LT3667 - 40V 400mA Step-Down Switching Regulator with Dual Fault Protected LDOs
- 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
The LT®3667 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.
PackagingFor complete and up to date package information and drawings, please refer to our packaging page
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
|Buy Now • Request Samples|
Demo BoardsLinear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
|DC1869A||LT3667 Demo Board | Buck Plus Dual Fault-Protected LDOs, 6V ≤ VIN ≤40V, Vout1 = 5V, Vout2/Vout3 = 3.3V/2.5V @ 200mA||$125.00|
- Automotive Battery Regulation
- Power for Portable Instrumentation
- Industrial Supplies
- Fault-Protected Sensor Supply
People Who Viewed This Product Also Viewed
- LT8471 - Dual Multitopology DC/DC Converters with 2A Switches and Synchronization
- LT8705 - 80V VIN and VOUT Synchronous 4-Switch Buck- Boost DC/DC Controller
- LT8614 - 42V, 4A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current
- LT1763 - 500mA, Low Noise, LDO Micropower Regulators
- LTC3630 - High Efficiency, 65V 500mA Synchronous Step-Down Converter
- LT4320/LT4320-1 - Ideal Diode Bridge Controller
- LTC3115-1 - 40V, 2A Synchronous Buck-Boost DC/DC Converter
- LTC3639 - High Efficiency, 150V 100mA Synchronous Step-Down Regulator
- LTC4364 - Surge Stopper with Ideal Diode
- LT3080 - Adjustable 1.1A Single Resistor Low Dropout Regulator
Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.
LTspice® IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice IV
To launch a ready to run LTspice demonstration circuit for this part:
- Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- Step 3: If LTspice IV does not automatically open after clicking the link above, 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
To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Models for the following parts are available in LTspice IV: