LT80602/LT80603: 3V to 65V, 2.5A/3.5A/4.5A Synchronous Step-Down Silent Switcher with 8μA Quiescent Current

LT80602/LT8060309 Nov 2026

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The LT8060x and LT8060xHV step-down regulator family feature the Silent Switcher® architecture to minimize electromagnetic interference (EMI) emissions while delivering high efficiency at frequencies up to 3MHz.

The LT80602 and LT80602HV deliver up to 2.5A continuous current, the LT80603 and LT80603HV support up to 3.5A, and the LT80603A and LT80603AHV provide up to 4.5A continuous current. An ultralow 8µA quiescent current, with the output in full regulation, enables applications requiring the highest efficiency at light loads. An accurate enable threshold can be set using the EN/UV pin and a resistor at the RT pin to program the switch frequency.

The LT8060x and LT8060xHV enable high-V_IN to low-V_OUT conversion at high frequency, featuring a production-tested fast minimum top-switch on-time of 25ns (typ). In addition, the device features a PG/T_J pin that can be used to monitor the status of the output voltage or the die temperature. The die temperature monitor allows for direct measurement of the silicon die temperature, enabling a robust and reliable power supply design.

Key Features and Benefits

Silent Switcher® Architecture
- Ultralow EMI Emissions
- Spread Spectrum Frequency Modulation
Continuous output current
- LT80602: 2.5A
- LT80603: 3.5A
High Efficiency at High Frequency
- Up to 94.3% at 400kHz, 90% at 2.1MHz, 24VIN to 5VOUT
Up to 95.6% at 400kHz, 91.1% at 2.1MHz, 48VIN to 12VOUT
Pin Selectable Fixed 3.3V, Fixed 5V, or Adjustable Output from 0.8V to 99% of VIN
Low Quiescent Current Burst Mode Operation, 8μA IQ Regulating 24VIN to 5VOUT
On-the-Fly Mode Change Among Burst Mode, Pulse Skipping Mode, and FCM
Built-in Output-Voltage Monitoring and Die Temperature Monitoring with PG/TJ
200kHz to 3MHz Adjustable Switching Frequency with External Clock Synchronization
80V Transient-Input Tolerant (LT8060xHV)
Programmable Soft-Start and Tracking
Small 17-Lead 3mm × 3mm Quad Flat No-lead (QFN)