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LT8646S Datasheet

LT8646S Datasheet

65V, 8A Synchronous Step-Down Silent Switcher 2 with 2.5μA Quiescent Current
Part No.: LT8646S
Page: 30 Pages
Size: 3792 KB
Manufacturer: Linear Technology
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Views: 1
Update Time: 2023-11-09 16:43:48
DataSheet: Download

LT8646S Datasheet Applicable Part

Part No. Packing SPQ Marking MSL Pins Temp Range Package Description Buy
LT8646SEV#PBF Tray 490 8646SV 3 32 -40°C ~ 125°C 32-Lead LQFN (6mm x 4mm x 0.94mm)  
LT8646SEV#TRPBF Reel 2500 8646SV 3 32 -40°C ~ 125°C 32-Lead LQFN (6mm x 4mm x 0.94mm)  
LT8646SEV#TRMPBF Reel 500 8646SV 3 32 -40°C ~ 125°C 32-Lead LQFN (6mm x 4mm x 0.94mm)  
LT8646SIV#PBF Tray 490 8646SV 3 32 -40°C ~ 125°C 32-Lead LQFN (6mm x 4mm x 0.94mm)  
LT8646SIV#TRPBF Reel 2500 8646SV 3 32 -40°C ~ 125°C 32-Lead LQFN (6mm x 4mm x 0.94mm)  
LT8646SIV#TRMPBF Reel 500 8646SV 3 32 -40°C ~ 125°C 32-Lead LQFN (6mm x 4mm x 0.94mm)  
LT8646SEV#WPBF Tray 490 8646SV 3 32 -40°C ~ 125°C 32-Lead LQFN (6mm x 4mm x 0.94mm)  
LT8646SEV#WTRPBF Reel 2500 8646SV 3 32 -40°C ~ 125°C 32-Lead LQFN (6mm x 4mm x 0.94mm)  
LT8646SEV#WTRMPBF Reel 500 8646SV 3 32 -40°C ~ 125°C 32-Lead LQFN (6mm x 4mm x 0.94mm)  
LT8646SIV#WPBF Tray 490 8646SV 3 32 -40°C ~ 125°C 32-Lead LQFN (6mm x 4mm x 0.94mm)  
LT8646SIV#WTRPBF Reel 2500 8646SV 3 32 -40°C ~ 125°C 32-Lead LQFN (6mm x 4mm x 0.94mm)  
LT8646SIV#WTRMPBF Reel 500 8646SV 3 32 -40°C ~ 125°C 32-Lead LQFN (6mm x 4mm x 0.94mm)  
SPQ:Standard Pack Quantity;MSL:Moisture Sensitivity Level

LT8646S Datasheet(PDF)

LT8646S Datasheet(Picture)

LT8646S Features

  • 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 95% Efficiency at 1MHz, 12VIN to 5VOUT
    • Up to 94% Efficiency at 2MHz, 12VIN to 5VOUT
  • Wide Input Voltage Range: 3.4V to 65V
  • Ultralow Quiescent Current Burst Mode Operation
    • Output Ripple < 10mVP-P
  • External Compensation: Fast Transient Response and Current Sharing (LT8646S)
  • Fast Minimum Switch On-Time: 40ns
  • Low Dropout Under All Conditions: 60mV at 1A
  • Adjustable and Synchronizable: 200kHz to 2.2MHz
  • Peak Current Mode Operation
  • Output Soft-Start and Tracking
  • Small 32-Lead 6mm × 4mm LQFN Package
  • AEC-Q100 Qualified for Automotive Applications

LT8646S Applications

  • Automotive and Industrial Supplies
  • General Purpose Step-Down
  • GSM Power Supplies

LT8646S Description

The LT8646S 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 40ns minimum on-time allows high step-down ratios even at high switching frequencies. The LT8646S has external compensation to enable current sharing and fast transient response at high switching frequencies.

Burst Mode® operation enables ultralow standby current consumption, pulse-skipping mode allows full switching frequency at lower output loads, or spread spectrum operation can further reduce EMI emissions.

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