LT8640S-2

RECOMMENDED FOR NEW DESIGNS

42V, 6A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Analog Devices LT8640S-2 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 5V_OUT
- Up to 95% Efficiency at 2MHz, 12V_IN to 5V_OUT
Wide Input Voltage Range: 3.4V to 42V
6A Maximum Continuous, 7A Peak Output
External Compensation: Fast Transient Response and Current Sharing (LT8643S-2)
Fast Minimum Switch On-Time: 30ns

Ultralow Quiescent Current Burst Mode^® Operation
- 2.5μA I_Q Regulating 12V_IN to 3.3V_OUT (LT8640S-2)
- Output Ripple < 10mV_P-P
Low Dropout Under All Conditions: 100mV at 1A
Forced Continuous Mode
Adjustable and Synchronizable: 200kHz to 3MHz
Output Soft-Start and Tracking
Small 24-Lead 4mm × 4mm LQFN Package
AEC-Q100 Qualified for Automotive Applications

Part details & applications

The LT8640S-2/LT8643S-2 synchronous step-down regulator features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. Peak current mode control with a 30ns minimum on-time allows high step-down ratios even at high switching frequencies. The LT8643S-2 has external compensation to enable current sharing and fast transient response at high switching frequencies.

Burst Mode operation enables ultralow 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.

APPLICATIONS

Automotive and Industrial Supplies
General Purpose Step-Down

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