Overview: CN3795 is a PWM buck multi-cell battery charge management integrated circuit that can be powered by solar panels. It independently manages the charging of multiple battery cells and features a small package size, few external components, and ease of use. CN3795 has trickle, constant current, and constant voltage charging modes, making it ideal for lithium batteries, lithium iron phosphate batteries, and lithium titanate batteries. In constant voltage charging mode, CN3795 regulates the battery voltage to the voltage set by the external feedback resistor; in constant current charging mode, the charging current is set by an external resistor. When powered by a solar panel, the internal circuit automatically tracks the maximum power point of the solar panel. Users do not need to consider worst-case scenarios and can maximize the use of the solar panel's output power, making it ideal for solar-powered applications. For deeply discharged lithium batteries, when the battery voltage is below 66.5% (typical value) of the constant voltage charging voltage, CN3795 performs trickle charging with 17.5% of the set constant current charging current. In the constant voltage charging stage, the charging current gradually decreases, and when the charging current decreases to 16% of the constant current charging current, the charging ends. In the charging completion state, if the charging current rises above 58.8% of the constant current charging current, a new charging cycle automatically begins. When the input power is cut off or the input voltage is lower than the battery voltage, CN3795 automatically enters sleep mode. Other functions include input undervoltage latch, battery overvoltage protection, and charging status indication. CN3795 is available in a 10-pin SSOP package.

Product Parameters

Key Features: PWM buck mode multi-cell battery charge management integrated circuit powered by solar panel, independently manages multi-cell battery charging

Operating Mode: Switching

Battery Type: Single-cell or multi-cell lithium batteries, LiFePO4 batteries, or Li-ion titanate batteries

Output Voltage Range: 0V-25V

Input Voltage Range: 6.6V-30V

Maximum Charging Current: 4A

Operating Current: 1mA

Solar Power Supply: Yes

Thermal Modulation: No

Package Type: SSOP10

Switching Frequency: 330kHz

Built-in Power Transistor: No

Applications ：

l Handheld devices

l Emergency lights

l Backup battery applications

l Portable industrial and medical instruments

l Power tools

l Charging for lithium batteries, LiFePO4 batteries, and Li-ion titanate batteries

Features ：

l Solar panel maximum power point tracking function

l Complete charge management for single-cell or multi-cell lithium batteries, LiFePO4 batteries, or Li-ion titanate batteries

l Wide input voltage range: 6.6V to 30V

l Can be used as a constant voltage source when the battery is not connected

l Charging current up to 4A

l PWM switching frequency: 310KHz

l Constant voltage charging voltage set by external resistor

l Constant current charging current set by external resistor

l Trickle charging for deeply discharged batteries

l Automatic recharge function

l Charge status indication

l Soft-start function

l Battery terminal overvoltage protection

l Operating ambient temperature: -40°C to +85°C

l Adopts 10-pin SSOP package

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