LT3970 Series

RECOMMENDED FOR NEW DESIGNS

40V, 350mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes

Data Sheet (Rev. D) Product Selection Table

Part Models: 50
1ku List Price: Starting From $2.82

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Part Details

Low Ripple Burst Mode^® Operation
- 2.5µA I_Q at 12V_IN to 3.3V_OUT
- Output Ripple < 5mV_P-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 I_Q at 12V_IN

Accurate 1V Enable Pin Threshold
Low Shutdown Current: I_Q = 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
AEC-Q100 Qualified for Automotive Applications

Part Models: 50
1ku List Price: Starting From $2.82

Documentation

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
LT3970EDDB#TRMPBF	10-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EDDB#TRPBF	10-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EDDB-3.3#TRMPBF	10-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EDDB-3.3#TRPBF	10-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EDDB-3.42#TRMPBF	10-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EDDB-3.42#TRPBF	10-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EDDB-5#TRMPBF	10-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EDDB-5#TRPBF	10-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EMS#PBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EMS#TRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EMS#WPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EMS#WTRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EMS-3.3#PBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EMS-3.3#TRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EMS-3.3#WPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EMS-3.3#WTRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EMS-5#PBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EMS-5#TRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EMS-5#WPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970EMS-5#WTRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970HMS#PBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970HMS#TRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970HMS#WPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970HMS#WTRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970HMS-3.3#PBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970HMS-3.3#TRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970HMS-3.3#WPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970HMS-3.3#WTRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970HMS-5#PBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970HMS-5#TRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970HMS-5#WPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970HMS-5#WTRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IDDB#TRMPBF	10-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IDDB#TRPBF	10-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IDDB-3.3#TRMPBF	10-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IDDB-3.3#TRPBF	10-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IDDB-5#TRMPBF	10-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IDDB-5#TRPBF	10-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IMS#PBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IMS#TRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IMS#WPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IMS#WTRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IMS-3.3#PBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IMS-3.3#TRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IMS-3.3#WPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IMS-3.3#WTRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IMS-5#PBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IMS-5#TRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IMS-5#WPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3970IMS-5#WTRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT3970EMS#PBF	PRODUCTION
LT3970EMS#TRPBF	PRODUCTION
LT3970EMS#WPBF	PRODUCTION
LT3970EMS#WTRPBF	PRODUCTION
LT3970EMS-3.3#WPBF	PRODUCTION
LT3970EMS-3.3#WTRPBF	PRODUCTION
LT3970EMS-5#PBF	PRODUCTION
LT3970EMS-5#TRPBF	PRODUCTION
LT3970EMS-5#WPBF	PRODUCTION
LT3970EMS-5#WTRPBF	PRODUCTION
LT3970HMS#WPBF	PRODUCTION
LT3970HMS#WTRPBF	PRODUCTION
LT3970HMS-3.3#PBF	PRODUCTION
LT3970HMS-3.3#TRPBF	PRODUCTION
LT3970HMS-3.3#WPBF	PRODUCTION
LT3970HMS-3.3#WTRPBF	PRODUCTION
LT3970HMS-5#PBF	PRODUCTION
