LT8614
PRODUCTION42V, 4A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current
- Part Models
- 12
- 1ku List Price
- Starting From $6.42
Overview
- Silent Switcher® Architecture
- Ultralow EMI Emissions
- High Efficiency at High Frequency
- Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT
- Up to 94% Efficiency at 2MHz, 12VIN to 5VOUT
- Wide Input Voltage Range: 3.4V to 42V
- Ultralow Quiescent Current Burst Mode® Operation:
- 2.5μA IQ Regulating 12VIN to 3.3VOUT
- Output Ripple < 10mVP-P
- Fast Minimum Switch On-Time: 30ns
- Low Dropout Under All Conditions: 125mV at 1A
- Safely Tolerates Inductor Saturation in Overload
- Adjustable and Synchronizable: 200kHz to 3MHz
- Peak Current Mode Operation
- Accurate 1V Enable Pin Threshold
- Internal Compensation
- Output Soft-Start and Tracking
- Small 18-Lead 3mm × 4mm QFN
- AEC-Q100 Qualified for Automotive Applications
The LT8614 step-down regulator features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at frequencies up to 3MHz. Assembled in a 3mm × 4mm QFN, the monolithic construction with integrated power switches and inclusion of all necessary circuitry yields a solution with a minimal PCB footprint. An ultralow 2.5μA quiescent current—with the output in full regulation— enables applications requiring highest efficiency at very small load currents. Transient response remains excellent and output voltage ripple is below 10mVP-P at any load, from zero to full current.
The LT8614 allows high VIN to low VOUT conversion at high frequency with a fast minimum top switch on-time of 30ns. Operation is safe in overload even with a saturated inductor.
Essential features are included and easy to use: An open-drain PG pin signals when the output is in regulation. The SYNC pin allows clock synchronization and choice of Burst Mode operation or pulse-skipping mode. Soft-start and tracking functionality is accessed via the TR/SS pin. An accurate enable threshold can be set using the EN/UV pin and a resistor at the RT pin programs switch frequency.
Applications
- Automotive and Industrial Supplies
- General Purpose Step-Down
- GSM Power Supplies
Documentation
Data Sheet 1
User Guide 1
Application Note 1
Technical Articles 5
Brochure 2
Book & eBook 1
Webcast 4
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 |
|---|---|---|---|
| LT8614EUDC#PBF | 20(18)-Lead QFN (3mm x 4mm x 0.75mm w/ EP) | ||
| LT8614EUDC#TRPBF | 20(18)-Lead QFN (3mm x 4mm x 0.75mm w/ EP) | ||
| LT8614EUDC#WPBF | 20(18)-Lead QFN (3mm x 4mm x 0.75mm w/ EP) | ||
| LT8614EUDC#WTRPBF | 20(18)-Lead QFN (3mm x 4mm x 0.75mm w/ EP) | ||
| LT8614HUDC#PBF | 20(18)-Lead QFN (3mm x 4mm x 0.75mm w/ EP) | ||
| LT8614HUDC#TRPBF | 20(18)-Lead QFN (3mm x 4mm x 0.75mm w/ EP) | ||
| LT8614HUDC#WPBF | 20(18)-Lead QFN (3mm x 4mm x 0.75mm w/ EP) | ||
| LT8614HUDC#WTRPBF | 20(18)-Lead QFN (3mm x 4mm x 0.75mm w/ EP) | ||
| LT8614IUDC#PBF | 20(18)-Lead QFN (3mm x 4mm x 0.75mm w/ EP) | ||
| LT8614IUDC#TRPBF | 20(18)-Lead QFN (3mm x 4mm x 0.75mm w/ EP) | ||
| LT8614IUDC#WPBF | 20(18)-Lead QFN (3mm x 4mm x 0.75mm w/ EP) | ||
| LT8614IUDC#WTRPBF | 20(18)-Lead QFN (3mm x 4mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Sep 30, 2020 - 20_0293 Test Site Transfer from Analog Devices Singapore to UTAC Thailand |
||
| LT8614EUDC#PBF | PRODUCTION | |
| LT8614EUDC#TRPBF | PRODUCTION | |
| LT8614HUDC#PBF | PRODUCTION | |
| LT8614HUDC#TRPBF | PRODUCTION | |
| LT8614IUDC#PBF | PRODUCTION | |
| LT8614IUDC#TRPBF | PRODUCTION | |
|
Apr 11, 2019 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process |
||
| LT8614EUDC#PBF | PRODUCTION | |
| LT8614EUDC#TRPBF | PRODUCTION | |
| LT8614HUDC#PBF | PRODUCTION | |
| LT8614HUDC#TRPBF | PRODUCTION | |
| LT8614IUDC#PBF | PRODUCTION | |
| LT8614IUDC#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
| Parts | Product Life Cycle | Description |
|---|---|---|
| Hot Swap Controllers 1 | ||
| LTC4364 | RECOMMENDED FOR NEW DESIGNS | Surge Stopper with Ideal Diode |
| Ideal Diodes and PowerPath Controllers 1 | ||
| LTC4417 | RECOMMENDED FOR NEW DESIGNS | Prioritized PowerPath™ Controller |
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2977 | RECOMMENDED FOR NEW DESIGNS | 8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement |
| Parts | Product Life Cycle | Description |
|---|---|---|
|
LT8640 LT8640-1 |
42V, 5A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current |
Tools & Simulations
LTspice 3
- LT8614/LT6015 Demo Circuit - Hybrid Wide Dimming Ratio Linear LED Current Controller (3.4-42V to 41V @ 3A Max)
- LT8614/LT3083 Demo Circuit - Hybrid Wide Dimming Ratio Linear LED Current Controller (3.4-42V to 41V @ 3A Max)
- LT8614 Demo Circuit - Ultralow EMI, µPower Buck Converter (5.8-42V to 5V @ 4A)
Models for the following parts are available in LTspice:
- LT8614
LTpowerCAD 1
Design tools for the following parts are available in LTpowerCAD:
- LT8614
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.
