UC2577-ADJ Status: ACTIVE

Simple Step-Up Voltage Regulator

      
         
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Datasheet

Download - PDF Icon
  • UC2577-ADJ: Simple Step-Up Voltage Regulators (Rev. A) (uc2577-adj.pdf, 655 KB)
    16 May 2003 Download

 UC2577-ADJ
Iout(Max)(A)3  
Iq(Typ)(mA)45  
Vin(Min)(V)3  
Vin(Max)(V)40  
Vout(Min)(V)5  
Vout(Max)(V)60  
Switching Frequency(Max)(kHz)52  
Regulated Outputs(#)1  
Duty Cycle(Max)(%)100  
Operating Temp Range(Celsius)-40 to 125,-40 to 85  
Pin/Package5DDPAK/TO-263,5TO-220  
 Samples
 Inventory

Customers Who Evaluated This Product Also Evaluated

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  • TPS61087: 18.5V, 3.2A, 650kHz, 1.2MHz Step-Up DC-DC Converter
  • MC33063A: 1.5-A Peak Boost/Buck/Inverting Switching Regulator
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  • TPS40210: Wide Input Range Current Mode Boost Controller

Product Information

Features

  • Requires Few External Components
  • NPN Output Switches 3.0A, 65V(max)
  • Extended Input Voltage Range: 3.0V to 40V
  • Current Mode Operation for Improved Transient Response, Line Regulation, and Current Limiting
  • Soft Start Function Provides Controlled Startup
  • 52kHz Internal Oscillator
  • Output Switch Protected by Current Limit, Undervoltage Lockout and Thermal Shutdown
  • Improved Replacement for LM2577-ADJ Series
  • TYPICAL APPLICATIONS
    • Simple Boost and Flyback Converters
    • SEPIC Topology Permits Input Voltage to be Higher or Lower than Output Voltage
    • Transformer Coupled Forward Regulators
    • Multiple Output Designs

Description

The UC2577-ADJ device provides all the active functions necessary to implement step-up (boost), flyback, and forward converter switching regulators. Requiring only a few components, these simple regulators efficiently provide up to 60V as a step-up regulator, and even higher voltages as a flyback or forward converter regulator.

The UC2577-ADJ features a wide input voltage range of 3.0V to 40V and an adjustable output voltage. An on-chip 3.0A NPN switch is included with undervoltage lockout, thermal protection circuitry, and current limiting, as well as soft start mode operation to reduce current during startup. Other features include a 52kHz fixed frequency on-chip oscillator with no external components and current mode control for better line and load regulation.

A standard series of inductors and capacitors are available from several manufacturers optimized for use with these regulators and are listed in this data sheet.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Replaced ByPrice | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
UC2577T-ADJACTIVE-40 to 125 8.15 | 100uTO-220 (KC) | 5 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC2577T-ADJG3ACTIVE-40 to 125 8.15 | 100uTO-220 (KC) | 5 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC2577TD-ADJOBSOLETE-40 to 125UC2577TDKTTT-ADJ DDPAK/TO-263 (KTT) | 5 View   Download CAD Format for this Symbol Replaced by UC2577TDKTTT-ADJ
UC2577TDKTTT-ADJACTIVE-40 to 85 8.15 | 100uDDPAK/TO-263 (KTT) | 5 View 50 | SMALL T&R Download CAD Format for this Symbol 
UC2577TDKTTT-ADJG3ACTIVE-40 to 85 8.15 | 100uDDPAK/TO-263 (KTT) | 5 View 50 | SMALL T&R Download CAD Format for this Symbol 
UC2577TDTR-ADJACTIVE-40 to 125 8.15 | 100uDDPAK/TO-263 (KTT) | 5 View 500 | LARGE T&R Download CAD Format for this Symbol Purchase Samples
UC2577TDTR-ADJG3ACTIVE-40 to 125 8.15 | 100uDDPAK/TO-263 (KTT) | 5 View 500 | LARGE T&R Download CAD Format for this Symbol Purchase Samples