LT3970HMS-5#TRPBF	PRODUCTION
LT3970HMS-5#WPBF	PRODUCTION
LT3970HMS-5#WTRPBF	PRODUCTION
LT3970IMS#WPBF	PRODUCTION
LT3970IMS#WTRPBF	PRODUCTION
LT3970IMS-3.3#WPBF	PRODUCTION
LT3970IMS-3.3#WTRPBF	PRODUCTION
LT3970IMS-5#WPBF	PRODUCTION
LT3970IMS-5#WTRPBF	PRODUCTION
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0130_Form Material_Report
LT3970EMS#PBF	PRODUCTION
LT3970EMS#TRPBF	PRODUCTION
LT3970EMS#WPBF	PRODUCTION
LT3970EMS#WTRPBF	PRODUCTION
LT3970EMS-3.3#PBF	PRODUCTION
LT3970EMS-3.3#TRPBF	PRODUCTION
LT3970EMS-3.3#WPBF	PRODUCTION
LT3970EMS-3.3#WTRPBF	PRODUCTION
LT3970EMS-5#PBF	PRODUCTION
LT3970EMS-5#TRPBF	PRODUCTION
LT3970EMS-5#WPBF	PRODUCTION
LT3970EMS-5#WTRPBF	PRODUCTION
LT3970HMS#PBF	PRODUCTION
LT3970HMS#TRPBF	PRODUCTION
LT3970HMS#WPBF	PRODUCTION
LT3970HMS#WTRPBF	PRODUCTION
LT3970HMS-3.3#PBF	PRODUCTION
LT3970HMS-3.3#TRPBF	PRODUCTION
LT3970HMS-3.3#WPBF	PRODUCTION
LT3970HMS-3.3#WTRPBF	PRODUCTION
LT3970HMS-5#PBF	PRODUCTION
LT3970HMS-5#TRPBF	PRODUCTION
LT3970HMS-5#WPBF	PRODUCTION
LT3970HMS-5#WTRPBF	PRODUCTION
LT3970IMS#PBF	PRODUCTION
LT3970IMS#TRPBF	PRODUCTION
LT3970IMS#WPBF	PRODUCTION
LT3970IMS#WTRPBF	PRODUCTION
LT3970IMS-3.3#PBF	PRODUCTION
LT3970IMS-3.3#TRPBF	PRODUCTION
LT3970IMS-3.3#WPBF	PRODUCTION
LT3970IMS-3.3#WTRPBF	PRODUCTION
LT3970IMS-5#PBF	PRODUCTION
LT3970IMS-5#TRPBF	PRODUCTION
LT3970IMS-5#WPBF	PRODUCTION
LT3970IMS-5#WTRPBF	PRODUCTION
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package
		PCN22_0244_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT3970EMS#WPBF	PRODUCTION
LT3970EMS#WTRPBF	PRODUCTION
LT3970EMS-3.3#PBF	PRODUCTION
LT3970EMS-3.3#TRPBF	PRODUCTION
LT3970EMS-3.3#WPBF	PRODUCTION
LT3970EMS-3.3#WTRPBF	PRODUCTION
LT3970HMS#PBF	PRODUCTION
LT3970HMS#TRPBF	PRODUCTION
LT3970HMS#WPBF	PRODUCTION
LT3970HMS#WTRPBF	PRODUCTION
LT3970HMS-3.3#WPBF	PRODUCTION
LT3970HMS-3.3#WTRPBF	PRODUCTION
LT3970IMS#PBF	PRODUCTION
LT3970IMS#TRPBF	PRODUCTION
LT3970IMS#WPBF	PRODUCTION
LT3970IMS#WTRPBF	PRODUCTION
LT3970IMS-3.3#PBF	PRODUCTION
LT3970IMS-3.3#TRPBF	PRODUCTION
LT3970IMS-3.3#WPBF	PRODUCTION
LT3970IMS-3.3#WTRPBF	PRODUCTION
LT3970IMS-5#PBF	PRODUCTION
LT3970IMS-5#TRPBF	PRODUCTION
Apr 18, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices
		PCN22_0050_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT3970EMS#WPBF	PRODUCTION
LT3970EMS#WTRPBF	PRODUCTION
LT3970EMS-3.3#PBF	PRODUCTION
LT3970EMS-3.3#TRPBF	PRODUCTION
LT3970EMS-3.3#WPBF	PRODUCTION
LT3970EMS-3.3#WTRPBF	PRODUCTION
LT3970EMS-5#WPBF	PRODUCTION
LT3970EMS-5#WTRPBF	PRODUCTION
LT3970HMS#PBF	PRODUCTION
LT3970HMS#TRPBF	PRODUCTION
LT3970HMS#WPBF	PRODUCTION
LT3970HMS#WTRPBF	PRODUCTION
LT3970HMS-3.3#WPBF	PRODUCTION
LT3970HMS-3.3#WTRPBF	PRODUCTION
LT3970HMS-5#WPBF	PRODUCTION
LT3970HMS-5#WTRPBF	PRODUCTION
LT3970IMS#PBF	PRODUCTION
LT3970IMS#TRPBF	PRODUCTION
LT3970IMS#WPBF	PRODUCTION
LT3970IMS#WTRPBF	PRODUCTION
LT3970IMS-3.3#PBF	PRODUCTION
LT3970IMS-3.3#TRPBF	PRODUCTION
LT3970IMS-3.3#WPBF	PRODUCTION
LT3970IMS-3.3#WTRPBF	PRODUCTION
LT3970IMS-5#PBF	PRODUCTION
LT3970IMS-5#TRPBF	PRODUCTION
LT3970IMS-5#WPBF	PRODUCTION
LT3970IMS-5#WTRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LT3970
LT3970-3.3
LT3970-5

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

LT3970EMS Demo Board | 40V, 350mA Step-Down Regulator with 2uA Quiescent Current and Integrated Diodes

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Product Details

Demonstration circuit 1566 is a monolithic stepdown DC/DC switching regulator featuring the LT3970. The switching frequency is adjustable up to 2MHz. The demo circuit is designed for 5V, 350mA output from a 6V to 40V input. The wide input range of the LT3970 allows a variety of input sources including automotive batteries and 24V industrial supplies. Low ripple Burst Mode increases the efficiency at the light load while keeping the output ripple below 15mV. The part is in shutdown when the EN pin is low and active when the pin is high. The threshold of the EN pin is accurate at 1V when Vin is above 4.2V. Adding a resistor divider from Vin to EN can program the LT3970 to regulate the
output only when Vin is above a desired voltage. The catch diode and boost diode are integrated to reduce the components count and solution size. The circuit consumes only 2μA of quiescent current. The current mode control scheme creates fast transient response and good loop stability. The catch diode current is limited to protect the part under short circuit and overvoltage conditions.