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Datasheet Linear Technology LT3485-3

ManufacturerLinear Technology

Photoflash Capacitor Chargers with Output Voltage Monitor and Integrated IGBT Drive


  • Download » Datasheet PDF, 352 Kb, Revision: B, File uploaded: Sep 18, 2017
    LT3485-0/LT3485-1/LT3485-2/LT3485-3 - Photoflash Capacitor Chargers with Output Voltage Monitor and Integrated IGBT Drive
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    Photoflash Capacitor
    Chargers with Output Voltage
    Monitor and Integrated IGBT Drive U DESCRIPTIO FEATURES The LTВ®3485 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. Integrated IGBT Driver
    Voltage Output Monitor
    Uses Small Transformers: 5.8mm Г— 5.8mm Г— 3mm
    Operates from Two AA Batteries, Single Cell Li-Ion
    or Any Supply from 1.8V up to 10V ...



Package3x3 DFN-10
Package Outline Drawing
3x3 DFN-10
Package Outline Drawing
Package CodeDDDD
Package Index05-08-169905-08-1699
Pin Count1010


Demo BoardsDC895A-A,DC895A-B,DC895A-CDC895A-A,DC895A-B,DC895A-C
Design ToolsLTspice FileLTspice File
Export Controlnono
Integrated Inductornono
Ishutdown, µA11
Isupply, mA55
Number of Outputs11
Operating Temperature Range, °C0 to 850 to 85
Switch Current, A1.71.7
TopologyFlyback, PhotoflashFlyback, Photoflash
Vin Max, V1010
Vin Min, V1.81.8

Eco Plan


Other Options

LT3485-0 LT3485-1 LT3485-2


  • Download » Articles - LT Journal PDF, 350 Kb, File published: Mar 28, 2006
    Photoflash Capacitor Chargers Keep Up with Shrinking Cameras
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    DESIGN FEATURES Photoflash Capacitor Chargers
    Keep Up with Shrinking Cameras
    by Mike Negrete Introduction
    Camera-phones have come a long way
    since the п¬Ѓrst generation of integrated
    cameras offered low-resolution CMOS
    images through the eye of a plastic
    lens. Now PDAs and high-end cell
    phones include high quality cameras
    with 2 megapixel resolutions and glass
    optics. Since these devices are carried
    by most users at all times, size is of the
    utmost importance. LED flashes were
    introduced in early model cell phone
    cameras, but they cannot produce
    enough light and lack the spectral
    quality required for higher-end cameras. Although xenon flashes are an
    optimal source of light for photography, they required substantially more
    board space than LED flashes until
    7 6 LT3484-1 5 LT3484-2 4
    3 2 LT3484-0 1 0 2 3 4 5 ...

Moldel Line

Series: LT3485-3 (2)

Manufacturer's Classification

  • Power Management > Switching Regulator > Xenon Photoflash Charger

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