BQ24765 Datasheet, PDF (1/36 Pages) Texas Instruments – SMBus-Controlled Multi-Chemistry Battery Charger With Integrated Power MOSFETs

bq24765
www.ti.com
SLUS999 – NOVEMBER 2009
SMBus-Controlled Multi-Chemistry Battery Charger With Integrated Power MOSFETs
Check for Samples :bq24765
FEATURES
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• Integrated Power MOSFETs, NMOS-NMOS,
Synchronous Buck Converter
• >95% Efficiency
• Frequency 700kHz Allows Smaller Inductor
(5mm x 5mm)
• Thermal Regulation Loop for Safety, Limit T_J =
120°C
• Adaptive 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
– Integrated Power MOSFETs
– Input Current Comparator
– Internal Soft-Start
• Safety
– Thermal Regulation Loop and Thermal
Shutdown
– Dynamic Power Management (DPM)
– Power FETs Over Current Protection
• 7 V–24 V AC/DC-Adapter Operating Range
• Simplified SMBus Control
– 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+, LiFePO4,
NiCd, NiMH, Lead Acid (2, 3, and 4 Li-Ion Cells)
• Charge Enable Pin (CE)
• Energy Star Low Iq
– < 10-μA Battery Current with Adapter
Removed
– < 1 mA Input DCINA Current When Adapter
Present and Charge Disabled
• 34-pin, 3.5mmx7mm 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 bq24765 is a high-efficiency, synchronous
battery charger with two integrated 30mΩ NMOS
power MOSFETs, and an integrated input current
comparator, offering low component count for
space-constraint, multi-chemistry battery charging
applications. Input current, charge current, and
charge voltage DACs allow for very high regulation
accuracies that can be easily programmed by the
system power management micro-controller using
SMBus. The bq24765 has switching frequency of
700kHz. The bq24765 charges 2, 3, or 4 series Li+
cells, and is available in a 34-pin, 3.5mmx7mm QFN
package.
34 33 32 31 30
PGND 1
DCINP ₂
DCINP 3
DCINP ⁴
CSSN 5
CSSP 6
VREF 7
ICREF 8
ACIN ₉
EAO ¹⁰
EAI 11
FBO 12
bq24765
34 LD
QFN
TOP VIEW
29 PHASE
28 PHASE
27 PHASE
26 BOOT
25 DCINA
24 VDDP
23 ICOUT
22 CSOP
21 CSON
20 VFB
19 AGND
18 ACOK
13 14 15 16 17
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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