LT8638SJV#PBF

Overview

The LT8638SJV#PBF is a synchronous buck Silent Switcher 2 regulator from Analog Devices, housed in a 28-lead LQFN package. It supports an input voltage range of 2.8 V to 42 V and delivers up to 10 A output current with a single adjustable output starting at 0.6 V. The device operates with a switchable frequency between 200 kHz and 3 MHz and features a typical quiescent current of 9 uA. It functions within a junction temperature range of -40°C to +150°C.

Feature Summary

• Integrates Silent Switcher 2 architecture to minimize electromagnetic interference radiation without requiring external shielding or complex layout techniques.
• Features peak current mode control with a minimum on-time of 25 ns to maintain high efficiency during deep step-down conversions.
• Includes internal bypass capacitors to optimize fast current loops and reduce sensitivity to printed circuit board layout dimensions.

Applications

• Industrial systems requiring low noise power supplies for sensitive analog circuits
• Automotive electronics operating within wide input voltage ranges
• Telecommunications infrastructure equipment
• Medical devices with strict electromagnetic compatibility requirements

Procurement Notes

Verify the specific suffix against official documentation to confirm package type and reel configuration. Confirm RoHS compliance status and moisture sensitivity level prior to assembly planning. Ensure the ordering part number matches the required thermal pad exposure and lead finish specifications defined in the manufacturer datasheet.

Selection Notes

Select this component when high efficiency is required across a wide input voltage range while maintaining strict EMI limits. The adjustable switching frequency allows optimization for either size or efficiency. External compensation via the V0 pin enables tailored transient response and parallel operation for higher current demands.

Part Context

This part belongs to the LT8638 series of Silent Switcher regulators designed for applications demanding low radiated emissions. It utilizes advanced capacitor technology to contain high di/dt currents internally. The family targets designs where standard switching regulators would fail electromagnetic testing without significant cost or size penalties.

FAQ

Does the #PBF suffix indicate a change in electrical performance?

No, the #PBF suffix denotes Pb-free packaging and does not alter the electrical characteristics or functionality of the device.

How is the switching frequency adjusted?

The frequency is set externally using a resistor connected to the RT/CLKOUT pin, allowing selection between 200 kHz and 3 MHz.