AP7353D-31FS4-7

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

The AP7353D-31FS4-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a nominal output voltage of 3.1V with an accuracy of ±1%. It supports a guaranteed output current of 250mA and operates within an input voltage range of 2.0V to 5.5V. The device features high power supply rejection ratio (PSRR) of 90dB at 1kHz and low output noise of 10µVrms from 10Hz to 100kHz. Quiescent current is typically 18µA, while standby current drops to 0.1µA when disabled. Packaged in the X2-DFN1010-4 footprint, it includes built-in thermal shutdown and short-circuit protection.

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

• Integrated N-channel auto-discharge resistor network that rapidly discharges the output capacitor upon disablement
• High ripple rejection capability ensuring stable operation under varying load conditions
• Low quiescent current design optimized for battery-powered applications
• Built-in thermal shutdown and current limit circuitry for enhanced reliability

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

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

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

Verify the specific package type and marking code against the official datasheet before procurement. Confirm that the ordering suffix matches the required tape and reel quantity. Ensure compatibility with RoHS 3 and REACH regulations if applicable to your region. Cross-reference the manufacturer part number directly with authorized distributors to avoid counterfeit components.

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

Select this component when a fixed 3.1V rail is required with minimal board space due to its compact X2-DFN1010-4 package. The integrated discharge feature makes it suitable for systems requiring rapid power-down states. Consider the low PSRR performance for sensitive RF circuits where noise suppression is critical. Evaluate the dropout voltage characteristics relative to the minimum expected input voltage during peak load currents.

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

This part belongs to the AP7353 series of low dropout regulators designed for handheld and wearable electronics. The 'D' suffix indicates the inclusion of an internal output discharge resistor, distinguishing it from standard versions. The 'FS4' designation specifies the X2-DFN1010-4 surface mount package. This series targets applications demanding high precision and low power consumption.

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

AP7353-31FS4-7

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

What is the function of the EN pin?

The EN pin controls the regulator's state; driving it high enables the output, while pulling it low activates the shutdown mode and engages the internal discharge resistor.

How does the AP7353D differ from the standard AP7353?

The AP7353D variant includes an integrated N-channel auto-discharge resistor that actively pulls down the output voltage when the enable pin is low, whereas the standard version lacks this feature.