SG3524BDW

Overview

The SG3524BDW is a pulse width modulation controller designed for switching regulators, inverters, and DC-to-DC converters. It integrates an on-chip reference, error amplifier, programmable oscillator, pulse-steering flip-flop, and output transistors. Key electrical parameters include a 7V to 40V operating voltage range, a 5V reference trimmed to ±1%, and an oscillator frequency range of 100Hz to 400KHz. The device features dual 100mA output transistors with 60V collectors, operates within a 0°C to 70°C temperature range, and utilizes a 16-pin SOIC package.

Feature Summary

• Integrates complete PWM power control circuitry including error amplifier, oscillator, and shutdown logic
• Supports single-ended or push-pull applications via dual alternating outputs
• Features undervoltage lockout and full double-pulse suppression for stable operation
• Provides high-gain comparator and current-limiting circuitry for protection

Applications

• Transformer-coupled DC-to-DC converters
• High-power-output switching regulators
• Transformerless voltage doublers
• Polarity converter applications

Procurement Notes

Verify the specific manufacturer source, as the SG3524 family has been produced by multiple entities including Microsemi and Microchip Technology. Confirm that the SG3524BDW designation aligns with the required pinout and electrical specifications for your design. Check availability status carefully, as some listings indicate this part may be obsolete or discontinued depending on the supplier's inventory. Ensure the package type matches the 16-SOIC requirement for your PCB layout.

Selection Notes

Select this component when designing fixed-frequency PWM systems requiring integrated protection features like undervoltage lockout and current limiting. The wide input voltage range and dual output capability make it suitable for both single-ended and push-pull topologies. Consider the 400KHz maximum frequency limit when determining switching speed requirements. Verify thermal performance within the specified 0°C to 70°C commercial temperature range for industrial applications.

Part Context

The SG3524 is part of a legacy family of regulating pulse width modulators originally developed for robust power supply control. It serves as a direct replacement for earlier industry standards like the SG1524, offering improved reference accuracy and extended common-mode range. The BDW suffix typically denotes a specific package variant (SOIC) and temperature grade within the broader SG3524 product line, ensuring compatibility with standard surface-mount assembly processes.

Replacement Considerations

The SG1524B is documented as a direct pin-for-pin replacement for earlier devices in this family, offering improved performance. The LT1524 is also listed as a similar regulating pulse width modulator. Verify pin compatibility and electrical parameter alignment before substituting.