CN302

CN302 is a low-power voltage detector IC with adjustable hysteresis. The chip integrates a voltage comparator, bandgap reference, and hysteresis control circuit. When the FTH pin voltage falls below the CN302 falling threshold, the output goes low and LBO goes high after a brief delay (typically 13us). When the RTH pin voltage rises above the CN302 rising threshold, the output goes high and LBO goes low after a brief delay (typically 12us). The difference between the rising and falling thresholds defines the hysteresis of the CN302 comparator, which eliminates false triggering caused by noise on the monitored supply or battery voltage instability due to sudden load transients. Since the rising and falling thresholds of the CN302 can be set independently, relatively large hysteresis values are supported. CN302 is particularly suited for monitoring single-cell or multi-cell Li-ion batteries, multi-cell alkaline batteries, NiCd batteries, NiMH batteries, and multi-cell lead-acid battery voltages.

Applications

• Battery-powered systems
• Single-cell or multi-cell lithium battery monitoring
• Multi-cell alkaline, NiCd, and NiMH battery monitoring
• Multi-cell lead-acid battery monitoring

Key features

• Threshold detection accuracy: ±2%
• Hysteresis eliminates detection output glitches
• Adjustable hysteresis
• CMOS output
• Active-low and active-high detection outputs available
• Operating current 9.5μA at VCC=3V
• Filtering for short-duration power supply transients
• Operating temperature range: -40°C to +85°C
• Package: 6-pin SOT23
• Lead-free, RoHS compliant, halogen-free