參數(shù)資料
型號(hào)： LM3621M-3.0X
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： BATTERY CHARGE CONTROLLER, PDSO16
封裝： SOIC-16
文件頁(yè)數(shù)： 3/15頁(yè)
文件大小： 377K
代理商： LM3621M-3.0X
Application Information
BATTERY CHARGER OPERATION INFORMATION
Figure 4 shows a general battery charger configuration using
LM3621. The LM3621 provides all the necessary control
functions for charging Lithium-Ion batteries precisely and
safely. It features constant voltage and constant current
mode operation. The on chip timer provides all critical timing
functions to properly initialize the charging cycle, avoid over
charging the battery above its maximum capacity level, and
cut off charging to a defective battery. The LM3621 also
provides the high accuracy of output voltage regulation with-
out requiring a trim pot or precision resistors. A built-in power
down switch prevents the battery from discharging through
the LM3621.
INPUT SUPPLY VOLTAGE
The voltage supply to LM3621 must never exceed 6.0V or
catastrophic damage may occur to the IC. When power is
first applied to the battery charger, the LM3621 will remain in
a reset state until the voltage on the V
DD pin exceeds 3.4V
for at least one second. This ensures that the power source
is stable before a charge cycle is initiated. Figure 2 shows
the state diagram for the charge cycle operation. Once the
LM3621 emerges from the reset state after power up, it will
not go into the reset state again until the voltage on the V
DD
pin drops below approximately 2.2V. When the LM3621 is in
the reset state, the PFD (Pass FET Drive) pin is pulled low
so that current is not allowed to flow into the load (e.g., Li+
battery). The LM3621 transitions from the reset state to
standby mode when the conditions for a stable power source
are met.
DIGITAL CONTROL INPUTS
The LM3621 has four digital input control pins: Enable,
Boost, V
SET and ChgInt. To ensure proper operation, never
allow unused digital input pins to be left open circuited.
Enable is used to initiate a charge cycle, Boost is used to
increase the maximum regulation current output, V
SET con-
trols the maximum output voltage, and ChgInt is used to
instantaneously interrupt (and resume) a charge cycle in
progress.
CURRENT BOOST MODE
This mode is activated when the “Boost” pin is pulled high.
The charger increases the maximum output current equal to
aV
CSR level of 0.9V. This mode of operation is overridden by
a charge interrupt signal.
10010704
FIGURE 4. General Application Circuit
LM3621
www.national.com
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相關(guān)PDF資料
PDF描述
LM3621MX-3.0 BATTERY CHARGE CONTROLLER, PDSO16
LM3647M POWER SUPPLY MANAGEMENT CKT, PDSO8
LM385BDR-1-2E4 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.235 V, PDSO8
LM385PW-2-5 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PDSO8
LM385BPW-2-5 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM3621MX 功能描述:IC CTRLR LI-ION BAT CHRG 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:充電管理 電池化學(xué):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(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁(yè)面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT
LM3621MX/NOPB 制造商:Texas Instruments 功能描述:Charge Controller Li-Ion 20mA 4.1V/4.2V 16-Pin SOIC N T/R
LM3622 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Lithium-Ion Battery Charger Controller
LM3622AM-4.1 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Lithium-Ion Battery Charger Controller
LM3622AM-4.1/NOPB 功能描述:IC CTRLR LI-ION BAT CHRG 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:充電管理 電池化學(xué):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(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁(yè)面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT
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