LT1533CS#PBF

Overview

The LT1533CS#PBF is a switching regulator controller from Analog Devices, housed in a 16-lead narrow SO package. It operates within an input voltage range of 2.7V to 23V and features two integrated 1A current-limited power switches. The device supports adjustable output voltages for both positive and negative rails, with an oscillator frequency range of 20kHz to 250kHz that can be synchronized to an external clock. Standby current is typically 12μA.

Feature Summary

• Ultra-low noise architecture designed to minimize conducted and radiated electromagnetic interference through user-controllable voltage and current slew rates.
• Dual-output switch current mode topology with independent control over switching transition speeds to optimize harmonic components versus efficiency.
• Integrated protection mechanisms including per-cycle current limiting, undervoltage lockout, and thermal shutdown.

Applications

• Precision instrumentation systems
• Isolated power supplies for industrial automation
• Medical instruments
• Wireless communication equipment
• Single-board data acquisition systems

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance when sourcing. Confirm the 16-lead narrow SO physical package dimensions match your PCB footprint requirements. Ensure the 2.7V minimum input voltage aligns with your system's supply rails. Check for availability constraints as distribution status may vary by region.

Selection Notes

Select this component when low EMI is critical, as it allows independent adjustment of voltage and current slew rates to reduce high-frequency harmonics significantly. It is suitable for portable applications due to low standby current. Consider the dual 1A switches for moderate load requirements without external transistors.

Part Context

This part belongs to the LT1533 family of ultra-low noise bipolar output switching regulators. It differs from standard PWM controllers by offering built-in slew rate control to suppress EMI. The CS#PBF designation specifies the commercial temperature range and plastic packaging variant within the broader LT1533 product line.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Verify compatibility if considering alternatives based on pinout and electrical specifications.

FAQ

How does the LT1533 reduce electromagnetic interference?

It reduces EMI by providing user-controllable voltage and current conversion rates, allowing optimization of switching harmonics while maintaining efficiency.

Can the LT1533 generate negative output voltages?

Yes, the unique error amplifier circuit enables regulation of both positive and negative output voltages.