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TL2845B Status: ACTIVE

High-Performance Current-Mode PWM Controller


      
         
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 TL2842B TL2843B TL2844B TL2845B
TopologyBoost, Flyback, Forward  Boost, Flyback, Forward  Boost, Flyback, Forward  Boost, Flyback, Forward  
Control MethodCurrent Mode  Current Mode  Current Mode  Current Mode  
Duty Cycle(Max)(%)100  100  50  50  
PWM Outputs(#)1  1  1  1  
Frequency(Max)(kHz)500  500  500  500  
UVLO Thresholds On/Off(V)16/10  8.4/7.6  16/10  8.4/7.6  
Pin/Package14SOIC, 8PDIP, 8SOIC  14SOIC, 8SOIC, 8PDIP  14SOIC, 8PDIP, 8SOIC  14SOIC, 8PDIP, 8SOIC  
Regulated Outputs(#)1  1  1  1  
 SamplesSamplesSamplesSamples
 InventoryInventoryInventoryInventory

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  • BQ27210: Li-Ion and Li-Pol Battery Gas Gauge IC for Portable Applications (bqJUNIOR)
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Product Information

Features

  • Low Start-Up Current (<0.5 mA)
  • Trimmed Oscillator Discharge Current
  • Current Mode Operation to 500 kHz
  • Automatic Feed-Forward Compensation
  • Latching PWM for Cycle-by-Cycle Current Limiting
  • Internally Trimmed Reference With Undervoltage Lockout
  • High-Current Totem-Pole Output Undervoltage Lockout With Hysteresis
  • Double-Pulse Suppression

DESCRIPTION/ORDERING INFORMATION

The TL284xB and TL384xB series of control integrated circuits provide the features that are necessary to implement off-line or dc-to-dc fixed-frequency current-mode control schemes, with a minimum number of external components. Internally implemented circuits include an undervoltage lockout (UVLO) and a precision reference that is trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.

The TL284xB and TL384xB series are pin compatible with the standard TL284x and TL384x with the following improvements. The start-up current is specified to be 0.5 mA (max), while the oscillator discharge current is trimmed to 8.3 mA (typ). In addition, during undervoltage lockout conditions, the output has a maximum saturation voltage of 1.2 V while sinking 10 mA (VCC = 5 V).

Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges. Typical UVLO thresholds of 16 V (on) and 10 V (off) on the TLx842B and TLx844B devices make them ideally suited to off-line applications. The corresponding typical thresholds for the TLx843B and TLx845B devices are 8.4 V (on) and 7.6 V (off). The TLx842B and TLx843B devices can operate to duty cycles approaching 100%. A duty-cycle range of 0% to 50% is obtained by the TLx844B and TLx845B by the addition of an internal toggle flip-flop, which blanks the output off every other clock cycle.The TL284xB-series devices are characterized for operation from -40°C to 85°C. The TL384xB-series devices are characterized for operation from 0°C to 70°C.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
TL2845BDACTIVE-40 to 850.65 | 1kuSOIC (D) | 14 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
TL2845BD-8ACTIVE-40 to 850.65 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
TL2845BDG4ACTIVE-40 to 850.65 | 1kuSOIC (D) | 14 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
TL2845BDG4-8ACTIVE-40 to 850.65 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
TL2845BDRACTIVE-40 to 850.60 | 1kuSOIC (D) | 14 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this Footprint
TL2845BDR-8ACTIVE-40 to 850.60 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this Footprint
TL2845BDRG4ACTIVE-40 to 850.60 | 1kuSOIC (D) | 14 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this Footprint
TL2845BDRG4-8ACTIVE-40 to 850.60 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this Footprint
TL2845BPACTIVE-40 to 850.60 | 1kuPDIP (P) | 8 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
TL2845BPE4ACTIVE-40 to 850.60 | 1kuPDIP (P) | 8 View 50 | TUBE 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 10:30 AM GMT, 06 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 14 WeeksTL2845BD
AmericasArrow >1k
Rochester Electronics 670
AsiaWPI 40
WorldwideDigiKey  Available
TI Lead Time*: 11 WeeksTL2845BD-8
AmericasArrow >1k
Rochester Electronics 813
EuropeAvnet-SILICA 375
WorldwideDigiKey  Available
TI Lead Time*: 14 WeeksTL2845BDG4
WorldwideDigiKey  Available
TI Lead Time*: 11 WeeksTL2845BDG4-8
WorldwideDigiKey  Available
TI Lead Time*: 18 WeeksTL2845BDR
AmericasArrow >1k
Rochester Electronics >1k
WorldwideDigiKey >1k
Mouser Electronics >1k
TI Lead Time*: 15 WeeksTL2845BDR-8
AmericasArrow >1k
WorldwideDigiKey >1k
Mouser Electronics >1k
TI Lead Time*: 18 WeeksTL2845BDRG4
WorldwideDigiKey  Available
TI Lead Time*: 15 WeeksTL2845BDRG4-8
WorldwideDigiKey  Available
TI Lead Time*: 14 WeeksTL2845BP
AmericasRochester Electronics >1k
AsiaWPI 88
EuropeAvnet-SILICA 800
WorldwideMouser Electronics 670
TI Lead Time*: 14 WeeksTL2845BPE4
None Reported
View Distributors
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** 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
TL2845BD RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
TL2845BD-8 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
TL2845BDG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
TL2845BDG4-8 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
TL2845BDR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
TL2845BDR-8 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
TL2845BDRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
TL2845BDRG4-8 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
TL2845BP RoHS Compliant Pb-Free (RoHS) CU NIPDAU N/A for Pkg TypeViewView
TL2845BPE4 RoHS Compliant Pb-Free (RoHS) 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 TL2845B Help

Datasheet

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