BQ24747 Datasheet, PDF (1/36 Pages) Texas Instruments – SMBus-Controlled Level 2 Multi-Chemistry Battery Charger With Input Current Detect Comparator and Charge Enable Pin

bq24747
www.ti.com ............................................................................................................................................................................................. SLUS988 – OCTOBER 2009
SMBus-Controlled Level 2 Multi-Chemistry Battery Charger With Input
Current Detect Comparator and Charge Enable Pin
Check for Samples :bq24747
FEATURES
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• NMOS-NMOS Synchronous Buck Converter
with 300 kHz Frequency and >95% Efficiency
• 30-ns Minimum Driver Dead-time and 99.5%
Maximum Effective Duty Cycle
• High-Accuracy Voltage and Current Regulation
– ±0.5% Charge Voltage Accuracy
– ±3% Charge Current Accuracy
– ±3% Adapter Current Accuracy
– ±2% Input Current Sense Amp Accuracy
• Integration
– Input Current Comparator, With Adjustable
Threshold and Hysteresis
– Internal Soft-Start
• Safety
– Input Overvoltage Protection (OVP)
– Dynamic Power Management (DPM)
• Up to 19.2 V Battery Voltage
• 7 V–24 V AC/DC-Adapter Operating Range
• Simplified SMBus Control Interface
– Charge Voltage DAC (1.024 V–19.2 V)
– Charge Current DAC (128 mA–8.064 A)
– Adapter Current Limit DPM DAC (256
mA–11.008 A)
• Status and Monitoring Outputs
– AC/DC Adapter Present with Adjustable
Voltage Threshold
– Input Current Comparator, With Adjustable
Threshold and Hysteresis
– Current Sense Amplifier for Current Drawn
From Input Source
• Charge Any Battery Chemistry: Li+, NiCd,
NiMH, Lead Acid, etc.
• Charge Enable Pin
• < 10-μBattery Current with Adapter Removed
• < 1 mA Input DCIN Current with Adapter
Present and Charge Disabled
• 28-pin, 5x5-mm² QFN Package
APPLICATIONS
• Notebook and Ultra-Mobile Computers
• Portable Data-Capture Terminals
• Portable Printers
• Medical Diagnostics Equipment
• Battery Bay Chargers
• Battery Back-up Systems
DESCRIPTION
The bq24747 is a high-efficiency, synchronous
battery charger with an integrated input-current
comparator, offering low component count for
space-constrained, multi-chemistry battery-charging
applications. The input-current, charge-current, and
charge-voltage DACs allow very high regulation
accuracies that can be easily programmed by the
system power-management microcontroller using the
SMBus interface. The bq24747 charges two, three, or
four series Li+ cells, and is available in a 28-pin, 5x5
mm² QFN package.
ICREF 1
ACIN 2
VREF 3
EAO ⁴
EAI 5
FBO 6
CE 7
28 27 26 25 24 23 22
bq24747
28 LD QFN
TOP VIEW
21 VDDP
20 LGATE
19 PGND
18 CSOP
17 CSON
16 NC
15 VFB
8 9 10 11 12 13 14
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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.
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