LT3484

PRODUCTION

Photoflash Capacitor Charger

Part Models: 6
1ku List Price: Starting From $2.61

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Overview

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, V_IN = 3.6V)
- 5.7s for LT3484-2 (0V to 320V, 100µF, V_IN = 3.6V)
- 5.5s for LT3484-1 (0V to 320V, 50µF, V_IN = 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 V_BAT 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.

Applications

Digital Camera and Cell Phone Flash Charger

Part Models: 6
1ku List Price: Starting From $2.61

Documentation

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. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT3484EDCB-0#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3484EDCB-0#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3484EDCB-1#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3484EDCB-1#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3484EDCB-2#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3484EDCB-2#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice 1

LT3484-0 Demo Circuit - Photoflash Capacitor Charger (3V to 320V)

Models for the following parts are available in LTspice:

LT3484-0
LT3484-1
LT3484-2

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.