LT8642-1

RECOMMENDED FOR NEW DESIGNS

18V, 10A Synchronous Step-Down Silent Switcher

Analog Devices LT8642-1 Product Info

10 February 2026 7

Features

Silent Switcher^® Architecture
- Ultralow EMI Emissions
- Optional Spread Spectrum Modulation
High Efficiency at High Frequency
- Up to 96% Efficiency at 1MHz, 12V_IN to 3.3V_OUT
- Up to 95% Efficiency at 2MHz, 12V_IN to 3.3V_OUT
Wide Input Voltage Range: 2.8V to 18V
10A Output Current
External Compensation: Fast Transient Response and Current Sharing

Low Quiescent Current Burst Mode® Operation
- 240μA I_Q Regulating 12V_IN to 1.2V_OUT
- Output Ripple: <10mV_P-P
Fast Minimum Switch On-Time: 20ns
Low Dropout Under All Conditions: 50mV at 1A
Forced Continuous Mode
Adjustable and Synchronizable: 200kHz to 3MHz
Output Soft-Start and Power Good
Small 20-Lead 3mm × 4mm LQFN Package

Part details & applications

The LT8642-1 synchronous step-down regulator features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. This performance makes the LT8642-1 ideal for noise sensitive applications and environments.

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 20ns minimum on-time allows high step-down ratios even at high switching frequencies. External compensation via the V_C pin allows for fast transient response at high switching frequencies. The V_C pin also enables current sharing and a CLKOUT pin enables synchronizing other regulators to the LT8642-1.

Burst Mode operation enables low standby current consumption, forced continuous mode can control frequency harmonics across the entire output load range, or spread spectrum operation can further reduce EMI emissions. Soft-start and tracking functionality is accessed via the SS pin, and an accurate input voltage UVLO threshold can be set using the EN/UV pin.

Applications

Server Power Applications
Automotive and Industrial Supplies
General Purpose Step-Down

	INTERNAL CAPACITORS	PACKAGE
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