LTC3203/LTC3203-1/LTC3203B/LTC3203B-1 - 500mA Output Current Low Noise Dual Mode Step-Up Charge Pumps


  • Selectable Dual Mode Operation: 1:1.5 or 1:2
  • High Output Current: Up to 500mA
  • Low Noise Constant Frequency (1MHz/0.9MHz) Operation
  • VIN Range: 2.7V to 5.5V
  • Adjustable Output Voltage (LTC3203/LTC3203B)
  • User Selectable Fixed Output Voltages: 4.5V or 5V (LTC3203-1 and LTC3203B-1)
  • Automatic Burst Mode® Operation with IQ ~ 120µA (LTC3203/LTC3203-1)
  • Constant Freqency Operation at All Loads (LTC3203B/LTC3203B-1)
  • Soft-Start Limits Inrush Current at Turn-On
  • Short-Circuit/Thermal Protection
  • Shutdown Disconnects Load from Input
  • Shutdown Current: < 1µA
  • Available in a 10-pin (3mm × 3mm) DFN Package

Typical Application

LTC3203 Typical Application
LTC3203 Typical Application


The LTC3203/LTC3203-1/LTC3203B/LTC3203B-1 are low noise, high efficiency charge pump DC/DC converters capable of driving loads up to 500mA from a 2.7V to 5.5V input. Low external parts count (two flying capacitors and bypass capacitors at VIN and VOUT) make the LTC3203 family ideally suited for small, battery-powered applications.

Built-in soft-start circuitry prevents excessive inrush current during start-up. High switching frequency enables the use of small external capacitors. The LTC3203/ LTC3203-1 feature Burst Mode operation at light load to achieve high efficiency whereas the LTC3203B/ LTC3203B-1 operate at constant frequency to achieve lowest noise operation.

The LTC3203-1/LTC3203B-1 have a user selectable fixed output voltage of 4.5V or 5V to power LEDs or logic circuits. The FB pin of the LTC3203/LTC3203B can be used to program the desired output voltage. The parts are short circuit and over temperature protected and are available in a low profile (3mm × 3mm) 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
LTC3203BEDD-1#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC3203BEDD-1#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC3203BEDD#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC3203BEDD#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC3203EDD-1#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC3203EDD-1#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC3203EDD#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC3203EDD#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes

LTC3203 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
LTC3203BEDD-1#PBF 3x3 DFN-10 E $2.86 $2.00 Yes
LTC3203BEDD-1#TRPBF 3x3 DFN-10 E $2.06 Yes
LTC3203BEDD#PBF 3x3 DFN-10 E $2.86 $2.00 Yes
LTC3203BEDD#TRPBF 3x3 DFN-10 E $2.06 Yes
LTC3203EDD-1#PBF 3x3 DFN-10 E $2.86 $2.00 Yes
LTC3203EDD-1#TRPBF 3x3 DFN-10 E $2.06 Yes
LTC3203EDD#PBF 3x3 DFN-10 E $2.86 $2.00 Yes
LTC3203EDD#TRPBF 3x3 DFN-10 E $2.06 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
DC863A-A LTC3203B Demo Board | Regulated Boost Charge Pump, 2.7V ≤ VIN ≤ 4V, Vout = 3.3V @ Up to 500mA $100.00
DC863A-B LTC3203-1 Demo Board | Regulated Boost Charge Pump, 2.7V ≤ VIN ≤ 5.5V, Vout = 4.5V or 5V @ Up to 500mA $100.00
DC863A-C LTC3203B-1 Demo Board | Regulated Boost Charge Pump, 2.7V ≤ VIN ≤ 5.5V, Vout = 4.5V or 5V @ Up to 500mA $100.00
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Click here to view our complete list of demo boards


  • High Current LED Backlight Supply for
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  • Cellphone Camera Light Supply
  • General Purpose 3.3V or Li-Ion to 5V Supply
  • USB ON THE GO(OTG) Devices

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