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Maxim > Products > [Power and Battery Management] 
MAX8685A, MAX8685C, MAX8685D, MAX8685F
Xenon Photoflash Charger with IGBT Driver and Voltage Monitor

Fastest Charge-Time Photoflash Capacitor Charger with Voltage Monitor


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Status
Active: In Production.

Description
Request Full Data Sheet
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.

An evaluation kit is available:  MAX8685AEVKIT   MAX8685CEVKIT  

Key Features   Applications/Uses
  • 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)

*MAX8685A/MAX8685F only.

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

    Key Specifications:  Multifunction PMICs
    Part Number Primary Topology Monitor/Control Features DC-DC/Power Features LCD/LED/Flash/CCD Features VIN
    (V)    		 VIN
    (V)    		 VOUT
    (V)    		 VOUT
    (V)    		 Max. IOUT
    (A)    		 Max. IOUT
    (A)    		 Oper. Freq.
    (kHz)    		 Package/Pins Smallest Available Pckg.
    (mm2)    		 Price
    min max min max ≥ ≤ max w/pins See Notes
    MAX8685  Step-Up
    Output OVP
    Shutdown
    Current Limit
    Internal Pwr. FETs
    Soft Start
    IGBT Driver
    Photo Flash
    		 2.5 5.5 1.25 400 0.01 0.01 300
    TDFN-EP/14
    TDFN-EP/8
    		 6 $1.43 @1k
    See All Multifunction PMICs (83)

    Evaluation Kits
  		• MAX8685AEVKIT
  		• MAX8685CEVKIT

    Design Guides
  		• Power Management for Battery-Powered Equipment (PDF)

    Reliability Reports
  		• Reliability Report: MAX8685A.pdf
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-6 of 6

    MAX8685A Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8685AETD+T    
    		Active TDFN-EP;14 pin;10 mm²
    Outline Drawing: 21-0137 (PDF)
    Land Pattern: 90-0063 (PDF)
    Use pkgcode/variation: T1433+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8685C Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8685CETA+T    
    		Active TDFN-EP;8 pin;6 mm²
    Outline Drawing: 21-0174 (PDF)
    Land Pattern: 90-0091 (PDF)
    Use pkgcode/variation: T823+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8685CETA+  
    		Active TDFN-EP;8 pin;6 mm²
    Outline Drawing: 21-0174 (PDF)
    Land Pattern: 90-0091 (PDF)
    Use pkgcode/variation: T823+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8685D Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8685DETA+T    
    		Active TDFN-EP;8 pin;6 mm²
    Outline Drawing: 21-0174 (PDF)
    Land Pattern: 90-0091 (PDF)
    Use pkgcode/variation: T823+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8685F Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8685FEVKIT+    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX8685FETD+T    
    		Active TDFN-EP;14 pin;10 mm²
    Outline Drawing: 21-0137 (PDF)
    Land Pattern: 90-0063 (PDF)
    Use pkgcode/variation: T1433+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• Topmark Coding: MAX8685
  		• New Product Press Release 2008-05-07 

    Related Products
    MAX8622 Fast-Charge-Time Xenon Flash Charger for Digital Still Cameras and Camera Phones
    MAX1566, MAX1567 Six-Channel, High-Efficiency, Digital Camera Power Supplies
    MAX8614A, MAX8614B Dual-Output (+ and -) DC-DC Converters for CCD

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    Document Ref.: 19-0728; Rev 4; 2009-02-25
    This page last modified: 2009-02-25


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