LT8650S

RECOMMENDED FOR NEW DESIGNS

Dual Channel 4A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2µA Quiescent Current

Data Sheet (Rev. D) Product Selection Table
Part Models
16
1ku List Price
Starting From $6.77
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Part Details

  • 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
LT8650S
Dual Channel 4A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2µA Quiescent Current
LT8650S Application Circuit LT8650S Performance Graph LT8650S Pin Configuration LT8650S Chip
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Documentation

Data Sheet 2

Reliability Data 1

Design Note 3

Technical Articles 2

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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
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Tools & Simulations

LTspice 2

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
DC2407A

LT8650S Demo Board | Dual Channel 42V, 4A Synchronous Step-Down Silent Switcher 2

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Product Details

Demonstration circuit 2407A is a dual channel 42V, 4A synchronous step-down Silent Switcher® with 6.2μA quiescent current featuring the LT8650S. The LT8650S is the second-generation Silent Switcher that minimizes EMI and reduces PCB layout sensitivity. The demonstration circuit has two outputs: 5V and 3.3V. Each output can source up to 4A continuous current at the same time. Figure 1 shows the conducted EMI measurements from 150kHz to 30MHz. Figure 2 shows the radiated EMI measurements from 30MHz to 1GHz. All measurements were tested per CISPR 25 specifications. The circuit passes the tests with wide margins.
DC2407A
LT8650S Demo Board | Dual Channel 42V, 4A Synchronous Step-Down Silent Switcher 2
DC2407A Evaluation Board DC2407A Evaluation Board - Top View DC2407A Evaluation Board - Bottom View DC2407A

Latest Discussions

1 Years Ago
RE: LT8653S : How high a voltage can VOUT be, based on the Feedback Resistor programming.
1 Years Ago
RE: LT8650 switching frequency - difference between LTPowerCAD II v2.7.2 and datasheet
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