Overview: CN3156 is a single-cell lithium titanate 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. CN3156 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 internal fixed constant voltage charging voltage is 2.7V, 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, CN3156 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. CN3156 is available in a heat-enhanced 8-pin SOP package (eSOP8).

Product Parameters

Main Functions: Single-cell lithium titanate battery charging management chip that can be powered by solar panels

Operating Mode: Linear

Battery Type: Lithium Titanate Battery

Number of Batteries: 1

Input Voltage: 3.2V-6V

Output Voltage Range: 0V-2.7V

Maximum Charging Current: 1A

Maximum Output Current: 1A

Operating Current: 500uA

Solar Power Supply: Yes

Thermal Modulation: Yes

Packaging Type: eSOP8

Chip Enable: No

Built-in Power Tube: Yes

Applications:

l Medical Instruments

l Beauty and Skin Care Instruments

l Toys, Outdoor Equipment Charging, etc.

l Solar Lithium Titanate Charger

l Various Independent Chargers

Features:

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

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

l Input voltage range: 3.2V to 6V

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

l Constant voltage charging voltage 2.7V, which can also be adjusted upward through an external resistor.

l The settable continuous constant current charging current can reach 950mA.

l The overcurrent protection function of the charging current can prevent 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 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 Dual indicator output for charging status and charging completion status.

l Automatic recharging.

l Battery temperature monitoring function compliant with JEITA standards.

l Packaging Type: eSOP8

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