Overview: CN3157 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. CN3157 requires very few external components, making it ideal for portable applications. The thermal modulation circuit can control the chip temperature at around 132℃ when the device's power consumption is high or the ambient temperature is high to avoid excessive chip temperature. The internal fixed constant voltage charging voltage is 3.63V, which can also be adjusted upward through an external resistor. The charging current is set by an external resistor. When the input voltage is cut off, CN3157 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. CN3157 is available in a heat-enhanced 8-pin SOP package (eSOP8).

Product Parameters

Main Functions: JEITA standard single-cell lithium iron phosphate battery charge management integrated circuit

Operating Mode: Linear

Battery Type: Lithium iron phosphate battery

Number of Batteries: 1

Input Voltage: 4V-6V

Output Voltage Range: 0V-3.63V

Maximum Charging Current: 950mA

Maximum Output Current: 950mA

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 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 Power supply can be provided by voltage sources with limited current output capability, such as solar panels.

l Input voltage range: 4V to 6V

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

l Constant voltage charging voltage 3.63V, which can also be adjusted upward through an external resistor.

l Settable continuous constant current charging current up to 950mA.

l Overcurrent protection function of charging current can prevent damage caused by short circuit of ISET pin or abnormal use of abnormally small resistor.

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 standard.

l Package Type: eSOP8

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