AP7311-33WG-7

Overview

The AP7311-33WG-7 is a fixed-output low dropout linear regulator manufactured by Diodes Incorporated. It provides a stable 3.3V output with a maximum load current of 150mA. The device operates within an input voltage range of 2V to 6V and maintains a typical quiescent current of 65µA across the full load spectrum. It features a fast start-up time of 80µs and excellent transient response characteristics. The regulator includes built-in current limit, short circuit, and thermal shutdown protections. It is housed in a compact SOT-25 package and is designed for operation at ambient temperatures between -40°C and +85°C.

Feature Summary

• Ultra-fast start-up time enables rapid power delivery without sacrificing low ground current consumption.
• High power supply rejection ratio ensures effective noise suppression from input sources.
• Integrated protection mechanisms include current limiting, short-circuit clamping, and thermal shutdown to prevent damage during fault conditions.
• Stable operation is maintained using small-value ceramic capacitors with low equivalent series resistance.

Applications

• Battery-powered portable devices
• Notebook and desktop computer peripherals
• CD-ROM, DVD, and LAN cards

Procurement Notes

Verify that the component matches the specific fixed 3.3V output variant rather than the adjustable version. Confirm the SOT-25 package type and Green molding compound designation. Ensure compliance with RoHS directives and lead-free finish requirements as specified in the manufacturer documentation before finalizing procurement orders.

Selection Notes

Select this regulator when a fixed 3.3V rail is required with minimal external component count. It is suitable for applications demanding fast transient response and low standby current. Verify that the input voltage remains within the 2V to 6V operational window. Ensure the load current does not exceed 150mA and that adequate thermal dissipation is available within the specified temperature range.

Part Context

This component belongs to the AP7311 family of low dropout regulators. The family offers both adjustable and fixed output options. The AP7311 series is engineered for low-power applications requiring high efficiency and quick response times. It utilizes a CMOS process to achieve low quiescent current while maintaining robust performance under varying load conditions.

Replacement Considerations

Direct substitutes within the same family include other AP7311 variants with different output voltages or adjustable configurations. Cross-family replacements require matching electrical parameters such as output voltage, current capacity, and package dimensions.

FAQ

What is the typical quiescent current of the AP7311-33WG-7?

The typical quiescent current is approximately 65µA over the full load range.

How does the AP7311 handle short circuit conditions?

It triggers short circuit protection when the output voltage drops below 200mV, clamping the output current to approximately 50mA.

What is the minimum recommended output capacitor value?

A 1µF ceramic capacitor is recommended for the output to ensure stability and proper transient response.