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MAX5068
High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator

1.25MHz, Universal-Input, Current-Mode PWM Controller with Precision-Programmable Switching Frequency and Start/Stop Voltage


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 328kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX5068 is a high-frequency, current-mode, pulse-width modulation (PWM) controller that integrates all the building blocks necessary for implementing AC-DC or DC-DC fixed-frequency power supplies. Isolated or nonisolated power supplies are easily constructed using either primary- or secondary-side regulation. Current-mode control with leading-edge blanking simplifies control-loop design, and a programmable internal slope-compensation circuit stabilizes the current loop when operating at duty cycles above 50%. The MAX5068A/B limit the maximum duty cycle to 50% for use in single-ended forward converters. The MAX5068C/D/E/F allow duty cycles up to 75%. The MAX5068 features an accurate externally programmable oscillator that simplifies system design.

An input undervoltage lockout (UVLO) programs the input-supply startup voltage and ensures proper operation during brownout conditions.

A single external resistor programs the output switching frequency from 12.5kHz to 1.25MHz. The MAX5068A/B/C/E provide a SYNC input for synchronization to an external clock. The maximum FET-driver duty cycle is 50% for the MAX5068A/B and 75% for the MAX5068C/D/E/F. Programmable hiccup current limit provides additional protection under severe faults.

The MAX5068 is specified over the -40°C to +125°C automotive temperature range and is available in a 16-pin thermally enhanced TSSOP-EP package. Refer to the MAX5069 data sheet for dual FET-driver applications.

Warning: The MAX5068 is designed to work with high voltages. Exercise caution.

Key Features   Applications/Uses
  • Current-Mode Control with 47µA (typ) Startup Current
  • Resistor-Programmable ±4.5% Accurate Switching Frequency:
    • 25kHz to 1.25MHz (MAX5068A/B)
    • 12.5kHz to 625kHz (MAX5068C/D/E/F)
  • Rectified 85VAC to 265VAC or 36VDC to 72VDC Input (MAX5068A/C/D)
  • Input Directly Driven from 10.8V to 24V (MAX5068B/E/F)
  • Frequency Synchronization Input (MAX5068A/B/C/E)
  • Programmable Dead Time and Slope Compensation
  • Programmable Startup Voltage (UVLO)
  • Programmable UVLO Hysteresis (MAX5068A/B/D/F)
  • Integrating Fault Protection (Hiccup)
  • -40°C to +125°C Automotive Temperature Range
  • 16-Pin Thermally Enhanced TSSOP-EP Package

 
  		• Industrial Power Conversion
  		• Isolated Telecom Power Supplies
  		• Networking System Power Supplies
  		• Server Power Supplies
  		• Universal-Input AC Power Supplies

    Key Specifications:  Isolated Power Supplies
    Part Number VIN
    (V)    		 VIN
    (V)    		 Topology Features Cntrl. Loop Feedback Freq.
    (kHz)    		 Duty Cycle
    (%)    		 ISTARTUP
    (mA)    		 ICC
    (mA)    		 Gate Drive Current
    (A)    		 Oper. Temp.
    (°C)    		 Price
    min max min max max max max See Notes
    MAX5068  10.8 24
    Flyback
    Single-Ended Forward
    Adjustable Frequency
    High Voltage Start-Up Circuit
    Internal Error Amplifier
    Synchronizable Freqeuncy
    Thermal Shutdown
    UVLO
    		 Current Mode
    Linear
    Opto
    		 1250
    50
    75
    		 0.09 2.5 1 -40 to +125 $1.28 @1k
    See All Isolated Power Supplies (31)

    Diagram
    MAX5068: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 3983: Designing Single-Switch, Resonant-Reset, Forward Converters - MAX5068

    Reliability Reports
  		• 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: 1-24 of 24

    MAX5068 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX5068AAUE    
    		Active TSSOP-EP;16 pin;33 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0120 (PDF)
    Use pkgcode/variation: U16E-3*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5068BAUE    
    		Active TSSOP-EP;16 pin;33 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0120 (PDF)
    Use pkgcode/variation: U16E-3*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5068BAUE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX5068CAUE    
    		Active TSSOP-EP;16 pin;33 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0120 (PDF)
    Use pkgcode/variation: U16E-3*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5068CAUE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX5068DAUE    
    		Active TSSOP-EP;16 pin;33 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0120 (PDF)
    Use pkgcode/variation: U16E-3*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5068EAUE    
    		Active TSSOP-EP;16 pin;33 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0120 (PDF)
    Use pkgcode/variation: U16E-3*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5068FAUE    
    		Active TSSOP-EP;16 pin;33 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0120 (PDF)
    Use pkgcode/variation: U16E-3*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5068AAUE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX5068DAUE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX5068EAUE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX5068FAUE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX5068AAUE+  
    		Active TSSOP-EP;16 pin;33 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0120 (PDF)
    Use pkgcode/variation: U16E+3*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5068AAUE+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX5068BAUE+  
    		Active TSSOP-EP;16 pin;33 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0120 (PDF)
    Use pkgcode/variation: U16E+3*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5068BAUE+T    
    		Active TSSOP-EP;16 pin;33 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0120 (PDF)
    Use pkgcode/variation: U16E+3*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5068CAUE+  
    		Active TSSOP-EP;16 pin;33 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0120 (PDF)
    Use pkgcode/variation: U16E+3*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5068CAUE+T    
    		Active TSSOP-EP;16 pin;33 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0120 (PDF)
    Use pkgcode/variation: U16E+3*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5068DAUE+  
    		Active TSSOP-EP;16 pin;33 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0120 (PDF)
    Use pkgcode/variation: U16E+3*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5068DAUE+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX5068EAUE+  
    		Active TSSOP-EP;16 pin;33 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0120 (PDF)
    Use pkgcode/variation: U16E+3*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5068EAUE+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX5068FAUE+  
    		Active TSSOP-EP;16 pin;33 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0120 (PDF)
    Use pkgcode/variation: U16E+3*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5068FAUE+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet

    More Information
  		• New Product Press Release 2004-01-30 
  		• Product Ad: MAX5068

    Related Products
    MAX5069 High-Frequency, Current-Mode PWM Controller with Accurate Oscillator and Dual FET Drivers
    MAX5021, MAX5022 Current-Mode PWM Controllers for Isolated Power Supplies
    MAX5052, MAX5052A, MAX5052B, MAX5053, MAX5053A, MAX5053B Current-Mode PWM Controllers with an Error Amplifier for Isolated/Nonisolated Power Supplies

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    Document Ref.: 19-3176; Rev 1; 2004-08-02
    This page last modified: 2009-10-08


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