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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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Data Sheet
FULL DATA SHEET (PDF, 328kB)
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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 (min) (V) VIN (max) (V) Topology Features Control Loop Feedback Type Frequency (kHz) Max. Duty Cycle (%) Start-Up Current (max) (mA) Operating Current, ICC (max) (mA) Gate Drive Current (A) Operating Temp. Range (°C) Price**
    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     		1,250 50
    75     		0.09 2.5 1 -40 to +125 $1.28 @ 1k
    See All Isolated Power Supplies (29)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

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

    Evaluation Kits
    none

    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
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX5068AAUE    
    		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    
    		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+  
    		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    
    		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+  
    		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    
    		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+  
    		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    
    		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+  
    		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    
    		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+  
    		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+  
    		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    
    		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    
    		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    
    		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    
    		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    
    		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
    MAX5068DAUE    
    		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    
    		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    
    		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    
    		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
    MAX5068DAUE-T    
    		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-T    
    		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+T    
    		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

    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: 2008-03-13


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