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Maxim > Products > [Power and Battery Management] 
MAX5070, MAX5071
High-Performance, Single-Ended, Current-Mode PWM Controllers

1MHz, Single-Ended, Current-Mode PWM Controllers Pin Compatible with UC2842/UC2844 Series


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 376kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX5070/MAX5071 BiCMOS, high-performance, current-mode PWM controllers have all the features required for wide input voltage range isolated/nonisolated power supplies. These controllers are used for low- and high-power universal input voltage and telecom power supplies.

The MAX5070/MAX5071 contain a fast comparator with only 60ns typical delay from current sense to the output for overcurrent protection. The MAX5070A/MAX5070B have an integrated error amplifier with the output at COMP. Soft-start is achieved by controlling the COMP voltage rise using external components.

The frequency is adjustable from 20kHz to 1MHz with an external resistor and capacitor. The timing capacitor discharge current is trimmed allowing for programmable dead time and maximum duty cycle for a given frequency. The available saw-toothed waveform at RTCT can be used for slope compensation when needed.

The MAX5071A/MAX5071B include a bidirectional synchronization circuit allowing for multiple controllers to run at the same frequency to avoid beat frequencies. Synchronization is accomplished by simply connecting the SYNC pins of all devices together. When synchronizing with other devices, the MAX5071A/MAX5071B with the highest frequency synchronizes the other devices. Alternatively, the MAX5071A/MAX5071B can be synchronized to an external clock with an opendrain output stage running at a higher frequency.

The MAX5071C provides a clock output pulse (ADV_CLK) that leads the driver output (OUT) by 110ns. The advanced clock signal is used to drive the secondary-side synchronous rectifiers.

The MAX5070/MAX5071 are available in 8-pin µMAX® and SO packages and operate over the automotive temperature range of -40°C to +125°C.

Key Features   Applications/Uses
  • Pin-for-Pin Replacement for UC2842 (MAX5070A) and UC2844 (MAX5070B)
  • 2A Drive Source and 1A Sink Capability
  • Up to 1MHz Switching Frequency Operation
  • Bidirectional Synchronization (MAX5071A/MAX5071B)
  • Advanced Output Drive for Secondary-Side Synchronous Rectification (MAX5071C)
  • Fast 60ns Cycle-by-Cycle Current Limit
  • Trimmed Oscillator Capacitor Discharge Current Sets Maximum Duty Cycle Accurately
  • Accurate 5% Start and Stop Voltage with 6V Hysteresis
  • Low 32µA Startup Current
  • 5V Regulator Output (VREF) with 20mA Capability
  • Overtemperature Shutdown

 
  		• Computer Systems/Servers
  		• Industrial Power Conversion
  		• Isolated Keep-Alive Circuits
  		• Isolated Power Supplies
  		• Isolated Telecom Power Supplies
  		• Networking Systems
  		• Universal Input AC/DC 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
    MAX5070  11 26.5
    Flyback
    Single-Ended Forward
    Adjustable Frequency
    High Voltage Start-Up Circuit
    Internal Error Amplifier
    Thermal Shutdown
    UVLO
    		 Current Mode
    Linear
    Opto
    		 1000
    50
    100
    		 0.032 3 2 -40 to +125 $0.64 @1k
    MAX5071  Single-Ended Forward
    Adjustable Frequency
    High Voltage Start-Up Circuit
    Internal Error Amplifier
    Synchronizable Freqeuncy
    Synchronous Rectifier Driver
    Thermal Shutdown
    UVLO
    		 $0.64 @1k
    See All Isolated Power Supplies (31)

    Diagram
    MAX5070: Pin Configuration
    Pin Configuration

    MAX5071: Pin Configuration
    Pin Configuration

    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: 1-40 of 40

    MAX5070 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX5070AASA    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-4*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5070AASA-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX5070BASA    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-4*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5070BASA-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX5070AASA+  
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5070AASA+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX5070BASA+  
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5070BASA+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX5070AAUA    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5070AAUA-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX5070BAUA    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5070BAUA-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX5070AAUA+  
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5070AAUA+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX5070BAUA+  
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5070BAUA+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX5071 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX5071AASA    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5071AASA+  
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5071AASA+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX5071AASA-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX5071BASA    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5071BASA+  
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5071BASA+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX5071BASA-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX5071CASA    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5071CASA+  
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5071CASA+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX5071CASA-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX5071BAUA+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX5071BAUA+    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5071AAUA+T    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5071AAUA+  
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5071CAUA+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX5071CAUA+  
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5071AAUA    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5071AAUA-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX5071BAUA    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5071BAUA-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX5071CAUA    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5071CAUA-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet

    More Information
  		• New Product Press Release 2004-05-03 
  		• Product Ad: MAX5071

    Related Products
    MAX5068 High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator
    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.: 19-3283; Rev 3; 2006-10-23
    This page last modified: 2009-10-12


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