Overview: CN3392 is a PFM boost type dual-cell lithium battery charge control integrated circuit operating at 2.75V to 6.5V. CN3392 uses constant current and quasi-constant voltage mode (Quasi-CVTM) to manage battery charging. It integrates a reference voltage source, inductor current detection unit, battery voltage detection circuit, and on-chip MOSFET, etc., featuring few external components and simple circuitry. When the input power is connected, CN3392 enters the charging state, controlling the on-chip N-channel MOSFET to turn on, and the inductor current rises. When it rises to the upper limit set by the external current detection resistor, the on-chip N-channel MOSFET turns off, and the inductor current decreases, transferring the energy in the inductor to the battery. When the inductor current drops to the lower limit set by the external current detection resistor, the on-chip N-channel MOSFET turns on again, and this cycle repeats. When the BAT pin voltage first reaches the internally set 8.4V (typical value), CN3392 enters quasi-constant voltage charging mode and charges the battery with a smaller current. In quasi-constant voltage mode, when the BAT pin voltage reaches 8.4V, the charging process ends, and the on-chip N-channel MOSFET remains off. When the BAT pin voltage drops to the recharge threshold, CN3392 enters the charging state again. The maximum operating frequency of CN3392 can reach 1MHz. When the battery voltage is lower than the input voltage or the battery is short-circuited, CN3392 continues to charge the battery with a smaller current under the combined action of the on-chip N-channel MOSFET and the external P-channel MOSFET, protecting the battery. Other functions include chip enable input, chip over-temperature protection, current detection resistor short-circuit protection, and status indication output. CN3392 uses a 3mm x 3mm 12-pin DFN package.

Product Parameters

Main Functions: PFM boost type two-cell lithium battery charging control integrated circuit

Operating Mode: Switching

Battery Type: Lithium-ion battery

Number of Batteries: 2

Output Voltage Range: 0-8.4V

Input Voltage Range: 2.75V-6.5V

Operating Current: 280uA

Solar Power Supply: Yes

Thermal Modulation: Yes

Packaging Type: QFN12

Maximum Output Power: 35W

Switching Frequency: Less than 1M

Built-in Power Tube: Yes

Applications:

l Two-cell lithium battery charging control

l POS machine, electric fan

l Audio

l Independent charger

Features:

l Input voltage range: 2.75V to 6.5V

l Operating current: 280μA @VIN=5V

l Adaptive input power supply function

l Supports solar power supply

l Built-in N-channel MOSFET

l Inductor current detection

l Up to 1MHz switching frequency

l Quasi-constant voltage charging mode compensates for voltage loss caused by battery internal resistance and battery connection line resistance

l Current detection resistor short-circuit protection

l Automatic recharging function

l Up to 35W output power

l When the battery voltage is lower than the input voltage or the battery is short-circuited, charge at a lower current.

l Chip enable input

l Chip over-temperature protection

l Battery over-voltage protection

l Status indication output

l Operating temperature range: -40°C to 85°C

l 12-pin DFN package (3mmx.3mm)

l Lead-free product, meets RoHS directive requirements, halogen-free