LT8608EMSE

Overview

The LT8608EMSE is a compact, high-efficiency synchronous monolithic step-down switching regulator manufactured by Analog Devices. It operates with an input voltage range of 3V to 42V and delivers a continuous output current of 1.5A. The device features adjustable output voltage starting from 0.778V. It consumes only 1.7µA of quiescent current in Burst Mode operation, maintaining low ripple below 10mV at very low output currents. The switching frequency is programmable between 200kHz and 2.2MHz. It utilizes peak current mode topology with internal compensation for fast transient response. The component is housed in a 10-lead MSOP package with an exposed pad and supports operating temperatures from -40°C to +125°C.

Feature Summary

• Low quiescent current consumption of 1.7µA enables high efficiency down to very low output currents while keeping output ripple below 10mV.
• Internal compensation with peak current mode topology allows the use of small inductors and ensures fast transient response with good loop stability.
• The EN/UV pin provides an accurate 1V threshold for programming input undervoltage lockout or shutting down the regulator.
• The PG flag signals when the output voltage is within ±8.5% of the programmed level and indicates fault conditions.

Applications

• Portable instrumentation systems requiring low standby power
• Battery-powered equipment needing extended runtime
• Industrial control systems with wide input voltage ranges
• Automotive electronics operating under varying line conditions

Procurement Notes

Verify the specific suffix and tape/reel configuration against the manufacturer's official documentation before ordering. Confirm that the requested package variant matches the design requirements for thermal performance and footprint compatibility. Ensure that the component version aligns with the intended application voltage and current specifications. Cross-reference the datasheet revision to confirm feature availability and electrical characteristics.

Selection Notes

Select this regulator for applications requiring a wide input voltage range up to 42V with moderate output current capabilities. The internal compensation simplifies external component selection, reducing board space usage. Consider the programmable switching frequency to optimize the trade-off between efficiency and passive component size. Evaluate the thermal performance requirements based on the MSOP package limitations and expected load conditions.

Part Context

The LT8608 belongs to the LT8608 family of synchronous step-down regulators designed for high efficiency and low noise. It is part of Analog Devices' portfolio of power management integrated circuits aimed at portable and industrial applications. The device complements other members of the series offering different current ratings and input voltage capabilities.

Replacement Considerations

LT8608IMSE#PBF

FAQ

How does the LT8608 maintain low output ripple?

It uses low ripple Burst Mode operation which maintains high efficiency down to very low output currents while keeping the output ripple below 10mV.

What is the function of the EN/UV pin?

The EN/UV pin has an accurate 1V threshold and can be used to program the input undervoltage lockout or to shut down the LT8608.