LTC3202 - Low Noise, High Efficiency Charge Pump for White LEDs

Features

  • Low Noise Constant Frequency Operation
  • 25% Less Input Current Than Doubler Charge Pump
  • High Output Current: Up To 125mA
  • Small Application Circuit
  • Regulated Output Voltage or Current
  • Automatic Soft-Start
  • VIN Range: 2.7V to 4.5V
  • No Inductors
  • 1.5MHz Switching Frequency
  • ICC < 1µA in Shutdown
  • Available in 10-Pin MSOP and 3mm x 3mm DFN Packages
 

Typical Application

LTC3202 Typical Application
LTC3202 Typical Application

Description

The LTC3202 is a low noise, constant frequency charge pump DC/DC converter that uses fractional conversion to increase efficiency in white LED applications. The part can be used to produce a regulated voltage or current of up to 125mA from a 2.7V to 4.5V input. Low external parts count (two flying capacitors and two small bypass capacitors at VIN and VOUT) make the LTC3202 ideally suited for small, battery-powered applications.

An internal 2-bit DAC allows LED current to be adjusted for LED brightness control. The LTC3202 also has thermal shutdown protection and can survive a continuous shortcircuit from VOUT to GND. Built-in soft-start circuitry prevents excessive inrush current during start-up. High switching frequency enables the use of small external capacitors. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1µA.

The LTC3202 is available in the 10-pin MSOP and 3mm x 3mm DFN packages.

Packaging

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
Drawing
RoHS
LTC3202EDD#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC3202EDD#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC3202EMS#PBF MS-10 MS E 05-08-1661 Yes
LTC3202EMS#TRPBF MS-10 MS E 05-08-1661 Yes


LTC3202 Package Drawing
LTC3202 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
(1-99)
Price
(1k)*
RoHS
LTC3202EDD#PBF 3x3 DFN-10 E $2.93 $2.00 Yes
LTC3202EDD#TRPBF 3x3 DFN-10 E $2.10 Yes
LTC3202EMS#PBF MS-10 E $2.25 $1.90 Yes
LTC3202EMS#TRPBF MS-10 E $1.96 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
DC395A LTC3202EMS Demo Board | Fractional Charge Pump LED Driver, 6 Paralleled LEDs, 2.7V ≤ VIN ≤ 4.5V, VLED up to 4V @ 120mA Contact Factory
DC633A LTC3202EDD | High Efficiency White LED Driver Contact Factory
Buy Now
Click here to view our complete list of demo boards

Applications

  • White LED Backlighting
  • Programmable Boost Current Source
 

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC3202

Technical Support