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MAX1757：独立的开关模式Li+电池充电器，内置14V开关

紧凑的1节至3节锂离子电池充电器，使用内部功率开关，可提供高达1.5A的电流

The MAX1757 is a switch-mode lithium-ion (Li+) battery charger that charges one to three cells. It provides a regulated charging current accurate to ±10% and a regulated voltage with only a ±0.8% total voltage error at the battery terminals. The internal high-side switch delivers a programmable current of up to 1.5A to charge the battery. The built-in safety timer automatically terminates charging once the adjustable time limit has been reached. The MAX1757 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 (charging + system) and by automatically reducing battery-charging current prevents overload of the input supply, allowing the use of a low-cost wall adapter. The per-cell battery regulation voltage is set between 4.0V and 4.4V using standard 1% resistors. The number of cells is set from 1 to 3 by pin strapping. Battery temperature is monitored by an external thermistor to prevent charging outside the acceptable temperature range. The MAX1757 is available in a space-saving 28-pin SSOP package. Use the MAX1757EVKIT to help reduce design time. For a stand-alone charger with a 28V switch, refer to the MAX1758 data sheet. For a charger controller capable of up to 4A charging current, refer to the MAX1737 data sheet.

关键特性 Stand-Alone Charger Safely Charges Up to Three Li+ Batteries Continuous Voltage and Temperature Monitoring Input Current Limiting ±0.8% Battery Regulation Voltage Accuracy Up to 1.5A Programmable Charge Current Low Power Consumption Extends Battery Life 0.1µA Shutdown Battery Current Low-Dropout 98% Duty Cycle Flexible Input Voltage Range Enables the Use of Low Cost Wall Adapters Input Voltage Up to 14V Precharges Near-Dead Cells Fixed 300kHz PWM Oscillator Allows Effective Noise Filtering 28-Pin SSOP Package Saves Board Space

MAX1757：典型工作电路 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 PDA

数据手册DataSheet

关键参数

开发工具

• MAX1757EVKIT
• MAX1758EVKIT

技术资料

• Efficiency Improvement in Battery Mode - MAX1737, MAX1757, MAX1758

质量和环境数据

• MAX1757.pdf

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