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

  TI Inventory Status Reported Distributor Inventory
UC2577T-ADJAs of 8:50 AM GMT, 04 Dec 2008As of 8:50 AM GMT, 04 Dec 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 3650 | 10 Dec 4 Weeks AmericasDigiKey 158
 303 | 12 Dec Mouser Electronics 31
 5046 | 6 Feb Newark 50
 5028 | 12 Feb Rochester Electronics >1k
UC2577T-ADJG3As of 8:50 AM GMT, 04 Dec 2008As of 8:50 AM GMT, 04 Dec 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 3650 | 10 Dec 4 Weeks AmericasMouser Electronics 37
 303 | 12 Dec     
 5046 | 6 Feb     
 5028 | 12 Feb     
UC2577TDKTTT-ADJAs of 8:50 AM GMT, 04 Dec 2008As of 8:50 AM GMT, 04 Dec 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 4850 | 11 Dec 4 Weeks AmericasArrow 50
 163 | 22 Dec DigiKey 161
 >10k | 5 Feb Newark 3
  Rochester Electronics 950
UC2577TDKTTT-ADJG3As of 8:50 AM GMT, 04 Dec 2008As of 8:50 AM GMT, 04 Dec 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 4850 | 11 Dec 4 Weeks None Reported
View Distributors
   
 163 | 22 Dec     
 >10k | 5 Feb     
UC2577TDTR-ADJAs of 8:50 AM GMT, 04 Dec 2008As of 8:50 AM GMT, 04 Dec 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 1000 | 11 Dec 4 Weeks AmericasRochester Electronics >1k
 543 | 22 Dec     
 >10k | 2 Feb     
UC2577TDTR-ADJG3As of 8:50 AM GMT, 04 Dec 2008As of 8:50 AM GMT, 04 Dec 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 1000 | 11 Dec 4 Weeks None Reported
View Distributors
   
 543 | 22 Dec     
 >10k | 2 Feb     
View all Distributors  

* Our information is updated daily, so please check back with us soon if this does not meet your needs. You may also contact your TI Authorized Distributor , including those listed above, for real time stock information.

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

 Product ContentDPPM / MTBF / FIT Rate
DeviceEco Plan* Lead / Ball FinishMSL Rating / Peak ReflowDetailsDetails
UC2577T-ADJ RoHS Compliant Green (RoHS & no Sb/Br) CU SN N/A for Pkg TypeViewView
UC2577T-ADJG3 RoHS Compliant Green (RoHS & no Sb/Br) CU SN N/A for Pkg TypeViewView
UC2577TDKTTT-ADJ RoHS Compliant Green (RoHS & no Sb/Br) CU SN Level-2-260C-1 YEARViewView
UC2577TDKTTT-ADJG3 RoHS Compliant Green (RoHS & no Sb/Br) CU SN Level-2-260C-1 YEARViewView
UC2577TDTR-ADJ RoHS Compliant Green (RoHS & no Sb/Br) CU SN Level-2-260C-1 YEARViewView
UC2577TDTR-ADJG3 RoHS Compliant Green (RoHS & no Sb/Br) CU SN Level-2-260C-1 YEARViewView

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Datasheets

  • UC2577-ADJ: Simple Step-Up Voltage Regulators (Rev. A) (uc2577-adj.pdf, 655 KB)
    16 May 2003 Download

Application Notes

  • DN-49 UC2577 Controls SEPIC Converter for Automotive Applications (slua181.htm, 8 KB)
    05 Sep 1999 Abstract
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Customers Who Evaluated This Product Also Evaluated...
Part #NameProduct FamilyComments
MC33063A1.5-A Peak Boost/Buck/Inverting Switching RegulatorDC/DC CONVERTERS (INTEGRATED SWITCH)-INVERTING REGULATORSTI customers also evaluated this product.
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