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BQ24740_07

更新时间： 2022-04-23 23:00:11
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德州仪器 - TI 电池
页数 文件大小 规格书
32页 1256K
描述
Host-controlled Multi-chemistry Battery Charger with Low Input Power Detect

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BQ24740_07 数据手册

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bq24740  
www.ti.com  
SLUS736–DECEMBER 2006  
Host-controlled Multi-chemistry Battery Charger with Low Input Power Detect  
FEATURES  
APPLICATIONS  
•
•
•
•
•
•
Notebook and Ultra-Mobile Computers  
Portable Data-Capture Terminals  
Portable Printers  
Medical Diagnostics Equipment  
Battery Bay Chargers  
•
•
•
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  
Battery Back-up Systems  
–
–
–
–
±0.5% Charge Voltage Accuracy  
±3% Charge Current Accuracy  
DESCRIPTION  
The bq24740 is  
a high-efficiency, synchronous  
±3% Adapter Current Accuracy  
±2% Input Current Sense Amp Accuracy  
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 very high regulation  
accuracies, and can be either hardwired with  
•
•
Integration  
–
–
Internal Loop Compensation  
Internal Soft Start  
Safety  
resistors  
or  
programmed  
by  
the  
system  
–
–
Input Overvoltage Protection (OVP)  
power-management microcontroller using a DAC or  
GPIOs.  
Dynamic Power Management (DPM) with  
Status Indicator  
The bq24740 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.  
–
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)  
28 27 26 25 24 23 22  
Charge Current (up to 10 A, with 10-mΩ  
sense resistor)  
1
2
3
4
5
6
7
21  
20  
19  
18  
17  
16  
15  
CHGEN  
ACN  
DPMDET  
CELLS  
SRP  
–
Adapter Current Limit (DPM)  
bq24740  
28 LD QFN  
TOP VIEW  
ACP  
•
Status and Monitoring Outputs  
LPMD  
ACDET  
ACSET  
LPREF  
SRN  
–
AC/DC Adapter Present with  
Programmable Voltage Threshold  
BAT  
SRSET  
IADAPT  
–
Low Input-Power Detect with Adjustable  
Threshold and Hysteresis  
8
9
10 11 12 13 14  
–
–
DPM Loop Active  
Current Drawn from Input Source  
•
•
Battery Discharge Current Sense with No  
Adapter, or Selectable Low-Iq mode  
Supports Any Battery Chemistry: Li+, NiCd,  
NiMH, Lead Acid, etc.  
•
•
•
Charge Enable  
10-µA Off-State Current  
28-pin, 5x5-mm QFN package  
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 © 2006, Texas Instruments Incorporated  
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