LT1170IT#PBF

Overview

The LT1170IT#PBF is a monolithic high-power switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 3 V to 40 V and delivers a maximum output current of 5 A, supporting up to 100 W of output power. The device features a fixed 100 kHz switching frequency and adjustable output voltage starting from 1.244 V. It supports multiple topologies including buck, boost, flyback, forward, inverting, and Cuk configurations. The component is housed in a TO-220-5 package and functions within a junction temperature range of -40°C to 100°C.

Feature Summary

• Supports all standard switching configurations including buck, boost, flyback, forward, inverting, and Cuk topologies
• Integrates a high-current, high-efficiency switch with complete oscillator, control, and protection circuitry on the die
• Provides adjustable output voltage capability for versatile power supply designs

Applications

• High efficiency constant current charging systems
• Positive or negative step-up and step-down converters
• Flyback and forward converter implementations
• Driving high voltage NPN transistors

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance when sourcing. Confirm the TO-220-5 through-hole package requirement matches your PCB layout. Ensure the 40 V maximum input voltage rating suits your system's peak supply conditions. Check that the 5 A switch current limit aligns with your load requirements without exceeding thermal limits.

Selection Notes

Select this component for applications requiring flexible topology support beyond simple buck or boost circuits. The integrated high-current switch simplifies design by reducing external component count. Consider the TO-220-5 package for adequate heat dissipation in high-power scenarios. Verify that the 100 kHz frequency meets your electromagnetic interference constraints and inductor size preferences.

Part Context

The LT1170 series comprises monolithic high-power switching regulators designed for versatile DC-DC conversion. The IT variant specifically denotes the through-hole TO-220-5 package option. This family allows operation in various standard switching modes, making it suitable for complex power management tasks where a single controller must handle multiple conversion types efficiently.

Replacement Considerations

LT1170IQ#PBF serves as a surface-mount alternative using the DDPAK-5 package while maintaining identical electrical specifications and functionality.