- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄358848 > LM3622MX-8.4 (NATIONAL SEMICONDUCTOR CORP) Lithium-Ion Battery Charger Controller PDF資料下載
參數(shù)資料
| 型號(hào)： | LM3622MX-8.4 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 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(yè)數(shù)： | 6/9頁(yè) |
| 文件大?。?/td> | 171K |
| 代理商： | LM3622MX-8.4 |
Functional Description
The simplified LM3622 block diagram in Figure 1 gives a
general idea of the circuit operation. The controller integrates
the reference, feedback and drive functions on-chip to con-
trol a linear, lithium-ion battery charger in constant voltage
and constant current (CVCC) charge operation. The regu-
lated output voltage is sensed between CEL and CS, and the
battery charge current is sensed across a current-sense re-
sistor between CS and GND. The EXT pin is designed for
driving a series pass element, which can be a PNP transistor
or a P-MOSFET.
Tying the LV
pin to ground enables the controller’s
low-voltage detection circuit. When the low-voltage detection
circuit is enabled and a battery voltage below a preset
threshold is detected, the LM3622 will drive the LV pin low
and shut off the current flowing into the EXT pin to suspend
the CVCC charge process. The low-voltage threshold is user
selectable to be either 2.15V/cell or 2.7V/cell by pulling the
LV
SEL
pin to GND or V
CC
respectively. The LV pin is a NPN
open collector output that can be used to turn on a low cur-
rent source to wake up charge a deeply depleted battery.
When the low-voltage detection is disabled (LV
pulled up
to V
), the LM3622 always starts the charge cycle in con-
stant current mode at any battery voltage below the control-
ler’s regulation level, and maintains the LV pin at a
high-impedance state.
Application Information
CEL Pin Current Drain
The LM3622 has an internal power down switch in series
with the on-chip resistor divider that is used for sensing the
battery voltage. In the event that the V
CC
supply is removed,
the power down switch will disconnect the resistor divider
from the CS pin, preventing the battery from discharging
through the CEL pin.
EXT Pin
The EXT pin is internally pulled up to V
via a 20μA current
source
making
it
possible
base-emitter resistor when driving a PNP transistor, or the
gate-source resistor when driving a P-MOSFET. However,
the voltage applied to EXT is not allowed to be higher than
(V
CC
+ 0.3V), otherwise the reverse current from EXT pin to
V
CC
pin may cause damage to the device.
to
eliminate
the
external
LV Pin Current Rating
The LV pin is a low power, NPN open collector output that is
rated to sink 10mAmaximum. Therefore, the value of the pull
up resistor should be chosen high enough to limit the current
to be less than 10mA.
CS Pin
In normal operation, the current limit threshold voltage for
the CS pin is 100mV typical. In case of a fault condition, the
voltage to this pin should be limited to below 5V.
DS100974-11
FIGURE 1. LM3622 Simplified Block Diagram
L
www.national.com
6
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM363H-500 | LM363 Precision Instrumentation Amplifier |
| LM363D | Instrumentation Amp， Fixed Gain |
| LM363H-10 | LM363 Precision Instrumentation Amplifier |
| LM363H-100 | LM363 Precision Instrumentation Amplifier |
| LM363 | LM363 Precision Instrumentation Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(lèi)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(biāo)準(zhǔn)包裝:1 |
| LM363 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:LM363 Precision Instrumentation Amplifier |
| LM3630A | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:LM3630A High-Efficiency Dual-String White LED Driver |
| LM3630ATME | 制造商:Texas Instruments 功能描述:LED DRVR 20Segment 2.5V/3.3V/5V 12-Pin DSBGA T/R 制造商:Texas Instruments 功能描述:IC LED DRIVER 2-STRING 12DSBGA 制造商:Texas Instruments 功能描述:Hi Eff Dual-String White LED Dvr |
| LM3630ATMX | 制造商:Texas Instruments 功能描述:IC LED DRIVER 2-STRING 12DSBGA 制造商:Texas Instruments 功能描述:LED BACKLIGHT DRIVER 制造商:Texas Instruments 功能描述:LINEAR IC |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。