FAN5236QSCX

Special Purpose Regulators Overview

The FAN5236QSCX is a dual synchronous switching PWM controller designed for mobile-friendly DDR and dual-output applications. It operates with a maximum switching frequency of 345 kHz and utilizes a PDSO28 package, specifically the TSSOP-28 form factor (MO-153-AB). The device provides high efficiency through synchronous rectification and hysteretic operation at light loads. Output voltages are adjustable from 0.9V to 5.5V, supporting I/O, chipsets, and memory banks in notebooks and PDAs. It features out-of-phase operation with 180-degree phase shift to reduce input current ripple.

Special Purpose Regulators Feature Summary

• Provides highly flexible dual synchronous switching PWM control with modes for standard dual-output and dedicated DDR memory power supply configurations.
• Enhances efficiency via MOSFET Rds(on) current sensing, feedforward ramp modulation, and average-current-mode control for fast load transient response.
• Supports DDR memory powering by enabling one channel to track another, providing necessary output current sink and source capabilities alongside buffered reference voltage.

Special Purpose Regulators Applications

• Powering I/O, chipsets, and memory banks in high-performance notebook computers
• Power supply solutions for Personal Digital Assistants (PDAs)
• DDR memory power supply modules requiring specific current sink/source capabilities

Special Purpose Regulators Procurement Notes

Verify that the suffix 'Q' indicates automotive or qualified grade specifications if required by your design, as standard datasheets may primarily describe the commercial FAN5236 variant. Confirm the SCX suffix corresponds to the correct tape-and-reel packaging configuration for automated assembly. Ensure compatibility with the TSSOP-28 footprint and verify thermal requirements for the intended operating environment against the official thermal resistance data.

Special Purpose Regulators Selection Notes

Select this component when designing power systems for mobile devices requiring dual independent outputs or synchronized DDR memory rails. The internal compensation and current-mode control simplify external component selection compared to voltage-mode controllers. Consider the 180-degree phase shift feature if minimizing input capacitor size and ripple current is a priority for the system's power integrity.

Special Purpose Regulators Part Context

The FAN5236 series is part of Fairchild's portfolio of mobile-friendly power management ICs, specifically targeting the demanding efficiency and space constraints of portable computing. The FAN5236MTC and FAN5236MX variants share similar core functionalities but differ in packaging and reel specifications. This controller bridges the gap between general-purpose DC/DC conversion and specialized memory power delivery.

Special Purpose Regulators Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult ON Semiconductor or Fairchild technical support for direct replacements or pin-compatible alternatives suitable for DDR and dual-output PWM applications.