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UCC2808A-2 Status: ACTIVE

Low-Power Current-Mode Push-Pull PWM


      
         
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Datasheet

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 UCC2808A-2
TopologyFull-Bridge, Half-Bridge, Push-Pull  
Control MethodCurrent Mode  
Duty Cycle(Max)(%)50  
PWM Outputs(#)2  
Frequency(Max)(kHz)1000  
UVLO Thresholds On/Off(V)4.3/4.1  
Pin/Package8PDIP, 8SOIC, 8TSSOP  
Regulated Outputs(#)2  
 Samples
 Inventory

Customers Who Evaluated This Product Also Evaluated

  • UCC2808A-1: Low-Power Current-Mode Push-Pull PWM
  • UCC3808A-2: Low-Power Current-Mode Push-Pull PWM
  • LM237: 3 Pin 1.5A Adjustable Negative Voltage Regulator

Product Information

Features

  • Dual Output Drive Stages in Push-Pull Configuration
  • Current Sense Discharge Transistor to Improve Dynamic Response
  • 130-µA Typical Starting Current
  • 1-mA Typical Run Current
  • Operation to 1 MHz
  • Internal Soft Start
  • On-Chip Error Amplifier With 2-MHz Gain Bandwidth Product
  • On Chip VDD Clamping
  • Output Drive Stages Capable of 500-mA Peak-Source Current, 1-A Peak-Sink Current

Description

The UCC3808A is a family of BiCMOS push-pull, high-speed, low-power, pulse-width modulators. The UCC3808A contains all of the control and drive circuitry required for off-line or dc-to-dc fixed frequency current-mode switching power supplies with minimal external parts count.

The UCC3808A dual output drive stages are arranged in a push-pull configuration. Both outputs switch at half the oscillator frequency using a toggle flip-flop. The dead time between the two outputs is typically 60 ns to 200 ns depending on the values of the timing capacitor and resistors, thus limiting each output stage duty cycle to less than 50%.

The UCC3808A family offers a variety of package options, temperature range options, and choice of undervoltage lockout levels. The family has UVLO thresholds and hysteresis options for off-line and battery powered systems. Thresholds are shown in the table below.

The UCC3808A is an enhanced version of the UCC3808 family. The significant difference is that the A versions feature an internal discharge transistor from the CS pin to ground, which is activated each clock cycle during the oscillator dead time. The feature discharges any filter capacitance on the CS pin during each cycle and helps minimize filter capacitor values and current sense delay.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
UCC2808AD-2ACTIVE-40 to 851.45 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UCC2808AD-2G4ACTIVE-40 to 851.45 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UCC2808ADTR-2ACTIVE-40 to 851.35 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UCC2808ADTR-2G4ACTIVE-40 to 851.35 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UCC2808AN-2ACTIVE-40 to 851.75 | 1kuPDIP (P) | 8 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UCC2808AN-2G4ACTIVE-40 to 851.75 | 1kuPDIP (P) | 8 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UCC2808APW-2ACTIVE-40 to 851.45 | 1kuTSSOP (PW) | 8 View 150 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UCC2808APW-2G4ACTIVE-40 to 851.45 | 1kuTSSOP (PW) | 8 View 150 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UCC2808APWTR-2ACTIVE-40 to 851.35 | 1kuTSSOP (PW) | 8 View 2000 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UCC2808APWTR-2G4ACTIVE-40 to 851.35 | 1kuTSSOP (PW) | 8 View 2000 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase 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

Reported Distributor Inventory as of 9:47 AM GMT, 08 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 20 WeeksUCC2808AD-2
AmericasRochester Electronics 25
AsiaWPI 198
EuropeAvnet-SILICA 225
WorldwideDigiKey 168
TI Lead Time*: 20 WeeksUCC2808AD-2G4
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUCC2808ADTR-2
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUCC2808ADTR-2G4
WorldwideDigiKey  Available
TI Lead Time*: 1 WeekUCC2808AN-2
AmericasRochester Electronics >1k
WorldwideDigiKey 149
Mouser Electronics 173
TI Lead Time*: 1 WeekUCC2808AN-2G4
EuropeEBV Elektronik 50
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUCC2808APW-2
AsiaWPI 133
EuropeAvnet-SILICA 150
TI Lead Time*: 20 WeeksUCC2808APW-2G4
None Reported
View Distributors
TI Lead Time*: 20 WeeksUCC2808APWTR-2
None Reported
View Distributors
TI Lead Time*: 20 WeeksUCC2808APWTR-2G4
None Reported
View Distributors
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
UCC2808AD-2 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UCC2808AD-2G4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UCC2808ADTR-2 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UCC2808ADTR-2G4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UCC2808AN-2 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView
UCC2808AN-2G4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView
UCC2808APW-2 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UCC2808APW-2G4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UCC2808APWTR-2 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UCC2808APWTR-2G4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU 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

Most useful technical documents for UCC2808A-2 Help

Datasheet

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...
Part # Name Product Family Comments
UCC2808A-1 Low-Power Current-Mode Push-Pull PWM AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UCC3808A-2 Low-Power Current-Mode Push-Pull PWM AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
LM237 3 Pin 1.5A Adjustable Negative Voltage Regulator LINEAR REGULATORS-STANDARD VOLTAGE REGULATORS TI customers also evaluated this product.

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