LTC3221 - Micropower, Regulated Charge Pump in 2 x 2 DFN


  • Ultralow Power: 8μA Quiescent Current
  • Regulated Output Voltages: 3.3V ±4%, 5V ±4%, ADJ
  • VIN Range:
    1.8V to 4.4V (LTC3221-3.3)
    2.7V to 5.5V (LTC3221-5)
  • Output Current: Up to 60mA
  • No Inductors Needed
  • Very Low Shutdown Current: <1μA
  • Shutdown Disconnects Load from VIN
  • Burst Mode Control
  • Short-Circuit Protected
  • Solution Profi le < 1mm
  • Tiny 2mm × 2mm 6-Pin DFN Package

Typical Application

LTC3221 Typical Application
LTC3221 Typical Application


The LTC3221 family are micropower charge pump DC/DC converters that produce a regulated output at up to 60mA. The input voltage range is 1.8V to 5.5V. Extremely low operating current (8μA typical at no load) and low external parts count (one flying capacitor and two small bypass capacitors at VIN and VOUT) make them ideally suited for small, battery-powered applications.

The LTC3221 family includes fi xed 5V and 3.3V output versions plus an adjustable version. All parts operate as Burst Mode switched capacitor voltage doublers to achieve ultralow quiescent current. The chips use a controlled current to supply the output and will survive a continuous short-circuit from VOUT to GND. The FB pin of the adjustable LTC3221 can be used to program the desired output voltage.

The LTC3221 family is available in a low profile (0.75mm) 2mm × 2mm 6-pin DFN 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
LTC3221EDC-3.3#PBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LTC3221EDC-3.3#TRMPBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LTC3221EDC-3.3#TRPBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LTC3221EDC-5#PBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LTC3221EDC-5#TRMPBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LTC3221EDC-5#TRPBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LTC3221EDC#PBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LTC3221EDC#TRMPBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LTC3221EDC#TRPBF 2x2 DFN-6 DC6 E 05-08-1703 Yes

LTC3221 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
LTC3221EDC-3.3#PBF 2x2 DFN-6 E $2.29 Yes
LTC3221EDC-3.3#TRMPBF 2x2 DFN-6 E $2.34 $1.65 Yes
LTC3221EDC-3.3#TRPBF 2x2 DFN-6 E $2.29 $1.60 Yes
LTC3221EDC-5#PBF 2x2 DFN-6 E $2.29 Yes
LTC3221EDC-5#TRMPBF 2x2 DFN-6 E $2.34 $1.65 Yes
LTC3221EDC-5#TRPBF 2x2 DFN-6 E $2.29 $1.60 Yes
LTC3221EDC#PBF 2x2 DFN-6 E $2.29 Yes
LTC3221EDC#TRMPBF 2x2 DFN-6 E $2.34 $1.65 Yes
LTC3221EDC#TRPBF 2x2 DFN-6 E $2.29 $1.60 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.

Demo Boards

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.

Part Number Description Price Documentation
DC862A-A LTC3221EDC-3.3 Demo Board | Micropower Regulated Charge Pump, 1.8V ≤ VIN ≤ 4.4V, Vout = 3.3V @ Up to 60mA $75.00
DC862A-B LTC3221EDC-5 Demo Board | Micropower Regulated Charge Pump, 2.7V ≤ VIN ≤ 5.5V, Vout = 5V @ Up to 60mA $75.00
DC862A-C LTC3221EDC Demo Board | Micropower Regulated Adj Output Charge Pump, 1.8V ≤ VIN ≤ 3.8V, Vout = 3V @ Up to 60mA $75.00
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Click here to view our complete list of demo boards


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