LT8686S

RECOMMENDED FOR NEW DESIGNS

42V Quad, Gangable, Synchronous, Monolithic Step-Down Regulator

Analog Devices LT8686S Product Info

10 February 2026 5

Features

Silent Switcher^®2 Architecture
- Ultralow EMI Emissions
- Optional Spread Spectrum Modulation
Two High Voltage Synchronous Buck Regulators
- 3V to 42V Input Voltage Range
- Output Currents Up to 2A per Channel
- Channels May Be Connected in Parallel Using a Single Inductor
Two Low Voltage Synchronous Buck Regulators
- 3V to 8V Input Voltage Range
- Output Currents up to 2A per Channel
- Channels May Be Connected in Parallel Using a Single Inductor

12μA I_Q All Channels Active and No-Load
Flexible Supply Sequencing and Control
Adjustable and Synchronizable: 350kHz to 3MHz
Available in 32-Pin LQFN (5mm × 5mm)
AEC-Q100 Qualified for Automotive Applications

Part details & applications

The LT8686S is a highly flexible, four-channel, current mode, monolithic regulator able to power a wide range of automotive and industrial applications while occupying minimal board space.

The LT8686S combines two 42V capable 2A buck regulators with two 8V capable 2A buck regulators. The two 42V regulators may be combined to provide up to 4A of output current using a single inductor. Similarly, the two 8V regulators may be combined to provide up to 4A of output current using a single inductor. Individual channel enable, track/soft-start and power good pins provide flexible power supply sequencing and control. The LT8686S features a Silent Switcher 2 architecture, plus selectable spread spectrum mode, to provide ultralow EMI/EMC emissions while delivering high efficiency at high switching frequencies.

The LT8686S incorporates thermal shutdown and individual channel cycle-by-cycle current limit for short-circuit protection and robust operation.

APPLICATIONS

Automotive Systems
Industrial Controls and Power Supplies

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