AP7348D-1828RS4-7

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

The AP7348D-1828RS4-7 is a four-channel low dropout regulator from Diodes Incorporated, housed in an X1-DFN1612-8 package. It provides fixed output voltages of 1.8V on channels 1 and 2, and 2.8V on channels 3 and 4. Each channel supports up to 300mA output current with a total input voltage range of 1.7V to 5.25V. The device features high power supply rejection ratio (PSRR) of 75dB at 1kHz and low output noise of 60µVrms. Quiescent current is typically 160µA when all channels are enabled.

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

• Four independent LDO channels with individual error amplifiers and resistor networks for fixed voltage outputs.
• Dual enable inputs allowing independent control of paired channels with integrated auto-discharge circuits upon shutdown.
• Integrated thermal shutdown and foldback current limiting protection for each channel to ensure safe operation under fault 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 confirms the X1-DFN1612-8 package type and tape-and-reel packaging quantity. Confirm that the internal marking code GA3 corresponds to the requested 1.8V and 2.8V output configuration. Ensure compliance requirements such as RoHS and halogen-free status align with project specifications before finalizing procurement orders.

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

Select this component when multiple regulated rails are required within a compact footprint. The dual enable structure simplifies power sequencing by grouping channels. Verify that the combined power dissipation across all active channels remains below the maximum rating to prevent thermal shutdown. Ensure input capacitors meet minimum stability requirements for reliable transient response.

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

This part belongs to the AP7348 family of four-channel LDOs designed for portable electronics. It utilizes a CMOS process to achieve low quiescent current and high PSRR. The family offers various fixed voltage combinations to suit different logic levels. The X1-DFN1612-8 package provides a small surface-mount solution suitable for dense PCB layouts in modern handheld devices.

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

AP7348D-1818RS4-7

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 low disables the associated channels and activates their discharge circuits.

What happens during a short circuit condition?

Short circuit protection triggers and clamps the output current to approximately 55mA per channel to protect the regulator from damage due to overheating.