LT8646S

RECOMMENDED FOR NEW DESIGNS

65V, 8A Synchronous Step-Down Silent Switcher 2 with 2.5μA Quiescent Current

Data Sheet (Rev. E) Product Selection Table
Part Models
8
1ku List Price
Starting From $7.01
Viewing:

Part Details

  • 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
    • 2.5μA IQ Regulating 12VIN to 3.3VOUT (LT8645S)
    • 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
65V, 8A Synchronous Step-Down Silent Switcher 2 with 2.5μA Quiescent Current
5V 8A Step-Down Converter Product Package 1 12VIN to 5VOUT Efficiency LT8645S-LT8646S Block Diagram
Add to myAnalog

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project
Ask a Question

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Learn More
Add to myAnalog

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project

Hardware Ecosystem

Parts Product Life Cycle Description
High Voltage Hot Swap Controllers 1
LTC4380
RECOMMENDED FOR NEW DESIGNS Low Quiescent Current Surge Stopper
Low Voltage Hot Swap Controllers 1
LTC4231
RECOMMENDED FOR NEW DESIGNS Micropower Hot Swap Controller
Modal heading
Add to myAnalog

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project

Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT8646S

LTpowerCAD 1

LTspice

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

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

eval board
schematic 1
schematic 2
schematic 3
schematic 4
DC2660A

LT8646S Demo Board | 65V, 8A Synchronous Step-Down Silent Switcher 2

Buy Now View Details

Product Details

Demonstration circuit 2660A is a 65V, 8A synchronous step-down second generation Silent Switcher® with spread spectrum frequency modulation featuring the LT8646S. The demo board is designed for 5V output from a 5.6V to 65V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8646S is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. The integrated bypass capacitors optimize all the fast current loops and make it easier to minimize EMI/EMC emissions by reducing layout sensitivity. Selectable spread spectrum mode can further improve EMI/EMC performance. Fast minimum on-time of 40ns enables high VIN to low VOUT conversion at high frequency.
DC2660A
LT8646S Demo Board | 65V, 8A Synchronous Step-Down Silent Switcher 2
DC2660A Evaluation Board DC2660A Evaluation Board - Top View DC2660A Evaluation Board - Bottom View DC2660A

Latest Discussions

33 Weeks Ago
RE: Parallelling more than two LT8646S devices
2 Years Ago
RE: Paralleling LT8646s with CC circuit
View related discussion on EngineerZone®

Recently Viewed