LT3980
PRODUCTION58V, 2A, 2.4MHz Step-Down Switching Regulator with 85μA Quiescent Current
- Part Models
- 10
- 1ku List Price
- Starting From $5.38
Overview
- Wide Input Range: Operation from 3.6V to 58V
- Overvoltage Lockout Protects Circuits Through 80V Transients
- 2A Maximum Output Current
- Low Ripple (<15mVP-P) Burst Mode® Operation: IQ = 85μA at 12VIN to 3.3VOUT
- Adjustable Switching Frequency: 100kHz to 2.4MHz
- Low Shutdown Current: IQ < 1μA
- Catch Diode Current Sense Protects Circuit Through Short-Circuit and Input Overvoltage
- Synchronizable Between 250kHz to 2MHz
- Power Good Flag
- Saturating Switch Design: 200mΩ On-Resistance
- Thermal Protection
- Soft-Start Capability
- Small 16-Pin Thermally Enhanced MSOP and 3mm × 4mm DFN Packages
The LT3980 is an adjustable frequency (100kHz to 2.4MHz) monolithic buck switching regulator that accepts input voltages up to 58V (80V transient). A high efficiency 200mΩ 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. Catch diode current sense (DA pin) protects the circuit during input voltage transients even when a high switching frequency is used. 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 LT3980 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 LT3980 is available in 16-pin MSOP and 3mm × 4mm 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 |
|---|---|---|---|
| LT3980EDE#PBF | 14-Lead DFN (4mm x 3mm w/ EP) | ||
| LT3980EDE#TRPBF | 14-Lead DFN (4mm x 3mm w/ EP) | ||
| LT3980EMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3980EMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LT3980HMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3980HMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LT3980IDE#PBF | 14-Lead DFN (4mm x 3mm w/ EP) | ||
| LT3980IDE#TRPBF | 14-Lead DFN (4mm x 3mm w/ EP) | ||
| LT3980IMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3980IMSE#TRPBF | 16-Lead MSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package |
||
| LT3980EMSE#PBF | PRODUCTION | |
| LT3980EMSE#TRPBF | PRODUCTION | |
| LT3980HMSE#PBF | PRODUCTION | |
| LT3980HMSE#TRPBF | PRODUCTION | |
|
Apr 18, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices |
||
| LT3980EMSE#PBF | PRODUCTION | |
| LT3980EMSE#TRPBF | PRODUCTION | |
| LT3980HMSE#PBF | PRODUCTION | |
| LT3980HMSE#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LT3980EMSE#PBF | PRODUCTION | |
| LT3980EMSE#TRPBF | PRODUCTION | |
| LT3980HMSE#PBF | PRODUCTION | |
| LT3980HMSE#TRPBF | PRODUCTION | |
| LT3980IMSE#PBF | PRODUCTION | |
| LT3980IMSE#TRPBF | PRODUCTION | |
|
Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LT3980IDE#PBF | PRODUCTION | |
| LT3980IDE#TRPBF | PRODUCTION | |
|
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2) |
||
| LT3980IMSE#PBF | PRODUCTION | |
| LT3980IMSE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
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Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3980
LTpowerCAD
Design tools for the following parts are available in LTpowerCAD:
- LT3980
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
LT3980EMSE Demo Board | 6.8V ≤ VIN ≤ 58V (80V Transients), VOUT = 5V @ 2A
Resources
Reference Designs
