1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. External Power Switch Buck Controllers
  6. LTC3802


Features and Benefits

  • Wide VIN Range: 3V to 30V Operation with Line Feedforward Compensation
  • Leading Edge Modulation Architecture for Extremely Low Duty Cycle Operation
  • Phase-Lockable Fixed Frequency: 330kHz to 750kHz
  • Two 180° Out-of-Phase Controllers
  • Fast Programmable Power-Up/-Down Tracking
  • Programmable Current Limit Without External Current Sense Resistor
  • Optional Burst Mode® Operation at Light Load
  • ±1% 0.6V Voltage Reference
  • External N-Channel MOSFET Architecture
  • Low Shutdown Current: <100µA
  • Overvoltage Protection and PGOOD Flag
  • Small 28-Lead SSOP and 32-Lead QFN Packages

Product Details

The LTC3802 is a dual switching regulator controller optimized for high efficiency step-down conversion from input voltages between 3V to 30V. The controller uses a leading edge modulation scheme to allow extremely low duty cycle operation. The constant frequency voltage mode controller allows a phase-lockable frequency between 330kHz and 750kHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages 180° out of phase. The synchronous buck architecture automatically shifts to Burst Mode operation as the output load decreases, ensuring maximum efficiency over a wide range of load currents.

The LTC3802 features an onboard, trimmed 0.6V reference and provides better than 1% regulation at the converter outputs. A separate output sense provides real time overvoltage protection and PGOOD sensing. An FBT pin programs the power-up/-down tracking between the two channels to meet various sequencing requirements. A RUN/SS pin provides soft-start and externally programmable current limit protection functions.

U.S. Patent Nos 5481178, 5846544, 6304066, 6580258, 5055767, 6307356


  • Notebook and Palmtop Computers
  • Portable Instruments
  • Battery-Operated Digital Devices
  • DC Power Distribution Systems

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations


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Product Recommendations

LTC3802 Companion Parts

Recommended Related Parts

Recommended Suggested Oscillator

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC3802EGN#PBF Material Declaration Reliability Data 28-Lead SSOP (Narrow 0.15 Inch)
LTC3802EGN#TRPBF Material Declaration Reliability Data 28-Lead SSOP (Narrow 0.15 Inch)
LTC3802EUH#PBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
LTC3802EUH#TRPBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
Wafer Fabrication Data R384 Reliability Data

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Evaluation Boards

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.