LT8650S
RECOMMENDED FOR NEW DESIGNSDual Channel 4A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2µA Quiescent Current
- Part Models
- 16
- 1ku List Price
- Starting From $8.57
Overview
- Silent Switcher®2 Architecture:
- Ultralow EMI on Any PCB
- Eliminates PCB Layout Sensitivity
- Internal Bypass Capacitors Reduce Radiated EMI
- Optional Spread Spectrum Modulation
- 4A DC from Each Channel Simultaneously
- Up to 6A on Either Channel
- Ultralow Quiescent Current Burst Mode® Operation:
- 6.2μA IQ Regulating 12VIN to 5VOUT1 and 3.3VOUT2
- Output Ripple <10mVP-P
- Optional External VC Pin: Fast Transient Response and Current Sharing (Extra 50µA IQ/Channel)
- Forced Continuous Mode
- High Efficiency at High Frequency
- 94.6% Efficiency at 2A, 5VOUT from 12VIN at 2MHz
- 93.3% Efficiency at 4A, 5VOUT from 12VIN at 2MHz
- Fast Minimum Switch-On Time: 40ns
- Wide Input Voltage Range: 3.0V to 42V
- Adjustable and Synchronizable: 300kHz to 3MHz
- Small 4mm × 6mm 32-Pin LQFN Package
- AEC-Q100 Qualified for Automotive Applications
The LT8650S is a dual step-down regulator that delivers up to 4A of continuous current from both channels and supports loads up to 6A from each channel. The LT8650S features the second generation Silent Switcher architecture to minimize EMI emissions while delivering high efficiency at high switching frequencies. This includes integration of bypass capacitors to optimize high frequency current loops 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 40ns minimum on-time allows high step down ratios at high switching frequencies.
Burst Mode operation features a 6.2μA quiescent current resulting in high efficiency at low output currents, forced continuous mode allows fixed switching frequency operation over the entire output load range, and spread spectrum operation can further reduce EMI emissions. External VC pins allow optimal loop compensation for fast transient response. The VC pins can also be used for current sharing and the CLKOUT pin enables synchronizing two LT8650S chips to generate a 4-phase, 16A supply.
Applications
- General Purpose Step-Down
- Automotive and Industrial Supplies
Documentation
Data Sheet 2
Design Note 3
Technical Articles 2
Video 2
Press Release 1
Radiation Report 4
Brochure 1
Book & eBook 1
Analog Dialogue 2
Webcast 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 |
|---|---|---|---|
| LT8650SEV#PBF | 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) | ||
| LT8650SEV#TRPBF | 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) | ||
| LT8650SEV#WPBF | 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) | ||
| LT8650SEV#WTRPBF | 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) | ||
| LT8650SHV#PBF | 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) | ||
| LT8650SHV#TRPBF | 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) | ||
| LT8650SHV#WPBF | 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) | ||
| LT8650SHV#WTRPBF | 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) | ||
| LT8650SHV-CSL#PBF | 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) | ||
| LT8650SHV-CSL#TRPBF | 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) | ||
| LT8650SIV#PBF | 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) | ||
| LT8650SIV#TRPBF | 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) | ||
| LT8650SIV#WPBF | 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) | ||
| LT8650SIV#WTRPBF | 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) | ||
| LT8650SJV#WPBF | 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) | ||
| LT8650SJV#WTRPBF | 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Aug 28, 2023 - 23_0172 Qualification of an Additional Substrate Supplier, SMT Attach Material and Pillar Size Change for LT8650S |
||
| LT8650SEV#PBF | PRODUCTION | |
| LT8650SEV#TRPBF | PRODUCTION | |
| LT8650SEV#WPBF | PRODUCTION | |
| LT8650SEV#WTRPBF | PRODUCTION | |
| LT8650SHV#PBF | PRODUCTION | |
| LT8650SHV#TRPBF | PRODUCTION | |
| LT8650SHV#WPBF | PRODUCTION | |
| LT8650SHV#WTRPBF | PRODUCTION | |
| LT8650SHV-CSL#PBF | PRODUCTION | |
| LT8650SHV-CSL#TRPBF | PRODUCTION | |
| LT8650SIV#PBF | PRODUCTION | |
| LT8650SIV#TRPBF | PRODUCTION | |
| LT8650SIV#WPBF | PRODUCTION | |
| LT8650SIV#WTRPBF | PRODUCTION | |
| LT8650SJV#WPBF | PRODUCTION | |
| LT8650SJV#WTRPBF | PRODUCTION | |
|
May 4, 2020 - 19_0263 LT8650S Component, Substrate Layout and Datasheet Specification Change |
||
| LT8650SEV#PBF | PRODUCTION | |
| LT8650SEV#WPBF | PRODUCTION | |
| LT8650SHV#WPBF | PRODUCTION | |
| LT8650SIV#PBF | PRODUCTION | |
| LT8650SIV#WPBF | PRODUCTION | |
| LT8650SJV#WPBF | PRODUCTION | |
|
Apr 11, 2019 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process |
||
| LT8650SEV#PBF | PRODUCTION | |
| LT8650SIV#PBF | 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
Tools & Simulations
LTspice 1
LTpowerCAD 1
Design tools for the following parts are available in LTpowerCAD:
- LT8650SP
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
LT8650S Demo Board | Dual Channel 42V, 4A Synchronous Step-Down Silent Switcher 2