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參數(shù)資料
| 型號： | LM3622MX-4.2 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Lithium-Ion Battery Charger Controller |
| 中文描述： | BATTERY CHARGE CONTROLLER, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大小： | 171K |
| 代理商： | LM3622MX-4.2 |
Typical Application
The low dropout linear charger shown in Figure 2 provides
constant current and constant voltage charging of 1-cell
lithium-ion battery packs. J1 and J2 are used for selecting
the operation of the low-voltage detection. The LM3622 ini-
tializes the charge cycle based on the battery voltage and
the enable status of the low-voltage detection.
When the low-voltage detection is disabled, the LM3622
starts the charge cycle constant current mode if the battery
voltage is below the controller’s regulation level. In constant
current mode, the LM3622 modulates the base drive of Q2 to
regulate a constant 100mV across the current sense resistor
R1, thus generating charge current of
I-charge = 0.1V/R1
which is equal to 0.5A in this case.
Once the battery voltage reaches the target regulation level
set by the LM3622, Q2 is controlled to regulate the voltage
across the battery, and the constant voltage mode of the
charging cycle starts. Once the charger is in the constant
voltage mode, the charger maintains a regulated voltage
across the battery and the charging current is dependent on
the state of the charge of the battery. As the cell approaches
a fully charged condition, the charge current falls to a very
low value.
When the low-voltage detection is enabled and the initial bat-
tery voltage is below the low-voltage threshold, the LM3622
turns Q2 off and forces the LV pin low to drive Q1 on to start
a wake up charge phase. Q1 in conjunction with R2 provides
a low current source to recondition the battery. During the
wake up charge mode, Q1 is driven into saturation and the
wake up charge current is programmed by R2,
I-charge (wake) = (V
IN
– V
CE
1 – V
D
1 – LVth)/R2
where V
is the input supply voltage, V
1 is the
collector-emitter on state voltage of Q1, V
1 is the diode for-
ward voltage of D1, and LVth is the low-voltage threshold
level set by switch J2.
Once the battery voltage reaches the low-voltage threshold,
the LV pin transitions to a high-impedance state to end the
wake up charge phase, and the EXT pin resumes the base
drive of Q2 to start the constant current mode. The charging
cycle is completed in constant voltage mode when the bat-
tery is fully charged. Figure 3 shows the timing diagram of
the charge cycle with the low-voltage detection enabled.
D1 is a general-purpose silicon diode used for isolating the
battery from the charger circuitry that could discharge the
battery when the input source is removed. Changing D1 to a
Schottky diode will reduce the overall dropout voltage of the
circuit, but the penalty is higher leakage current associated
with Schottky diodes.
DS100974-13
FIGURE 2. Low Dropout, Constant Current/Constant Voltage Li-ion Battery Charger
L
www.national.com
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM3622MX-8.1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Battery Management |
| LM3622MX-8.2 | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| LM3622MX-8.2/NOPB | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| LM3622MX-8.4 | 功能描述:IC CTRLR LI-ION BATT CHRG 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:1 系列:- 功能:充電管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
| LM36274EVM | 功能描述:LM36274 4, Non-Isolated Output LED Driver Evaluation Board 制造商:texas instruments 系列:- 零件狀態(tài):有效 電流 - 輸出/通道:- 輸出和類型:4，非隔離 電壓 - 輸出:- 特性:- 電壓 - 輸入:2.7 V ~ 5 V 所含物品:板 使用的 IC/零件:LM36274 標準包裝:1 |
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