Features and Benefits
- Highly Integrated IC in 2mm × 3mm DFN Package Reduces Solution Size
- Uses Small Transformers:
- 5.8mm × 5.8mm × 3mm
- Fast Photoflash Charge Times:
- 4.6s for LT3484-0 (0V to 320V, 100µF, VIN = 3.6V)
- 5.7s for LT3484-2 (0V to 320V, 100µF, VIN = 3.6V)
- 5.5s for LT3484-1 (0V to 320V, 50µF, VIN = 3.6V)
- Operates from Two AA Batteries, or Any Supply from 1.8V up to 16V
- Controlled Average Input Current
- 500mA (LT3484-0)
- 350mA (LT3484-2)
- 225mA (LT3484-1)
- No Output Voltage Divider Needed
- No External Schottky Diode Required
- Charges Any Size Photoflash Capacitor
- Available in 6-Lead 2mm × 3mm DFN Package
The LT3484 family of photoflash capacitor charger ICs is designed for use in digital camera and mobile phone applications where space is at a premium. The LT3484's patented control technique allows it to use extremely small transformers, and the improved NPN power switch requires no external Schottky diode clamp, reducing solution size. Output voltage detection requires no external circuitry as the transformer turns ratio determines final charge voltage.
The devices feature a VBAT pin, which allows the use of 2 alkaline cells to charge the capacitor. The LT3484-0, -2 and -1 have primary current limits of 1.4A, 1A and 0.7A respectively, resulting in tightly controlled average input current of 500mA, 350mA and 225mA respectively. The three versions are otherwise identical.
The CHARGE pin gives full control of the part to the user. Driving CHARGE low puts the part in shutdown. The DONE pin indicates when the part has completed charging. The LT3484 series of parts are housed in a tiny low profile 2mm × 3mm DFN package.
- Digital Camera and Cell Phone Flash Charger
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (3)
DC855A-B: Demo Board for the LT3484 Photoflash Capacitor Charger.
DC855A-A: Demo Board for the LT3484 Photoflash Capacitor Charger.
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Models for the following parts are available in LTspice:
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.