LT3758 - High Input Voltage, Boost, Flyback, SEPIC and Inverting Controller
Features
- Wide Input Voltage Range: 5.5V to 100V
- Positive or Negative Output Voltage Programming with a Single Feedback Pin
- Current Mode Control Provides Excellent Transient Response
- Programmable Operating Frequency (100kHz to 1MHz) with One External Resistor
- Synchronizable to an External Clock
- Low Shutdown Current < 1μA
- Internal 7.2V Low Dropout Voltage Regulator
- Programmable Input Undervoltage Lockout with Hysteresis
- Programmable Soft-Start
- Small 10-Lead DFN (3mm × 3mm) and MSOPE Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LT®3758/LT3758A are wide input range, current mode, DC/DC controllers which are capable of generating either positive or negative output voltages. They can be configured as either a boost, flyback, SEPIC or inverting converter. The LT3758/LT3758A drive a low side external N-channel power MOSFET from an internal regulated 7.2V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages.
The operating frequency of LT3758/LT3758A can be set with an external resistor over a 100kHz to 1MHz range, and can be synchronized to an external clock using the SYNC pin. A minimum operating supply voltage of 5.5V, and a low shutdown quiescent current of less than 1μA, make the LT3758/LT3758A ideally suited for batterypowered systems.
The LT3758/LT3758A feature soft-start and frequency foldback functions to limit inductor current during start-up and output short-circuit. The LT3758A has improved load transient performance compared to the LT3758.
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 |
|---|---|---|---|---|---|
| LT3758AEDD#PBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LT3758AEDD#TRPBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LT3758AEMSE#PBF | MS-10E | MSE | E | 05-08-1664 | Yes |
| LT3758AEMSE#TRPBF | MS-10E | MSE | E | 05-08-1664 | Yes |
| LT3758AHMSE#PBF | MS-10E | MSE | H | 05-08-1664 | Yes |
| LT3758AHMSE#TRPBF | MS-10E | MSE | H | 05-08-1664 | Yes |
| LT3758AIDD#PBF | 3x3 DFN-10 | DD | I | 05-08-1699 | Yes |
| LT3758AIDD#TRPBF | 3x3 DFN-10 | DD | I | 05-08-1699 | Yes |
| LT3758AIMSE#PBF | MS-10E | MSE | I | 05-08-1664 | Yes |
| LT3758AIMSE#TRPBF | MS-10E | MSE | I | 05-08-1664 | Yes |
| LT3758AMPMSE#PBF | MS-10E | MSE | MP | 05-08-1664 | Yes |
| LT3758AMPMSE#TRPBF | MS-10E | MSE | MP | 05-08-1664 | Yes |
| LT3758EDD#PBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LT3758EDD#TRPBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LT3758EMSE#PBF | MS-10E | MSE | E | 05-08-1664 | Yes |
| LT3758EMSE#TRPBF | MS-10E | MSE | E | 05-08-1664 | Yes |
| LT3758HMSE#PBF | MS-10E | MSE | H | 05-08-1664 | Yes |
| LT3758HMSE#TRPBF | MS-10E | MSE | H | 05-08-1664 | Yes |
| LT3758IDD#PBF | 3x3 DFN-10 | DD | I | 05-08-1699 | Yes |
| LT3758IDD#TRPBF | 3x3 DFN-10 | DD | I | 05-08-1699 | Yes |
| LT3758IMSE#PBF | MS-10E | MSE | I | 05-08-1664 | Yes |
| LT3758IMSE#TRPBF | MS-10E | MSE | I | 05-08-1664 | Yes |
| LT3758MPMSE | MS-10E | MSE | MP | 05-08-1664 | No |
| LT3758MPMSE#PBF | MS-10E | MSE | MP | 05-08-1664 | Yes |
| LT3758MPMSE#TR | MS-10E | MSE | MP | 05-08-1664 | No |
| LT3758MPMSE#TRPBF | MS-10E | MSE | MP | 05-08-1664 | 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
sales office or authorized distributor.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 |
|---|---|---|---|
| DC1342B | LT3758EMSE Demo Board | SEPIC, Vin: 18V to 72V, Vout: 24V/1A, (3x3 QFN) | $125.00 | |
| DC1412A | LT3758MSE Demo Board | Flyback, Vin: 18V to 75V, Vout: 3.3V/3A, (3x3 QFN) | $125.00 | |
| 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 | |
|---|---|---|---|---|---|---|
| LT3758AHMSE#PBF | MS-10E | H | $4.11 | $2.88 | Yes | |
| LT3758AHMSE#TRPBF | MS-10E | H | $2.94 | Yes | ||
| LT3758AIDD#PBF | 3x3 DFN-10 | I | $3.62 | $2.53 | Yes | |
| LT3758AIDD#TRPBF | 3x3 DFN-10 | I | $2.59 | Yes | ||
| LT3758AIMSE#PBF | MS-10E | I | $3.62 | $2.53 | Yes | |
| LT3758AIMSE#TRPBF | MS-10E | I | $2.59 | Yes | ||
| LT3758AMPMSE#PBF | MS-10E | MP | $9.77 | $6.84 | Yes | |
| LT3758AMPMSE#TRPBF | MS-10E | MP | $6.90 | Yes | ||
| LT3758HMSE#PBF | MS-10E | H | $4.11 | $2.88 | Yes | |
| LT3758HMSE#TRPBF | MS-10E | H | $2.94 | Yes | ||
| LT3758IDD#PBF | 3x3 DFN-10 | I | $3.62 | $2.53 | Yes | |
| LT3758IDD#TRPBF | 3x3 DFN-10 | I | $2.59 | Yes | ||
| LT3758IMSE#PBF | MS-10E | I | $3.62 | $2.53 | Yes | |
| LT3758IMSE#TRPBF | MS-10E | I | $2.59 | Yes | ||
| LT3758MPMSE#PBF | MS-10E | MP | $9.77 | $6.84 | Yes | |
| LT3758MPMSE#TRPBF | MS-10E | MP | $6.90 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Automotive
- Telecom
- Industrial
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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
- LT3758 Demo Circuit - High Input Voltage Flyback Controller (48V to 5V @ 2A)
- LT3758 Demo Circuit - High Efficiency SEPIC Converter (8-72V to 12V @ 2A)
- LT3758 Demo Circuit - Automotive, Telecom & Industrial Isolated Flyback Converter (18-72V to 5V @ 2A)
- LT3758 Demo Circuit - High Efficiency SEPIC Converter (18-72V to 24V @ 1A)
- 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:
LT3758
LT3758A
LTpowerCAD
The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD
Design tools for the following parts are available in LTpowerCAD:
LT3758
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.
