LT3485
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LT3485

Photoflash Capacitor Chargers with Output Voltage Monitor and Integrated IGBT Drive

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 8
1ku List Price Starting From $2.72
Features
  • Integrated IGBT Driver
  • Voltage Output Monitor
  • Uses Small Transformers: 5.8mm × 5.8mm × 3mm
  • Operates from Two AA Batteries, Single Cell Li-Ion
    or Any Supply from 1.8V up to 10V
  • No Output Voltage Divider Needed
  • No External Schottky Diode Required
  • Charges Any Size Photoflash Capacitor
  • Available in 10-Lead (3mm × 3mm) DFN
Additional Details
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The LT3485 family of photoflash chargers are highly integrated ICs containing complete charger and IGBT drive functions. The patented control technique of the LT3485-x allows it to use extremely small transformers. Output voltage detection requires no external circuitry. The turns ratio of the transformer controls the final charge voltage. While charging, the output voltage on the capacitor may be monitored by a microcontroller from the monitor pin. Each device contains an on-chip high voltage NPN power switch, which can withstand negative voltages on the switch pin without an external Schottky diode. The device features a VBAT pin, which allows the use of two AA cells to charge the capacitor. The internal circuitry operates from the VIN pin. The LT3485-0 has a primary current limit of 1.4A, whereas the LT3485-3, LT3485-2, and LT3485-1 have current limits of 2A, 1A and 0.7A respectively. These different current limits result in tightly controlled input currents.

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 LT3485 series of parts are housed in a leadless (3mm × 3mm) DFN package.

Applications

  • Digital Camera and Cell Phone Flash Charger
Part Models 8
1ku List Price Starting From $2.72

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT3485EDD-0#PBF
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LT3485EDD-0#TRPBF
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LT3485EDD-1#PBF
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LT3485EDD-1#TRPBF
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LT3485EDD-2#PBF
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LT3485EDD-2#TRPBF
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LT3485EDD-3#PBF
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LT3485EDD-3#TRPBF
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 3

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DC895A-C

LT3485EDD-2 | Photoflash Charger, 350mA Input Current, VIN = 2.8V to 4.2V, VBAT = 1.8V to 4.2V, 5V Max

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DC895A-C

LT3485EDD-2 | Photoflash Charger, 350mA Input Current, VIN = 2.8V to 4.2V, VBAT = 1.8V to 4.2V, 5V Max

LT3485EDD-2 | Photoflash Charger, 350mA Input Current, VIN = 2.8V to 4.2V, VBAT = 1.8V to 4.2V, 5V Max

Product Detail

DC895A-C: Demo Board for the LT3485 Photoflash Capacitor Chargers with Output Voltage Monitor and Integrated IGBT Drive.

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DC895A-B

LT3485EDD-1 | Photoflash Charger, 225mA Input Current, VIN = 2.8V to 4.2V, VBAT = 1.8V to 4.2V, 5V Max

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DC895A-B

LT3485EDD-1 | Photoflash Charger, 225mA Input Current, VIN = 2.8V to 4.2V, VBAT = 1.8V to 4.2V, 5V Max

LT3485EDD-1 | Photoflash Charger, 225mA Input Current, VIN = 2.8V to 4.2V, VBAT = 1.8V to 4.2V, 5V Max

Product Detail

DC895A-B: Demo Board for the LT3485 Photoflash Capacitor Chargers with Output Voltage Monitor and Integrated IGBT Drive.

reference details image

DC895A-A

LT3485EDD-0 | Photoflash Charger, 500mA Input Current, VIN = 2.8V to 4.2V, VBAT = 1.8V to 4.2V, 5V Max

zoom

DC895A-A

LT3485EDD-0 | Photoflash Charger, 500mA Input Current, VIN = 2.8V to 4.2V, VBAT = 1.8V to 4.2V, 5V Max

LT3485EDD-0 | Photoflash Charger, 500mA Input Current, VIN = 2.8V to 4.2V, VBAT = 1.8V to 4.2V, 5V Max

Product Detail

DC895A-A: Demo Board for the LT3485 Photoflash Capacitor Chargers with Output Voltage Monitor and Integrated IGBT Drive.

Tools & Simulations

Tools & Simulations 1

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.

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