CN3791

The CN3791 is a solar charge controller IC. Equivalent alternatives include:
- BQ24650 (TI)
- LT3652 (Analog Devices)
- MPPT-1210 (Microchip)
- SPV1040 (STMicroelectronics)
These chips offer similar MPPT or PWM charging functionality for solar applications. Check datasheets for exact compatibility.

The CN3791 is a 16-pin (SOP-16) PWM/PFM step-down battery charging controller IC. Key functions include:
- Input Voltage Range: 4.5V to 28V
- Charging Current: Adjustable up to 4A
- Battery Compatibility: Supports Li-ion/LiFePO4/Pb-acid (adjustable voltage)
- Charging Modes: PWM/PFM for efficiency
- Protections: Over-voltage, over-current, and thermal shutdown
- Control Pins: PROG (current setting), BAT (battery voltage sense), STAT (status indicator)
Pins include power inputs (VIN, GND), battery connection (BAT), charging control (PROG, CE), and status output (STAT).

The CN3791 is a battery charge management controller IC manufactured by ConvenientPower, a Chinese semiconductor company specializing in power management solutions. ConvenientPower focuses on designing and producing integrated circuits for battery charging, power management, and LED driver applications. The company is known for providing cost-effective and reliable solutions, primarily targeting consumer electronics, portable devices, and industrial applications. The CN3791, in particular, is designed for single-cell lithium-ion/polymer battery charging, offering features like constant current/constant voltage regulation and thermal protection. ConvenientPower operates mainly in the domestic Chinese market but also serves international customers.

The CN3791 is a solar charge controller IC primarily used in:
1. Solar Power Systems – For charging lithium-ion, lithium iron phosphate (LiFePO4), and lead-acid batteries.
2. Portable Solar Chargers – Powering small devices like solar-powered lights, fans, and mobile chargers.
3. Off-Grid Applications – Supporting renewable energy setups in remote areas.
4. Battery-Powered Devices – Managing charging in electric vehicles, energy storage systems, and backup power solutions.
It features MPPT (Maximum Power Point Tracking) for efficient solar energy harvesting and is ideal for low to medium-power solar applications.

The CN3791 is available in a SOP-8 (Small Outline Package) type. This surface-mount package is compact and suitable for various power management applications, including solar charging and battery management. Its small size and 8-pin configuration make it easy to integrate into PCB designs.