LT8615

RECOMMENDED FOR NEW DESIGNS

42V, 3.5A Synchronous Step-down Regulator with 2.5μA Quiescent Current

Analog Devices LT8615 Product Info

10 February 2026 6

Features

Wide Input Voltage Range: 3V to 42V
Wide Output Voltage Range: 0.787V to (V_IN – 0.4V)
Ultralow Quiescent Current Burst Mode^®
Operation:
- <2.5μA I_Q Regulating 12V_IN to 3.3V_OUT
- Output Ripple <10mV_P-P
Silent Switcher^® Powertrain for Ultralow EMI Emissions
High Efficiency 2MHz Synchronous Operation:
- Up to 93% Efficiency at 2MHz, 12V_IN to 5V_OUT
Fast Minimum Switch-On Time: 40ns
Very Low Dropout: 125mV at 1A

Adjustable and Synchronizable: 400kHz to 2.5MHz
Optional Spread-Spectrum Frequency Modulation
Fixed Frequency Peak Current-Mode Operation
Accurate 1V Enable Pin Threshold
Output Soft-Start and Tracking
Small 3mm × 3mm Side Wettable QFN Package
- Clearance Between High Voltage and Low Voltage Pins
- Excellent Solder Joint Reliability
AEC-Q100 Qualified for Automotive Applications
Temperature Grade 0: −40°C to +150°C, T_A

Part details & applications

The LT8615 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that can deliver 3.5A of continuous current. The LT8615’s ultralow 2.5μA quiescent current in Burst Mode operation (with the output in full regulation) enables high efficiency down to very low load currents while keeping the output ripple below 10mV_P-P.

A SYNC pin allows synchronization to an external clock or spread-spectrum modulation for low EMI operation. Internal compensation with peak current-mode topology allows the use of small inductors and results in fast transient response and good loop stability. The EN/UV pin has an accurate 1V threshold and can be used to program V_IN UVLO or to shut down the part. A capacitor on the TR/SS pin programs the output voltage ramp rate during start-up. An open-drain PG pin flag signals when the output is within ±8% as well as fault conditions.

APPLICATIONS

Automotive and Industrial Supplies
Low EMI Step-Down

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