MAX1873REEE ANALOG DEVICES Step-Down DC-DC Converter Controller IC

MAX1873REEE ANALOG DEVICES Step-Down DC-DC Converter Controller IC

The MAX1873REEE+ is a simple current-limited switch mode Li+ charger controller in 16 pin QSOP package. It provides a regulated charging current and voltage with less than ±0.75% total voltage error at the battery terminals. An external P channel MOSFET operates in a step down DC-DC configuration to efficiently charge batteries in low cost designs. The MAX1873 device regulates the battery voltage and charging current using two control loops that work together to transition smoothly between voltage and current regulation. An additional control loop limits current drawn from the input source so that AC adapter size and cost can be minimized. An analogue voltage output proportional to charging current is also supplied so that an ADC or microcontroller can monitor charging current. This device is used as an efficient current limit source to charge Ni Cd or NiMH batteries in multi-chemistry charger designs.

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• Charges 2 lithium-ion cells or 5 or 6 Ni battery cells
  

• Operating temperature range from -40°C to 85°C
  

• Input voltage range from 6VDC to 28VDC, charging current is 4A
  

• AC adapter input current limit loop
  

• Analogue output monitors charge current
  

• 5µA shutdown battery current
  

• 200mV dropout voltage, 100% duty cycle
  

Specifications of MAX1873REEE ANALOG DEVICES Step-Down DC-DC Converter Controller IC

• Input Voltage Range: 4.5V to 28V.

• Output Voltage: Adjustable through external resistors.

• Switching Frequency: 200 kHz (fixed).

• Output Current: Dependent on the external MOSFET and configuration.

• Efficiency: High efficiency due to synchronous rectification (typically 90%+ under optimal conditions).

• Control Type: Voltage-mode control with synchronous rectification.

Package Includes

• 1 x MAX1873REEE ANALOG DEVICES Step-Down DC-DC Converter Controller IC