CN303

CN303 is a dual-channel voltage detection IC with two high-precision voltage comparators. The chip integrates two voltage comparators, a bandgap reference, and a hysteresis control circuit. When the voltage at IN1 (IN2) exceeds the rising threshold VRTH of CN303, OUT1 (OUT2) goes high after a brief delay (typically 15μs). When the voltage at IN1 (IN2) falls below the falling threshold VFTH of CN303, OUT1 (OUT2) goes low after a brief delay (typically 15μs). The difference between the rising and falling thresholds represents the comparator hysteresis of CN303, which prevents detection output glitches caused by noise on the monitored supply or battery voltage instability due to sudden load changes. The hysteresis of CN303 is 7.5% of the rising threshold. CN303 can monitor two voltage points or two independent voltage sources, making it suitable for single-cell or multi-cell Li-ion batteries, multi-cell alkaline batteries, NiCd batteries, NiMH batteries, and multi-cell lead-acid battery voltage monitoring. CN303 is particularly well-suited for applications where one comparator monitors the battery low-voltage alarm threshold and the other monitors the battery cutoff voltage.

Applications

• Battery-powered systems
• Multi-cell battery voltage monitoring
• Set-top boxes
• DSP, microcontrollers
• Mobile phones, PDAs, etc.

Key features

• Dual-channel, low-power, high-precision voltage comparator
• Threshold detection accuracy: ±2%
• 7.5% comparator hysteresis eliminates detection output glitches
• CMOS output capable of driving LEDs or MCU interfaces
• Operating current 11μA at VCC = 3.7V
• Filtering for short-duration voltage dips
• Operating temperature range: -40℃ to +85℃
• 6-pin SOT23 package
• Lead-free, RoHS compliant, halogen-free