AP7343D-28W5-7

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

The AP7343D-28W5-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a nominal output voltage of 2.8V with a guaranteed maximum load current of 300mA. It operates within an input voltage range of 1.7V to 5.25V and features high power supply rejection ratio (PSRR) of 75dB at 1kHz alongside low output noise of 60µVrms from 10Hz to 100kHz. The device incorporates an enable pin for power control, integrated discharge circuitry for rapid output voltage decay upon shutdown, and thermal shutdown protection. Packaged in the compact SOT-25-5 surface-mount format, it supports an ambient operating temperature range from -40°C to +85°C.

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

• Integrated auto-discharge function ensures rapid output voltage decay when disabled
• High ripple rejection ratio minimizes power supply noise influence on sensitive loads
• Low quiescent current consumption optimizes battery life in portable applications
• Built-in thermal shutdown and fold-back current limit protect against overload conditions

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

• RF power supply circuits
• Portable video devices
• Wireless communication modules
• Camera systems

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

Verify the specific suffix 'D' indicates the presence of the internal output discharge resistor, which distinguishes this variant from non-discharge versions. Confirm the 'W5' package code corresponds to the SOT-25-5 footprint required for your PCB layout. Ensure the ordering quantity aligns with the standard tape and reel packaging specifications provided by the manufacturer.

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

Select this component when a stable 2.8V rail is required with minimal board space due to the small SOT-25 package. The integrated discharge feature makes it suitable for systems requiring fast power-down sequences. Verify that the input voltage remains above the dropout threshold across the full load and temperature range to maintain regulation accuracy.

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

This part belongs to the AP7343 family of CMOS low dropout regulators designed for handheld and portable equipment. The series offers various fixed output voltages ranging from 0.9V to 3.6V. The 'D' designation specifically denotes the inclusion of an output discharge path, while the 'W5' suffix identifies the five-pin SOT-25 surface-mount package configuration.

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

AP7343-28W5-7

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

What is the function of the EN pin?

The Enable pin controls the regulator's operation state. Driving this pin high turns the regulator on, while pulling it low activates the shutdown mode and engages the internal discharge resistor.

How does the AP7343D differ from the standard AP7343?

The AP7343D variant includes an integrated N-channel auto-discharge resistor connected between the output and ground. This allows the output voltage to decay rapidly when the device is disabled, unlike the standard version which lacks this feature.