AP7348D-3328RS4-7

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

The AP7348D-3328RS4-7 is a four-channel low dropout regulator from Diodes Incorporated. It provides fixed output voltages of 3.3V on channels 1 and 2, and 2.8V on channels 3 and 4. Each channel supports an output current of up to 300mA with a total input voltage range of 1.7V to 5.25V. The device features a typical ripple rejection of 75dB at 1kHz and a low output noise of 60µVrms. Quiescent current is typically 160µA when all channels are enabled. It operates within a temperature range of -40°C to +85°C and utilizes an X1-DFN1612-8 package.

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

• Four independent output channels with individual error amplifiers and resistor networks for fixed voltage regulation.
• Dual enable inputs (EN1 and EN2) allowing grouped control of channels with integrated auto-discharge circuits upon shutdown.
• Integrated protection mechanisms including per-channel over-temperature sensing and foldback current limiting during short-circuit conditions.

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

• Smart Phone/Tablet
• WIFI Access Points
• Communication Module
• Camera Module, Appliances
• RF Supply for IOT/LPWAN

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

Verify the specific ordering suffix RS4-7 corresponds to the X1-DFN1612-8 package and tape-and-reel packaging configuration. Confirm that the internal marking codes match the required 3.3V and 2.8V output combination. Ensure compliance with RoHS and halogen-free requirements as specified in the manufacturer documentation before finalizing procurement orders.

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

Select this component when multiple regulated rails are required in a compact footprint. The dual enable pins allow synchronized power sequencing for paired channels. Verify that the total power dissipation remains below the maximum rating to prevent thermal shutdown. Ensure adequate ceramic capacitors are placed near the pins to maintain stability across the operating load range.

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

This part belongs to the AP7348 series of high PSRR low noise LDOs. The series offers four channels in a small DFN package designed for dense PCB layouts. It targets low-power handheld communication equipment requiring stable power supplies with minimal noise interference for sensitive RF and digital components.

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

Direct substitutes must match the four-channel architecture, 300mA per channel capability, and identical 3.3V/2.8V output configuration. Verify pin compatibility with the X1-DFN1612-8 package. Check if alternative parts support the same dual-enable functionality and discharge circuit requirements.

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

How are the four channels controlled?

Channels 1 and 3 are controlled by EN1, while Channels 2 and 4 are controlled by EN2. Pulling an enable pin high turns on its associated channels, and pulling it low disables them and activates the discharge circuit.

What happens during a short circuit condition?

The device triggers short circuit protection which clamps the output current to approximately 55mA via foldback current limiting to protect the regulator from damage.