CN3085 Overview:
The CN3085 is a core that can charge and manage nickel-metal hydride batteries, and can charge and manage single to four nickel-metal hydride batteries. The device includes a power transistor inside and does not require external current-detecting resistors and choke diodes. The CN3085 requires very few external components and is ideal for portable products. The heat modulation circuit can control the chip temperature within the safe range when the power consumption of the device is relatively large or the ambient temperature is relatively high. The chip is integrated with a high precision voltage comparator, which can accurately set the constant current charge termination voltage.
The CN3085 charging current can be set via an external resistor. When the input voltage is off, the CN3085 automatically enters the low-power sleep mode, and the current consumption of the battery is less than 3 microamps. Other functions include low input voltage latch, trickle charge when the battery is low voltage, automatic recharge, constant current charge, maintain charge (timing), cell temperature monitoring and status indication.
The CN3085 comes in a heat-enhanced 8-pin small form factor package (SOP8/PP).
CN3085 Features:
On-chip power transistor
Voltage accuracy 1%
Trickle charging is used when the battery voltage is low
The user can set the charging current up to 1A
Constant current/constant temperature mode charging can maximize the charging current and prevent the chip from overheating
Automatically enters low-power sleep mode when the power supply voltage fails
The status indicator output can drive the LED or interface with the MCU
Maintain (timed) charging
Automatic recharge
Battery temperature monitoring function
Package form SOP8/PP
Products are lead-free, meet the rohs directive, halogen-free
CN3085 Application:
Digital camera
Electronic dictionary
Portable equipment
Application of Ni-MH battery charging
CN3085 Pin arrangement:
CN3085典型應(yīng)用電路：
CN3085訂購信息：
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器件型號 |
封裝形式 |
工作環(huán)境溫度 |
包裝 |
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CN3085 |
SOP8/PP |
-40℃ 到 85℃ |
盤裝，4000 片/盤 |
CN3085功能框圖：
CN3085管腳功能描述：
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序號
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名稱
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功能描述
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1
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TEMP
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電池溫度監(jiān)測輸入端。將TEMP管腳接到電池的NTC傳感器的輸出端。如果TEMP管腳的電壓小于輸入電壓的45%或者大于輸入電壓80%，意味著電池溫度過低或過高，則充電將被暫停，表示進(jìn)入電池故障狀態(tài)。如果TEMP在輸入電壓的45%和80%之間，則電池故障狀態(tài)將被清除，充電將繼 續(xù)。
如果將TEMP管腳接到地，電池溫度監(jiān)測功能將被禁止。
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2
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ISET
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恒流充電電流設(shè)置端。從ISET管腳連接一個電阻到地端可以對充電電流進(jìn)行設(shè)置。在涓流充電狀態(tài)，此管腳的電壓被調(diào)制在0.12V；在維持充電狀態(tài)，此管腳的電壓被調(diào)制在0.72V；在恒流充電狀態(tài)，此管腳的電壓被調(diào)制在1.205V。
恒流充電電流由下式?jīng)Q定：
ICH=1218V／RISET (A)
在涓流充電狀態(tài)，充電電流為恒流充電電流的10%。
在維持充電狀態(tài)，充電電流為恒流充電電流的60%。
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3
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GND
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電源地
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4
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VIN
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輸入電壓正輸入端。此管腳的電壓為內(nèi)部電路的工作電源。當(dāng)VIN與BAT管腳的電壓差小于10mv時，CN3085將進(jìn)入低功耗的睡眠模式，此時BAT管腳的電流小于3uA。
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5
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BAT
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電池連接端。將電池的正端連接到此管腳，BAT管腳向電池提供充電電流。 在睡眠模式，BAT管腳的電流小于3uA。
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6
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RC
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維持充電定時設(shè)置端。在恒流充電狀態(tài)，當(dāng)電池電壓達(dá)到恒流充電終止電壓時，恒流充電狀態(tài)結(jié)束，CN3085進(jìn)入維持充電狀態(tài)，并以維持電流對電池充電，維持電流為所設(shè)置恒流充電電流的60%，同時啟動維持充電定時器。當(dāng)維持充電定時結(jié)束時，整個充電過程結(jié)束，充電器進(jìn)入充電結(jié)束狀態(tài)。維持充電時間由下式?jīng)Q定：
T＝2654×R5×C1+4980×C1×103
其中， T為定時時間，單位為“秒”
R5單位為歐姆，應(yīng)在20k至5M歐姆，否則定時精度可能影響
C1單位為法拉，應(yīng)大于1nF，否則定時精度可能受影響。
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7
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CHRG
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漏極開路輸出的充電狀態(tài)指示端。當(dāng)CN3085處于涓充電狀態(tài)，恒流充電狀態(tài)和維持充電狀態(tài)時， CHRG管腳被內(nèi)部開關(guān)拉到低電平，表示充電正在進(jìn)行；否則 CHRG管腳處于高阻態(tài)。
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8
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FB
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電池電壓反饋輸入端。電池電壓通過此管腳反饋到CN3085，CN3085根據(jù) FB管腳的電壓決定充電狀態(tài)。
FB管腳電壓與電池端電壓的對應(yīng)關(guān)系為：
VBAT＝VFB×(1＋R3／R4)
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9
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EP
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散熱片。將此散熱片接地。
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