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| 型号： | LTC4006EGN-2#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATTERY 4A 16-SSOP |
| 标准包装： | 100 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 6 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
LTC4006
APPLICATIO S I FOR ATIO
LTC4006
NTC 6
R9
LTC4006
NTC 6
R9
C7
R TH
C7
R9A
R TH
4006 F10
Figure 10. Voltage Divider Thermistor Network
you, then simply set R9 = R TH(LOW)
If you are using a thermistor that doesn’t have a 1:7 HIGH/
LOW ratio, or you wish to set the HIGH/LOW limits to
different temperatures, then the more generic network in
Figure 11 should work.
Once the thermistor, R TH , has been selected and the
thermistor value is known at the temperature limits, then
resistors R9 and R9A are given by:
For NTC thermistors:
R9 = 6 R TH(LOW) ? R TH(HIGH) /(R TH(LOW) – R TH(HIGH) )
R9A = 6 R TH(LOW) ? R TH(HIGH) /(R TH(LOW) – 7 ? R TH(HIGH) )
where R TH(LOW) > 7 ? R TH(HIGH)
For PTC thermistors:
R9 = 6 R TH(LOW) ? R TH(HIGH) /(R TH(HIGH) – R TH(LOW) )
R9A = 6 R TH(LOW) ? R TH(HIGH) /(R TH(HIGH) – 7 ? R TH(LOW) )
where R TH(HIGH) > 7R TH(LOW)
Example #1: 10k ? NTC with custom limits
TLOW = 0 ° C, THIGH = 50 ° C
R TH = 10k at 25 ° C,
R TH(LOW) = 32.582k at 0 ° C
R TH(HIGH) = 3.635k at 50 ° C
R9 = 24.55k → 24.3k (nearest 1% value)
R9A = 99.6k → 100k (nearest 1% value)
Example #2: 100k ? NTC
TLOW = 5 ° C, THIGH = 50 ° C
R TH = 100k at 25 ° C,
R TH(LOW) = 272.05k at 5 ° C
R TH(HIGH) = 33.195k at 50 ° C
R9 = 226.9k → 226k (nearest 1% value)
R9A = 1.365M → 1.37M (nearest 1% value)
Example #3: 22k ? PTC
TLOW = 0 ° C, THIGH = 50 ° C
4006 F11
Figure 11. General Thermistor Network
R TH = 22k at 25 ° C,
R TH(LOW) = 6.53k at 0 ° C
R TH(HIGH) = 61.4k at 50 ° C
R9 = 43.9k → 44.2k (nearest 1% value)
R9A = 154k
Sizing the Thermistor Hold Capacitor
During the hold interval, C7 must hold the voltage across
the thermistor relatively constant to avoid false readings.
A reasonable amount of ripple on NTC during the hold
interval is about 10mV to 15mV. Therefore, the value of C7
is given by:
C7 = t HOLD /(R9/7 ? –ln(1 – 8 ? 15mV/4.5V))
= 10 ? R RT ? 17.5pF/(R9/7 ? – ln(1 – 8 ? 15mV/4.5V)
Example:
R9 = 24.3k
R RT = 309k (~2 hour timer)
C7 = 0.57 μ F → 0.56 μ F (nearest value)
Disabling the Thermistor Function
If the thermistor is not needed, connecting a resistor
between DCIN and NTC will disable it. The resistor should
be sized to provide at least 10 μ A with the minimum voltage
applied to DCIN and 10V at NTC. Do not exceed 30 μ A into
NTC. Generally, a 301k resistor will work for DCIN less
than 15V. A 499k resistor is recommended for DCIN
between 15V and 24V.
Optional Simple Battery Discharge Path Circuit
It is NOT recommended that one permit battery current to
flow backwards through R SENSE , inductor and out the
TGATE MOSFET internal diode to reach V OUT . The TGATE
MOSFET is off when V IN < V BAT . Figure 12 shows an op-
tional high efficiency discharge path for the battery such that
V OUT power comes from lossless “diode or” of V IN and V BAT .
Normally when V IN > V BAT , P-channel MOSFET Q1B V GS =
4006fa
16
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相关代理商/技术参数 |
参数描述 |
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| LTC4006EGN-4 | 功能描述:IC CHARGER BATTERY 4A 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC4006EGN-4#PBF | 功能描述:IC CHARGER BATTERY 4A 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:2,000 系列:Impedance Track™ 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:2.4 V ~ 2.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:带卷 (TR) 产品目录页面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名称:296-21665-2 |
| LTC4006EGN-4#TR | 功能描述:IC BATT CHGR CC/CV LI-ION 16SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC4006EGN-4#TRPBF | 功能描述:IC CHARGER BATTERY 4A 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC4006EGN-6 | 功能描述:IC CHARGER BATTERY 4A 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
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