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参数资料
| 型号： | LTC2941IDCB-1#TRMPBF |
| 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： | 6/16页 |
| 文件大小： | 206K |
| 代理商： | LTC2941IDCB-1#TRMPBF |
LTC2941-1
29411f
applicaTions inFormaTion
where the factor 1.22 approximates the effect of sense
resistor self-heating, RPP(MAX) is the maximum pad-to-
pad resistance at nominal temperature (27°C) and
θJA is
the thermal resistance from junction to ambient. The
θJA
data given for the DFN package is valid for typical PCB
layouts; more precise
θJA data for a particular PCB layout
may be obtained by measuring the voltage VP-P between
SENSE+ and SENSE–, the ambient temperature TAMB, and
the die temperature TDIE, and calculating:
θJA
DIE
AMB
P P SENSE
T
V
I
=
–
-
Forevaluationofprintedcircuitboardlayoutsduringdevel-
opment,bothTAMBandTDIEtemperaturemaybemeasured
using a pin compatible LTC2942-1 internal temperature
sensor. ISENSE should be set to zero to measure TAMB,
and high enough during TDIE measurement to achieve a
significant temperature increase over TAMB.
Measuring Current
In some applications, it may be desirable to measure the
current ISENSE flowing through the internal sense resistor.
Since charge measured by the coulomb counter is the
time integral over ISENSE, differentiation of the contents
of the accumulated charge register (ACR) over time may
be used to measure average current.
Accuracyofsuchanindirectcurrentmeasurementislimited
bythebasicaccuracyofthecoulombcounter,theaccuracy
ofthetimebasewithinthehostsystem,quantizationcaused
by the prescaler setting, and time delays caused by I2C
transactions. Still, especially at higher currents, useful
resultsmaybeobtainedbyreadingtheaccumulatedcharge
register twice, with a defined time interval in between, and
dividing the charge difference by the time interval. The
time interval may be increased at low currents to limit time
quantization errors to the desired accuracy. For quicker
current measurement at low currents, prescale factor M
may be temporarily decreased, sacrificing some coulomb
count accuracy for higher current resolution.
Extending Coulomb Counter Range
To increase the range of the coulomb counter for battery
capacities higher than 5.5Ah, the host controller can either
regularlypolltheaccumulatedchargeregister(ACR)oruse
thethresholdregisterstodeterminewhentheaccumulated
charge register approaches the minimum or maximum
limits. At this point it can add or subtract a fixed charge
quantity and rewrite the result into the ACR. The added
or subtracted charge quantities can then be tracked in
software, increasing the effective ACR range.
PC Board Layout Recommendations
Keep all traces as short as possible to minimize noise and
inaccuracy. Use wider traces from the resistor to the bat-
tery, load and/or charger (see Figure 10). Put the bypass
capacitor close to SENSE+ and GND. Provide adequate
copper area on exposed pad for heat sinking.
LTC2941-1
ELECTRICALLY ISOLATED HEAT SINK
CONNECTED TO EXPOSED PAD ONLY
2941 F10
TO BATTERY
TO
CHARGER/LOAD
4
5
6
3
2
1
C
Figure 10. Recommended Layout
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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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