The HY2131-CF1A is a high-performance protection IC designed for 2-cell/3-cell lithium-ion/lithium-polymer battery packs. 

Engineered by HYCON Technology,It is a useful secondary protection chip for battery. Recently, 

some international requirements are required that consumer electronic products need to be equipped with 

secondary protection chips to better protect batteries. it offers advanced safety features, precise voltage/current monitoring, 

and robust reliability for rechargeable battery systems. Below is a detailed breakdown of its functions and applications:

Functions

1. High-Precision Voltage Detection
   • Overcharge Protection: Monitors each cell's voltage with adjustable thresholds (4.000V–4.550V ±20mV accuracy) . 
   • When a cell exceeds the set voltage, it triggers a cutoff to prevent overcharging.
   • Overcharge Release Voltage: Configurable from 3.800V–4.500V (±50mV accuracy) .
   • Standby Detection Voltage: Monitors cell voltages with a fixed threshold of 3.500V (±0.4mV accuracy) to optimize standby power consumption .
   • Overcurrent and Short-Circuit Protection: Built-in load short-circuit detection (fixed at 1.0V ±0.4V accuracy) with fast response times (250μs typical) .
2. Internal Delay Settings
   • Overcharge Detection Delay: ~6.0 seconds (±20% accuracy) eliminates the need for external components .
   • Shortened Delay Mode: Reduces overcharge detection delay to ~12ms (±50% accuracy) under specific conditions
   •  (e.g., when adjacent cells are at VSS) .
3. Low Power Consumption
   • Active Mode: Typical current consumption is 3.0μA (max 6.0μA at VDD=3.9V) .
   • Standby Mode: Ultra-low standby current (<0.5μA at Vcell=3.1V) .
4. Wide Voltage and Temperature Range
   • Operating Voltage: Supports 1.5V–30V, suitable for 2-cell/3-cell Li-ion/Li-polymer batteries (nominal 7.4V/11.1V) .
   • Temperature Range: Operates from -40°C to +85°C and withstands storage from -40°C to +125°C .
5. Selectable Features
   • Dual/Triple-Cell Configuration: Switch between 2-cell and 3-cell applications via external circuits .
   • 0V Battery Charging: Optional support for charging deeply discharged batteries (refer to datasheet for settings) .
6. Robust Design
   • High-Voltage Tolerance: Charger-connected pins (CS/OC) withstand up to 30V .
   • Halogen-Free and RoHS-Compliant: Meets environmental standards for green manufacturing .

Applications

1. Portable Electronics
   • Power banks, wireless earbuds, and handheld gaming consoles needing extended runtime with 7.4V/11.1V batteries.
   • Example: Electric toothbrushes and wearable devices (e.g., smartwatches with multi-cell battery packs) .
2. Power Tools
   • Cordless drills, screwdrivers, and garden equipment relying on 2-cell/3-cell Li-ion batteries for high power output.
3. Industrial Equipment
   • IoT sensors, remote controls, and medical devices requiring reliable battery management in harsh environments.
   • Example: Industrial-grade handheld scanners and field monitoring systems .
4. Small-Scale Energy Storage
   • Backup power systems, LED lighting, and smart home devices with dual/triple-cell battery packs.
5. Automotive Accessories
   • Car dash cams, tire inflators, and emergency jump starters using 2-cell/3-cell batteries.

Technical Specifications

Package and Pinout

• Package: TSOT-23-6 (compact design for space-constrained applications) .
• Pins:
  • VDD: Power supply.
  • CO: Charge control output.
  • DO: Discharge control output.
  • VC1, VC2, VC3: Voltage monitoring inputs for each cell.
  • GND: Ground.
  • NC: No connection.
  • HY2131-AF1A, Overcharge protection voltage 4.350V,
    
  • HY2131-CF1A,Overcharge protection voltage 4.400V

The following parts are popular search parts in Miscellaneous.

The following parts include "HY2131-CF1A" in ISSI, Integrated Silicon Solution Inc“HY2131-CF1A”.

• Part Number
• Manufacturer
• Package
• Description