مدار مجتمع (آی سی) آی‌سی مدیریت توان (پی‌ام‌آی‌سی) مدیریت باتری (بی‌ام‌اس)

Product Attributes

Introduction

The FM2119L series is a high-precision overcharge and overdischarge protection circuit for single-cell rechargeable lithium batteries, integrating high-precision overvoltage charge protection, overvoltage discharge protection, and overcurrent discharge protection. Under normal operating conditions, the VDD pin voltage of FM2119L 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 a high level, turning on the external charge control N-MOS transistor Q1 and discharge control N-MOS transistor Q2, respectively. This allows the battery to be charged via a charger or discharged through a load.

FM2119L 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 stopping the charge/discharge process. FM2119L has a corresponding recovery condition 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. FM2119L incorporates a delay time for each protection/recovery condition — the corresponding protection/recovery action is only triggered after the condition persists for the specified delay period. If the protection/recovery condition clears before the delay time elapses, the circuit does not enter the protection/recovery state.

Features

• 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 overcurrent discharge 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

Applications

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