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参数资料
| 型号： | LTC2941IDCB-1#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | 2 X 3 MM, LEAD FREE, PLASTIC, MO-229TBD, DFN-6 |
| 文件页数： | 14/16页 |
| 文件大小： | 206K |
| 代理商： | LTC2941IDCB-1#TRPBF |
LTC2941-1
29411f
operaTion
Overview
The LTC2941-1 is a battery gas gauge device designed for
use with single Li-Ion cells and other battery types with
terminal voltages from 2.7V to 5.5V. A precision coulomb
counterintegratescurrentthroughaninternalsenseresis-
tor between the battery’s positive terminal and the load or
charger. The integrated, temperature-compensated sense
resistor offers board space savings and superior charge
measurement accuracy in applications with currents up
to 1A.
Coulomb Counter
Charge is the time integral of current. The LTC2941-1 mea-
sures battery current by monitoring the voltage developed
across its internal sense resistor and then integrates this
information to infer charge. The internal sense resistor is
tied between the SENSE+ and SENSE– pins and is con-
nected to an auto-zeroed differential analog integrator
which converts the measured current to charge.
When the integrator output reaches the REFHI or REFLO
thresholds, switches S1, S2, S3 and S4 toggle to reverse
the ramp direction. By observing the condition of the
switches and the ramp direction, polarity is determined. A
programmable prescaler effectively increases integration
time by a factor M programmable from 1 to 128. At each
underflow or overflow of the prescaler, the accumulated
chargeregister(ACR)valueisincrementedordecremented
one count. The value of accumulated charge is read via
the I2C interface.
Power-Up Sequence
When VSENSE+ rises above a threshold of approximately
2.5V, the LTC2941-1 generates an internal power-on
reset (POR) signal and sets all registers to their default
state. In the default state, the coulomb counter is active.
The accumulated charge is set to mid-scale (7FFFh), the
low threshold registers are set to 0000h and all the high
threshold registers are set to FFFFh. The alert mode is
enabled and the coulomb counter pre-scaling factor M
is set to 128.
–
+
–
+
–
+
S4
REFHI
REFLO
S3
S2
S1
LOAD
CHARGER
SENSE+
RSENSE
RBOND
BATTERY
IBAT
1
5
SENSE–
6
GND
2
POLARITY
DETECTION
CONTROL
LOGIC
PRE-
SCALER
M
I2C/
SMBus
REGISTERS
AL/CC
3
SCL
4
SDA
29411 F03
STATUS
CONTROL
ACR
THRESHOLDS
VSUPPLY
Figure 3. Coulomb Counter Section of the LTC2941-1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC2942CDCB#PBF | 制造商:Linear Technology 功能描述:IC, BATTERY GAS GAUGE, LI-ION, DFN-6; Battery Management Function:Fuel Gauge; Battery Type:Li-Ion; Supply Voltage Min:2.7V; Supply Voltage Max:5.5V; Battery IC Case Style:DFN; No. of Pins:6; IC Interface Type:I2C ;RoHS Compliant: Yes |
| LTC2942CDCB#TRMPBF | 功能描述:IC FUEL/GAS GAUGE LI-ION 6DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTC2942CDCB#TRPBF | 功能描述:IC FUEL/GAS GAUGE LI-ION 6DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC2942CDCB-1#PBF | 制造商:Linear Technology 功能描述:IC BATTERY FUEL GAUGE LI-ION 5.5V DFN-6 制造商:Linear Technology 功能描述:IC, BATTERY FUEL GAUGE LI-ION 5.5V DFN-6 制造商:Linear Technology 功能描述:IC, BATTERY FUEL GAUGE LI-ION 5.5V DFN-6; Battery Management Function:Fuel Gauge, Charge Controller; Battery Type:Li-Ion; Supply Voltage Min:2.7V; Supply Voltage Max:5.5V; Battery IC Case Style:DFN; No. of Pins:6 ;RoHS Compliant: Yes |
| LTC2942CDCB-1#TRMPBF | 功能描述:IC FUEL/GAS GAUGE LI-ION 1A 6DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
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