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MAX1737：独立的开关模式锂离子电池充电控制器

The MAX1737 is a switch-mode lithium-ion (Li+) battery charger that charges one to four cells. It provides a regulated charging current and a regulated voltage with only a ±0.8% total voltage error at the battery terminals. The external N-channel switch and synchronous rectifier provide high efficiency over a wide input voltage range. A built-in safety timer automatically terminates charging once the adjustable time limit has been reached. The MAX1737 regulates the voltage set point and charging current using two loops that work together to transition smoothly between voltage and current regulation. An additional control loop monitors the total current drawn from the input source to prevent overload of the input supply, allowing the use of a low-cost wall adapter. The per-cell battery voltage regulation limit is set between +4.0V and +4.4V and can be set from one to four by pin strapping. Battery temperature is monitored by an external thermistor to prevent charging if the battery temperature is outside the acceptable range. The MAX1737 is available in a space-saving 28-pin QSOP package. Use the evaluation kit (MAX1737EVKIT) to help reduce design time.

关键特性 Stand-Alone Charger for Up to Four Li+ Cells ±0.8% Accurate Battery Regulation Voltage Low Dropout: 98% Duty Cycle Safely Precharges Near-Dead Cells Continuous Voltage and Temperature Monitoring < 1µA Shutdown Battery Current Input Voltage Up to +28V Safety Timer Prevents Overcharging Input Current Limiting Space-Saving 28-Pin QSOP 300kHz PWM Oscillator Reduces Noise 90% Conversion Efficiency

功能框图 产品应用 台式摇篮架充电器 手持式仪表(PDA、掌上电脑) Li+电池组 笔记本电脑

关键参数

数据手册DataSheet

开发工具

• MAX1737EVKIT

技术资料

• Efficiency Improvement in Battery Mode - MAX1737, MAX1757, MAX1758
• Charging Lithium Batteries with a Nonstandard Termination Voltage
• Understanding Li+ Battery Operation Lessens Charging Safety Concerns
• Improving Accuracy of the MAX1737 Lithium-Ion Battery Charger
• Reduce Component Count and Cut Costs by Disabling the MAX1737 Source-Current Loop
• Switch-Mode, Linear, and Pulse Charging Techniques for Li+ Battery in Mobile Phones and PDAs

质量和环境数据

• MAX1737.pdf

订购型号