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LT3971A Datasheet

LT3971A Datasheet

38V, 1.3A, 2MHz Step-Down Regulator with 2.2μA Quiescent Current
Part No.: LT3971A
Page: 24 Pages
Size: 354 KB
Manufacturer: Linear Technology
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Views: 1
Update Time: 2023-11-07 15:27:15
DataSheet: Download

LT3971A Datasheet Applicable Part

Part No. Packing SPQ Marking MSL Pins Temp Range Package Description Buy
LT3971AIMSE#PBF Tube 50 LTGFQ 1 10 -40°C ~ 125°C 10-Lead Plastic MSOP  
LT3971AIMSE#TRPBF Reel 2500 LTGFQ 1 10 -40°C ~ 125°C 10-Lead Plastic MSOP  
LT3971AIMSE#TRMPBF Reel 500 LTGFQ 1 10 -40°C ~ 125°C 10-Lead Plastic MSOP  
SPQ:Standard Pack Quantity;MSL:Moisture Sensitivity Level

LT3971A Datasheet(PDF)

LT3971A Datasheet(Picture)

LT3971A Features

  • Ultralow Quiescent Current: 2.8μA IQ Regulating 12VIN to 3.3VOUT
  • Fixed Output Voltages: 5V 2.2μA IQ Regulating 12VIN to 5VOUT
  • Low Ripple Burst Mode® Operation: Output Ripple < 15mVP-P
  • Wide Input Voltage Range: 4.3V to 38V
  • 1.3A Maximum Output Current
  • Adjustable Switching Frequency: 200kHz to 2MHz
  • Synchronizable Between 250kHz to 2MHz
  • Fast Transient Response
  • Accurate 1V Enable Pin Threshold
  • Low Shutdown Current: IQ = 700nA
  • Power Good Flag
  • Soft-Start Capability
  • Internal Compensation
  • Output Voltage: 1.19V to 30V
  • Small Thermally Enhanced 10-Lead MSOP Package

LT3971A Applications

  • USB VBUS Regulation
  • Automotive Battery Regulation
  • Power for Portable Products
  • Industrial Supplies

LT3971A Description

The LT3971A is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 38V. Low quiescent current design consumes only 2.8μA of supply current while regulating with no load. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output ripple below 15mV in a typical application. An internally compensated current mode topology is used for fast transient response and good loop stability. A high efficiency 0.33Ω switch is included on the die along with a boost Schottky diode and the necessary oscillator, control and logic circuitry. An accurate 1V threshold enable pin can be used to shut down the LT3971A, reducing the input supply current to 700nA. A capacitor on the SS pin provides a controlled inrush current (soft-start). A power good flag signals when VOUT reaches 91% of the programmed output voltage. The LT3971A is available in a small 10-lead MSOP package with an exposed pad for low thermal resistance.

The LT3971A have a more accurate reference voltage compared to the LT3971. These characteristics are important for USB applications.

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