Overview

Features and Benefits

  • Fast Charging of Li-Ion, NiMH and NiCd Batteries
  • Simple Charge Current Programming Requires Only One Low Cost, 1/32W Resistor
  • High Efficiency Charger with Up to 1.5A Charge Current
  • Precision 0.6% Internal Voltage Reference
  • Preset Battery Voltages: 4.1V, 4.2V, 8.2V, 8.4V
  • 500kHz or 200kHz Switching Frequency Minimizes Charger Size
  • Low Reverse Battery Drain Current: 5µA
  • Flag Indicates Li-Ion Charge Completion
  • 5% Typical Charge Current Accuracy
  • Low Shutdown Current
  • LT1571-1: 200kHz, Adjustable Voltage
  • LT1571-2: 200kHz, Fixed 8.2V or 8.4V
  • LT1571-5: 500kHz, Fixed 4.1V or 4.2V

Product Details

The LT1571 PWM battery charger is a simple, efficient solution to fast-charge rechargeable batteries including lithium-ion (Li-Ion), nickel-metal-hydride (NiMH) and nickel-cadmium (NiCd) using constant-current and/or constant-voltage control. The internal switch is capable of delivering 1.5A DC current (2A peak current). The onboard current sense resistor (0.1Ω) allows simple charge current programming to within 5% accuracy using a low cost external resistor. The constant-voltage output can be selected for 4.1V or 4.2V per cell with 0.6% accuracy.

LT1571 can charge batteries ranging from 1V to 20V. A saturating switch operating at 200kHz (LT1571-1, LT1571-2) or 500kHz (LT1571-5) gives high efficiency and small charger size. A logic output (flag) indicates Li-Ion near full charge when the charge current drops to 20% of the programmed value. The LT1571-1 and LT1571-2 are in a 28-pin fused lead narrow SSOP power package. The LT1571-5 is in a 16-pin fused lead narrow SSOP power package.

Applications

  • Cellular Phones, PDAs, Notebook Computers, Portable Instruments
  • Cradle Chargers for Li-Ion, NiCd, NiMH and Lead-Acid Rechargeable Batteries

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (3)

Product Recommendations

LT1571 Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.