LT3972
PRODUCTION33V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75μA Quiescent Current
- Part Models
- 10
- 1ku List Price
- Starting From $6.42
Overview
- Wide Input Range:
- Operation from 3.6V to 33V
- Over-Voltage Lockout Protects Circuits Through 62V Transients
- 3.5A Maximum Output Current
- Low Ripple (<15mVP-P) Burst Mode® Operation: IQ= 75μA at 12VIN to 3.3VOUT
- Adjustable Switching Frequency: 200kHz to 2.4MHz
- Low Shutdown Current: IQ < 1μA
- Integrated Boost Diode
- Synchronizable Between 250kHz to 2MHz
- Power Good Flag
- Saturating Switch Design: 95mΩ On-Resistance
- Output Voltage: 0.79V to 30V
- Thermal Protection
- Soft-Start Capability
- Small 10-Pin Thermally Enhanced MSOP and (3mm × 3mm) DFN Packages
The LT3972 is an adjustable frequency (200kHz to 2.4MHz) monolithic buck switching regulator that accepts input voltages up to 33V (62V Maximum). A high efficiency 95mΩ switch is included on the die along with a boost Schottky 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. In addition, the LT3972 can further enhance low output current efficiency by drawing bias current from the output when VOUT is above 3V 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). A power good flag signals when VOUT reaches 91% of the programmed output voltage. The LT3972 is available in 10-Pin MSOP and 3mm × 3mm DFN packages with exposed pads for low thermal resistance.
Applications
- Automotive Battery Regulation
- Distributed Supply Regulation
- Industrial Supplies
- Wall Transformer Regulation
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 |
|---|---|---|---|
| LT3972EDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT3972EDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT3972EMSE#PBF | 10-Lead MSOP w/ EP | ||
| LT3972EMSE#TRPBF | 10-Lead MSOP w/ EP | ||
| LT3972HMSE#PBF | 10-Lead MSOP w/ EP | ||
| LT3972HMSE#TRPBF | 10-Lead MSOP w/ EP | ||
| LT3972IDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT3972IDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT3972IMSE#PBF | 10-Lead MSOP w/ EP | ||
| LT3972IMSE#TRPBF | 10-Lead MSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 17, 2025 - 25_0043 Change of Gold to Copper Wire and BOM (Automotive) |
||
| LT3972EDD#PBF | PRODUCTION | |
| LT3972EDD#TRPBF | PRODUCTION | |
| LT3972IDD#PBF | PRODUCTION | |
| LT3972IDD#TRPBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package |
||
| LT3972EMSE#PBF | PRODUCTION | |
| LT3972EMSE#TRPBF | PRODUCTION | |
| LT3972HMSE#PBF | PRODUCTION | |
| LT3972HMSE#TRPBF | PRODUCTION | |
| LT3972IMSE#PBF | PRODUCTION | |
| LT3972IMSE#TRPBF | PRODUCTION | |
|
Jul 12, 2022 - 22_0157 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM] |
||
| LT3972EMSE#PBF | PRODUCTION | |
| LT3972EMSE#TRPBF | PRODUCTION | |
| LT3972IMSE#PBF | PRODUCTION | |
| LT3972IMSE#TRPBF | PRODUCTION | |
|
Jun 21, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices |
||
| LT3972EMSE#PBF | PRODUCTION | |
| LT3972EMSE#TRPBF | PRODUCTION | |
| LT3972IMSE#PBF | PRODUCTION | |
| LT3972IMSE#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LT3972EMSE#PBF | PRODUCTION | |
| LT3972EMSE#TRPBF | PRODUCTION | |
| LT3972HMSE#PBF | PRODUCTION | |
| LT3972HMSE#TRPBF | PRODUCTION | |
| LT3972IMSE#PBF | PRODUCTION | |
| LT3972IMSE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
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Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3972
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
LT3972EMSE Demo Board | 6.3V ≤ VIN ≤ 33V (62V Transients), VOUT = 5V @ 3.5A