AP7353D-31CV4-7

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

The AP7353D-31CV4-7 is a low dropout regulator manufactured by Diodes Incorporated, featuring a fixed output voltage of 3.1V and a maximum output current of 250mA. It operates within an input voltage range of 2.0V to 5.5V and maintains a quiescent current as low as 18µA. The device provides high power supply rejection ratio (PSRR) of 90dB at 1kHz and low output noise of 10µVrms from 10Hz to 100kHz. Packaged in the X1-WLB0707-4 (Type A1) format, it includes an enable pin for control and built-in output discharge functionality.

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

• Integrated N-channel auto-discharge resistor that activates when the enable pin is pulled low, ensuring rapid output voltage decay.
• High ripple rejection capability with PSRR reaching 90dB at 1kHz, supporting stable operation in sensitive analog circuits.
• Low output noise characteristic suitable for RF supplies and precision handheld or wearable communication equipment.
• Built-in thermal shutdown and short-circuit protection mechanisms safeguard the regulator under abnormal operating conditions.

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

• RF power supplies
• Smartphones and tablets
• Portable video devices
• Wireless adaptors

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

Verify the specific suffix 'D' indicates the inclusion of the internal output discharge feature, distinguishing it from standard non-discharge variants. Confirm the package code 'CV4' corresponds to the X1-WLB0707-4 footprint. Ensure the ordering quantity aligns with the manufacturer's tape and reel specifications for this component type.

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

Select this variant when system design requires automatic output voltage discharge upon shutdown to meet safety or power-down timing requirements. The 3.1V fixed output is appropriate for powering components requiring this specific rail. Consider the low quiescent current for battery-operated applications where standby power consumption is critical.

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 offers various fixed output voltages ranging from 1.8V to 4.7V. The 'D' designation specifically denotes the version equipped with an integrated output discharge function, providing enhanced control over the output state during disable periods compared to the standard AP7353 models.

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

AP7353-31CV4-7

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. This feature automatically discharges the output capacitor when the enable pin is driven low, ensuring the output voltage drops rapidly.

How does the enable pin operate?

The regulator is turned on by driving the EN pin high and enters shutdown mode when the EN pin is pulled low. If the enable feature is not utilized, the EN pin should be tied to the IN pin to keep the regulator permanently active.