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LINEAR TECHNOLOGY LT8640IUDC#TRPBF DC-DC Switching Step Down Regulator, Adjustable, 3.4V-42Vin, 970mV-41.9Vout, 5Aout, QFN-18

Manufacturer : Analog Devices, Inc
Package/Case : QFN-18
Product Categories : DC-DC Converters
Datasheet: LT8640IUDC#TRPBF Datasheet (PDF)
RoHs Status: Lead free / RoHS Compliant
In-stock: 2530


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LT8640IUDC#TRPBF Product Details

The LT8640/LT8640-1 step-down regulator features Silent Switcher architecture designed to minimize EMI/EMC emissions while delivering high efficiency at frequencies up to 3MHz. An ultralow 2.5µA quiescent current—with the output in full regulation—enables applications requiring highest efficiency at very small load currents.

The LT8640/LT8640-1 allows high VIN to low VOUT conversion at high frequency with a fast minimum top switch on-time of 30ns. The SYNC/MODE pin selects between Burst Mode operation, spread spectrum mode, synchronization to an external clock, and either pulse-skipping (LT8640) or forced continuous mode (LT8640-1).

PackageSYNC/MODE ≠ 0VC COMPH-GRADECLKOUTINTERNAL CAPSLT8640QFNPulse-SkippingInternalYesNoNoLT8640-1QFNFCMInternalYesNoNoLT8640SLQFNFCMInternalNoYesYesLT8643SLQFNFCMExternalNoYesYesLT8640S-2LQFNFCMInternalYesYesNoLT8643S-2LQFNFCMExternalYesYesNo



  • Silent Switcher® Architecture
    • Ultralow EMI/EMC Emissions
    • Spread Spectrum Frequency Modulation
  • High Efficiency at High Frequency
    • Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT
    • Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT
  • Wide Input Voltage Range: 3.4V to 42V
  • 5A Maximum Continuous Output, 7A Peak Transient Output
  • Ultralow Quiescent Current Burst Mode® Operation
    • 2.5µA IQ Regulating 12VIN to 3.3VOUT
    • Output Ripple < 10mVP-P
  • Fast Minimum Switch On-Time: 30ns
  • Low Dropout Under All Conditions: 100mV at 1A
  • Forced Continuous Mode (LT8640-1 Only)
  • Safely Tolerates Inductor Saturation in Overload
  • Adjustable and Synchronizable: 200kHz to 3MHz
  • Peak Current Mode Operation
  • Output Soft-Start and Tracking
  • Small 18-Lead 3mm × 4mm QFN and Side Wettable QFN


  • Automotive and Industrial Supplies
  • General Purpose Step-Down
  • GSM Power Supplies

Technical Parameters

  • Function
  • Step-Down
  • Output Configuration
  • Positive
  • Topology
  • Buck
  • Output Type
  • Adjustable
  • Number of Outputs
  • 1
  • Voltage Input (Min)
  • 3.4V
  • Voltage Input (Max)
  • 42V
  • Voltage Output (Min/Fixed)
  • 0.97V
  • Voltage Output (Max)
  • 42V
  • Current Output
  • 5A
  • Frequency Switching
  • 210kHz ~ 2MHz
  • Synchronous Rectifier
  • Yes
  • Operating Temperature
  • -40??C ~ 125??C (TJ)
  • Mounting Type
  • Surface Mount
  • Package / Case
  • 20-WFQFN, 18 Leads, Exposed Pad
  • Supplier Device Package
  • 20-QFN (3x4)

LT8640IUDC#TRPBF Datasheet

  • LT8640 Technical Documentation/Data sheet

LT8640IUDC#TRPBF Related Products

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  • **ngo ***

    Schnelle Lieferung, alles bestens, gerne wieder - Vielen Dank.

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Analog Devices, Inc

Analog Devices, Inc. was founded by two MIT graduates, Ray Stata and Matthew Lorber in 1965. The same year, the company released its first product, the model 101 op amp, which was a hockey-puck sized module used in test and measurement equipment. In 1967, the company published the first issue of its...
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