LT3695 Series - 1A Fault Tolerant Micropower Step-Down Regulator
Features
- Wide Input Range:
Operation from 3.6V to 36V
Overvoltage Lockout Protects Circuits
Through 60V Transients - FMEA Fault Tolerant:
Output Stays at or Below Regulation Voltage
During Adjacent Pin Short or When a Pin Is Left Floating - 1A Output Current
- Low Ripple (< 15mVP-P) Burst Mode® Operation
IQ = 75μA for 12VIN to 3.3VOUT with No Load - Adjustable Switching Frequency: 250kHz to 2.2MHz
- Short-Circuit Protected
- Synchronizable Between 300kHz and 2.2MHz
- Output Voltage: 0.8V to 20V
- Power Good Flag
- Fixed Output Voltage Versions for 3.3V and 5V Available Small, Thermally Enhanced 16-Pin MSOP Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LT3695 series are adjustable frequency (250kHz to 2.2MHz) monolithic buck switching regulators that accept input voltages up to 36V and can safely sustain transient voltages up to 60V. The devices include 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. A SYNC pin allows the user to synchronize the part to an external clock, and to choose between low ripple Burst Mode operation and standard PWM operation.
The LT3695 regulators tolerate adjacent pin shorts or an open pin without raising the output voltage above its programmed value.
Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 15mV in a typical application. Shutdown reduces input supply current to less than 1μA while a resistor and capacitor on the RUN/SS pin provide a controlled output voltage ramp (soft-start). Protection circuitry senses the current in the power switch and external Schottky catch diode to protect the LT3695 regulators against short-circuit conditions. Frequency foldback and thermal shutdown provide additional protection.
The LT3695 series is available in a thermally enhanced 16-pin MSOP package.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LT3695EMSE-3.3#PBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LT3695EMSE-3.3#TRPBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LT3695EMSE-5#PBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LT3695EMSE-5#TRPBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LT3695EMSE#PBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LT3695EMSE#TRPBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LT3695HMSE-3.3#PBF | MS-16E | MSE | H | 05-08-1667 | Yes |
| LT3695HMSE-3.3#TRPBF | MS-16E | MSE | H | 05-08-1667 | Yes |
| LT3695HMSE-5#PBF | MS-16E | MSE | H | 05-08-1667 | Yes |
| LT3695HMSE-5#TRPBF | MS-16E | MSE | H | 05-08-1667 | Yes |
| LT3695HMSE#PBF | MS-16E | MSE | H | 05-08-1667 | Yes |
| LT3695HMSE#TRPBF | MS-16E | MSE | H | 05-08-1667 | Yes |
| LT3695IMSE-3.3#PBF | MS-16E | MSE | I | 05-08-1667 | Yes |
| LT3695IMSE-3.3#TRPBF | MS-16E | MSE | I | 05-08-1667 | Yes |
| LT3695IMSE-5#PBF | MS-16E | MSE | I | 05-08-1667 | Yes |
| LT3695IMSE-5#TRPBF | MS-16E | MSE | I | 05-08-1667 | Yes |
| LT3695IMSE#PBF | MS-16E | MSE | I | 05-08-1667 | Yes |
| LT3695IMSE#TRPBF | MS-16E | MSE | I | 05-08-1667 | Yes |
Order Info
- 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
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT3695EMSE-3.3#PBF | MS-16E | E | $4.64 | $3.25 | Yes | |
| LT3695EMSE-3.3#TRPBF | MS-16E | E | $3.31 | Yes | ||
| LT3695EMSE-5#PBF | MS-16E | E | $4.64 | $3.25 | Yes | |
| LT3695EMSE-5#TRPBF | MS-16E | E | $3.31 | Yes | ||
