LT8643S-2
RECOMMENDED FOR NEW DESIGNS42V, 6A Synchronous Step-Down Silent Switcher with 2.5µA Quiescent Current with External Compensation
- Part Models
- 10
- 1ku List Price
- Starting From $6.93
Overview
- Silent Switcher® Architecture
- Ultralow EMI Emissions
- Optional Spread Spectrum Modulation
- High Efficiency at High Frequency
- Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT
- Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT
- Wide Input Voltage Range: 3.4V to 42V
- 6A Maximum Continuous, 7A Peak Output
- External Compensation: Fast Transient Response and Current Sharing (LT8643S-2)
- Fast Minimum Switch On-Time: 30ns
- Ultralow Quiescent Current Burst Mode® Operation
- 2.5μA IQ Regulating 12VIN to 3.3VOUT (LT8640S-2)
- Output Ripple < 10mVP-P
- Low Dropout Under All Conditions: 100mV at 1A
- Forced Continuous Mode
- Adjustable and Synchronizable: 200kHz to 3MHz
- Output Soft-Start and Tracking
- Small 24-Lead 4mm × 4mm LQFN Package
- AEC-Q100 Qualified for Automotive Applications
The LT8640S-2/LT8643S-2 synchronous step-down regulator features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. Peak current mode control with a 30ns minimum on-time allows high step-down ratios even at high switching frequencies. The LT8643S-2 has external compensation to enable current sharing and fast transient response at high switching frequencies.
Burst Mode operation enables ultralow 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.
APPLICATIONS
- Automotive and Industrial Supplies
- General Purpose Step-Down
Documentation
Data Sheet 1
Brochure 1
Book & eBook 1
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 |
|---|---|---|---|
| LT8643SEV-2#PBF | 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) | ||
| LT8643SEV-2#TRPBF | 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) | ||
| LT8643SHV-2#PBF | 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) | ||
| LT8643SHV-2#TRPBF | 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) | ||
| LT8643SHV-2#WPBF | 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) | ||
| LT8643SHV-2#WTRPBF | 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) | ||
| LT8643SIV-2#PBF | 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) | ||
| LT8643SIV-2#TRPBF | 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) | ||
| LT8643SIV-2#WPBF | 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) | ||
| LT8643SIV-2#WTRPBF | 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Sep 15, 2023 - 23_0182 Notification of Qualification of Pillar Size Update for LT3977, LT3978, LT8636, LT8637, LT8640S, LT8640S-2, LT8643S, LT8643S-2 |
||
| LT8643SEV-2#PBF | PRODUCTION | |
| LT8643SEV-2#TRPBF | PRODUCTION | |
| LT8643SHV-2#PBF | PRODUCTION | |
| LT8643SHV-2#TRPBF | PRODUCTION | |
| LT8643SHV-2#WPBF | PRODUCTION | |
| LT8643SHV-2#WTRPBF | PRODUCTION | |
| LT8643SIV-2#PBF | PRODUCTION | |
| LT8643SIV-2#TRPBF | PRODUCTION | |
| LT8643SIV-2#WPBF | PRODUCTION | |
| LT8643SIV-2#WTRPBF | PRODUCTION | |
|
Apr 11, 2019 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process |
||
| LT8643SEV-2#PBF | PRODUCTION | |
| LT8643SHV-2#PBF | PRODUCTION | |
| LT8643SIV-2#PBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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LTspice
Models for the following parts are available in LTspice:
- LT8643S-2
- LT8643SA
LTpowerCAD
Design tools for the following parts are available in LTpowerCAD:
- LT8643SA
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.
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