AP7343D-31FS4-7B

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

The AP7343D-31FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a precise 3.1V 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. Quiescent current is maintained at a typical value of 35µA, while the package utilizes the X2-DFN1010-4 (Type B) footprint.

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

• Integrated enable pin allows for active power control and shutdown functionality
• High ripple rejection capability ensures stable operation in noisy environments
• Built-in discharge feature rapidly discharges output capacitor upon disable
• CMOS process technology enables low quiescent current consumption

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

• RF power supply circuits
• Portable media players
• Wireless communication modules
• Smart phone and tablet subsystems

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

Verify the specific suffix '7B' corresponds to the required 10,000-unit tape and reel packaging configuration. Confirm that the 'D' designation indicates the inclusion of the auto-discharge function on the output node. Ensure the ordering code matches the exact 3.1V fixed voltage requirement for the target application design.

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

Select this component when a compact surface-mount solution is required for low-noise analog or RF sections. The X2-DFN1010-4 package offers minimal PCB area usage compared to traditional SOT packages. Consider the thermal resistance characteristics if operating near maximum load currents or elevated ambient temperatures.

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

This part belongs to the AP7343 family of high PSRR low-noise LDOs designed for portable handheld equipment. The series provides various fixed output voltages ranging from 0.9V to 3.6V. The 'D' variant specifically includes an internal discharge resistor, distinguishing it from standard versions without this feature.

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

AP7343-31FS4-7B serves as a direct functional substitute lacking the discharge feature. AP7343D-31W5-7B provides identical electrical specifications but utilizes the SOT25 package instead of the DFN form factor.