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BQ24257

更新时间： 2024-09-16 12:31:27
品牌 Logo 应用领域
德州仪器 - TI 电池开关电阻器
页数 文件大小 规格书
45页 2225K
描述
2A Single Input I2C, Standalone Switch-Mode Li-Ion Battery Charger with Integrated Current Sense Resistor

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BQ24257 数据手册

 浏览型号BQ24257的Datasheet PDF文件第2页浏览型号BQ24257的Datasheet PDF文件第3页浏览型号BQ24257的Datasheet PDF文件第4页浏览型号BQ24257的Datasheet PDF文件第5页浏览型号BQ24257的Datasheet PDF文件第6页浏览型号BQ24257的Datasheet PDF文件第7页 
bq24257  
bq24258  
www.ti.com  
SLUSBG0B –FEBRUARY 2013–REVISED JULY 2013  
2A Single Input I2C, Standalone Switch-Mode Li-Ion Battery Charger with Integrated  
Current Sense Resistor  
Check for Samples: bq24257, bq24258  
1
FEATURES  
234  
•
High-efficiency Switch-mode Charger with  
Integrated Current Sense Resistor  
•
•
•
Watchdog Timer with Disable Bit  
Integrated 4.9 V, 50 mA LDO  
•
BC1.2 D+, D– Detection with Dead Battery  
Provision (DBP) Pin to Sync with External  
USB-PHI  
Complete System Level Protection  
–
Input UVLO, Input Overvoltage Protection  
(OVP), Battery OVP, Sleep Mode, VIN_DPM  
•
•
USB Charging Compliant  
–
–
–
–
Input Current Limit  
Selectable Input Current Limit of 100 mA,  
150 mA, 500 mA, 900 mA. 1.5 A, and 2 A  
In Host Mode (after I2C™ Communication and  
Before Watchdog Timer Times Out)  
Charge Current Limit  
Thermal Regulation and Thermal Shutdown  
•
Voltage Based, JEITA Compatible NTC  
Monitoring Input  
–
Programmable Battery Charge Voltage  
(VBATREG  
Programmable Battery Charge Current  
(ICHG  
–
Safety Timer  
)
•
•
•
20 V Maximum Input Voltage Rating  
–
10.5 V Maximum Operating Input Voltage  
)
Low RDS(on) Integrated Sense Resistor for up to  
2 A Charging Rate  
–
–
Programmable Input Current Limit (ILIM  
)
Programmable Input Voltage Based  
•
•
Open Drain Status Outputs  
Dynamic Power Management Threshold  
(VIN_DPM  
Programmable Input Overvoltage  
Protection Threshold (VOVP  
Programmable Safety Timer.  
)
Synchronous Fixed-frequency PWM Controller  
Operating at 3 MHz for Small Inductor Support  
–
–
)
•
•
AnyBoot Robust Battery Detection Algorithm  
Charge Time Optimizer for Improved Charge  
Times at any Given Charge Current  
•
In Standalone Mode (before I2C™  
Communication and After Watchdog Timer  
Times Out)  
APPLICATIONS  
•
•
•
•
Mobile Phones, Smart Phones  
MP3 Players  
–
–
–
Resistor Programmable ICHG up to 2 A With  
Current Monitoring Output (ISET  
Resistor Programmable ILIM up to 2 A With  
Current Monitoring Output (ILIM  
Resistor Programmable VIN_DPM (VDPM)  
)
Handheld Devices  
)
Portable Media Player  
DESCRIPTION  
The bq2425x is a highly integrated single-cell Li-Ion battery charger with integrated current sense resistor  
targeted for space-limited, portable applications with high capacity batteries. The single cell charger has a single  
input that operates from either a USB port or AC wall adapter for a versatile solution. BC1.2 compatible D+, D-  
detection allows for recognition of CDP, DCP, SDP, and non-standard USB adapters. The use of an accessory  
dead battery provision (DBP) pin allows for the system to sync a dead battery state in order to enable or disable  
the BC1.2 detection in the event of an external USB-PHI.  
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.  
2
3
4
NanoFree is a trademark of Texas Instruments.  
I2C is a trademark of NXP B.V. Corporation.  
All other trademarks are the property of their respective owners.  
UNLESS OTHERWISE NOTED this document contains  
PRODUCTION DATA information current as of publication date.  
Products conform to specifications per the terms of Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2013, Texas Instruments Incorporated  
 
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