BQ24753 Datasheet, PDF (1/38 Pages) Texas Instruments – Host-Controlled Multi-Chemistry Battery Charger with Low Iq and System Power Selector

bq24753
www.ti.com........................................................................................................................................ SLUS885A – DECEMBER 2008 – REVISED DECEMBER 2008
Host-Controlled Multi-Chemistry Battery Charger with Low I_q and System Power Selector
FEATURES
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•2 NMOS-NMOS Synchronous Buck Converter
with 300 kHz Frequency and >95% Efficiency
APPLICATIONS
• Notebook and Ultra-Mobile Computers
• Portable Data Capture Terminals
• 30-ns Minimum Driver Dead-time and 99.5%
Maximum Effective Duty Cycle
• Portable Printers
• Medical Diagnostics Equipment
• High-Accuracy Voltage and Current Regulation
– ±0.5% Charge Voltage Accuracy
• Battery Bay Chargers
• Battery Back-up Systems
– ±3% Charge Current Accuracy
– ±3% Adapter Current Accuracy
– ±2% Input Current Sense Amp Accuracy
• Integration
– Automatic System Power Selection From
AC/DC Adapter or Battery
– Internal Loop Compensation
– Internal Soft Start
• Safety
DESCRIPTION
The bq24753 is a high-efficiency, synchronous
battery charger with integrated compensation and
system power selector logic, offering low component
count for space-constrained multi-chemistry battery
charging applications. Ratiometric charge current and
voltage programming allows for high regulation
accuracies, and can be either hardwired with resistors
or programmed by the system power-management
microcontroller using a DAC or GPIOs.
– Programmable Input Overvoltage
Protection (OVP)
– Dynamic Power Management (DPM)
The bq24753 charges two, three, or four series Li+
cells, supporting up to 10 A of charge current, and is
available in a 28-pin, 5x5-mm thin QFN package.
– Programmable Inrush Adapter Power
(ACOP) and Overcurrent (ACOC) Limits
– Reverse-Conduction Protection Input FET
• Supports Two, Three, or Four Li+ Cells
• 5 – 24 V AC/DC-Adapter Operating Range
• Analog Inputs with Ratiometric Programming
via Resistors or DAC/GPIO Host Control
– Charge Voltage (4-4.512 V/cell)
– Charge Current (up to 10 A, with 10-mΩ
Sense Resistor)
CHGEN
ACN
ACP
ACDRV
ACDET
28 27 26 25 24 23 22
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20
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bq24753
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28 LD QFN
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TOP VIEW
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LEARN
CELLS
SRP
SRN
BAT
– Adapter Current Limit (DPM)
ACSET ⁶
16 SRSET
• Status and Monitoring Outputs
ACOP 7
15 IADAPT
– AC/DC Adapter Present with Programmable
Voltage Threshold
8 9 10 11 12 13 14
– Current Drawn from Input Source
• Battery Learn Cycle Control
• Supports Any Battery Chemistry: Li+, NiCd,
NiMH, Lead Acid, etc.
• Charge Enable
• 28-pin, 5x5-mm QFN package
• Energy Star Low I_q
– < 10 µA Off-State Battery Discharge Current
1 _{– < 1.5 mA Off-State Input Quiescent Current}
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.
All trademarks are the property of their respective owners.
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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 © 2008, Texas Instruments Incorporated