參數(shù)資料
型號(hào)： LTC4007EUFD-1#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 4A, High Efficiency, Standalone Li-Ion Battery Charger; Package: QFN; No of Pins: 24; Temperature Range: -40°C to +125°C
中文描述： BATTERY CHARGE CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PQCC24
封裝： 4 X 5 MM, LEAD FREE, PLASTIC, QFN-24
文件頁(yè)數(shù)： 10/24頁(yè)
文件大?。?/td> 269K
代理商： LTC4007EUFD-1#TRPBF
18
LTC4007-1
40071f
Adapter Limiting
An important feature of the LTC4007-1 is the ability to
automatically adjust charging current to a level which
avoids overloading the wall adapter. This allows the prod-
uct to operate at the same time that batteries are being
charged without complex load management algorithms.
Additionally, batteries will automatically be charged at the
maximum possible rate of which the adapter is capable.
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. Amplifier CL1
in Figure 8 senses the voltage across RCL, connected
between the CLP and CLN pins. When this voltage exceeds
100mV, the amplifier will override programmed charging
current to limit adapter current to 100mV/RCL. A lowpass
filter formed by 5k
and 15nF is required to eliminate
switching noise. If the current limit is not used, CLP should
be connected to CLN.
Note that the ICL pin will be asserted when the voltage
across RCL is 93mV, before the adapter limit regulation
threshold.
APPLICATIO S I FOR ATIO
WU
UU
input current limit tolerance and use that current to deter-
mine the resistor value.
RCL = 100mV/ILIM
ILIM = Adapter Min Current –
(Adapter Min Current 7%)
Table 5. Common RCL Resistor Values
ADAPTER
RCL VALUE*
RCL POWER
RATING (A)
(
) 1%
DISSIPATION (W)
RATING (W)
1.5
0.06
0.135
0.25
1.8
0.05
0.162
0.25
2
0.045
0.18
0.25
2.3
0.039
0.206
0.25
2.5
0.036
0.225
0.5
2.7
0.033
0.241
0.5
3
0.03
0.27
0.5
* 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
operation of the thermistor. The simplest of these is the
voltage divider shown in Figure 9. Unfortunately, since the
HIGH/LOW comparator thresholds are fixed internally,
there is only one thermistor type that can be used in this
network; the thermistor must have a HIGH/LOW resis-
tance ratio of 1:7. If this happy circumstance is true for
you, then simply set R9 = RTH(LOW).
Figure 9. Voltage Divider Thermistor Network
LTC4007-1
NTC
R9
7
C7
RTH
40071 F09
Setting Input Current Limit
To set the input current limit, you need to know the
minimum wall adapter current rating. Subtract 7% for the
Figure 8. Adapter Current Limiting
100mV
–
+
5k
CLP
LTC4007-1
15
CLN
16
40071 F08
15nF
+
RCL*
CIN
VIN
CL1
AC ADAPTER
INPUT
*RCL =
100mV
ADAPTER CURRENT LIMIT
+
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4008 制造商:LINER 制造商全稱:Linear Technology 功能描述:4A, High Efficiency, Standalone Li Battery Charger
LTC4008EGN 功能描述:IC BATT CHARGER CTRLR 4A 20SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
LTC4008EGN#PBF 功能描述:IC BATT CHARGER CTRLR 4A 20SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標(biāo)準(zhǔn)包裝:4,000 系列:- 功能:燃料，電量檢測(cè)計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2
LTC4008EGN#TR 功能描述:IC CTRLR CHARGR PWM CC/CV 20SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
LTC4008EGN#TRPBF 功能描述:IC BATT CHARGER CTRLR 4A 20SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
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