AP7348D-3318RS4-7

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

The AP7348D-3318RS4-7 is a four-channel low dropout regulator from Diodes Incorporated, housed in an X1-DFN1612-8 package. It provides fixed output voltages of 3.3V on channels 1 and 2, and 1.8V on channels 3 and 4. Each channel supports up to 300mA output current within a 1.7V to 5.25V input voltage range. The device features 75dB ripple rejection at 1kHz, 60µVrms output noise, and ±1% output accuracy. Quiescent current is typically 160µA with all channels enabled.

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

• Four independent LDO channels with dual enable pins for grouped control
• High power supply rejection ratio and ultra-low output noise
• Integrated thermal shutdown and foldback short-circuit protection
• Auto-discharge circuitry ensures safe system startup upon deactivation

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

• Smartphones and tablets
• Wi-Fi access points
• Communication modules
• Camera modules and appliances
• RF supply for IoT/LPWAN devices

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

Verify the specific ordering suffix RS4-7 confirms the X1-DFN1612-8 Type B package and tape-and-reel packaging format. Ensure the manufacturer is confirmed as Diodes Incorporated. Cross-reference the part number against official datasheets to validate the 3.3V and 1.8V fixed output configuration before procurement.

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

Select this component when multiple distinct voltage rails are required from a single footprint. The dual enable architecture allows simultaneous control of paired channels. Verify that the total power dissipation remains below 600mW despite individual channel capabilities. Confirm compatibility with low-ESR ceramic capacitors for stability.

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

This device belongs to the AP7348 family of high-performance, multi-output linear regulators designed for space-constrained portable electronics. It utilizes a CMOS process to achieve low quiescent current and high PSRR. The integrated discharge feature distinguishes it from standard LDOs by ensuring predictable power-up states.

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

AP7348D-3318RH4-7

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

How does the enable pin configuration operate?

EN1 controls Channels 1 and 3 simultaneously, while EN2 independently controls Channels 2 and 4.

What happens to the outputs when the device is disabled?

An internal auto-discharge circuit activates, pulling the output voltage down to ensure a known state during shutdown.