Power Management
Switching Regulator
Step-Down (Buck) Regulators
Micropower Buck
Power Management
Switching Regulator
Step-Down (Buck) Regulators
Internal Power Switch Buck
Power Management
Switching Regulator
Step-Down (Buck) Regulators
High Input Voltage Buck
Space & Harsh Environment
Extended Temperature Plastic (H & MP)
Extended Temperature (H & MP) Switching Regulators
LT3970 Series - 40V, 350mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes
Features
- Low Ripple Burst Mode® Operation
2.5μA IQ at 12VIN to 3.3VOUT
Output Ripple < 5mVP-P - Wide Input Voltage Range: 4.2V to 40V Operating
- Adjustable Switching Frequency: 200kHz to 2.2MHz
- Integrated Boost and Catch Diodes
- 350mA Output Current
- Fixed Output Voltages: 3.3V, 3.42V, 5V
1.8μA IQ at 12VIN - Accurate 1V Enable Pin Threshold
- Low Shutdown Current: IQ = 0.7μA
- Internal Sense Limits Catch Diode Current
- Power Good Flag
- Output Voltage: 1.21V to 25V
- Internal Compensation
- Small 10-Pin MSOP and (3mm × 2mm) DFN Packages
Typical Application
Description
The LT3970 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 40V, and consumes only 2.5μA of quiescent current. A high efficiency switch is included on the die along with the catch diode, boost diode, and the necessary oscillator, control and logic circuitry. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output ripple below 5mV in atypical application. Current mode topology is used for fast transient response and good loop stability. A catch diode current limit provides protection against shorted outputs and overvoltage conditions. An enable pin with accurate threshold is available, producing a low shutdown current of 0.7μA. A power good flag signals when VOUT reaches90% of the programmed output voltage. The LT3970 is available in small 10-pin MSOP and 3mm × 2mm DFN packages.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
DFN-10, MS-10
Order Info
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- 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 | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
|---|---|---|---|---|---|---|
| LT3970EDDB#PBF | DFN | 10 | E | $3.36 | View | |
| LT3970EDDB#TRMPBF | DFN | 10 | E | $3.36 | $2.40 | View |
| LT3970EDDB#TRPBF | DFN | 10 | E | $3.36 | $2.35 | View |
| LT3970EDDB-3.3#PBF | DFN | 10 | E | $3.36 | View | |
| LT3970EDDB-3.3#TRMPBF | DFN | 10 | E | $3.36 | $2.40 | View |
| LT3970EDDB-3.3#TRPBF | DFN | 10 | E | $3.36 | $2.35 | View |
| LT3970EDDB-3.42#PBF | DFN | 10 | E | $3.36 | View | |
| LT3970EDDB-3.42#TRMPBF | DFN | 10 | E | $3.36 | $2.40 | View |
| LT3970EDDB-3.42#TRPBF | DFN | 10 | E | $3.36 | $2.35 | View |
| LT3970EDDB-5#PBF | DFN | 10 | E | $3.36 | View | |
| LT3970EDDB-5#TRMPBF | DFN | 10 | E | $3.36 | $2.40 | View |
| LT3970EDDB-5#TRPBF | DFN | 10 | E | $3.36 | $2.35 | View |
| LT3970EMS#PBF | MSOP | 10 | E | $3.43 | $2.40 | View |
| LT3970EMS#TRPBF | MSOP | 10 | E | $3.78 | $2.46 | View |
| LT3970EMS-3.3#PBF | MSOP | 10 | E | $3.43 | $2.40 | View |
| LT3970EMS-3.3#TRPBF | MSOP | 10 | E | $2.46 | View | |
| LT3970EMS-5#PBF | MSOP | 10 | E | $3.43 | $2.40 | View |
| LT3970EMS-5#TRPBF | MSOP | 10 | E | $2.46 | View | |
| LT3970HMS-3.3#PBF | MSOP | 10 | H | $4.17 | $2.92 | View |
| LT3970HMS-3.3#TRPBF | MSOP | 10 | H | $2.98 | View | |
| LT3970HMS-5#PBF | MSOP | 10 | H | $4.17 | $2.92 | View |
| LT3970HMS-5#TRPBF | MSOP | 10 | H | $2.98 | View | |
| LT3970IDDB#PBF | DFN | 10 | I | $3.73 | View | |
| LT3970IDDB#TRMPBF | DFN | 10 | I | $3.73 | $2.66 | View |
| LT3970IDDB#TRPBF | DFN | 10 | I | $3.73 | $2.61 | View |
| LT3970IDDB-3.3#PBF | DFN | 10 | I | $3.73 | View | |
| LT3970IDDB-3.3#TRMPBF | DFN | 10 | I | $3.73 | $2.66 | View |
| LT3970IDDB-3.3#TRPBF | DFN | 10 | I | $3.73 | $2.61 | View |
| LT3970IDDB-5#PBF | DFN | 10 | I | $3.73 | View | |
| LT3970IDDB-5#TRMPBF | DFN | 10 | I | $3.73 | $2.66 | View |
| LT3970IDDB-5#TRPBF | DFN | 10 | I | $3.73 | $2.61 | View |
| LT3970IMS#PBF | MSOP | 10 | I | $3.82 | $2.67 | View |
| LT3970IMS#TRPBF | MSOP | 10 | I | $4.22 | $2.73 | View |
| LT3970IMS-3.3#PBF | MSOP | 10 | I | $3.82 | $2.67 | View |
| LT3970IMS-3.3#TRPBF | MSOP | 10 | I | $2.73 | View | |
| LT3970IMS-5#PBF | MSOP | 10 | I | $3.82 | $2.67 | View |
| LT3970IMS-5#TRPBF | MSOP | 10 | I | $2.73 | View | |
| 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 |
|---|---|---|---|
| DC1566A | LT3970EMS Demo Board | 40V, 350mA Step-Down Regula | $75.00 | |
| Buy Now | |||
Applications
- Automotive Battery Regulation
- Power for Portable Products
- Industrial Supplies
People Who Viewed This Product Also Viewed
- LT3990 - 62V, 350mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes
- LT1934 - Micropower Step-Down Switching Regulators in ThinSOT
- LT3470 - Micropower Buck Regulator with Integrated Boost and Catch Diodes
- LTC3631 - High Efficiency, High Voltage 100mA Synchronous Step-Down Converter
- LTC3630 - High Efficiency, 65V 500mA Synchronous Step-Down Converter
- LT3973 - 42V, 750mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes
- LTC3115-1 - 40V, 2A Synchronous Buck-Boost DC/DC Converter
- LT3437 - High Voltage 500mA, 200kHz Step-Down Switching Regulator with 100µA Quiescent Current
- LT3502 - 1.1MHz/2.2MHz, 500mA Step-Down Regulators in 2mm x 2mm DFN and MS10
- LT8610 - 42V, 2.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current
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.
Simulate
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. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.
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.
Related models available in LTspice IV
LT3970-3.3
LT3970-5
LT3970
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.
