LTC1986 - 3V/5V SIM Power Supply in ThinSOT


  • VIN Range: 2.6V to 4.4V
  • Ultralow Power
    Operating Current: 14µA
    Shutdown Current: <1µA
  • No Inductors
  • Short-Circuit/Thermal Protected
  • Ultrasmall Application Circuit (<0.045in² )
  • Low Profile (1mm) ThinSOT™
  • Step-Up Charge Pump Generates 5V
  • Output Current: 10mA
  • VIN to VOUT Direct Connection for 3V SIMs
  • Switching Frequency: 900kHz
  • Soft-Start Limits Inrush Current at Turn-On
  • Output Driven to Ground During Shutdown

Typical Application

LTC1986 Typical Application
LTC1986 Typical Application


The LTC1986 is a micropower charge pump DC/DC converter that provides power for either 3V or 5V GSM SIM cards. It operates in one of three modes: VOUT = 5V (5V mode), VOUT = VIN (3V mode) or shutdown. The input voltage range is 2.6V to 4.4V and the part can provide 10mA of output current. The LTC1986 allows VIN to drop as low as 2.6V by providing a boost feature in 3V mode. In 3V mode, VOUT is connected directly to VIN through a 2.5W switch until VIN drops below 2.85V. When VIN is below 2.85V, the part automatically boosts VOUT to maintain a regulated 2.9V output, thereby ensuring VOUT stays within the 3V SIM VCC specification.

Extremely low operating current (14µA typical with no load) and low external parts count make the part ideally suited for small, light load battery-powered applications. The total PCB area of the application circuit shown below is less than 0.045in². Protection features include inrush current limiting, undervoltage lockout, short circuit and thermal overload protection. The LTC1986 is available in a low profile (1mm) SOT-23 package.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC1986ES6#PBF SOT-23 S6 E 05-08-1636 Yes
LTC1986ES6#TRMPBF SOT-23 S6 E 05-08-1636 Yes
LTC1986ES6#TRPBF SOT-23 S6 E 05-08-1636 Yes

LTC1986 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC1986ES6#PBF SOT-23 E $1.70 Yes
LTC1986ES6#TRMPBF SOT-23 E $1.70 $1.48 Yes
LTC1986ES6#TRPBF SOT-23 E $1.70 $1.43 Yes
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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 Linear Technology sales office or authorized distributor.

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Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

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