Power Management Inductorless (Charge Pump) DC/DC Converters Inductorless (Charge Pump) LED Drivers

LTC3214 - 500mA Camera LED Charge Pump

Features

  • Low Noise Constant Frequency Operation
  • High Efficiency: Up to 94%
  • Multi-Mode Operation: 1x, 1.5x or 2x Boost Modes
  • Automatic Mode Switching
  • High Output Current: Up to 500mA
  • Tiny Application Circuit (3mm × 3mm DFN Package All Components <1mm High)
  • Automatic Soft-Start
  • Output Disconnect
  • Open, Shorted LED Protection
  • No Inductors
  • Internal 110mΩ LED Current Sense Resistor 3mm × 3mm 10-Lead DFN Package

Typical Application

LTC3214 Typical Application
LTC3214 Typical Application

Description

The LTC3214 is a low noise, high current charge pump DC/DC converter capable of driving high current LEDs at up to 500mA from a 2.9V to 4.5V input. Low external parts count (two flying capacitors, one programming resistor and two bypass capacitors at VIN and CPO) make the LTC3214 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. Output current level is programmed by an external resistor. LED current is regulated using an internal 110mΩ sense resistor. Automatic mode switching optimizes efficiency by monitoring the voltage across the charge pump and switching modes only when dropout is detected. The part is available in a low profile 3mm x 3mm 10-lead DFN package.

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
LTC3214EDD#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC3214EDD#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes


LTC3214 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
LTC3214EDD#PBF 3x3 DFN-10 E $2.36 $1.65 Yes
LTC3214EDD#TRPBF 3x3 DFN-10 E $1.75 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
DC902A-A LTC3214EDD | Low Noise, High Current LED Flash Charge Pump, Vin = 2.9V - 4.4V, AOT LED Contact Factory
DC902A-B LTC3214EDD | Low Noise, High Current LED Flash Charge Pump, Vin = 2.9V - 4.4V, Lumimicro LED Contact Factory
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Click here to view our complete list of demo boards

Applications

  • LED Torch/Camera Light Supply for Cell Phones, PDAs and Digital Cameras
  • General Lighting and/or Flash/Strobe Applications

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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:
LTC3214

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