LT8636

RECOMMENDED FOR NEW DESIGNS

42V, 5A/7A Peak Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Analog Devices LT8636 Product Info

10 February 2026 6

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
5A Maximum Continuous, 7A Peak Transient Output
Ultralow Quiescent Current Burst Mode^® Operation

2.5µA I_Q Regulating 12V_IN to 3.3V_OUT
Output Ripple < 10mV_P-P

Fast Minimum Switch On-Time: 30ns
External Compensation: Fast Transient Response and Current Sharing (LT8637)
Low Dropout Under All Conditions: 100mV at 1A
Forced Continuous Mode
Adjustable and Synchronizable: 200kHz to 3MHz
Output Soft-Start and Power Good
Small 20-Lead 4mm × 3mm LQFN Package
AEC-Q100 Qualified for Automotive Applications

Part details & applications

The LT8636/LT8637 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 LT8636’s ultralow 2.5µA quiescent current—with the output in full regulation—enables applications requiring highest efficiency at very small load currents. The LT8637 has external compensation to enable current sharing and fast transient response at high switching frequencies. A CLKOUT pin enables synchronizing other regulators to the LT8636/LT8637.

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. Soft-start and tracking functionality is accessed via the TR/SS pin, and an accurate input voltage UVLO threshold can be set using the EN/UV pin.

Applications

Automotive and Industrial Supplies
General Purpose Step-Down

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