Product parameters

Funtion：PFM Step-up 2-cell Lithium Battery Charger IC

Opration Mode：Switch

Battery：Lithium-ion

Battery No.：2

Vout Range：0V-8.4V

Vin Range：2.75V - 6.5V

Operating Current：280uA@VIN=5V

Solar Panel charge：Yes

Chip Temperature Regulation：Yes

Package：QFN12

Chip Enable：Yes

On-chip Power MOSFET：Yes

General Description：

CN3392 is a PFM mode step-up battery charge management IC with operating voltage range between 2.75V to 6.5V. It is specially designed for 2-cell lithium battery charge management with fewer external components. CN3392 adopts constant current and quasi-constant voltage(Quasi-CV^TM) mode to charge battery.

On power up, CN3392 enters charging state, the on-chip N-channel MOSFET is turned on, inductor current rises. When inductor current reaches upper threshold, the N-channel MOSFET is turned off, inductor is discharged, the energy stored in inductor is transferred to battery. When the inductor current is discharged to its lower threshold, the N-channel MOSFET is turned on again. When BAT pin voltage reaches 8.4V(Typ.) for the first time, CN3392 enters quasi-CV mode, in which the charge current is reduced. The charge process will not be terminated until BAT voltage reaches 8.4V again. In termination mode, When BAT voltage falls below recharge threshold, the CN3392 enters charge mode again. CN3392’s switching frequency can be up to 1MHz, which makes a small-profile inductor usable.

If battery voltage is lower than input voltage by a diode drop, CN3392 will increase the off time to reduce the charge current as a protection for  battery with the joint action of internal N-channel and P-channel MOSFET.

The other features include chip enable input, chip over temperature protection, current sense resistor short-circuit protection and status indication, etc.

CN3392 is available in 3mmⅹ3mm 12-pin DFN package.

Applications:

l  2-cell Li+ Battery Charging Management

l  Power Bank, POS, Electric Fan

l  Audio System

l  Standalone Charger

Features：

l  Input Voltage Range：2.75V to 6.5V

l  Operating Current：280uA@VIN=5V

l  Can be Powered by Solar-panel

l  Inductor Current Detection

l  On-chip N-Channel MOSFET

l  Switching Frequency up to 1MHz

l  Quasi-CV mode to Compensate for the Voltage Loss on Battery Internal Resistance and Trace Resistance

l  Short-circuit Protection for Current Sense Resistor

l  Automatic Recharge

l  Output Power up to 35W

l  Protection for Low Battery Voltage and Short Battery

l  Automatic Adaptability to Input Supply with Limited Driving Capability

l  Chip Enable Input

l  Chip Over Temperature Protection

l  Battery Overvoltage Protection

l  Status Indication

l  Operating Temperature ：－40℃ to 85℃

l  Available in SOP8 Package

l  Lead-free, rohs-Compliant and Halogen Free