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参数资料
| 型号： | LTC4008EGN |
| 厂商： | Linear Technology |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER CTRLR 4A 20SSOP |
| 标准包装： | 55 |
| 功能： | 充电管理 |
| 电池化学： | 多化学 |
| 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： | 20-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 管件 |
LTC4008
APPLICATIONS INFORMATION
used, with closed-loop feedback ensuring that adapter load
current remains within limits. Ampli?er CL1 in Figure 7
senses the voltage across R CL , connected between the
CLP and CLN pins. When this voltage exceeds 100mV,
LTC4008
NTC 8
R9
C7
R TH
the ampli?er will override programmed charging current
to limit adapter current to 100mV/R CL . A lowpass ?lter
formed by 5kΩ and 15nF is required to eliminate switch-
4008 F08
Figure 8. Voltage Divider Thermistor Network
ing noise. If the current limit is not used, CLN should be
connected to CLP.
Note that the I CL pin will be asserted when the voltage
Table 5. Common R CL Resistor Values
ADAPTER R CL VALUE* R CL POWER
RATING (A) (Ω) 1% DISSIPATION (W)
R CL POWER
RATING (W)
across R CL is 93mV, before the adapter limit regulation
threshold.
1.5
1.8
0.06
0.05
0.135
0.162
0.25
0.25
LTC4008
CL1
–
+
100mV
16
15
CLP
CLN
V IN
R CL *
15nF
5k
+
C IN
TO
SYSTEM
LOAD
2
2.3
2.5
2.7
3
0.045
0.039
0.036
0.033
0.03
0.18
0.206
0.225
0.241
0.27
0.25
0.25
0.5
0.5
0.5
4008 F07
*Values shown above are rounded to nearest standard value.
*R CL =
100mV
ADAPTER CURRENT LIMIT
As is often the case, the wall adapter will usually have at
Figure 7. Adapter Current Limiting
Setting Input Current Limit
To set the input current limit, you need to know the mini-
mum wall adapter current rating. Subtract 7% for the input
current limit tolerance and use that current to determine
the resistor value.
R CL = 100mV/I LIM
I LIM = Adapter Min Current –
(Adapter Min Current ? 7%)
least a +10% current limit margin and many times one
can simply set the adapter current limit value to the actual
adapter rating (see Table 5).
Designing the Thermistor Network
There are several networks that will yield the desired
function of voltage vs temperature needed for proper
operation of the thermistor. The simplest of these is the
voltage divider shown in Figure 8. Unfortunately, since
the HIGH/LOW comparator thresholds are ?xed internally,
there is only one thermistor type that can be used in this
network; the thermistor must have a HIGH/LOW resistance
ratio of 1:7. If this happy circumstance is true for you, then
simply set R9 = R TH(LOW)
4008fb
17
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|---|---|
| LTC4008EGN#PBF | 功能描述:IC BATT CHARGER CTRLR 4A 20SSOP 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 |
| LTC4008EGN#TR | 功能描述:IC CTRLR CHARGR PWM CC/CV 20SSOP 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) |
| LTC4008EGN#TRPBF | 功能描述:IC BATT CHARGER CTRLR 4A 20SSOP 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) |
| LTC4008EGN-1 | 功能描述:IC BATT CHARGER CTRLR 4A 20SSOP 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) |
| LTC4008EGN-1#PBF | 功能描述:IC BATT CHARGER CTRLR 4A 20SSOP 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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