AP7348D-1818RS4-7

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

The AP7348D-1818RS4-7 is a four-channel low dropout regulator from Diodes Incorporated, housed in an X1-DFN1612-8 (Type B) package. It provides fixed 1.8V outputs on all channels with a maximum output current of 300mA per channel and a total power dissipation limit of 600mW. The device operates within a 1.7V to 5.25V input voltage range, featuring a typical quiescent current of 160µA when all channels are enabled. It includes independent enable inputs for grouped channel control, integrated auto-discharge circuits, and thermal shutdown protection.

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

• Four independent LDO channels with individual error amplifiers and foldback current limiting
• Dual enable pins allowing grouped control of Channel 1/3 and Channel 2/4
• Integrated active discharge circuitry for rapid output voltage decay upon shutdown
• High ripple rejection capability combined with low output noise characteristics

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 configuration. Ensure that the dual 1.8V output requirement matches the internal resistor network configuration. Confirm compliance with RoHS 3 and Halogen-free standards if required by the target assembly process. Validate that the PCB layout accommodates the thermal pad requirements specified in the datasheet.

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

Select this component when multiple regulated rails are needed from a single footprint. The dual enable architecture simplifies power sequencing for paired loads. Verify that the total system power dissipation remains below the 600mW absolute maximum rating to prevent thermal shutdown. Consider the 1.7V minimum input voltage constraint against the lowest expected supply rail during operation.

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

This part belongs to the AP7348 family of multi-channel LDOs designed for space-constrained portable electronics. The 'D' suffix indicates the inclusion of output discharge features, while '1818' specifies the fixed 1.8V output voltages for both channel pairs. The device utilizes a CMOS process to achieve high efficiency and low noise performance suitable for sensitive RF applications.

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

AP7348D-1815RS4-7: Provides 1.8V on Channels 1/2 and 1.5V on Channels 3/4.

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

How are the four channels controlled via the enable pins?

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

What happens to the output voltage when the device is disabled?

The integrated discharge circuit actively pulls the output voltage down to ensure a known state.