AP7343D-12FS4-7B

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

The AP7343D-12FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a stable 1.2V output with a guaranteed maximum current of 300mA. It operates within an input voltage range of 1.7V to 5.25V and features high power supply rejection ratio (PSRR) of 75dB at 1kHz alongside low output noise of 60µVrms from 10Hz to 100kHz. The device incorporates an enable pin for power control, built-in thermal shutdown, and overcurrent protection. It utilizes the X2-DFN1010-4 (Type B) package and includes an integrated discharge resistor for rapid output voltage decay upon shutdown.

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

• Integrated enable pin allows precise on/off control and reduces standby current consumption
• Built-in auto-discharge function ensures rapid output voltage decay when disabled
• High ripple rejection capability minimizes power supply noise in sensitive circuits
• Low quiescent current design optimizes battery life in portable applications

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

• RF power supplies
• Portable media players
• Wireless communication modules
• Smartphones and tablets

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

Verify the specific suffix '7B' corresponds to the X2-DFN1010-4 (Type B) package configuration as defined in the manufacturer's ordering guide. Confirm that the 'D' designation indicates the inclusion of the internal output discharge feature, which differs from non-discharge variants. Ensure compatibility with RoHS 3 compliance requirements before finalizing procurement specifications.

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

Select this component when a compact footprint is required alongside high PSRR performance for noise-sensitive loads. The 1.2V fixed output suits digital logic or sensor rails requiring tight accuracy. Consider the thermal resistance characteristics of the X2-DFN1010-4 package for PCB layout planning to ensure adequate heat dissipation under maximum load conditions.

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

This part belongs to the AP7343 family of low dropout regulators designed for handheld communication equipment. The series offers various fixed output voltages ranging from 0.9V to 3.6V. The 'D' variant specifically adds an auto-discharge feature, while the 'FS4' code denotes the small form-factor DFN package suitable for dense PCB layouts.

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

AP7343-12FS4-7B

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

What is the function of the 'D' suffix in the part number?

The 'D' suffix indicates that the regulator includes an integrated N-channel auto-discharge resistor, which rapidly pulls the output voltage to ground when the enable pin is deactivated.

How does the enable pin operate?

Driving the EN pin high turns the regulator on, while pulling it low activates shutdown mode. The pin must not be left floating to ensure proper operation.