AP7348D-1218RS4-7

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

The AP7348D-1218RS4-7 is a four-channel low dropout regulator from Diodes Incorporated, housed in an X1-DFN1612-8 (Type B) package. It provides fixed output voltages of 1.2V on Channels 1 and 2, and 1.8V on Channels 3 and 4. Each channel supports up to 300mA output current with ±1% accuracy. The device operates within a 1.7V to 5.25V input range, features 75dB ripple rejection at 1kHz, and consumes typically 160µA total quiescent current 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 precise voltage regulation.
• Dual enable inputs allowing synchronized control of paired channels or independent shutdown with active discharge.
• Integrated thermal shutdown and foldback current limiting to protect against overcurrent and overheating 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 and tape-and-reel packaging format. Confirm that the D suffix indicates the inclusion of the auto-discharge circuit for disabled channels. Ensure compatibility with RoHS 3 and halogen-free manufacturing standards required by your supply chain specifications.

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

Select this component when multiple regulated rails are needed in a compact footprint. Verify that the combined power dissipation across all four channels remains below the 600mW limit to prevent thermal shutdown. Ensure input capacitors meet the minimum 4.7µF requirement for stability and transient response under varying load conditions.

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

This part belongs to the AP7348 family of high PSRR low noise LDOs designed for low power handheld communication equipment. It utilizes a CMOS process to achieve low quiescent current and low output noise. The family offers various fixed voltage combinations to suit different system requirements while maintaining a consistent small form factor.

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

AP7348D-1528RS4-7

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 its associated channels and activates the internal discharge circuit.

What happens during a short circuit condition?

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