LT3668
RECOMMENDED FOR NEW DESIGNS40V 400mA Step-Down Switching Regulator with Dual Fault Protected Tracking LDOs
- Part Models
- 6
- 1ku List Price
- Starting From $3.89
Overview
- Dual Low Dropout Linear Tracking Regulators
- 200mA Outputs with Programmable Current Limits
- 1.6V to 45V Input Range
- Fault Protected to ±45V
- Triple Output Supply from a Single Input Requires Only One Inductor
- IQ = 50μA at 12VIN to 6V and 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)
- Adjustable 250kHz to 2.2MHz Switching Frequency
- Power Good Indicator
- Available in a Thermally-Enhanced 16-Lead MSOP Package
The LT3668 is a monolithic triple power supply composed of a 400mA buck switching regulator and two 200mA low dropout linear tracking regulators (LDOs).This provides a complete and robust power solution for applications that require the power supply of a sensor to tightly track the power supply of a measurement ASIC.
Each tracking 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 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.
The LT3668 is available in a thermally-enhanced 16-lead MSOP package with exposed pad for low thermal resistance.
Applications
- Fault-Protected Sensor Supply
- Automotive and Industrial Supplies
- Power for Portable Instrumentation
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 |
|---|---|---|---|
| LT3668EMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3668EMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LT3668HMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3668HMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LT3668IMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3668IMSE#TRPBF | 16-Lead MSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2) |
||
| LT3668EMSE#PBF | PRODUCTION | |
| LT3668EMSE#TRPBF | PRODUCTION | |
| LT3668HMSE#PBF | PRODUCTION | |
| LT3668HMSE#TRPBF | PRODUCTION | |
| LT3668IMSE#PBF | PRODUCTION | |
| LT3668IMSE#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LT3668EMSE#PBF | PRODUCTION | |
| LT3668EMSE#TRPBF | PRODUCTION | |
| LT3668HMSE#PBF | PRODUCTION | |
| LT3668HMSE#TRPBF | PRODUCTION | |
| LT3668IMSE#PBF | PRODUCTION | |
| LT3668IMSE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LT3668
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
LT3668EMSE Demo Board | 40V Buck Plus Dual Post-Regulator LDOs
Resources
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