AP7353D-45CV4-7

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

The AP7353D-45CV4-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a stable 4.5V output with a maximum current of 250mA. It operates within an input voltage range of 2.0V to 5.5V and features high power supply rejection ratio (PSRR) of 90dB at 1kHz and low output noise of 10µVrms from 10Hz to 100kHz. The device incorporates an enable pin for power control and includes built-in short-circuit protection and thermal shutdown. It utilizes the X1-WLB0707-4 package and offers ±1% output voltage accuracy.

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

• Integrated auto-discharge circuitry that rapidly pulls down the output voltage when the enable pin is deactivated.
• High ripple rejection capability combined with ultra-low output noise suitable for sensitive RF circuits.
• Built-in overcurrent and thermal protection mechanisms to safeguard against short circuits and overheating.

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

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

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 differentiates it from standard variants. Confirm the 'CV4' designation corresponds to the X1-WLB0707-4 package type required for your PCB layout. Ensure compatibility with RoHS 3 standards if environmental compliance is mandatory for your manufacturing process.

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

Select this component when a fixed 4.5V rail is required alongside strict low-noise specifications for analog or RF sections. The integrated discharge function simplifies system power sequencing by preventing floating outputs during standby modes. Evaluate the thermal resistance characteristics of the WLB package to ensure adequate heat dissipation under maximum load conditions in confined spaces.

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

This part belongs to the AP7353 family of CMOS low dropout regulators designed for handheld and wearable devices. The series emphasizes low quiescent current and high PSRR to extend battery life while maintaining signal integrity. The AP7353D variant specifically adds the auto-discharge functionality to enhance system power management efficiency.

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

AP7353-45CV4-7

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

What is the primary function of the 'D' suffix in the AP7353D-45CV4-7?

The 'D' suffix indicates that the regulator includes an internal N-channel auto-discharge resistor connected to the output. This feature actively pulls the output voltage to ground when the enable pin is driven low, ensuring a fast turn-off response.

How does the AP7353D handle short-circuit conditions?

The device incorporates short-circuit protection that clamps the output current to approximately 350mA when the output is shorted to ground. This protects the regulator from damage due to excessive current flow.