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BQ24750_07

更新时间： 2024-11-26 04:34:39
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德州仪器 - TI 电池
页数 文件大小 规格书
38页 1511K
描述
Host-controlled Multi-chemistry Battery Charger with Integrated System Power Selector and AC Over-Power Protection

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BQ24750_07 数据手册

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bq24750  
www.ti.com  
SLUS735–DECEMBER 2006  
Host-controlled Multi-chemistry Battery Charger with Integrated System Power Selector  
and AC Over-Power Protection  
FEATURES  
•
•
•
Charge Enable  
•
•
•
NMOS-NMOS Synchronous Buck Converter  
with 300 kHz Frequency and >95% Efficiency  
10-µA Off-State Current  
28-pin, 5x5-mm QFN package  
30-ns Minimum Driver Dead-time and 99.5%  
Maximum Effective Duty Cycle  
APPLICATIONS  
•
•
•
•
•
•
Notebook and Ultra-Mobile Computers  
Portable Data-Capture Terminals  
Portable Printers  
Medical Diagnostics Equipment  
Battery Bay Chargers  
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  
Battery Back-up Systems  
•
•
Integration  
DESCRIPTION  
–
Automatic System Power Selection From  
The bq24750 is  
a high-efficiency, synchronous  
AC/DC Adapter or Battery  
Internal Loop Compensation  
Internal Soft Start  
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  
–
–
Safety  
–
–
Input Overvoltage Protection (OVP)  
Dynamic Power Management (DPM) with  
Status Indicator  
resistors  
or  
programmed  
by  
the  
system  
power-management microcontroller using a DAC or  
GPIOs.  
–
Programmable Inrush Adapter Power  
(ACOP) and Overcurrent (ACOC) Limits  
–
–
Reverse-Conduction Protection Input FET  
Battery Thermistor Sense Input (TS) for  
Charge Qualification  
28 27 26 25 24 23 22  
•
•
•
Supports Two, Three, or Four Li+ Cells  
5–24 V AC/DC-Adapter Operating Range  
CHGEN  
ACN  
1
2
3
4
5
6
7
21  
20  
19  
DPMDET  
CELLS  
SRP  
Analog Inputs with Ratiometric Programming  
via Resistors or DAC/GPIO Host Control  
bq24750  
28 LD QFN  
TOP VIEW  
ACP  
ACDRV  
ACDET  
ACSET  
ACOP  
18 SRN  
–
–
Charge Voltage (4–4.512 V/cell)  
BAT  
17  
Charge Current (up to 10 A, with 10-mΩ  
SRSET  
IADAPT  
16  
15  
sense resistor)  
–
Adapter Current Limit (DPM)  
8
9
10 11 12 13 14  
•
•
Status and Monitoring Outputs  
–
AC/DC Adapter Present with  
Programmable Voltage Threshold  
–
–
DPM Loop Active  
Current Drawn from Input Source  
Supports Any Battery Chemistry: Li+, NiCd,  
NiMH, Lead Acid, etc.  
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  
1234567...38

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