Overview: CN3136 is a single-cell lithium iron phosphate battery charge management chip that can be powered by solar energy. The device includes power transistors internally and does not require external current detection resistors and current limiting diodes. The internal adaptive charging current module can automatically adjust the charging current according to the current output capability of the input power supply. Users do not need to consider the worst-case scenario, and can maximize the use of the current output capability of the input power supply. It is very suitable for lithium iron phosphate battery charging applications powered by power supplies with limited current output capabilities, such as solar panels. CN3136 requires very few external components and is very suitable for portable applications. The thermal modulation circuit can control the chip temperature at around 132℃ when the device's power consumption is relatively large or the ambient temperature is relatively high to avoid excessive chip temperature. The charging current is set by an external resistor, and the minimum constant current charging current can be set as low as 3 mA, which is very suitable for charging small-capacity batteries. When the input voltage is cut off, CN3136 automatically enters a low-power sleep mode, and the battery current is less than 3 μA at this time. Other functions include input undervoltage latch, automatic recharging, JEITA standard battery temperature monitoring, overcurrent protection during charging, and charging status indication. CN3136 is packaged in a 6-pin SOT23 package.

Product Parameters

Main Functions: 400mAh single-cell lithium battery charging management integrated circuit with solar power

Operating Mode: Linear

Battery Type: Lithium iron phosphate battery

Number of Batteries: 1

Input Voltage: 3.9V-6V

Output Voltage Range: 0V-3.6V

Maximum Charging Current: 400mA

Maximum Output Current: 400mA

Operating Current: 390uA

Solar Power: Yes

Thermal Modulation: Yes

Package Type: SOT23-6

Chip Enable: No

Built-in Power MOSFET: Yes

Applications:

l Medical instruments

l Beauty and skincare instruments

l Solar chargers

l Portable devices

l Various independent chargers

Features:

l Input voltage range: 3.9V to 6V

l Internally integrated charging current adaptive module, which can automatically adjust the charging current according to the current output capability of the input voltage source

l Can be powered by voltage sources with limited current output capability, such as solar panels

l Constant voltage charging voltage: 3.63V ±1%

l Settable continuous constant current charging current up to 400mA

l Settable minimum constant current charging current as low as 3mA

l Overcurrent protection function for charging current can prevent damage caused by short circuit or misuse of abnormally small resistance at ISET pin

l Can be used as a voltage source

l Internal soft-start circuit

l Trickle charging mode is used when the battery voltage is low to activate deeply discharged batteries and reduce power consumption

l Constant current/constant voltage/constant temperature charging mode is used to maximize charging current and prevent chip overheating

l Automatically enters low-power sleep mode when the power supply voltage is cut off

l Status indication output

l Automatic recharging

l Battery temperature monitoring function compliant with JEITA standard

l Package type: SOT23-6

l Lead-free product, RoHS compliant, halogen-free