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典型应用电路：
CN3085订购信息：
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器件型号 |
封装形式 |
工作环境温度 |
包装 |
|
CN3085 |
SOP8/PP |
-40℃ 到 85℃ |
盘装，4000 片/盘 |
CN3085功能框图：
CN3085管脚功能描述：
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序号
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名称
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功能描述
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1
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TEMP
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电池温度监测输入端。将TEMP管脚接到电池的NTC传感器的输出端。如果TEMP管脚的电压小于输入电压的45%或者大于输入电压80%，意味着电池温度过低或过高，则充电将被暂停，表示进入电池故障状态。如果TEMP在输入电压的45%和80%之间，则电池故障状态将被清除，充电将继 续。
如果将TEMP管脚接到地，电池温度监测功能将被禁止。
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2
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ISET
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恒流充电电流设置端。从ISET管脚连接一个电阻到地端可以对充电电流进行设置。在涓流充电状态，此管脚的电压被调制在0.12V；在维持充电状态，此管脚的电压被调制在0.72V；在恒流充电状态，此管脚的电压被调制在1.205V。
恒流充电电流由下式决定：
ICH=1218V／RISET (A)
在涓流充电状态，充电电流为恒流充电电流的10%。
在维持充电状态，充电电流为恒流充电电流的60%。
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3
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GND
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电源地
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4
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VIN
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输入电压正输入端。此管脚的电压为内部电路的工作电源。当VIN与BAT管脚的电压差小于10mv时，CN3085将进入低功耗的睡眠模式，此时BAT管脚的电流小于3uA。
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5
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BAT
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电池连接端。将电池的正端连接到此管脚，BAT管脚向电池提供充电电流。 在睡眠模式，BAT管脚的电流小于3uA。
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6
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RC
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维持充电定时设置端。在恒流充电状态，当电池电压达到恒流充电终止电压时，恒流充电状态结束，CN3085进入维持充电状态，并以维持电流对电池充电，维持电流为所设置恒流充电电流的60%，同时启动维持充电定时器。当维持充电定时结束时，整个充电过程结束，充电器进入充电结束状态。维持充电时间由下式决定：
T＝2654×R5×C1+4980×C1×103
其中， T为定时时间，单位为“秒”
R5单位为欧姆，应在20k至5M欧姆，否则定时精度可能影响
C1单位为法拉，应大于1nF，否则定时精度可能受影响。
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7
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CHRG
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漏极开路输出的充电状态指示端。当CN3085处于涓充电状态，恒流充电状态和维持充电状态时， CHRG管脚被内部开关拉到低电平，表示充电正在进行；否则 CHRG管脚处于高阻态。
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8
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FB
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电池电压反馈输入端。电池电压通过此管脚反馈到CN3085，CN3085根据 FB管脚的电压决定充电状态。
FB管脚电压与电池端电压的对应关系为：
VBAT＝VFB×(1＋R3／R4)
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9
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EP
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散热片。将此散热片接地。
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