HL DW01A

The DW01A series is a high-precision overcharge and overdischarge protection circuit for single-cell rechargeable lithium batteries, integrating high-precision overcharge protection, overdischarge protection, and overcurrent discharge protection.

Under normal operating conditions, the VDD pin voltage of the DW01A is between the overcharge protection threshold (VOC) and the overdischarge protection threshold (VOD), and the VM detection pin voltage is between the charger detection voltage (VCHG) and the overcurrent discharge protection threshold (VEDI). In this state, both the COUT and DOUT pins output high, turning on the external charge control N-MOSFET Q1 and discharge control N-MOSFET Q2 respectively. This allows the battery to be charged by a charger or discharged through a load.

The DW01A performs overcharge/overdischarge protection by monitoring the VDD or VM pin voltage (relative to VSS). When a charge/discharge protection condition occurs, COUT/DOUT transitions from high to low, turning Q1/Q2 from on to off and halting the charge/discharge process.

The DW01A has corresponding recovery conditions for each protection state. Once the recovery condition is met, COUT/DOUT transitions from low to high, turning Q1/Q2 from off to on and returning to normal operation.

The DW01A applies a delay time for each protection/recovery condition. Protection or recovery is only triggered after the corresponding condition persists for the specified delay period. If the condition clears before the delay time elapses, the protection/recovery state will not be entered.

• Ideal protection circuit for single-cell Li-ion or Li-polymer batteries
• High-accuracy protection voltage (overcharge/overdischarge) detection
• Selectable low-power mode enable/disable under overdischarge conditions
• High-accuracy overdischarge current protection detection
• Battery short-circuit protection
• Multiple selectable detection voltage and delay time options
• Selectable 0V battery charging enable/disable across different models
• 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