LT80605

RECOMMENDED FOR NEW DESIGNS

3V to 65V, 5.5A Synchronous Step-Down Silent Switcher with 9μA Quiescent Current

Analog Devices LT80605 Product Info

10 February 2026 7

Features

Silent Switcher® Architecture, Ultralow EMI Emissions
High Efficiency at High Frequency

Up to 94.5% at 400kHz, 24V_IN to 5V_OUT
Up to 93% at 1MHz, 24V_IN to 5V_OUT

Pin Selectable Adjustable, Fixed 3.3V and 5V Output
Ultralow Quiescent Current Burst Mode Operation

9μA IQ Regulating 24V_IN to 5V_OUT

On-the-Fly Mode Change Among Burst, Pulse Skip and Forced Continuous Mode
Burst and Pulse Skipping Modes to Enable Enhanced Light-Load Efficiency

Built-in Output-Voltage Monitoring and Die Temperature Monitoring with PG/T_J
99% Duty-Cycle Operation
200kHz to 3MHz Adjustable Switching Frequency with External Clock Synchronization
70V Transient-Input Tolerant
Internal Compensation
Programmable Soft-Start and Tracking
Built-in Hiccup Mode Overload Protection;
Safely Tolerates Inductor Saturation in Overload
Small 17-Lead 3mm × 4mm QFN

Part details & applications

The LT80605 step-down regulator features the Silent Switcher^® architecture to minimize EMI emissions while delivering high efficiency at frequencies up to 3MHz. Assembled in a 3mm x 4mm QFN, the monolithic construction with integrated power switches and inclusion of all necessary circuitry yields a solution with a minimal PCB footprint. An ultralow 9μA quiescent current with the output in full regulation enables applications requiring highest efficiency at light loads. The device features a SYNC/MODE pin that selects among Burst Mode, pulse skipping, or forced continuous mode (FCM), and also allows synchronization to an external clock. Soft-start and tracking functionality are accessed through the TR/SS pin. An accurate enable threshold can be set using the EN/UV pin and a resistor at the RT pin programs switch frequency. In addition, the device features a PG/TJ pin that can be used either to monitor the status of output voltage or die temperature. The die temperature monitor allows to directly measure the silicon die temperature, enabling a robust, reliable power supply design.

APPLICATIONS

General Purpose Step-Down
Automotive and Industrial Supplies

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