| LT3695EMSE#PBF | MS-16E | E | $4.64 | $3.25 | Yes | |
| LT3695EMSE#TRPBF | MS-16E | E | $3.31 | Yes | ||
| LT3695HMSE-3.3#PBF | MS-16E | H | $5.51 | $3.86 | Yes | |
| LT3695HMSE-3.3#TRPBF | MS-16E | H | $3.92 | Yes | ||
| LT3695HMSE-5#PBF | MS-16E | H | $5.51 | $3.86 | Yes | |
| LT3695HMSE-5#TRPBF | MS-16E | H | $3.92 | Yes | ||
| LT3695HMSE#PBF | MS-16E | H | $5.51 | $3.86 | Yes | |
| LT3695HMSE#TRPBF | MS-16E | H | $3.92 | Yes | ||
| LT3695IMSE-3.3#PBF | MS-16E | I | $5.16 | $3.61 | Yes | |
| LT3695IMSE-3.3#TRPBF | MS-16E | I | $3.67 | Yes | ||
| LT3695IMSE-5#PBF | MS-16E | I | $5.16 | $3.61 | Yes | |
| LT3695IMSE-5#TRPBF | MS-16E | I | $3.67 | Yes | ||
| LT3695IMSE#PBF | MS-16E | I | $5.16 | $3.61 | Yes | |
| LT3695IMSE#TRPBF | MS-16E | I | $3.67 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear 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.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1519A | LT3695EMSE Demo Board | Fault-Tolerant, 6.9V ≤ VIN ≤ 36/60V, VOUT = 5V @ 1A | $100.00 | |
| DC1578A-A | LT3695EMSE-3.3 Demo Board | Fault-Tolerant, 4.5V ≤ VIN ≤ 36/60V, Vout = 3.3V @ 1A | $100.00 | |
| DC1578A-B | LT3695EMSE-5 Demo Board | Fault-Tolerant, 6.9V ≤ VIN ≤ 36/60V, Vout = 5V @ 1A | $100.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT3695HMSE-3.3#PBF | MS-16E | H | $5.51 | $3.86 | Yes | |
| LT3695HMSE-3.3#TRPBF | MS-16E | H | $3.92 | Yes | ||
| LT3695HMSE-5#PBF | MS-16E | H | $5.51 | $3.86 | Yes | |
| LT3695HMSE-5#TRPBF | MS-16E | H | $3.92 | Yes | ||
| LT3695HMSE#PBF | MS-16E | H | $5.51 | $3.86 | Yes | |
| LT3695HMSE#TRPBF | MS-16E | H | $3.92 | Yes | ||
| LT3695IMSE-3.3#PBF | MS-16E | I | $5.16 | $3.61 | Yes | |
| LT3695IMSE-3.3#TRPBF | MS-16E | I | $3.67 | Yes | ||
| LT3695IMSE-5#PBF | MS-16E | I | $5.16 | $3.61 | Yes | |
| LT3695IMSE-5#TRPBF | MS-16E | I | $3.67 | Yes | ||
| LT3695IMSE#PBF | MS-16E | I | $5.16 | $3.61 | Yes | |
| LT3695IMSE#TRPBF | MS-16E | I | $3.67 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Automotive Battery Regulation
- Automotive Entertainment Systems
- Distributed Supply Regulation
- Industrial Supplies
People Who Viewed This Product Also Viewed
- LT3682 - 1A Micropower Step-Down Switching Regulator
- LTC3646/LTC3646-1 - 40V, 1A Synchronous Step-Down Converter
- LT3080 - Adjustable 1.1A Single Resistor Low Dropout Regulator
- LT3502/LT3502A - 1.1MHz/2.2MHz, 500mA Step-Down Regulators in 2mm × 2mm DFN and MS10
- LT3988 - Dual 60V Monolithic 1A Step-Down Switching Regulator
- LT8610 - 42V, 2.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current
- LTC3630 - High Efficiency, 65V 500mA Synchronous Step-Down Converter
- LT3505 - 1.2A, Step-Down Switching Regulator in 3mm x 3mm DFN
- LT3971 - 38V, 1.2A, 2MHz Step-Down Regulator with 2.8μA Quiescent Current
- LT1763 - 500mA, Low Noise, LDO Micropower Regulators
Product Notifications
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.
Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.
Design Tools
LTspice
LTspice® software 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
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
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- Step 3: If LTspice 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:
LT3695
LT3695-3.3
LT3695-5
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
