MAX1873TEEE Li+ charger controller in 16 pin SMD IC

MAX1873TEEE Li+ charger controller in 16 pin SMD IC

The MAX1873TEEE 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.

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• Low-Cost and Simple Circuit
  

• Charges 2-, 3-, or 4-Series Lithium-Ion Cells
  

• AC Adapter Input-Current-Limit Loop
  

• Also Charges Ni-Based Batteries
  

• Analog Output Monitors Charge Current
  

• ±0.75% Battery-Regulation Voltage
  

• 5µA Shutdown Battery Current
  

• Input Voltage Up to 28V
  

• 200mV Dropout Voltage/100% Duty Cycle
  

Specifications of MAX1873TEEE Li+ charger controller in 16 pin SMD IC

• Input Voltage Range: 2V to 28V
  

• Output Voltage: Adjustable up to 28V
  

• Switching Frequency: 300kHz (nominal)
  

• Output Current: Dependent on external components and input voltage, typically up to 2A
  

• Efficiency: Up to 95%
  

• Quiescent Current: 110µA (typical)
  

• Shutdown Current: 1µA (typical)
  

• Temperature Range: -40°C to +85°C (operating)
  

Package Includes

• 1 x MAX1873TEEE Li+ charger controller in 16 pin SMD IC