LT3480 - 36V, 2A, 2.4MHz Step-Down Switching Regulator with 70µA Quiescent Current

The LT3480 is an adjustable frequency (200kHz to 2.4MHz) monolithic buck switching regulator that accepts input voltages up to 36V (60V maximum). A high efficiency 0.25Ω switch is included on the die along with a boost Schottky diode and the necessary oscillator, control, and logic circuitry. Current mode topology is used for fast transient response and good loop stability. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 15mV in a typical application. In addition, the LT3480 can further enhance low output current efficiency by drawing bias current from the output when VOUT is above 3V. Shutdown reduces input supply current to less than 1µA while a resistor and capacitor on the RUN/SS pin provide a controlled output voltage ramp (soft-start). A power good flag signals when VOUT reaches 86% of the programmed output voltage. The LT3480 is available in 10-Pin MSOP and 3mm x 3mm DFN packages with exposed pads for low thermal resistance.

Features
  • Wide Input Range:  Operation from 3.6V to 36V  Over-Voltage Lockout Protects Circuits through  60V Transient
  • 2A Maximum Output Current
  • Low Ripple Burst Mode Operation   70µA IQ at 12VIN to 3.3VOUT   Output Ripple < 15mV
  • Adjustable Switching Frequency: 200kHz to 2.4MHz
  • Low Shutdown Current: IQ < 1µA
  • Integrated Boost Diode
  • Synchronizable Between 250kHz to 2MHz
  • Power Good Flag
  • Saturating Switch Design: 0.25Ω On-Resistance
  • 0.790V Feedback Reference Voltage
  • Output Voltage: 0.79V to 20V
  • Soft-Start Capability
  • Small 10-Pin Thermally Enhanced MSOP and (3mm x 3mm) DFN Packages
Typical Application
LT3480 Typical Application
LT3480 Typical Application
Applications
  • Automotive Battery Regulation
  • Power for Portable Products
  • Distributed Supply Regulation
  • Industrial Supplies
Packaging
LT3480 Package Drawing
LT3480 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT3480EDD#PBF3x3 DFN-10E$4.93$3.45
LT3480EDD#TRPBF3x3 DFN-10E$3.51
LT3480EMSE#PBFMS-10EE$5.07$3.55
LT3480EMSE#TRPBFMS-10EE$3.61
LT3480HMSE#PBFMS-10EH$6.44$4.51
LT3480HMSE#TRPBFMS-10EH$4.57
LT3480IDD#PBF3x3 DFN-10I$5.91$4.14
LT3480IDD#TRPBF3x3 DFN-10I$4.20
LT3480IMSE#PBFMS-10EI$6.09$4.26
LT3480IMSE#TRPBFMS-10EI$4.32
LT3480MPMSEMS-10EMP$16.43$11.50
LT3480MPMSE#PBFMS-10EMP$16.43$11.50
LT3480MPMSE#TRPBFMS-10EMP$11.56
Demo Boards
Part NumberDescriptionPrice
DC1091ALT3480EMSE Demo Board | (MSOP) 6.3V ≤ VIN ≤ 38V (60V Transients), VOUT = 5V @ 2A$125.00
DC1212A-ALT3480EDD Demo Board | (DFN) EN55022 Compliant, Micropower, 6.3V ≤ VIN ≤ 38V (60V Transients), Vout = 5V @ 2A$100.00
DC1394ALT3480 HV Buck regulator board with plug in interfaceContact Factory
Datasheet
Reliability Data
LT Journal
Press Release
CAD Symbol
LTspice
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LT3480 Footprints and Symbols
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