FM DW01HA.

The DW01HA series is a high-precision protection IC for single-cell rechargeable lithium batteries, integrating overcharge protection, overdischarge protection, and overcurrent discharge protection. Under normal operating conditions, the VDD pin voltage falls between the overcharge protection threshold (VOC) and the overdischarge protection threshold (VOD), while the VM sense pin voltage remains between the charger detection voltage (VCHG) and the overcurrent discharge protection threshold (VEDI). In this state, both COUT and DOUT outputs are driven high, turning on the external charge-control N-MOSFET Q1 and discharge-control N-MOSFET Q2. This allows the battery to be charged via a charger or discharged through a load. Protection is implemented by monitoring the VDD or VM pin voltage relative to VSS. When a protection condition is triggered, the corresponding COUT or DOUT output transitions from high to low, turning off the associated MOSFET and terminating the charge or discharge process. Each protection state has a defined release condition; once met, the IC exits the protection state and returns to normal mode. All protection and release actions incorporate delay timers — a state transition occurs only if the triggering condition persists beyond the programmed delay period. If the condition clears within the delay window, no state transition is initiated.

• Ideal protection circuit for single-cell Li-Ion or Li-Polymer batteries
• High-accuracy protection voltage (overcharge/overdischarge) detection
• High-accuracy overcurrent discharge protection detection
• Battery short-circuit protection
• Minimal external components
• Ultra-compact SOT23-6 package

• Charge/discharge protection circuit for lithium batteries
• High-precision protector for phone batteries or other lithium batteries