
Pins
• High-Side Battery Current Sensing
• Battery Temperature Monitoring
• Automatic Sleep Mode for Low Power
Consumption
• Reverse Leakage Protection Prevents Battery
Drainage
• Thermal Shutdown and Protection
• Built-In Battery Detection
• Available in 20-Pin, 3.5 mm × 4.5 mm, QFN
Package
DESCRIPTION
The bqSWITCHER™ series are highly integrated
Li-ion and Li-polymer switch-mode charge
management devices targeted at a wide range of
portable applications. The bqSWITCHER™ series
offers integrated synchronous PWM controller and
power FETs, high-accuracy current and voltage
regulation, charge preconditioning, charge status, and
charge termination, in a small, thermally enhanced
QFN package.
The bqSWITCHER charges the battery in three
phases: conditioning, constant current, and constant
voltage. Charge is terminated based on
user-selectable minimum current level. A
programmable charge timer provides a safety backup
for charge termination. The bqSWITCHER
automatically restarts the charge cycle if the battery
voltage falls below an internal threshold. The
bqSWITCHER automatically enters sleep mode when
V_CC supply is removed.
RHL PACKAGE
(TOP VIEW)
STAT1
IN
IN
PG
VCC
TTC
ISET1
ISET2
21
3
4
5
6
7
8
9 ¹⁰
20 19
18
17
16
15
14
13
11 ₁₂
STAT2
PGND
PGND
CE
SNS
BAT
FB
TS
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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.
bqSWITCHER, PowerPAD are trademarks of Texas Instruments.
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All other trademarks are the property of their respective owners.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated