MAX8685A

Xenon Photoflash Charger with IGBT Driver and Voltage Monitor

Fastest Charge-Time Photoflash Capacitor Charger with Voltage Monitor

Data Sheet (Rev. 4)
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Overview

  • 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)

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.

Applications

  • Cell-Phone Cameras
  • Digital Cameras
  • Film Cameras
  • Personal Media Players
MAX8685A
Xenon Photoflash Charger with IGBT Driver and Voltage Monitor
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Documentation

Data Sheet 1

Reliability Data 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Switching Regulators & Controllers 3
MAX8622
Fast-Charge-Time Xenon Flash Charger for Digital Still Cameras and Camera Phones
MAX1567
Obsolete Six-Channel, High-Efficiency, Digital Camera Power Supplies
MAX8614
PRODUCTION Dual-Output (+ and -) DC-DC Converters for CCD
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Evaluation Kits

MAX8685CEVKIT

Evaluation Kit for the MAX8685C

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Features and Benefits

  • Charges 35µF to 300V
  • EV Kit Includes Xenon Flash Tube, IGBT, and Trigger Transformer
  • No Inrush Current
  • Short-Circuit Protection
  • 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
  • Fully Assembled and Tested

Product Details

The MAX8685C evaluation kit (EV kit) is a fully assembled and tested printed-circuit board (PCB) for evaluating the MAX8685C/MAX8685D xenon flash charger family. The MAX8685C EV kit operates from a 2.5V to 5.5V supply and charges a 35µF capacitor to 300V. Battery voltages as low as 1.5V can be used to supply the inductor primary current. The MAX8685C/MAX8685D offer fixed peak primary current limits of 1A and 1.6A, respectively. An LED indicator on the EV kit lights up when the initial charging cycle is complete.

Applications

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

MAX8685AEVKIT

Evaluation Kit for the MAX8685A

Buy Now View Details

Features and Benefits

  • Charges 35µF to 300V
  • EV Kit Includes Xenon Flash Tube, IGBT, and Trigger Transformer
  • Voltage-Monitor Output
  • No Inrush Current
  • Short-Circuit Protection
  • Programmable Input Current Limit Up to 2A
  • Programmable Input Voltage-Overload Protection
  • 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
  • Fully Assembled and Tested

Product Details

The MAX8685A evaluation kit (EV kit) is a fully assembled and tested printed-circuit board (PCB) for evaluating the MAX8685A xenon flash charger. The MAX8685A EV kit operates from a 2.5V to 5.5V supply and charges a 35µF capacitor to 300V. Battery voltages as a low as 1.5V can be used to supply the inductor primary current. The MAX8685A features an undervoltage input monitor (UVI). UVI monitors the battery voltage and suspends switching if the input voltage drops below a programmed threshold. The MAX8685A also features a voltage-monitor output that provides a scaled replica of the output voltage. The current limit on the MAX8685A EV kit is set to 2A (2.6A for the MAX8685F), and is easily adjusted by adding a resistor. An LED indicator on the EV kit lights up when the initial charging cycle is complete.

Applications

  • Cell-Phone Cameras
  • Digital Cameras
  • Film Cameras
  • Personal Media Players
MAX8685CEVKIT
Evaluation Kit for the MAX8685C
MAX8685AEVKIT
Evaluation Kit for the MAX8685A

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