LT8650S
Info : RECOMMENDED FOR NEW DESIGNS
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LT8650S

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

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 15
1ku List Price Starting From $6.77
Features
  • 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
  • Forced Continuous Mode
  • Optional External VC Pin: Fast Transient Response and Current Sharing (Extra 50µA IQ/Channel)
  • 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
Commercial Space Features
  • Wafer diffusion lot traceability
  • Radiation benchmark
  • Total ionizing dose (TID): 30 krads
  • Single event latchup (SEL): ≤ 40.8 MeV-cm2/mg
Additional Details
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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
Part Models 15
1ku List Price Starting From $6.77

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Documentation

Documentation

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Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

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Aug 28, 2023

- 23_0172

Qualification of an Additional Substrate Supplier, SMT Attach Material and Pillar Size Change for LT8650S

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May 4, 2020

- 19_0263

LT8650S Component, Substrate Layout and Datasheet Specification Change

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Apr 11, 2019

- 19_0067

Notification of Wafer Fab Location Change for 0.35 BCD Process

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Aug 28, 2023

- 23_0172

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Qualification of an Additional Substrate Supplier, SMT Attach Material and Pillar Size Change for LT8650S

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May 4, 2020

- 19_0263

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LT8650S Component, Substrate Layout and Datasheet Specification Change

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Apr 11, 2019

- 19_0067

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Notification of Wafer Fab Location Change for 0.35 BCD Process

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC2407A

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

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DC2407A

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

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

Product Detail

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.

Tools & Simulations

Tools & Simulations 2

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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