ME4084概述:
ME4084 is a 24V single-section lithium-ion battery constant voltage constant current charge management chip, the maximum charging current can reach 600mA (SOT23-5, FBP2*2-6L), 800mA (DFN2*2-8L), 1A(ESOP8). Because the linear charger will be seriously heated in the case of large pressure difference between the input and output, its internal thermal feedback circuit can control the chip temperature during the charging process, and adjust the charging current to a lower level to adapt to the corresponding system heat dissipation requirements. The addition of few external components makes it ideal for portable applications.
The ME4084 does not require current detection resistors or external isolation diodes for anti-backflow applications. The charging cut-off voltage is fixed at 4.2V, and the charging current can be adjusted by external resistance. When the charging current reaches 1/10 of the constant current, the ME4084 will terminate the charging.
When the input voltage (adapter or USB) is removed, the ME4084 goes into sleep mode. The charging path is automatically turned off inside the chip, and the input voltage becomes low. At this time, the battery leakage current is reduced to less than 2uA. When the ME4084 is powered and the battery is removed, the chip current is reduced to 100uA to reduce system losses.
The ME4084 also features battery temperature detection, input undervoltage locking, automatic recharging, and two charge indication pins.
ME4084特點(diǎn):
Maximum input voltage 24V, improve system reliability
Programmable charging current up to :600mA (SOT23-5, FBP2*2-6L), 800mA (DFN2*2-8L), 1A(ESOP8)
Anti-battery reverse connection protection function
Internal thermal feedback protection function, control system in a reasonable charging range
No MOSFETs, detect resistors or isolate diodes
Single section complete linear charger
Constant current and constant voltage switching
Accuracy up to ±1% of 4.2V fixed charge cut-off voltage
Automatic recharging function
Charging status dual output, no battery and fault status display
C/10 Termination of charging
Standby current 100μA
Input overvoltage protection: 6.5V
2.9V Trickle switch threshold
Soft start limits inrush current
ME4084應(yīng)用:
移動(dòng)電話(huà)
數(shù)碼相機(jī)
藍(lán)牙應(yīng)用
便攜設(shè)備
USB電源，適配器
ME4084封裝形式:
5 - pin SOT23-5
6 - pin FBP2*2-6L
8 - pin ESOP8、DFN2*2-8L
ME4084典型應(yīng)用圖:
注：輸入應(yīng)用如果需要抗24V電源熱插拔應(yīng)用，需要在輸入加上22uF以上的電解電容。
注：輸入電壓抗24V熱插拔的另外一種應(yīng)用，可以在輸入串聯(lián)一個(gè)0.4歐姆的電阻，但要注意電阻的封裝尺寸至少是1206
以上。
ME4084選購(gòu)指南:
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產(chǎn)品型號(hào)
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產(chǎn)品說(shuō)明
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ME4084AM5G
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VFLOAT =4.2V；可編程充電電流：600mA；封裝形式：SOT23-5
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ME4084AU6AG
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VFLOAT =4.2V；可編程充電電流：600mA；封裝形式：FBP2*2-6L
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ME4084BN8BG
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VFLOAT=4.2V；可編程充電電流：800mA；封裝形式：DFN2*2-8L
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ME4084BSPG
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VFLOAT =4.2V；可編程充電電流：1A；封裝形式：ESOP8
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ME4084產(chǎn)品腳位圖:
ME4084腳位說(shuō)明:
ME4084芯片功能示意圖:
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