AP7343D-21FS4-7B

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

The AP7343D-21FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a precise 2.1V output with a guaranteed maximum load current of 300mA. It operates within an input voltage range of 1.7V to 5.25V and features high power supply rejection ratio performance of 75dB at 1kHz alongside low output noise of 60µVrms from 10Hz to 100kHz. The device incorporates an enable pin for power management control and includes built-in thermal shutdown and fold-back short-circuit protection. It utilizes the X2-DFN1010-4 (Type B) surface-mount package.

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

• Integrated enable pin allows for active power control and shutdown mode management
• Built-in auto-discharge circuit ensures rapid output voltage decay when disabled
• High ripple rejection capability minimizes power supply noise interference
• Low quiescent current consumption optimizes efficiency in portable applications

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

• RF power supply circuits
• Portable video equipment
• Wireless communication modules
• Camera systems

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

Verify the specific ordering suffix '7B' corresponds to the required 10,000-unit tape and reel packaging configuration. Confirm that the 'D' designation indicates the inclusion of the internal output discharge feature, as this affects turn-off behavior compared to 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 stable 2.1V rail is required for sensitive analog or RF loads. The integrated discharge function distinguishes it from standard versions, making it suitable for applications requiring fast output voltage collapse. Verify that the input voltage remains sufficiently above the output to maintain regulation 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' suffix specifically denotes the version equipped with an internal N-channel auto-discharge resistor, differentiating it from the base AP7343 model which lacks this feature.

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

AP7343-21FS4-7B serves as the non-discharge equivalent within the same package.