LT1245IS8#TRPBF

Overview

The LT1245IS8#TRPBF is a high-speed, fixed-frequency current mode pulse width modulator manufactured by Analog Devices Inc. It serves as an improved plug-compatible replacement for the industry standard UC1842 series. The device operates within a supply voltage range of 3V to 30V and features a built-in 5V reference. Designed for surface mount applications in an 8-SOIC package, it supports switching frequencies up to 300kHz. Key electrical characteristics include a 1A peak output drive capability and a 500ns minimum on-time, ensuring efficient performance in DC-DC converter topologies.

Feature Summary

• Implements fixed-frequency current mode control architecture for stable regulation
• Provides enhanced compatibility with legacy UC1842 series designs
• Integrates a precision 5V internal reference source
• Features high peak output drive capability for robust gate driving

Applications

• Buck regulator step-down DC-DC converters
• Isolation-capable output power supplies
• General-purpose PWM controller circuits

Procurement Notes

Verify the specific suffix designation against official Analog Devices documentation to confirm tape and reel packaging requirements. Ensure that the ordering suffix corresponds exactly to the requested quantity format. Cross-reference the manufacturer part number with authorized distributor catalogs to confirm availability status and lead time constraints prior to finalizing procurement orders.

Selection Notes

Select this component when a direct upgrade or drop-in replacement for UC1842-based designs is required. It is suitable for applications demanding high-speed current mode operation with fixed frequency control. Consider the 8-SOIC package constraint and the 300kHz maximum switching frequency limit when designing the power stage. Verify input voltage ranges align with the 3V to 30V operational specification.

Part Context

This part belongs to the LT124x family of high-speed current mode pulse width modulators from Analog Devices. These devices are engineered to provide reliable performance in switching power supply applications. The IS8 variant specifically denotes the industrial temperature range and SOIC package configuration, distinguishing it from other thermal or package options within the broader product line.

Replacement Considerations

LT1245IS8#PBF

FAQ

What is the primary architectural difference between the LT1245 and traditional voltage mode controllers?

The LT1245 utilizes a fixed-frequency current mode control architecture, which offers faster transient response and inherent cycle-by-cycle current limiting compared to voltage mode approaches.

Does the LT1245 support isolation capabilities in its output configuration?

Yes, the device is designed to support isolation-capable output configurations, making it suitable for various isolated DC-DC converter topologies.