Overview: CN3170 is a single-cell lithium 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 battery charging applications powered by power supplies with limited current output capabilities, such as solar panels. CN3170 requires very few external components and is very suitable for portable applications. The thermal modulation circuit can control the chip temperature within a safe range when the device's power consumption is relatively large or the ambient temperature is relatively high. The internal fixed constant voltage charging voltage is 4.2V, which can also be adjusted upward through an external resistor. The charging current is set by an external resistor. When the input voltage is powered off, CN3170 automatically enters a low-power sleep mode, at which time the battery current is less than 3 microamps. Other functions include input undervoltage latch, automatic recharging, JEITA standard battery temperature monitoring, overcurrent protection during charging, and charging status/charging completion status indication. CN3170 is available in a heat-enhanced 8-pin SOP package (eSOP8).

Product Parameters

Main Functions: JEITA standard compliant lithium battery charging management chip with solar power

Operating Mode: Linear

Battery Type: Lithium-ion battery

Number of Batteries: 1

Input Voltage: 4.4V-6V

Output Voltage Range: 0V-4.2V

Maximum Charging Current: 1A

Maximum Output Current: 1A

Operating Current: 500uA

Solar Power Supply: Yes

Thermal Modulation: Yes

Package Type: eSOP8

Chip Enable: No

Built-in Power MOSFET: Yes

Applications:

l Solar emergency lights

l Beauty and skin care instruments

l Solar chargers

l Portable devices

l Various independent chargers

Features:

l The internal integrated charging current adaptive module automatically adjusts the charging current according to the current output capability of the input voltage source.

l Suitable for lithium battery charging applications powered by voltage sources with limited current output capability, such as solar panels.

l Input voltage range: 4.4V to 6V

l No external current limiting diodes and current sensing resistors are required.

l Constant voltage charging voltage 4.2V, which can also be adjusted upwards via an external resistor.

l The constant voltage charging voltage can be set to 4.35V or 4.4V via an external resistor, suitable for ternary lithium battery charging.

l Settable constant current charging current up to 1A.

l Overcurrent protection function prevents damage caused by short circuits or incorrect use of abnormally small resistors at the 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 maximizes charging current while preventing chip overheating.

l Automatically enters low-power sleep mode when the power supply voltage drops.

l Dual indicator output for charging status and charging completion status.

l Automatic recharging.

l JEITA standard compliant battery temperature monitoring function.

l Package Type: eSOP8

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