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参数资料
| 型号： | LTC4007EGN |
| 厂商： | Linear Technology |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER CTRLR 4A 24SSOP |
| 标准包装： | 55 |
| 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： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
LTC4007
APPLICATIONS INFORMATION
Adapter Limiting
An important feature of the LTC4007 is the ability to auto-
matically adjust charging current to a level which avoids
overloading the wall adapter. This allows the product to
operate at the same time that batteries are being charged
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%)
without complex load management algorithms. Addition-
ally, batteries will automatically be charged at the maximum
possible rate of which the adapter is capable.
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)
This feature is created by sensing total adapter output
current and adjusting charging current downward if a preset
adapter current limit is exceeded. True analog control is
used, with closed-loop feedback ensuring that adapter load
current remains within limits. Ampli?er CL1 in Figure 8
senses the voltage across R CL , connected between the
CLP and CLN pins. When this voltage exceeds 100mV,
1.5
1.8
2
2.3
2.5
2.7
3
0.06
0.05
0.045
0.039
0.036
0.033
0.03
0.135
0.162
0.18
0.206
0.225
0.241
0.27
0.25
0.25
0.25
0.25
0.5
0.5
0.5
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 switching
noise. If the current limit is not used, CLP and CLN should
be connected together and tied to DCIN.
Note that the I CL pin will be asserted when the voltage
across R CL is 93mV, before the adapter limit regulation
threshold.
* Values shown above are rounded to nearest standard value.
As is often the case, the wall adapter will usually have
at 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
*R CL =
LTC4007
100mV
+
– 18
CL1
+
19
100mV
ADAPTER CURRENT LIMIT
CLP
CLN
+
15nF
C IN
R CL *
5k
AC ADAPTER
INPUT
V IN
4007 F08
operation of the thermistor. The simplest of these is the
voltage divider shown in Figure 9. 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) .
Figure 8. Adapter Current Limiting
LTC4007
NTC 9
R9
Setting Input Current Limit
C7
R TH
To set the input current limit, you need to know the mini-
mum wall adapter current rating. Subtract 7% for the input
4007 F09
Figure 9. Voltage Divider Thermistor Network
4007fc
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4007EGN#PBF | 功能描述:IC BATT CHARGER CTRLR 4A 24SSOP 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 |
| LTC4007EGN#TR | 功能描述:IC CHARGER BATTERY 4A 24-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) |
| LTC4007EGN#TRPBF | 功能描述:IC BATT CHARGER CTRLR 4A 24SSOP 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) |
| LTC4007EUFD-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:4A, High Efficiency, Li-Ion Battery Charger |
| LTC4007EUFD-1#PBF | 功能描述:IC CHARGER BATTERY 4A 24-QFN 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) |
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