LT3667
Info : RECOMMENDED FOR NEW DESIGNS
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LT3667

40V 400mA Step-Down Switching Regulator with Dual Fault Protected LDOs

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 12
1ku List Price Starting From $3.07
Features
  • Triple Output Supply from a Single Input Requires Only One Inductor
  • IQ = 50μA at 12VIN to 5V, 3.3V and 2.5V with No Load
  • Buck Regulator:
    • Low Ripple (<15mVP-P) Burst Mode Operation®
    • 400mA Output with Internal Power Switch
    • 4.3V to 40V Input Operation Range (60V Max)
  • Dual Low Dropout Linear Regulators
    • 200mA Outputs with Programmable Current Limits
    • 1.6V to 45V Input Range
    • Fault Protected to ±45V
  • Adjustable 250kHz to 2.2MHz Switching Frequency
  • Synchronizable Between 300kHz and 2.2MHz
  • Programmable Undervoltage Lockout
  • Power Good Indicators
  • Available in a Thermally-Enhanced 16-Lead MSOP and 24-Lead (3mm × 5mm) QFN Packages
Additional Details
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The LT3667 is a monolithic triple power supply composed of a 400mA buck switching regulator and two 200mA low dropout linear regulators (LDOs).

The buck regulator includes a high efficiency switch, a boost 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.

Each LDO supplies 200mA of output current with a typical dropout voltage of 340mV, and each LDO has an accurate resistor programmable current limit.

Internal protection circuitry includes reverse-battery protection, current limiting, thermal limiting and reverse current protection.

The LT3667 is available in a thermally-enhanced 16-Lead MSOP and a 24-Pin 3mm x 5mm QFN package with exposed pad for low thermal resistance.

Applications

  • Automotive Battery Regulation
  • Power for Portable Instrumentation
  • Industrial Supplies
  • Fault-Protected Sensor Supply
Part Models 12
1ku List Price Starting From $3.07

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Feb 4, 2020

- 20_0132

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

LT3667EMSE#PBF

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LT3667EMSE#TRPBF

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Filter by Model

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Part Models

Product Lifecycle

PCN

Feb 4, 2020

- 20_0132

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

LT3667EMSE#PBF

PRODUCTION

LT3667EMSE#TRPBF

PRODUCTION

LT3667HMSE#PBF

PRODUCTION

LT3667HMSE#TRPBF

PRODUCTION

LT3667IMSE#PBF

PRODUCTION

LT3667IMSE#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC1869A

LT3667 Demo Board | Buck Plus Dual Fault-Protected LDOs, 6V ≤ VIN ≤40V, VOUT1 = 5V, VOUT2/VOUT3 = 3.3V/2.5V @ 200mA

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DC1869A

LT3667 Demo Board | Buck Plus Dual Fault-Protected LDOs, 6V ≤ VIN ≤40V, VOUT1 = 5V, VOUT2/VOUT3 = 3.3V/2.5V @ 200mA

LT3667 Demo Board | Buck Plus Dual Fault-Protected LDOs, 6V ≤ VIN ≤40V, VOUT1 = 5V, VOUT2/VOUT3 = 3.3V/2.5V @ 200mA

Product Detail

Demonstration circuit 1869A is a triple power supply including one 400mA step-down regulator and two 200mA low dropout linear regulators (LDOs) featuring the LT3667. The demo circuit is designed for 5.0V, 3.3V and 2.5V outputs from a 6V to 40V input. Two LDO outputs are configured as post-regulators of the switching regulator output. The total current capability of three output channels is up to 400mA in this configuration, while the two LDO regulators are capable of 200mA each.


 


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.

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