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Maxim > Products > Power and Battery Management 
MAX5021, MAX5022
Current-Mode PWM Controllers for Isolated Power Supplies

SOT23 Universal Off-Line Power Supply Controller


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Data Sheet
FULL DATA SHEET (PDF, 248kB)
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Description
The MAX5021/MAX5022 current-mode PWM controllers contain all the control circuitry required for the design of wide input voltage range isolated power supplies. These devices are well suited for use in universal input (85VAC to 265VAC) off-line or telecom (-36VDC to -72VDC) power supplies.

An undervoltage lockout (UVLO) circuit with large hysteresis coupled with low startup and operating current reduce power dissipation in the startup resistor and allow use of ceramic bypass capacitors. The 262kHz switching frequency is internally trimmed to }12% accuracy; this allows the optimization of the magnetic and filter components resulting in compact, cost-effective power supplies. The MAX5021 with 50% maximum duty cycle and MAX5022 with 75% maximum duty cycle are recommended for forward converters and flyback converters, respectively. The MAX5021/MAX5022 are available in 6-pin SOT23, 8-pin µMAX, and 8-pin DIP packages and are rated for operation over the -40‹C to +85‹C temperature range.

Key Features   Applications/Uses
  • Available in a Tiny 6-Pin SOT23 Package
  • 50µA Typical Startup Current
  • 1.2mA Typical Operating Current
  • Large UVLO Hysteresis of 14V
  • Fixed Switching Frequency of 262kHz ±12%
  • 50% Maximum Duty Cycle Limit (MAX5021)
  • 75% Maximum Duty Cycle Limit (MAX5022)
  • 60ns Cycle-by-Cycle Current-Limit Response Time

 
  		• Isolated Power Supplies
  		• Low-Power Telecom Power Supplies
  		• Mobile Phone Chargers
  		• Standby Power Supplies
  		• Universal Offline Power Supplies

    Key Specifications:   Isolated Power Supplies
    Part Number Application (Nominal Input Voltage) 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) Current Sense Threshold (mV) EV-Kit RoHS Available Package Smallest Available Package (max w/pins) (mm2) Operating Temp. Range (°C) Price**
    MAX5021 
    •Networking (48V)
    •Power Over Ethernet (32-58V)
    •Telecom (36-72V)
    •Universal Off-line (90-240VAC)
    		 24 375 Single-Ended Forward
    •High Voltage Start-Up Circuit
    •Thermal Shutdown
    •UVLO
    		 Current Mode Opto 262 50 0.085 2.43 0.25 600 No Yes PDIP/8
    SOT-23/6
    uMAX/8     		9 -40 to +85 $0.79 @ 1k
    MAX5022  Flyback 75 $0.70 @ 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.

    Diagram
    MAX5021, MAX5022: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 967: How to Minimize Power Dissipation in Li+ Linear Chargers - MAX5021
  		• Application Note 1062: Designing Compact Telecom Power Supplies - MAX5021, MAX5022
  		• Application Note 4033: Programmable Fan Controllers - MAX5021

    Evaluation Kits
  		• MAX5022EVKIT

    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: 1-20 of 20

    MAX5021 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX5021EVKIT  



    		See data sheet
    MAX5021EPA  
    		PDIP;8 pin;82 mm²
    Dwg: 21-0043D (PDF)
    Use pkgcode/variation: P8-5*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5021EUT  
    		SOT-23;6 pin;9 mm²
    Dwg: 21-0058I (PDF)
    Use pkgcode/variation: U6SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5021EUT+  
    		SOT-23;6 pin;9 mm²
    Dwg: 21-0058I (PDF)
    Use pkgcode/variation: U6SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5021EUT-T  
    		SOT-23;6 pin;9 mm²
    Dwg: 21-0058I (PDF)
    Use pkgcode/variation: U6SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5021EUT+T  
    		SOT-23;6 pin;9 mm²
    Dwg: 21-0058I (PDF)
    Use pkgcode/variation: U6SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5021EUA+T  
    		uMAX;8 pin;16 mm²
    Dwg: 21-0036J (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5021EUA+  
    		uMAX;8 pin;16 mm²
    Dwg: 21-0036J (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5021EUA  
    		uMAX;8 pin;16 mm²
    Dwg: 21-0036J (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5021EUA-T  
    		uMAX;8 pin;16 mm²
    Dwg: 21-0036J (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5022 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX5022EPA+  
    		PDIP;8 pin;82 mm²
    Dwg: 21-0043D (PDF)
    Use pkgcode/variation: P8+5*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5022EPA  
    		PDIP;8 pin;82 mm²
    Dwg: 21-0043D (PDF)
    Use pkgcode/variation: P8-5*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5022EUT  
    		SOT-23;6 pin;9 mm²
    Dwg: 21-0058I (PDF)
    Use pkgcode/variation: U6SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5022EUT+  
    		SOT-23;6 pin;9 mm²
    Dwg: 21-0058I (PDF)
    Use pkgcode/variation: U6SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5022EUT+T  
    		SOT-23;6 pin;9 mm²
    Dwg: 21-0058I (PDF)
    Use pkgcode/variation: U6SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5022EUT-T  
    		SOT-23;6 pin;9 mm²
    Dwg: 21-0058I (PDF)
    Use pkgcode/variation: U6SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5022EUA  
    		uMAX;8 pin;16 mm²
    Dwg: 21-0036J (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5022EUA-T  



    		-40°C to +85°C See data sheet
    MAX5022EUA+  
    		uMAX;8 pin;16 mm²
    Dwg: 21-0036J (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5022EUA+T  
    		uMAX;8 pin;16 mm²
    Dwg: 21-0036J (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• Topmark Coding: MAX5021 MAX5022
  		• New Product Press Release 2001-09-27 

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     Description 
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    Document Ref.: 19-2066; Rev 1; 2001-12-24
    This page last modified: 2007-06-25




             


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