Components

65Vin, 5Vout / 8A Synchronous Step-Down Regulator with 2.5µA IQ

The LT®8645S-2 synchronous step-down regulator from Analog Devices features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. This performance makes the LT8645S-2 well-suited for noise sensitive applications and environments.

Anticipated applications include automotive and industrial power supplies, general-purpose step-down regulation and GSM power supplies.

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.

Burst Mode® operation enables ultralow standby current consumption (2.5µA quiescent current), pulse-skipping mode allows full switching frequency at lower output loads, or spread spectrum operation can further reduce EMI emissions.

Summary of features:

  • Silent Switcher® Architecture
    • Ultralow EMI Emissions
    • 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
    • 5µA IQ Regulating 12VIN to 3.3VOUT
    • Output Ripple < 10mVP-P
  • 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 Qualification in Progress
Analog Devices Inc.
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