1. Products
  2. Power Management
  3. Battery Management
  4. Battery Charger IC
  5. Switching Battery Chargers
  6. LT1505


Features and Benefits

  • Simple Charging of Li-Ion, NiMH and NiCd Batteries
  • Very High Efficiency: Up to 97%
  • Precision 0.5% Charging Voltage Accuracy
  • Preset Battery Voltages: 12.3V, 12.6V, 16.4V and 16.8V
  • 5% Charging Current Accuracy
  • Charging Current Programmed by Resistor or DAC
  • 0.5V Dropout Voltage, Duty Cycle > 99.5%
  • AC Adapter Current Limit* Maximizes Charging Rate
  • Flag Indicates Li-Ion Charge Completion
  • Auto Shutdown with Adapter Removal
  • Only 10µA Battery Drain When Idle
  • Synchronizable Up to 280kHz

Product Details

The LT1505 PWM battery charger controller fast charges multiple battery chemistries including lithium-ion (Li-Ion), nickel-metal-hydride (NiMH) and nickel-cadmium (NiCd) using constant-current or constant-voltage control. Maximum current can be easily programmed by resistors or a DAC. The constant-voltage output can be selected for 3 or 4 series Li-Ion cells with 0.5% accuracy.

A third control loop limits the current drawn from the AC adapter during charging*. This allows simultaneous operation of the equipment and fast battery charging without overloading the AC adapter.

The LT1505 can charge batteries ranging from 2.5V to 20V with dropout voltage as low as 0.5V. Synchronous N-channel FETs switching at 200kHz give high efficiency and allow small inductor size. A diode is not required in series with the battery because the charger automatically enters a 10µA sleep mode when the wall adapter is unplugged. A logic output indicates Li-Ion full charge when current drops to 20% of the programmed value.

The LT1505 is available in a 28-pin SSOP package.


  • Notebook Computers
  • Portable Instruments
  • Chargers for Li-Ion, NiMH, NiCd 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 (1)

Tools & Simulations


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Models for the following parts are available in LTspice:


Product Recommendations

LT1505 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.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LT1505CG#PBF Material Declaration Reliability Data 28-Lead SSOP
LT1505CG#TRPBF Material Declaration Reliability Data 28-Lead SSOP
LT1505CG-1#PBF Material Declaration Reliability Data 28-Lead SSOP
LT1505CG-1#TRPBF Material Declaration Reliability Data 28-Lead SSOP
Wafer Fabrication Data R324 Reliability Data

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Sample & Buy

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Lead Times

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Evaluation Boards

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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.