Features and Benefits

  • 12μA Standby Mode Quiescent Current (All Outputs On)
  • Seamless Transition Between Input Power Sources: Li-Ion/Polymer Battery and USB
  • 240mΩ Internal Ideal Diode Provides Low Loss PowerPath
  • High Efficiency 200mA Buck Regulator
  • 150mA Low Dropout (LDO) Linear Regulator
  • Pushbutton On/Off Control With System Reset
  • Full Featured Li-Ion/Polymer Battery Charger
  • Programmable Charge Current With Thermal Limiting
  • Instant-On Operation With Discharged Battery
  • 3mm × 3mm × 0.75mm 20-Pin QFN Package

Product Details

The LTC3553 is a micropower, highly integrated power management and battery charger IC for single-cell Li-Ion/Polymer battery applications. It includes a PowerPath manager with automatic load prioritization, a battery charger, an ideal diode and numerous internal protection features. Designed specifically for USB applications, the LTC3553 power manager automatically limits input current to a maximum of either 100mA or 500mA. Battery charge current is automatically reduced such that the sum of the load current and the charge current does not exceed the selected input current limit. The LTC3553 also includes a synchronous buck regulator, a low dropout linear regulator (LDO), and a pushbutton controller. With all supplies enabled in standby mode, the quiescent current drawn from the battery is only 12μA. The LTC3553 is available in a 3mm × 3mm × 0.75mm 20-pin QFN package.

Option LDO PGOOD Hard Reset Time
LTC3553 ON/OFF Control No 5 Seconds
LTC3553-2 Always On Yes 14 Seconds


  • USB-Based Handheld Products
  • Portable Li-Ion/Polymer Based Electronic Devices
  • Wearable Electronics
  • Low Power Medical Devices

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

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LTC3553 Companion Parts

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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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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.