MAX1737EEI+T

The MAX1737EEI+T is a stand-alone, switch-mode, lithium-ion battery charger controller in 28 pin QSOP package. This device 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. 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.

• Low dropout , 98% duty cycle
• Safely Pre-charges near-dead cells
• Continuous voltage and temperature monitoring
• <lt/> 1µA shutdown battery current
• Input voltage up to +28V
• Safety timer prevents overcharging
• Input current limiting
• 300KHz PWM oscillator reduces noise
• 90% conversion efficiency
• Operating temperature range from -40°C to 85°C

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Power Management, Portable Devices

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