LT8642S
RECOMMENDED FOR NEW DESIGNS
18V, 10A Synchronous Step-Down Silent Switcher 2
- Part Models
- 4
- 1ku List Price
- Starting From $6.18
Overview
- Silent Switcher®2 Architecture
- Ultralow EMI Emissions On Any PCB
- Eliminates PCB Layout Sensitivity
- Internal Bypass Capacitors Reduce Radiated EMI
- Optional Spread Spectrum Modulation
- High Efficiency at High Frequency
- Up to 96% Efficiency at 1MHz, 12VIN to 3.3VOUT
- Up to 95% Efficiency at 2MHz, 12VIN to 3.3VOUT
- Wide Input Voltage Range: 2.8V to 18V
- 10A Output Current
- External Compensation: Fast Transient Response and Current Sharing
- Low Quiescent Current Burst Mode® Operation
- 240µA IQ Regulating 12VIN to 1.2VOUT
- Output Ripple < 10mVP-P
- Fast Minimum Switch On-Time: 25ns
- Low Dropout Under All Conditions: 50mV at 1A
- Forced Continuous Mode
- Adjustable and Synchronizable: 200kHz to 3MHz
- Output Soft-Start and Power Good
- Small 24-Lead 4mm × 4mm LQFN Package
The LT8642S synchronous step-down regulator features second generation Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. This includes the integration of bypass capacitors to optimize all the fast current loops inside and make it easy to achieve advertised EMI performance by eliminating layout sensitivity.
The fast, clean, low-overshoot switching edges enable high efficiency operation even at high switching frequencies, leading to a small overall solution size. Peak current mode control with a 20ns minimum on-time allows high step down ratios even at high switching frequencies. External compensation via the VC pin allows for fast transient response at high switching frequencies. A CLKOUT pin enables synchronizing other regulators to the LT8642S.
Burst Mode operation enables low standby current consumption, forced continuous mode can control frequency harmonics across the entire output load range, or spread spectrum operation can further reduce EMI emissions. Soft-start and tracking functionality is accessed via the SS pin, and an accurate input voltage UVLO threshold can be set using the EN/UV pin.
APPLICATIONS
- Server Power Applications
- Automotive and Industrial Supplies
- General Purpose Step-Down
Documentation
Data Sheet 1
User Guide 1
Technical Articles 3
Video 1
Book & eBook 1
LT Journal 1
Brochure 1
Analog Dialogue 3
Webcast 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 |
|---|---|---|---|
| LT8642SEV#PBF | 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) | ||
| LT8642SEV#TRPBF | 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) | ||
| LT8642SIV#PBF | 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) | ||
| LT8642SIV#TRPBF | 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 11, 2019 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process |
||
| LT8642SEV#PBF | PRODUCTION | |
| LT8642SIV#PBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareTools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LT8642-1
- LT8642S
LTpowerCAD 2
- LT8642S Project - DC2560A 3-18Vin to 1.2V/10A, 2MHz
- LT8642S LTpowerAnalyzer Example - 12Vin to 1.2Vout 10A
Design tools for the following parts are available in LTpowerCAD:
- LT8642S
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
18V, 10A Synchronous Step-Down Silent Switcher 2