QNHCHIP QN4056H

The QN4056H series is a linear single-cell lithium-ion battery charger IC featuring a maximum input voltage rating of 33V, input overvoltage protection, and a maximum charge current of 1.2A, employing trickle, constant-current, and constant-voltage charging modes. The charge voltage is set to 4.2V or 4.35V, and the charge current is programmable via an external resistor. When the battery voltage reaches 4.2V or 4.35V, the charge current drops to C/5 or C/10 of the programmed value, at which point the IC terminates charging and enters standby mode. Upon removal of the power supply, the IC automatically enters a low-power standby state. The CE, TS, CHRG, and STDBY pins are also rated for high-voltage operation. This IC is suitable for use with USB power sources and adapter supplies, and employs an internal PMOSFET architecture with reverse-charge protection, eliminating the need for external sense resistors and blocking diodes.

• Recommended operating voltage: 4.5V ~ 5.5V
• Maximum input voltage rating: 32V
• Hot-plug support at 28V (RC snubber on input)
• Overvoltage protection threshold: 6.8V (typical)
• Up to 1.2A programmable charge current
• 4.20V preset charge voltage with ±1% accuracy
• No external MOSFET, sense resistor, or isolation diode required
• Constant current / constant voltage operation
• Charge status, charge termination, battery absent, and fault status indication
• Standby quiescent current: 1.0μA (typical)
• 0V battery charge activation
• BAT pin battery reverse-polarity protection
• 2.9V trickle charge; C/5 or C/10 charge termination
• Automatic recharge
• Soft-start inrush current limiting
• Charge current derating begins at junction temperature 130°C; charging disabled at 155°C
• Operating temperature range: -40°C ~ 105°C
• Package: ESOP-8

• Portable devices such as digital cameras, mini audio systems, and electronic toys
• Various chargers for hair clippers, electric shavers, etc.
• Bluetooth headsets, GPS, wearable devices
• Massage guns, e-cigarettes