MAX1873

Simple Current-Limited Switch-Mode Li+ Charger Controller

Lowest Cost Switch-Mode Li+ Charger includes Input-Current Limiting Loop


Please check latest availability status for a specific part variant.

Description

The low-cost MAX1873R/S/T provides all functions needed to simply and efficiently charge 2-, 3-, or 4-series lithium-ion cells at up to 4A or more. 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 MAX1873R/S/T 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 analog voltage output proportional to charging current is also supplied so that an ADC or microcontroller can monitor charging current.

The MAX1873 may also be used as an efficient current-limited source to charge NiCd or NiMH batteries in multichemistry charger designs. The MAX1873R/S/T is available in a space-saving 16-pin QSOP package. Use the evaluation kit (MAX1873EVKIT) to help reduce design time.
MAX1873: Typical Operating Circuit MAX1873: Typical Operating Circuit Enlarge+

Key Features

  • 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
  • Adjustable Charging Current
  • 300kHz PWM Oscillator Reduces Noise
  • Space-Saving 16-Pin QSOP
  • MAX1873 Evaluation Kit Available to Speed Designs

Applications/Uses

  • 2-, 3-, or 4-Cell Li+ Battery Pack Chargers
  • 6-, 9-, or 10-Cell Li+ Battery Pack Chargers
  • Desktop Cradle Chargers
  • Handheld Instruments (PDAs, Palmtops)
  • Notebook Computers
  • Portable Desktop Assistants (PDAs)
  • Portable Internet Tablets
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
MAX1873 
2
3
4
2828Resistor4External ControlSwitchmode-40 to +85
QSOP/16
$1.98 @1k
See All Battery Chargers (74)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX1873EVKIT: Evaluation Kit for the MAX1873

Technical Documents

App Note 4169 Understanding Li+ Battery Operation Lessens Charging Safety Concerns

Quality and Environmental Data

Product Reliability Reports: MAX1873.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX1873REEE
  • MAX1873REEE+
  • MAX1873REEE+T
  • MAX1873REEE-T
  • MAX1873SEEE
  • MAX1873SEEE+
  • MAX1873SEEE+T
  • MAX1873SEEE-T
  • MAX1873TEEE
  • MAX1873TEEE+
  • MAX1873TEEE+T
  • MAX1873TEEE-T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

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