LT8612
PRODUCTION42V, 6A Synchronous Step-Down Regulator with 3μA Quiescent Current
- Part Models
- 8
- 1ku List Price
- Starting From $7.47
Overview
- Wide Input Voltage Range: 3.4V to 42V
- Ultralow Quiescent Current Burst Mode® Operation:
- 3μA IQ Regulating 12VIN to 3.3VOUT
- Output Ripple < 10mVP-P
- 3μA IQ Regulating 12VIN to 3.3VOUT
- High Efficiency Synchronous Operation:
- 95% Efficiency at 3A, 5VOUT from 12VIN
- 94% Efficiency at 3A, 3.3VOUT from 12VIN
- 95% Efficiency at 3A, 5VOUT from 12VIN
- Fast Minimum Switch-On-Time: 40ns
- Low Dropout Under All Conditions: 250mV at 3A
- Allows Use Of Small Inductors
- Safely Tolerates Inductor Saturation in Overload Conditions
- Adjustable and Synchronizable: 200kHz to 2.2MHz
- Current Mode Operation
- Accurate 1V Enable Pin Threshold
- Internal Compensation
- Output Soft-Start and Tracking
- Small Thermally Enhanced 3mm × 6mm 28-Lead QFN Package
- AEC-Q100 Qualified for Automotive Applications
The LT8612 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 3μA of quiescent current. Top and bottom power switches are included with all necessary circuitry to minimize the need for external components. Low ripple Burst Mode operation enables high efficiency down to very low output currents while keeping the output ripple below 10mVP-P. A SYNC pin allows synchronization to an external clock. Internal compensation with peak current mode topology allows the use of small inductors and results in fast transient response and good loop stability. The EN/UV pin has an accurate 1V threshold and can be used to program VIN undervoltage lockout or to shut down the LT8612 reducing the input supply current to 1μA. A capacitor on the TR/SS pin programs the output voltage ramp rate during start-up. The PG flag signals when VOUT is within ±9% of the programmed output voltage as well as fault conditions. The LT8612 is available in a small 3mm × 6mm 28-lead QFN package with exposed pad for low thermal resistance.
APPLICATIONS
- Automotive and Industrial Supplies
- General Purpose Step-Down
- GSM Power Supplies
Documentation
Data Sheet 1
User Guide 2
Design Note 1
Technical Articles 2
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 |
|---|---|---|---|
| LT8612EUDE#PBF | 28-Lead QFN (3mm x 6mm x 0.75mm w/ EP) | ||
| LT8612EUDE#TRPBF | 28-Lead QFN (3mm x 6mm x 0.75mm w/ EP) | ||
| LT8612EUDE#WPBF | 28-Lead QFN (3mm x 6mm x 0.75mm w/ EP) | ||
| LT8612EUDE#WTRPBF | 28-Lead QFN (3mm x 6mm x 0.75mm w/ EP) | ||
| LT8612IUDE#PBF | 28-Lead QFN (3mm x 6mm x 0.75mm w/ EP) | ||
| LT8612IUDE#TRPBF | 28-Lead QFN (3mm x 6mm x 0.75mm w/ EP) | ||
| LT8612IUDE#WPBF | 28-Lead QFN (3mm x 6mm x 0.75mm w/ EP) | ||
| LT8612IUDE#WTRPBF | 28-Lead QFN (3mm x 6mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 17, 2025 - 25_0043 Change of Gold to Copper Wire and BOM (Automotive) |
||
| LT8612IUDE#WPBF | PRODUCTION | |
| LT8612IUDE#WTRPBF | 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
| Parts | Product Life Cycle | Description |
|---|---|---|
| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
Tools & Simulations
LTspice 2
- LT3081/LT8612/LTC3632/LT3092 Demo Circuit - Constant Voltage, Constant Current Bench Supply (10-40V to 0-25V @ 0-3.1A)
- LT8612 Demo Circuit - µPower Buck Converter (5.8-42V to 5V @ 6A)
Models for the following parts are available in LTspice:
- LT8612
LTpowerCAD 1
Design tools for the following parts are available in LTpowerCAD:
- LT8612
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.
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
Evaluation Kits
Reference Designs
75 Watt, Single-Output Benchtop Power Supply
Part Used
Design & Integration Tools
Part Used
