LT3468 - Photoflash Capacitor Chargers in ThinSOT

Features

  • Click Here For LT3468 Evaluation Kits
  • Highly Integrated IC Reduces Solution Size
  • Uses Small Transformers:
    5.8mm x 5.8mm x 3mm
  • Fast Photoflash Charge Times:
    4.6s for LT3468 (0V to 320V, 100µF, VIN = 3.6V)
    5.7s for LT3468-2 (0V to 320V, 100µF, VIN = 3.6V)
    5.5s for LT3468-1 (0V to 320V, 50µF, VIN = 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

Typical Application

LT3468
LT3468
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Description

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.

*Protected by U.S. Patents, including 6518733.

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Packaging

ThinSOT

LT3468
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Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT3468ES5 SOT 5 E $2.86   View
LT3468ES5#TR SOT 5 E $2.86 $2.01 View
LT3468ES5#TRM SOT 5 E $2.86 $2.03 View
LT3468ES5#TRMPBF SOT 5 E $2.86 $2.03 View
LT3468ES5#TRPBF SOT 5 E $2.86 $2.01 View
LT3468ES5-1 SOT 5 E $2.86   View
LT3468ES5-1#TRMPBF SOT 5 E $2.86 $2.03 View
LT3468ES5-1#TRPBF SOT 5 E $2.86 $2.01 View
LT3468ES5-2 SOT 5 E $2.86   View
LT3468ES5-2#TRMPBF SOT 5 E $2.86 $2.03 View
LT3468ES5-2#TRPBF SOT 5 E $2.86 $2.01 View
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* 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 Linear Technology sales office or authorized distributor.

Evaluation Kits

Part Number Description Price
DC711A-A LT3468ES5 | Photoflash Capacitor Charger High Voltage Supply, Vin = 2.5V-8V, Vout = 320V, ISW - PK = 1.4A $125.00
DC711A-B LT3468ES5-1 | Photoflash Capacitor Charger High Voltage Supply, Vin = 2.5V-8V, Vout = 320V, ISW - PK = 0.7A $125.00
DC711A-C LT3468ES5-2 | Photoflash Capacitor Charger High Voltage Supply, Vin = 2.5V-8V, Vout = 320V, ISW - PK = 1.0A $125.00
DC661A-A LT3468ES5 | Photoflash Capacitor Charger High Voltage Supply, 2.8V to 8Vin, 320Vout $125.00
DC661A-B LT3468ES5-1 | Photoflash Capacitor Charger High Voltage Supply, 2.8V to 8Vin, 320Vout $125.00
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Applications

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

To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

For other simulation tools, visit our Design Simulation and Device Models page.

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