Analog Devices Inc. LT8636x/LT8637x Synch Step-Down Regulators

Analog Devices Inc. LT8636x/LT8637x Synch Step-Down Regulators feature Silent Switcher® architecture designed to minimize electromagnetic interference (EMI) emissions. This allows the step-down regulators to deliver high efficiency at high switching frequencies. Output voltage on step-down regulators are lower than their input voltage. The Step-Down Regulators also feature peak current mode control with a 30ns minimum on-time allows high step-down ratios even at high switching frequencies. LT8636 also has an ultralow 2.5µA quiescent current. The LT8637has external compensation to enable current sharing and fast transient response at high switching frequencies. A CLKOUT pin enables synchronizing other regulators tothe LT8636/LT8637.


  • Silent Switcher® Architecture
    • Ultralow EMI emissions
    • Optional spread spectrum modulation
  • High efficiency at high frequency
    • Up to 96% efficiency at 1MHz, 12VIN to 5VOUT
    • Up to 95% efficiency at 2MHz, 12VIN to 5VOUT
  • 3.4V to 42V wide input voltage range
  • 5A maximum continuous, 7A peak output
  • 30ns fast minimum switch on-time
  • Ultralow quiescent current Burst Mode® operation
    • 2.5µA IQ regulating 12VIN to 3.3VOUT (LT8636)
    • Output ripple < 10mVP-P
    • External compensation of fast transient response and current sharing (LT8637)
  • 100mV at 1A low dropout under all conditions
  • Forced continuous mode
  • 200kHz to 3MHz adjustable and synchronizable
  • Output soft-start and tracking
  • Small 20-lead 4mm × 3mm LQFN package
  • AEC-Q100 qualification in progress

Block Diagram

Block Diagram - Analog Devices Inc. LT8636x/LT8637x Synch Step-Down Regulators
Published: 2019-09-06 | Updated: 2022-03-11