BQ24008中文资料具有双色 LED、集成 FET 和计时器使能端的单节 1.2A 线性锂离子电池充电器数据手册TI规格书

描述 Description

The bq2400x series ICs are advanced Li-Ion linear charge management devices for highly integrated and space-limited applications. They combine high-accuracy current and voltage regulation; FET pass-transistor and reverse-blocking Schottky; battery conditioning, temperature, or input-power monitoring; charge termination; charge-status indication; and charge timer in a small package.

The bq24007 and bq24008 provide the timer-enable function, allowing the host to disable the charge timer when charge current is shared with a load or when the battery is absent. This feature is ideal for applications such as cellular phones, PDAs, and internet appliances.

The bq2400x measures battery temperature using an external thermistor. For safety reasons, the bq2400x inhibits charge until the battery temperature is within the user-defined thresholds. Alternatively, the user can monitor the input voltage to qualify charge. The bq2400x series then charge the battery in three phases: preconditioning, constant current, and constant voltage. If the battery voltage is below the internal low-voltage threshold, the bq2400x uses low-current precharge to condition the battery. A preconditioning timer provides additional safety. Following pre-conditioning, the bq2400x applies a constant-charge current to the battery. An external sense-resistor sets the magnitude of the current. The constant-current phase is maintained until the battery reaches the charge-regulation voltage. The bq2400x then transitions to the constant voltage phase. The user can configure the device for cells with either coke or graphite anodes. The accuracy of the voltage regulation is better than ±1% over the operating junction temperature and supply voltage range.

Charge is terminated by maximum time or minimum taper current detection

The bq2400x automatically restarts the charge if the battery voltage falls below an internal recharge threshold.

特性 Features

• Highly Integrated Solution With FET Pass Transistor and Reverse-Blocking Schottky and Thermal Protection
• Integrated Voltage and Current Regulation With Programmable Charge Current
• Ideal for Low-Dropout Linear Charger Designs for Single-Cell Li-Ion Packs With Coke or Graphite Anodes
• Safety-Charge Timer During Preconditioning and Fast Charge
• Optional Temperature or Input-Power Monitoring Before and During Charge
• Charge Termination by Minimum Current and Time
• Packaging: 5 mm × 5 mm MLP (bq24007)or 20-Lead TSSOP PowerPAD™
• PDAs
• MP3 Players
• Digital Cameras

PowerPAD is a trademark of Texas Instruments.