FAN1539MPX

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The FAN1539MPX is a fixed-output low dropout regulator providing 3.3V at up to 1.0A output current. It features very low ground current of 1mA typical and excellent line/load regulation with transient overshoot under 10%. The device operates with input voltages from 4.5V to 7V and includes thermal shutdown and current limit protection. Stability is maintained using low ESR ceramic capacitors. It is housed in a thermally enhanced 3x3mm 6-lead MLP package suitable for portable applications.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Very low quiescent ground current for extended battery life
• Stable operation with low ESR ceramic output capacitors
• Integrated thermal shutdown and short-circuit current limit protection

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Disk drive circuits
• Desktop computers
• Laptop and notebook computers
• General purpose three-terminal regulator

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix 'MPX' corresponds to the 3x3mm 6-lead MLP package configuration. Confirm that the required output voltage matches the fixed 3.3V specification, as other variants exist for different voltages or packages. Ensure compatibility with low ESR capacitor requirements for stability.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when designing portable systems requiring high efficiency and low standby power consumption. Consider the 3x3mm footprint for space-constrained layouts. Evaluate thermal performance based on PCB copper area, as junction-to-ambient resistance varies significantly with board layout and heat dissipation capabilities.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the FAN1539/FAN1540 series of high-current LDOs developed for portable applications. While originally manufactured by Fairchild Semiconductor, the product line is now associated with onsemi following industry acquisitions. The series emphasizes low quiescent current and robust protection features for consumer electronics.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

FAN1540MPX (1.3A version, same package)

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

What type of output capacitors are required for stability?

The device is stable with low ESR ceramic capacitors, specifically down to 0mΩ ESR. X7R types such as 10µF output and 22µF input capacitors are recommended.

How does the device handle short circuit conditions?

It features internal short-circuit current limit protection. Special circuitry ensures that recovery from short circuit conditions does not lead to excessive overshoot of the output voltage.