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BQ24751ARHDT

更新时间： 2024-09-25 04:34:39
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德州仪器 - TI 电池
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36页 1549K
描述
Host-controlled Multi-Chemistry Battery Charger With System Power Selector, AC Over-Power Protection, Programmable OVP and Low Iq

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BQ24751ARHDT 数据手册

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bq24751A  
www.ti.com  
SLUS756–SEPTEMBER 2007  
Host-controlled Multi-Chemistry Battery Charger With System Power Selector, AC  
Over-Power Protection, Programmable OVP and Low Iq  
1
FEATURES  
•
•
28-pin, 5x5-mm QFN package  
Energy Star Low Iq  
•
•
•
NMOS-NMOS Synchronous Buck Converter  
with 300 kHz Frequency and >95% Efficiency  
–
–
< 10-μA Off-State Battery Discharge Current  
30-ns Minimum Driver Dead-time and 99.5%  
Maximum Effective Duty Cycle  
< 1.5-mA Off-State Input Quiescent Current  
High-Accuracy Voltage and Current Regulation  
APPLICATIONS  
•
•
•
•
•
•
Notebook and Ultra-Mobile Computers  
Portable Data Capture Terminals  
Portable Printers  
Medical Diagnostics Equipment  
Battery Bay Chargers  
–
–
–
–
±0.5% Charge Voltage Accuracy  
±3% Charge Current Accuracy  
±3% Adapter Current Accuracy  
±2% Input Current Sense Amp Accuracy  
•
•
Integration  
Battery Back-up Systems  
–
Automatic System Power Selection From  
AC/DC Adapter or Battery  
Internal Loop Compensation  
Internal Soft Start  
DESCRIPTION  
–
–
The bq24751A is a high-efficiency, synchronous  
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 resistors  
or programmed by the system power-management  
microcontroller using a DAC or GPIOs.  
Safety  
–
–
–
–
Programmable Input Overvoltage  
Protection (OVP)  
Dynamic Power Management (DPM) with  
Status Indicator  
Programmable Inrush Adapter Power  
(ACOP) and Overcurrent (ACOC) Limits  
The bq24751A 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)  
27 26 25 24 23 22  
28  
1
2
CHGEN  
ACN  
LEARN  
20 CELLS  
SRP  
19  
21  
Charge Current (up to 10 A, with 10-mΩ  
sense resistor)  
bq24751A  
28 LD QFN  
TOP VIEW  
ACP  
3
4
5
6
–
Adapter Current Limit (DPM)  
ACDRV  
ACDET  
ACSET  
ACOP  
18 SRN  
•
Status and Monitoring Outputs  
BAT  
17  
–
AC/DC Adapter Present with Programmable  
Voltage Threshold  
16 SRSET  
IADAPT  
15  
7
–
Current Drawn from Input Source  
8
9
10 11 12 13 14  
•
•
Battery Learn Cycle Control  
Supports Any Battery Chemistry: Li+, NiCd,  
NiMH, Lead Acid, etc.  
•
Charge Enable  
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 © 2007, Texas Instruments Incorporated  
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BQ24751ARHDT 替代型号

型号 品牌 替代类型 描述 数据表
BQ24751ARHDTG4 TI

完全替代

 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC28, 5 X 5 MM, GREEN, PLASTIC, QFN-28
BQ24751ARHDRG4 TI

完全替代

 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC28, 5 X 5 MM, GREEN, PLASTIC, QFN-28
BQ24751ARHDR TI

完全替代

 Host-controlled Multi-Chemistry Battery Charger With System Power Selector, AC Over-Power

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BQ24751RHDT TI

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