LT3667
RECOMMENDED FOR NEW DESIGNS40V 400mA Step-Down Switching Regulator with Dual Fault Protected LDOs
- Part Models
- 12
- 1ku List Price
- Starting From $3.89
Overview
- 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 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
Documentation
Data Sheet 1
User Guide 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT3667EMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3667EMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LT3667EUDD#PBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) | ||
| LT3667EUDD#TRPBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) | ||
| LT3667HMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3667HMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LT3667HUDD#PBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) | ||
| LT3667HUDD#TRPBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) | ||
| LT3667IMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3667IMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LT3667IUDD#PBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) | ||
| LT3667IUDD#TRPBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only) |
||
| LT3667EMSE#PBF | PRODUCTION | |
| LT3667EMSE#TRPBF | PRODUCTION | |
| LT3667EUDD#PBF | PRODUCTION | |
| LT3667EUDD#TRPBF | PRODUCTION | |
| LT3667HMSE#PBF | PRODUCTION | |
| LT3667HMSE#TRPBF | PRODUCTION | |
| LT3667IMSE#PBF | PRODUCTION | |
| LT3667IMSE#TRPBF | PRODUCTION | |
| LT3667IUDD#PBF | PRODUCTION | |
| LT3667IUDD#TRPBF | PRODUCTION | |
|
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2) |
||
| LT3667EMSE#PBF | PRODUCTION | |
| LT3667EMSE#TRPBF | PRODUCTION | |
| LT3667HMSE#PBF | PRODUCTION | |
| LT3667HMSE#TRPBF | PRODUCTION | |
| LT3667IMSE#PBF | PRODUCTION | |
| LT3667IMSE#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0132 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 | |
|
Apr 9, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only) |
||
| LT3667HUDD#PBF | PRODUCTION | |
| LT3667HUDD#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3667
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
LT3667 Demo Board | Buck Plus Dual Fault-Protected LDOs, 6V ≤ VIN ≤40V, VOUT1 = 5V, VOUT2/VOUT3 = 3.3V/2.5V @ 200mA
Resources
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