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BQ24765

更新时间： 2024-09-25 12:50:35
品牌 Logo 应用领域
德州仪器 - TI 电池
页数 文件大小 规格书
36页 1463K
描述
SMBus-Controlled Multi-Chemistry Battery Charger With Integrated Power MOSFETs

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BQ24765 数据手册

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bq24765  
www.ti.com  
SLUS999 –NOVEMBER 2009  
SMBus-Controlled Multi-Chemistry Battery Charger With Integrated Power MOSFETs  
Check for Samples :bq24765  
1
FEATURES  
–
–
< 10-μA Battery Current with Adapter  
Removed  
•
Integrated Power MOSFETs, NMOS-NMOS,  
Synchronous Buck Converter  
< 1 mA Input DCINA Current When Adapter  
Present and Charge Disabled  
•
•
>95% Efficiency  
•
34-pin, 3.5mmx7mm QFN Package  
Frequency 700kHz Allows Smaller Inductor  
(5mm x 5mm)  
APPLICATIONS  
•
•
•
Thermal Regulation Loop for Safety, Limit TJ =  
120°C  
•
•
•
•
•
•
Notebook and Ultra-Mobile Computers  
Portable Data-Capture Terminals  
Portable Printers  
Medical Diagnostics Equipment  
Battery Bay Chargers  
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  
Battery Back-up Systems  
±3% Adapter Current Accuracy  
±2% Input Current Sense Amp Accuracy  
DESCRIPTION  
The bq24765 is  
a high-efficiency, synchronous  
•
•
Integration  
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.  
–
–
–
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)  
34 33 32 31  
30  
PGND  
DCINP  
1
29 PHASE  
PHASE  
28  
Adapter Current Limit DPM DAC (256  
mA–11.008 A)  
2
3
4
DCINP  
27 PHASE  
26 BOOT  
DCINP  
CSSN  
•
Status and Monitoring Outputs  
DCINA  
25  
5
6
7
bq24765  
34 LD  
QFN  
–
–
–
AC/DC Adapter Present with Adjustable  
Voltage Threshold  
CSSP  
VREF  
24 VDDP  
23 ICOUT  
TOP VIEW  
ICREF  
ACIN  
8
22 CSOP  
Input Current Comparator, With Adjustable  
Threshold and Hysteresis  
CSON  
9
21  
10  
20 VFB  
EAO  
EAI  
Current Sense Amplifier for Current Drawn  
From Input Source  
AGND  
11  
12  
19  
18  
ACOK  
FBO  
•
•
Charge Any Battery Chemistry: Li+, LiFePO4,  
NiCd, NiMH, Lead Acid (2, 3, and 4 Li-Ion Cells)  
13 14 15 16  
17  
Charge Enable Pin (CE)  
Energy Star Low Iq  
•
1
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  
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