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| 型号： | LTC4150CMS#TR |
| 厂商： | Linear Technology |
| 文件页数： | 8/14页 |
| 文件大小： | 0K |
| 描述： | IC COUNTER/BATT GAS GAUGE 10MSOP |
| 标准包装： | 2,500 |
| 功能： | 燃料，电量检测计/监控器 |
| 电池化学： | 锂离子，镍镉，镍氢 |
| 电源电压： | 2.7 V ~ 8.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (TR) |
LTC4150
APPLICATIONS INFORMATION
SENSE VOLTAGE INPUT AND FILTERS
Since the overall integration time is set by internally trim-
ming the LTC4150, no external timing capacitor or trimming
is necessary. The only external component that affects
the transfer function of interrupts per coulomb of charge
Coulomb Counting
The LTC4150’s transfer function is quanti?ed as a volt-
age to frequency gain G VF , where output frequency is the
number of interrupts per second and input voltage is the
differential drive V SENSE across SENSE + and SENSE – . The
is the sense resistor, R SENSE . The common mode range
for the SENSE + and SENSE – pins is V DD ±60mV, with a
maximum differential voltage range of ±50mV. SENSE + is
normally tied to V DD , so there is no common mode issue
when SENSE – operates within the 50mV differential limit
relative to SENSE + .
Choose R SENSE to provide 50mV drop at maximum charge
or discharge current, whichever is greater. Calculate
number of interrupts per second will be:
f = G VF ? ? V SENSE ?
where
V SENSE = I BATTERY ? R SENSE
Therefore,
f = G VF ? ? I BATTERY ? R SENSE ?
(2)
(3)
(4)
R SENSE from:
Since I ? t = Q, coulombs of battery charge per INT pulse
50mV
R SENSE = (1)
I MAX
The sense input range is small (±50mV) to minimize the
can be derived from Equation 4:
1
One INT = Coulombs
G VF ? R SENSE
(5)
loss across R SENSE . To preserve accuracy, use Kelvin
connections at R SENSE .
Battery capacity is most often expressed in ampere-
hours.
The external ?lter capacitor, C F , operates against a total
on-chip resistance of 4k to form a lowpass ?lter that
averages battery current and improves accuracy in the
1Ah = 3600 Coulombs
Combining Equations 5 and 6:
(6)
3600 ? G VF SENSE
presence of noise, spikes and ripple. 4.7μF is recom-
mended for general applications but can be extended to
higher values as long as the capacitor’s leakage is low.
One INT =
1
? R
[Ah]
(7)
A 10nA leakage is roughly equivalent to the input offset
or
error of the integrator. Ceramic capacitors are suitable
for this use.
1Ah = 3600 ? G VF ? R SENSE Interrupts
(8)
Switching regulators are a particular concern because
they generate high levels of current ripple which may ?ow
through the battery. The V DD and SENSE + connection to
the charger and load should be bypassed by at least 4.7μF
at the LTC4150 if a switching regulator is present.
The LTC4150 maintains high accuracy even when Burst
Mode ? switching regulators are used. Burst pulse “on”
levels must be within the speci?ed differential input volt-
age range of 50mV as measured at C F+ and C F – . To retain
accurate charge information, the LTC4150 must remain
enabled during Burst Mode operation. If the LTC4150
shuts down or V DD drops below 2.5V, the part resets and
The charge measurement may be further scaled within
the microcontroller. However, the number of interrupts,
coulombs or Ah all represent battery charge.
The LTC4150’s transfer function is set only by the value
of the sense resistor and the gain G VF . Once R SENSE is
selected using Equation 1, the charge per interrupt can
be determined from Equation 5 or 7.
Note that R SENSE is not chosen to set the relationship
between ampere-hours of battery charge and number of
interrupts issued by the LTC4150. Rather, R SENSE is chosen
to keep the maximum sense voltage equal to or less than
the LTC4150’s 50mV full-scale sense input.
charge information is lost.
4150fc
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4150CMSTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Coulomb Counter/ Battery Gas Gauge |
| LTC4150IMS | 功能描述:IC COUNTER/GAUGE BATTERY 10MSOP RoHS:否 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 |
| LTC4150IMS#PBF | 功能描述:IC COUNTER/GAUGE GAS/BATT 10MSOP 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 |
| LTC4150IMS#TR | 功能描述:IC COUNTER/GAUGE BATTERY 10MSOP RoHS:否 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 |
| LTC4150IMS#TRPBF | 功能描述:IC COUNTER/GAUGE GAS/BATT 10MSOP 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 |
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