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UC2572 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

Customers Who Evaluated This Product Also Evaluated

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  • TL5001A: PWM Controller with Wide Input Voltage Range
  • TPS43000: Multi-Topology (buck, boost, sepic) High Frequency DC/DC Controller
  • TL497A: 500-mA Peak Step-Up, Step-Down, Inverting Switching Voltage Regulator
  • TPS5430: 5.5V to 36V, 3A, 500kHz Step Down SWIFT™ Converter
  • UC3886: Average Current Mode PWM Controller IC

More Related Products

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
UC2572DACTIVE-40 to 851.30 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC2572DG4ACTIVE-40 to 851.30 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC2572DTRACTIVE-40 to 851.30 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2572DTRG4ACTIVE-40 to 851.30 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2572NACTIVE-40 to 851.30 | 1kuPDIP (P) | 8 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC2572NG4ACTIVE-40 to 851.30 | 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 9:50 AM GMT, 08 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 4 WeeksUC2572D
AmericasArrow 399
Avnet 57
AsiaWPI 67
EuropeAvnet-SILICA 150
EBV Elektronik 75
WorldwideDigiKey 533
Mouser Electronics 60
TI Lead Time*: 4 WeeksUC2572DG4
AmericasRochester Electronics 50
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC2572DTR
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC2572DTRG4
WorldwideDigiKey  Available
TI Lead Time*: 4 WeeksUC2572N
AmericasAvnet 10
Newark 187
AsiaFarnell Asia 187
WorldwideDigiKey 121
Mouser Electronics 150
TI Lead Time*: 4 WeeksUC2572NG4
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
UC2572D RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2572DG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2572DTR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2572DTRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2572N RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView
UC2572NG4 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 UC2572 Help

Datasheet

Application Notes

View Application Notes for DC/DC Controllers (External Switch)

User Guides

View User Guides for DC/DC Controllers (External Switch)

Reference Designs

Description Part # Company
Hot Swap, Push-Pull, Sync. Buck, Negative Flyback, Dual Sync. Buck Reference Design PMP156 Texas Instruments

Customers Who Evaluated This Product Also Evaluated...
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TL5001A PWM Controller with Wide Input Voltage Range NON-ISOLATED SWITCHING DC/DC REGULATORS-DC/DC CONTROLLERS (EXTERNAL SWITCH) TI customers also evaluated this product.
TPS43000 Multi-Topology (buck, boost, sepic) High Frequency DC/DC Controller NON-ISOLATED SWITCHING DC/DC REGULATORS-DC/DC CONTROLLERS (EXTERNAL SWITCH) TI customers also evaluated this product.
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TL497A 500-mA Peak Step-Up, Step-Down, Inverting Switching Voltage Regulator DC/DC CONVERTERS (INTEGRATED SWITCH)-INVERTING REGULATORS TI customers also evaluated this product.
TPS5430 5.5V to 36V, 3A, 500kHz Step Down SWIFT™ Converter DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS TI customers also evaluated this product.
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