LT3468

PRODUCTION

Photoflash Capacitor Chargers in ThinSOT^™

Part Models: 6
1ku List Price: Starting From $2.63

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Overview

Highly Integrated IC Reduces Solution Size
Uses Small Transformers:
- 5.8mm × 5.8mm × 3mm
Fast Photoflash Charge Times:
- 4.6s for LT3468 (0V to 320V, 100µF, V_IN = 3.6V)
- 5.7s for LT3468-2 (0V to 320V, 100µF, V_IN = 3.6V)
- 5.5s for LT3468-1 (0V to 320V, 50µF, V_IN = 3.6V)
Controlled Input Current:
- 500mA (LT3468)
- 375mA (LT3468-2)
- 225mA (LT3468-1)
Supports Operation from Single Li-Ion Cell, or Any Supply from 2.5V up to 16V
Adjustable Output Voltage
No Output Voltage Divider Needed
Charges Any Size Photoflash Capacitor
Low Profile (<1mm) SOT-23 Package

The LT3468/LT3468-1/LT3468-2 are highly integrated ICs designed to charge photoflash capacitors in digital and film cameras. A patented control technique* allows for the use of extremely small transformers. Each device contains an on-chip high voltage NPN power switch. Output voltage detection* is completely contained within the device, eliminating the need for any discrete zener diodes or resistors. The output voltage can be adjusted by simply changing the turns ratio of the transformer. The LT3468 has a primary current limit of 1.4A, the LT3468-2 has a 1A limit, and the LT3468-1 has a 0.7A limit. These different current limit levels result in well controlled input currents of 500mA for the LT3468, 375mA for the LT3468-2 and 225mA for the LT3468-1. Aside from the differing current limit, the three devices are otherwise equivalent.

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 LT3468 series of parts are available in tiny low profile (1mm) SOT-23 packages.

Applications

Digital / Film Camera Flash
PDA / Cell Phone Flash
Emergency Strobe

Part Models: 6
1ku List Price: Starting From $2.63

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
LT3468ES5#TRMPBF	5-Lead TSOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3468ES5#TRPBF	5-Lead TSOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3468ES5-1#TRMPBF	5-Lead TSOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3468ES5-1#TRPBF	5-Lead TSOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3468ES5-2#TRMPBF	5-Lead TSOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3468ES5-2#TRPBF	5-Lead TSOT-23	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

LT3468 Demo Circuit - Strobe Capacitor Charger (2.5-8V to 320V)

Models for the following parts are available in LTspice:

LT3468
LT3468-1
LT3468-2

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.