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
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
语言下载文件备注
英文MAX1757.pdfRev 2; 06/2015
关键参数
Part NumberProtected VIN
(V)
Charging VIN
(V)
Charge Rate Set byMax. ICHG
(A)
Charge TerminationCharge RegulationOper. Temp.
(°C)
Package/PinsBudgetary
Price
maxSee Notes
MAX17571414Resistor1.5TimerSwitchmode-40 to +85SSOP/28$3.26 @1k
开发工具
技术资料
质量和环境数据
订购型号
型号状况推荐替代产品封装温度RoHS/无铅
MAX1757EAI停止供货MAX1757EAI+SSOP,;28引脚;81.6mm²-40°C至+85°C参考数据资料
MAX1757EAI+生产中SSOP,;28引脚;81.6mm²-40°C至+85°CRoHS/无铅:无铅
MAX1757EAI+T生产中SSOP,;28引脚;81.6mm²-40°C至+85°CRoHS/无铅:无铅
MAX1757EAI-T停止供货MAX1757EAI+TSSOP;28引脚-40°C至+85°C参考数据资料
MAX1757.pdf MAX1757
MAX1757.pdf MAX1757
MAX1757.pdf MAX1757
Efficiency Improvement in Battery Mode - MAX1737, MAX1757, MAX1758 MAX1758
MAX1757.pdf MAX1757