LT1317BCMS8#TRPBF

Overview

The LT1317BCMS8#TRPBF is a micropower, fixed-frequency step-up DC/DC converter manufactured by Analog Devices Inc. It operates over a wide input voltage range of 1.5V to 12V and provides an adjustable output voltage from 1.24V to 30V with a maximum output current of 0.2A. The device utilizes an 8-pin MSOP package and features a switching frequency of 600kHz. It maintains high efficiency across a broad load range of 300uA to 200mA. Unlike the standard LT1317, the LT1317B variant does not shift into Burst Mode operation at light loads, which eliminates low-frequency output ripple at the expense of light-load efficiency.

Feature Summary

• Fixed-frequency boost topology for consistent noise profiles
• Wide input voltage compatibility for single or multi-cell battery sources
• Adjustable output voltage capability via external feedback network
• Elimination of low-frequency output ripple through continuous conduction mode

Applications

• Single lithium-ion cell to regulated voltage conversion
• Two-cell battery-powered systems requiring stable DC output
• Portable devices needing low-noise power supply regulation
• General-purpose step-up applications in industrial instrumentation

Procurement Notes

Verify that the specific suffix #TRPBF indicates tape-and-reel packaging rather than tube packaging, as this affects handling and storage requirements during assembly. Confirm that the BC grade meets the required commercial temperature operating range of 0°C to +70°C for your specific application environment. Ensure that the absence of Burst Mode operation aligns with your system's electromagnetic interference (EMI) constraints, as this design choice prioritizes ripple reduction over light-load efficiency optimization.

Selection Notes

Select the LT1317BCMS8#TRPBF when low output ripple is critical, as the LT1317B variant avoids the burst-mode switching inherent in the standard LT1317. This part is suitable for applications where light-load efficiency is less important than signal integrity. Consider the 0.2A current limit and 600kHz switching frequency when designing passive components. The MSOP-8 package offers a compact footprint for space-constrained designs. Verify that the input voltage range covers your minimum source voltage under all operating conditions.

Part Context

This component belongs to the LT1317 family of micropower switching regulators from Analog Devices. The LT1317 series is designed for battery-powered applications requiring efficient step-up conversion. The LT1317B sub-family specifically modifies the control loop to prevent burst-mode entry, distinguishing it from the standard LT1317 which uses Burst Mode for ultra-low quiescent current. The MSOP-8 package is common across the series, facilitating board layout consistency while offering different electrical characteristics based on the suffix.

Replacement Considerations

LT1317BCMS8#PBF: Identical electrical specifications but supplied in tube packaging instead of tape-and-reel. LT1317CMS8#PBF: Standard LT1317 function including Burst Mode operation; not electrically equivalent regarding ripple performance.