AP7331-28SNG-7

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

The AP7331-28SNG-7 is a fixed-output low dropout linear regulator manufactured by Diodes Incorporated, providing a stable 2.8V output with a maximum load current of 300mA. It operates within an input voltage range of 2V to 6V and features a typical quiescent current of 65µA. The device utilizes a DFN2020-6 package and includes built-in current limit, short circuit, and thermal shutdown protections. It achieves a typical power supply rejection ratio (PSRR) of 65dB at 100Hz and maintains stability with low ESR ceramic capacitors.

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

• Integrated protection mechanisms including current limiting, short circuit prevention, and thermal shutdown for fault condition safety.
• Fast transient response capability designed to support rapidly changing loads in digital signal processing and communication chipsets.
• Ultra-fast start-up time enabling rapid transitions between active and standby modes to conserve battery life.
• Operates stably with small value low ESR ceramic output capacitors, simplifying board layout and component selection.

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 the specific suffix 'SNG' confirms the DFN2020-6 package and 2.8V fixed output configuration against official Diodes Incorporated documentation. Ensure compatibility with RoHS compliance standards required for your manufacturing region. Confirm that the supplier provides traceability to the original manufacturer to avoid counterfeit components. Check for any recent product change notifications regarding pinout or electrical characteristics before finalizing procurement contracts.

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

Select this component when a fixed 2.8V rail is required from a 2V to 6V input source with moderate current demands up to 300mA. It is suitable for designs prioritizing low ground current consumption and fast dynamic response over ultra-low noise performance. Consider the DFN2020-6 package constraints for thermal dissipation and PCB copper area requirements. Evaluate if the internal reference voltage accuracy meets the system's voltage tolerance specifications under varying ambient temperatures.

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

This part belongs to the AP7331 family of low dropout regulators, which offers both adjustable and fixed output variants. The series is engineered for portable electronics requiring efficient power management. While other members of the family provide different output voltages or utilize SOT25 packaging, the AP7331-28SNG-7 specifically targets applications needing a compact footprint with a precise 2.8V regulation point.

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

Direct substitutes include other AP7331 variants with identical DFN2020-6 footprints but different output voltages, such as AP7331-33SNG-7 for 3.3V needs. Cross-brand replacements require matching the 300mA current rating, 2V-6V input range, and DFN2020-6 package dimensions. Verify pinout compatibility and thermal resistance values before integrating alternative LDOs into existing layouts.

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

What is the minimum capacitance required for stable operation?

The AP7331-28SNG-7 requires a minimum of 1µF ceramic capacitor on both the input and output pins to ensure stability and proper transient response.

How does the device handle short circuit conditions?

When the output voltage drops below approximately 200mV due to a short circuit, the internal protection circuitry clamps the output current to roughly 100mA to prevent damage.

Can the enable pin be left floating?

No, the enable pin must be actively driven. To keep the regulator permanently on, tie the EN pin to the VIN pin; leaving it floating may result in unpredictable startup behavior.