AP7343D-12FS4-7

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

The AP7343D-12FS4-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a nominal output voltage of 1.2V 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 (PSRR) of 75dB at 1kHz alongside low output noise of 60µVrms from 10Hz to 100kHz. The device incorporates an integrated enable pin for power control, built-in output discharge functionality, and thermal shutdown protection. Packaged in the compact X2-DFN1010-4 (Type B) format, it supports surface-mount assembly and maintains stable operation across an ambient temperature range of -40°C to +85°C.

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

• Integrated CMOS architecture delivering high output voltage accuracy and low quiescent current consumption
• Built-in output discharge mechanism that rapidly discharges the output capacitor when disabled
• High ripple rejection capability combined with ultra-low output noise for sensitive analog applications
• On-chip enable control allowing precise power management and system-level shutdown capabilities

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

• RF power supply circuits requiring low noise regulation
• Portable video equipment and media players
• Wireless communication adapters and modules
• Smartphone and tablet power distribution networks

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

Verify the specific suffix 'D' indicates the inclusion of the internal output discharge feature, which distinguishes this variant from non-discharge versions. Confirm the 'FS4' designation corresponds to the X2-DFN1010-4 package type required for your PCB footprint. Ensure the ordering code matches the exact 1.2V fixed output specification needed for your design parameters before finalizing procurement.

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

Select this component when a compact form factor is prioritized alongside strict low-noise requirements for RF or sensor interfaces. The integrated discharge function simplifies external circuitry compared to standard LDOs lacking this feature. Evaluate the thermal resistance characteristics of the X2-DFN1010-4 package against your expected power dissipation levels to ensure reliable operation under continuous 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 auto-discharge feature on the output pin, while 'FS4' identifies the small outline DFN package suitable for dense board layouts.

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

AP7343-12FS4-7B serves as a direct functional substitute if the output discharge feature is not required in the application design.