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UC3572 Status: ACTIVE

Negative Output Flyback Pulse Width Modulator


      
         
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 UC2572 
TopologyFlyback  
Vin(Min)(V)4.2  
Vin(Max)(V)35  
Vout(Min)(V)-70  
Vout(Max)(V)-1  
Regulated Outputs(#)1  
Iout(Max)(A)0.5  
Switching Frequency(Max)(kHz)300  
Iq(Typ)(mA)9  
Pin/Package8PDIP, 8SOIC  
Thermal ShutdownNo  
RatingCatalog  
Duty Cycle(Max)(%)100  
 Samples
 Inventory

Other qualified versions of UC3572

Version Part Number Definition
Military UC1572 QML certified for Military and Defense Applications

Product Information

Features

  • Simple Single Inductor Flyback PWM for Negative Voltage Generation
  • Drives External PMOS Switch
  • Contains UVLO Circuit
  • Includes Pulse-by-Pulse Current Limit
  • Low 50uA Sleep Mode Current

Description

The UC3572 is a negative output flyback pulse width modulator which converts a positive input voltage to a regulated negative output voltage. The chip is optimized for use in a single inductor negative flyback switching converter employing an external PMOS switch. The block diagram consists of a precision reference, an error amplifier configured for voltage mode operation, an oscillator, a PWM comparator with latching logic, and a 0.5A peak gate driver. The UC3572 includes an undervoltage lockout circuit to insure sufficient input supply voltage is present before any switching activity can occur, and a pulse-by-pulse current limit. Output current can be sensed and limited to a user determined maximum value. The UVLO circuit turns the chip off when the input voltage is below the UVLO threshold. In addition, a sleep comparator interfaces to the UVLO circuit to turn the chip off. This reduces the supply current to only 50uA, making the UC3572 ideal for battery powered applications.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
UC3572DACTIVE0 to 701.20 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3572DG4ACTIVE0 to 701.20 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3572DTRACTIVE0 to 701.15 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC3572DTRG4ACTIVE0 to 701.15 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC3572NACTIVE0 to 701.20 | 1kuPDIP (P) | 8 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3572NG4ACTIVE0 to 701.20 | 1kuPDIP (P) | 8 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint

* 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

Reported Distributor Inventory as of 9:49 AM GMT, 08 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 4 WeeksUC3572D
AmericasArrow >1k
Avnet >1k
Rochester Electronics >1k
AsiaFarnell Asia 284
WPI 95
EuropeAvnet-SILICA 75
Farnell 284
WorldwideDigiKey >1k
TI Lead Time*: 4 WeeksUC3572DG4
AmericasRochester Electronics 215
WorldwideDigiKey  Available
TI Lead Time*: 4 WeeksUC3572DTR
AmericasRochester Electronics >1k
WorldwideDigiKey  Available
TI Lead Time*: 4 WeeksUC3572DTRG4
WorldwideDigiKey  Available
TI Lead Time*: 1 WeekUC3572N
AmericasRochester Electronics >1k
WorldwideDigiKey 158
TI Lead Time*: 1 WeekUC3572NG4
WorldwideDigiKey  Available
View all Distributors  

** 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
UC3572D RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3572DG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3572DTR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3572DTRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3572N RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView
UC3572NG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView

* 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

Most useful technical documents for UC3572 Help

Datasheet

Reference Designs

Description Part # Company
Hot Swap, Push-Pull, Sync. Buck, Negative Flyback, Dual Sync. Buck Reference Design PMP156 Texas Instruments
Negative Flyback Converter PMP191 Texas Instruments
Negative Flyback with Vin 12 V and Vout -12 V at 1A PMP303 Texas Instruments
SEPIC, Negative Flyback, Two Sync. Buck with Vin 3.3 V and Vout 5 V, 3.3 V, 1.8 V and -5 V PMP01-006-1217 Texas Instruments
Synchronous Buck Reference Design PMP354 Texas Instruments

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