LT3990
Info: : PRODUCTION
searchIcon
cartIcon

LT3990

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

Show More showmore-icon

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 28
1ku List Price Starting From $3.07
Features
  • 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
Additional Details
show more Icon

The LT3990 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 62V, and consumes only 2.5μA of quiescent current. A high efficiency switch is included on the die along with the catch diode, boost diode, and the necessary oscillator, control and logic circuitry. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output ripple below 5mV in a typical application. Current mode topology is used for fast transient response and good loop stability. A catch diode current limit provides protection against shorted outputs and overvoltage conditions. An accurate programmable undervoltage lockout feature is available, producing a low shutdown current of 0.7μA. A power good flag signals when VOUT reaches 90% of the programmed output voltage. The LT3990 is available in small, thermally enhanced 16-pin MSOP and 3mm × 3mm DFN packages.

APPLICATIONS

  • Automotive Battery Regulation
  • Power for Portable Products
  • Industrial Supplies
Part Models 28
1ku List Price Starting From $3.07

close icon
Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT3990EDD#PBF
  • HTML
  • HTML
LT3990EDD#TRPBF
  • HTML
  • HTML
LT3990EMSE#PBF
  • HTML
  • HTML
LT3990EMSE#TRPBF
  • HTML
  • HTML
LT3990EMSE-3.3#PBF
  • HTML
  • HTML
LT3990EMSE-3.3#TRPBF
  • HTML
  • HTML
LT3990EMSE-5#PBF
  • HTML
  • HTML
LT3990EMSE-5#TRPBF
  • HTML
  • HTML
LT3990EMSE-5#WPBF
  • HTML
  • HTML
LT3990EMSE-5#WTRPBF
  • HTML
  • HTML
LT3990HMSE#PBF
  • HTML
  • HTML
LT3990HMSE#TRPBF
  • HTML
  • HTML
LT3990HMSE-3.3#PBF
  • HTML
  • HTML
LT3990HMSE-3.3#TRPBF
  • HTML
  • HTML
LT3990HMSE-5#PBF
  • HTML
  • HTML
LT3990HMSE-5#TRPBF
  • HTML
  • HTML
LT3990HMSE-5#WPBF
  • HTML
  • HTML
LT3990HMSE-5#WTRPBF
  • HTML
  • HTML
LT3990IDD#PBF
  • HTML
  • HTML
LT3990IDD#TRPBF
  • HTML
  • HTML
LT3990IMSE#PBF
  • HTML
  • HTML
LT3990IMSE#TRPBF
  • HTML
  • HTML
LT3990IMSE-3.3#PBF
  • HTML
  • HTML
LT3990IMSE-3.3#TRPBF
  • HTML
  • HTML
LT3990IMSE-5#PBF
  • HTML
  • HTML
LT3990IMSE-5#TRPBF
  • HTML
  • HTML
LT3990IMSE-5#WPBF
  • HTML
  • HTML
LT3990IMSE-5#WTRPBF
  • HTML
  • HTML

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Feb 4, 2020

- 20_0132

Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

LT3990EMSE#PBF

PRODUCTION

LT3990EMSE#TRPBF

PRODUCTION

LT3990EMSE-3.3#PBF

PRODUCTION

LT3990EMSE-3.3#TRPBF

PRODUCTION

LT3990EMSE-5#PBF

PRODUCTION

LT3990EMSE-5#TRPBF

PRODUCTION

LT3990EMSE-5#WPBF

PRODUCTION

LT3990EMSE-5#WTRPBF

PRODUCTION

LT3990HMSE#PBF

PRODUCTION

LT3990HMSE#TRPBF

PRODUCTION

LT3990HMSE-3.3#PBF

PRODUCTION

LT3990HMSE-3.3#TRPBF

PRODUCTION

LT3990HMSE-5#PBF

PRODUCTION

LT3990HMSE-5#TRPBF

PRODUCTION

LT3990HMSE-5#WPBF

PRODUCTION

LT3990HMSE-5#WTRPBF

PRODUCTION

LT3990IMSE#PBF

PRODUCTION

LT3990IMSE#TRPBF

PRODUCTION

LT3990IMSE-3.3#PBF

PRODUCTION

LT3990IMSE-3.3#TRPBF

PRODUCTION

LT3990IMSE-5#PBF

PRODUCTION

LT3990IMSE-5#TRPBF

PRODUCTION

LT3990IMSE-5#WPBF

PRODUCTION

Oct 11, 2022

- 22_0244

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LT3990HMSE#PBF

PRODUCTION

LT3990HMSE#TRPBF

PRODUCTION

LT3990IMSE#PBF

PRODUCTION

LT3990IMSE#TRPBF

PRODUCTION

LT3990IMSE-5#PBF

PRODUCTION

LT3990IMSE-5#TRPBF

PRODUCTION

Apr 18, 2022

- 22_0050

UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices

LT3990HMSE#PBF

PRODUCTION

LT3990HMSE#TRPBF

PRODUCTION

LT3990IMSE#PBF

PRODUCTION

LT3990IMSE#TRPBF

PRODUCTION

Jun 21, 2022

- 22_0050

UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Feb 4, 2020

- 20_0132

arrow down

Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

LT3990EMSE#PBF

PRODUCTION

LT3990EMSE#TRPBF

PRODUCTION

LT3990EMSE-3.3#PBF

PRODUCTION

LT3990EMSE-3.3#TRPBF

PRODUCTION

LT3990EMSE-5#PBF

PRODUCTION

LT3990EMSE-5#TRPBF

PRODUCTION

LT3990EMSE-5#WPBF

PRODUCTION

LT3990EMSE-5#WTRPBF

PRODUCTION

LT3990HMSE#PBF

PRODUCTION

LT3990HMSE#TRPBF

PRODUCTION

LT3990HMSE-3.3#PBF

PRODUCTION

LT3990HMSE-3.3#TRPBF

PRODUCTION

LT3990HMSE-5#PBF

PRODUCTION

LT3990HMSE-5#TRPBF

PRODUCTION

LT3990HMSE-5#WPBF

PRODUCTION

LT3990HMSE-5#WTRPBF

PRODUCTION

LT3990IMSE#PBF

PRODUCTION

LT3990IMSE#TRPBF

PRODUCTION

LT3990IMSE-3.3#PBF

PRODUCTION

LT3990IMSE-3.3#TRPBF

PRODUCTION

LT3990IMSE-5#PBF

PRODUCTION

LT3990IMSE-5#TRPBF

PRODUCTION

LT3990IMSE-5#WPBF

PRODUCTION

Oct 11, 2022

- 22_0244

arrow down

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LT3990HMSE#PBF

PRODUCTION

LT3990HMSE#TRPBF

PRODUCTION

LT3990IMSE#PBF

PRODUCTION

LT3990IMSE#TRPBF

PRODUCTION

LT3990IMSE-5#PBF

PRODUCTION

LT3990IMSE-5#TRPBF

PRODUCTION

Apr 18, 2022

- 22_0050

arrow down

UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices

LT3990HMSE#PBF

PRODUCTION

LT3990HMSE#TRPBF

PRODUCTION

LT3990IMSE#PBF

PRODUCTION

LT3990IMSE#TRPBF

PRODUCTION

Jun 21, 2022

- 22_0050

arrow down

UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

reference details image

DC1471A

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

zoom

DC1471A

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

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

Product Detail

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.

Tools & Simulations

Tools & Simulations 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

Recently Viewed