LT3990

PRODUCTION

62V, 350mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes

Data Sheet (Rev. B) Product Selection Table
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Overview

  • Low Ripple Burst Mode® Operation
    • 2.5μA IQ at 12VIN to 3.3VOUT
    • Output Ripple < 5mVP-P
  • Wide Input Voltage Range: 4.2V to 62V Operating
  • Adjustable Switching Frequency: 200kHz to 2.2MHz
  • Integrated Boost and Catch Diodes
  • 350mA Output Current
  • Fixed Output Voltages: 3.3V, 5V
    • 2μA IQ at 12VIN
  • Accurate Programmable Undervoltage Lockout
  • FMEA Fault Tolerant (MSOP Package)
    • Output Stays at or Below Regulation Voltage During
    • Adjacent Pin Short or When a Pin is Left Floating
  • Low Shutdown Current: IQ = 0.7μA
  • Internal Sense Limits Catch Diode Current
  • Power Good Flag
  • Small, Thermally Enhanced 16-Pin MSOP and (3mm × 3mm) DFN Packages
  • AEC-Q100 Qualified for Automotive Applications
LT3990
62V, 350mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes
5V Step-Down Converter Power Loss Product Package 1 Product Package 2
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Documentation

Data Sheet 1

User Guide 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Circuit Monitors 1
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3990
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LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

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schematic 1
schematic 2
schematic 3
DC1471A

LT3990EMSE Demo Board | 6.5V ≤ VIN ≤ 60V, VOUT = 5V @ 350mA, Integrated Diodes

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Product Details

Demonstration circuit 1471 is a monolithic step-down DC/DC switching regulator featuring the LT3990. The switching frequency is adjustable up to 2.2MHz. The demo circuit is designed for 5V, 350mA output from a 6.5V to 62V input. The wide input range of the LT3990 allows a variety of input sources including automotive batteries and 24V industrial supplies. Low ripple Burst Mode increases the efficiency at the light load while keeping the output ripple below 5mV in a typical application. The part is in shutdown when the EN pin is low and active when the pin is high. The threshold of the EN pin is accurate at 1V when VIN is above 4.2V. Adding a resistor divider from VIN to EN can program the LT3990 to regulate the output only when VIN is above a desired voltage. The catch diode and boost diode are integrated to reduce the components count and solution size. The circuit consumes only 2.5μA of quiescent current.
DC1471A
LT3990EMSE Demo Board | 6.5V ≤ VIN ≤ 60V, VOUT = 5V @ 350mA, Integrated Diodes
DC1471A Demo Boards DC1471A Demo Boards DC1471A - Schematic

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LT3990 Outputs only 2V in Burst Mode with almost no load
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