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BQ76925RGE PDF预览

BQ76925RGE

更新时间： 2024-11-15 08:59:11
品牌 Logo 应用领域
德州仪器 - TI 电源电路电池电源管理电路
页数 文件大小 规格书
29页 742K
描述
Host Controlled Analog Front End for 3 to 6 Series Cell Lithium-Ion/ Polymer Battery

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BQ76925RGE 技术参数

生命周期：Obsolete零件包装代码：QFN
包装说明：PLASTIC, QFN-24针数：24
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.68
Is Samacsys：N可调阈值：YES
模拟集成电路 - 其他类型：POWER SUPPLY SUPPORT CIRCUITJESD-30 代码：S-PQCC-N24
长度：4 mm信道数量：1
功能数量：1端子数量：24
最高工作温度：85 °C最低工作温度：-25 °C
封装主体材料：PLASTIC/EPOXY封装代码：VQCCN
封装形状：SQUARE封装形式：CHIP CARRIER, VERY THIN PROFILE
认证状态：Not Qualified座面最大高度：1 mm
最大供电电压 (Vsup)：26.4 V最小供电电压 (Vsup)：4.2 V
标称供电电压 (Vsup)：21.6 V表面贴装：YES
温度等级：OTHER端子形式：NO LEAD
端子节距：0.5 mm端子位置：QUAD
宽度：4 mmBase Number Matches：1

BQ76925RGE 数据手册

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bq76925  
www.ti.com  
SLUSAM9A –JULY 2011–REVISED JULY 2011  
Host Controlled Analog Front End for 3 to 6 Series Cell Lithium-Ion/ Polymer Battery  
Protection and Gas Gauging Applications  
Check for Samples: bq76925  
1
FEATURES  
DESCRIPTION  
The bq76925 Host controlled analog front end (AFE)  
is part of a complete pack monitoring, balancing and  
protection system for 3, 4, 5 or 6 series cell Lithium  
batteries. The bq76925 allows a Host controller to  
easily monitor individual cell voltages, pack current  
and temperature. This information may be used by  
the Host to determine unsafe or faulty operating  
conditions such as over-voltage, under-voltage,  
over-temperature and over-current, as well as cell  
imbalance, state of charge and state of health  
conditions.  
•
Analog Interface for Host cell Measurement  
–
–
Cell Input MUX, Level Shifter and Scaler  
1.5 / 3.0 V Low-Drift, Calibrated Reference  
Allows Accurate Analog to Digital  
Conversions  
•
Analog Interface for Host Current  
Measurement  
–
Variable Gain Current Sense Amplifier  
Capable of Operation with 1 mΩ Sense  
Resistor  
Cell input voltages are level shifted, multiplexed,  
scaled and output for measurement by a Host ADC.  
A low-drift calibrated reference voltage is provided on  
a dedicated pin to enable accurate measurements.  
•
•
Switchable Thermistor Bias output for Host  
Temperature Measurements  
Overcurrent Comparator with Dynamically  
Adjustable Threshold  
The voltage across an external sense resistor is  
amplified and output to a Host ADC for both charge  
and discharge current measurements. Two gain  
settings enable operation with a variety of sense  
resistor values over a wide range of pack currents.  
–
–
Alerts Host to Potential Overcurrent Faults  
May be used to Wake up Host on Load  
Connect  
•
Integrated Cell Balancing FETs  
To enable temperature measurements by the Host,  
the AFE provides a separate output pin for biasing an  
external thermistor network. This output can be  
switched on and off under Host control to minimize  
power consumption.  
–
–
Individual Host Control  
50 mA per-cell Balancing Current  
•
•
Supports Cell Sense-line Open Wire Detection  
Integrated 3.3 V Regulator for Powering  
Micro-controller and/or LEDs  
I2C Interface for Host Communications  
The bq76925 includes  
a
comparator with  
a
dynamically selectable threshold for monitoring  
current. The comparator result is driven through an  
open-drain output to alert the host when the threshold  
is exceeded. This feature can be used to wake up the  
Host on connection of the load, or to alert the Host to  
a potential fault condition.  
•
–
Optional Packet CRC for Robust Operation  
•
•
Supply Voltage Range From 4.2 to 26.4 V  
Low Power Consumption  
–
–
40 µA Typical in Normal Mode  
1.5 µA Maximum in Sleep Mode  
The bq76925 integrates cell balancing FETs that are  
fully controlled by the Host. The balancing current is  
set by external resistors up to a maximum value of 50  
mA. These same FETs may be utilized in conjunction  
with cell voltage measurements to detect an open  
wire on a cell sense-line.  
•
20-pin TSSOP or 24-pin QFN Package  
APPLICATIONS  
•
Primary Protection in Li-Ion Battery Packs  
The Host communicates with the AFE via an I2C  
interface. A packet CRC may optionally be used to  
ensure robust operation. The device may be put into  
a low-current sleep mode via the I2C interface and  
awakened by pulling up the ALERT pin.  
–
–
Cordless Power Tools  
Light Electric Vehicles (E-Bike, Scooter,  
etc.)  
–
–
–
UPS Systems  
Medical Equipment  
Portable Test Equipment  
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.  
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 © 2011, Texas Instruments Incorporated  
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