Features
 Overcharge protection
• Threshold range: 3.650V, 3.850V, 4.175V–4.375V;
25mV steps, ±25mV accuracy
 Over-discharge protection
• Threshold range: 2.300V–2.800V; 100mV steps,
±30mV accuracy
 Discharge overcurrent protection
• Overcurrent detection 1
Threshold range: 0.050V–0.100V, ±5mV accuracy
• Overcurrent detection 2
Threshold range: 0.100V–0.200V, ±10mV accuracy
• Short-circuit protection
Threshold range: 0.200V–0.500V, ±20mV accuracy
 Charge overcurrent protection
• Threshold range: -0.010V to -0.050V, ±5mV accuracy
 Temperature detection function
• High/low-temperature protection for charging and discharging;
protection thresholds externally configurable
 Cell balancing function
 Open-wire detection function
 Load detection function
 Low power consumption design
• Active mode: 20µA (25°C)
• Sleep mode: 5µA (25°C)
 Package: SSOP16

Applications
 Robot vacuums
 Power tools
 Backup power supplies
 Li-ion and Li-polymer battery packs

General Description
The CW1244 series is a highly integrated protection IC designed for 3- or 4-cell Li-ion or Li-polymer battery packs. It provides protection against overcharge, over-discharge, charge/discharge overcurrent, wire breakage, and charge/discharge over-temperature, as well as cell balancing functionality.