AP7353D-45FS4-7

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

The AP7353D-45FS4-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a stable 4.5V output with a maximum current capacity of 250mA. It operates within an input voltage range of 2.0V to 5.5V and features a typical quiescent current of 18µA. The device incorporates high power supply rejection ratio (PSRR) performance and low output noise characteristics. It includes integrated thermal shutdown and short-circuit protection mechanisms. The component is housed in an X2-DFN1010-4 package and supports an operating ambient temperature range from -40°C to +85°C.

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

• Integrated enable pin for precise power management control
• High ripple rejection capability suitable for sensitive RF applications
• Built-in auto-discharge circuitry for rapid output voltage decay upon shutdown
• Low output noise profile ensuring clean power delivery

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

• RF power supplies
• Smartphones and tablets
• Portable video devices
• Wireless communication equipment

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

Verify the specific suffix FS4 corresponds to the X2-DFN1010-4 package type when sourcing. Confirm that the 'D' designation indicates the inclusion of the internal discharge resistor network. Ensure compatibility with standard surface mount assembly processes and verify RoHS compliance documentation prior to final procurement authorization.

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

Select this variant when a fixed 4.5V rail is required alongside strict space constraints due to its compact footprint. The inclusion of the enable pin allows for system-level power sequencing and standby mode optimization. Consider the thermal dissipation requirements based on the voltage differential between the input source and the regulated output under maximum load conditions.

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

This component belongs to the AP7353 series of low dropout regulators designed for portable electronics. The series emphasizes low noise and high PSRR to support analog and radio frequency circuits. The AP7353D variant specifically adds an output discharge feature not present in the standard AP7353 model, enhancing safety during power-down states.

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

AP7353-45FS4-7

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 connected to the output pin, which rapidly discharges the output capacitor when the device is disabled.

How does the enable pin operate?

The enable pin controls the state of the regulator; driving it high activates the output, while pulling it low disables the regulator and engages the output discharge circuit.