AP7348D-1833RS4-7

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

The AP7348D-1833RS4-7 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 1.8V on channels 1 and 2, and 3.3V on channels 3 and 4. The device supports a wide input voltage range from 1.7V to 5.25V, delivering up to 300mA per channel with ±1% output accuracy. Key electrical characteristics include a typical quiescent current of 160µA, 75dB ripple rejection at 1kHz, and 60µVrms output noise. It features independent enable control via two pins, auto-discharge upon shutdown, and operates within a -40°C to +85°C temperature range.

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

• Four independent LDO channels with dual enable inputs for flexible power sequencing
• High power supply ripple rejection and ultra-low output noise for sensitive RF applications
• Integrated thermal shutdown and foldback short-circuit protection for enhanced reliability
• Auto-discharge circuitry ensures rapid output voltage decay when disabled

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 package and tape-and-reel quantity. Ensure the design accommodates the required input and output capacitors as specified in the datasheet application information. Confirm that the total power dissipation across all four channels remains within the 600mW limit to prevent thermal shutdown activation during operation.

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

Select this component when multiple regulated rails are needed in a compact footprint. The dual enable architecture allows grouping channels for synchronized power management. Verify that the load transient requirements align with the recommended ceramic capacitor specifications. Consider the thermal resistance characteristics if high ambient temperatures or dense PCB layouts are present in the target application.

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

This part belongs to the AP7348 family of four-channel LDOs manufactured by Diodes Incorporated. The series utilizes a CMOS process to achieve low dropout and high PSRR. Variations within the family differ primarily in the fixed output voltage combinations assigned to the four channels, while maintaining identical package dimensions and core functional protections.

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

Direct substitutes must match the four-channel configuration and X1-DFN1612-8 package. Verify pinout compatibility, specifically the placement of EN1, EN2, VDD, and GND pins. Ensure replacement parts offer equivalent ripple rejection and output noise specifications for RF-sensitive designs.

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 activates its associated channels.

What happens to the outputs when the device is disabled?

An integrated discharge circuit automatically pulls the output voltage down when the respective enable pin is pulled low, ensuring a known system state.

Is the thermal pad electrically connected to ground?

The thermal pad can be left open or connected to ground; however, it must be soldered to the PCB for proper thermal dissipation and does not replace the Pin 1 ground connection.