AP7331-33WG-7

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

The AP7331-33WG-7 is a fixed-output low dropout linear regulator manufactured by Diodes Incorporated. It provides a stable 3.3V output with a maximum continuous load current of 300mA. The device operates within an input voltage range of 2V to 6V and features a typical quiescent current of 65µA across the full load range. It utilizes a SOT-25 surface-mount package and includes built-in current limit, short circuit, and thermal shutdown protections. The unit maintains stability with low ESR ceramic capacitors and offers fast transient response characteristics.

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

• Integrated enable pin for active-high control of power states
• Built-in protection mechanisms including current limiting, short circuit prevention, and thermal shutdown
• Fast start-up time and excellent load/line transient response capabilities
• Operates stably with small value low ESR ceramic output capacitors

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

• XDSL Routers
• Wireless LAN Cards
• Desktop and Notebook Computers
• Battery Powered Equipments

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

Verify that the component matches the specific 3.3V fixed output variant designated by the '33' suffix in the part number. Confirm the package type corresponds to the 'W' designation for SOT-25. Ensure the ordering suffix '-7' indicates tape and reel packaging if required for automated assembly processes. Cross-reference the manufacturer marking code QS for the SOT-25 package to validate authenticity against official documentation.

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

Select this component when a fixed 3.3V rail is required from an input source between 2V and 6V. The low quiescent current makes it suitable for battery-operated systems where standby power consumption must be minimized. The SOT-25 package is appropriate for space-constrained designs requiring surface mount technology. Verify that the application load does not exceed the 300mA continuous rating to ensure reliable operation within the specified temperature range.

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

This device belongs to the AP7331 series of low dropout regulators designed for portable and low-power applications. The series supports both adjustable and fixed output configurations, offering flexibility in system design. The AP7331-33WG-7 specifically addresses the need for a regulated 3.3V supply in compact electronic devices, leveraging the efficiency and speed of modern LDO architectures.

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

AP7331-33SNG-7 (DFN2020-6 Package)

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

What is the minimum capacitance required for input stability?

A 1µF ceramic capacitor is recommended between the VIN and GND pins to decouple input power supply glitches and noise.

How does the device handle over-current conditions?

The AP7331-33WG-7 includes current limit protection that clamps the output current to approximately 600mA to prevent damage during over-current events.