MAX1737

独立的开关模式锂离子电池充电控制器


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说明

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.
MAX1737:典型工作电路 MAX1737:典型工作电路 放大+

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

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
Part NumberLithium Ion CellsProtected VIN
(V)
Charging VIN
(V)
Charge Rate Set byMax. ICHG
(A)
Charge TerminationCharge RegulationOper. Temp.
(°C)
Package/PinsBudgetary
Price
maxmaxSee Notes
MAX1737 
1
2
3
4
2828Resistor4TimerSwitchmode-40 to +85
QSOP/28
$2.93 @1k
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Pricing Notes:
价格仅供参考,用于同类产品的比较。所提供报价为美元,需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题,请参考:价格与供货网站或与指定代理商联系。


MAX1737EVKIT: MAX1737评估板

CAD Symbols and Footprints

  • MAX1737EEI+
  • MAX1737EEI+T
  • 型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

    备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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    相关资料


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    类型 编号 标题
    评估板2434MAX1737EVKIT MAX1737评估板