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MAX8685A, MAX8685C, MAX8685D, MAX8685F

Xenon Photoflash Charger with IGBT Driver and Voltage Monitor

Fastest Charge-Time Photoflash Capacitor Charger with Voltage Monitor

Product Details

Key Features

Simplified Block Diagram

Technical Docs

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Key Features

  • 2s to Charge 100µF to 300V
  • Integrated IGBT Driver
  • Voltage-Monitor Output*
  • Short-/Open-Circuit Protection
  • Controlled Inrush Current
  • Programmable Input Current Limit Up to 2A (MAX8685A) or 2.6A (MAX8685F)*
  • Programmable Input Voltage-Overload Protection*
  • Extended Battery Life with Input-Voltage Monitoring*
  • Internal 2.6A Switch
  • Robust Architecture Allows Use of Low-Cost Transformers
  • High Accuracy Not Dependent on Transformer Turns Ratio
  • Automatic Refresh Mode Draws Minimal Quiescent Current
  • Charge-Done Indicator
  • 3mm x 3mm, 14-Pin TDFN Package (MAX8685A/MAX8685F)
  • 2mm x 3mm, 8-Pin TDFN Package (MAX8685C/MAX8685D)

Applications/Uses

  • Cell-Phone Cameras
  • Digital Cameras
  • Film Cameras
  • Personal Media Players

Description

The MAX8685 family charges high-voltage photoflash capacitors quickly, while limiting peak drain from the battery, through an efficient flyback switching regulator. The internal n-channel MOSFET improves efficiency over competing bipolar designs by lowering switch-voltage dropout. An integrated insulated gate bipolar transistor (IGBT) driver enables flash discharge and reduces external component count. The device includes an open-drain active-low DONE output to indicate when the photoflash voltage has reached regulation. The device automatically refreshes the output voltage every 16s, thus efficiently maintains the capacitor charge level with minimum battery drain.

The MAX8685A/MAX8685F feature an undervoltage input (UVI) monitor. UVI monitors the supply voltage and suspends switching if the input voltage drops below a programmed threshold. The MAX8685A/MAX8685F also feature a voltage-monitor output that provides a scaled replica of the output voltage. The voltage-monitor output is used for interfacing with a microprocessor's internal A/D converter to assist in implementing red-eye reduction.

The MAX8685C/MAX8685D, with fixed peak-primary current limits of 1A and 1.6A, respectively, are offered in a 2mm x 3mm, 8-pin TDFN package. The MAX8685A/MAX8685F, with resistor-programmable current limits of up to 2A (max) and 2.6A (max), respectively, are offered in a 3mm x 3mm, 14-pin TDFN package. All devices operate over the -40°C to +85°C temperature range.

Simplified Block Diagram

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.