AP7353D-33FS4-7

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

The AP7353D-33FS4-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated. It provides a nominal output voltage of 3.3V with an accuracy of ±1%. The device supports a maximum output current of 250mA and operates within an input voltage range of 2.0V to 5.5V. Key electrical characteristics include a typical quiescent current of 18µA, a ripple rejection ratio of 90dB at 1kHz, and an output noise voltage of 10µVrms from 10Hz to 100kHz. The component is housed in an X2-DFN1010-4 package and functions reliably across an ambient temperature range of -40°C to +85°C.

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

• Integrated enable pin for power control and shutdown mode management
• Built-in auto-discharge circuit to rapidly reduce output voltage when disabled
• High power supply ripple rejection capability for sensitive analog circuits
• Low output noise performance suitable for RF signal paths

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

• Smartphones and tablet computers
• RF power supply modules
• Portable video recording devices
• Wireless communication adaptors

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

Verify the specific suffix FS4 corresponds to the X2-DFN1010-4 package type required for your PCB layout. Confirm that the D suffix indicates the inclusion of the internal discharge resistor, as this affects the behavior of the output pin during shutdown states. Ensure compatibility with RoHS 3 compliance standards before finalizing procurement orders.

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

Select this component when a stable 3.3V rail is required for noise-sensitive applications such as RF sections or camera sensors. The integrated discharge feature distinguishes it from non-discharge variants, making it appropriate for systems requiring rapid power-down sequencing. Verify that the 250mA current capacity meets the peak load requirements of the target circuit design.

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 series utilizes a CMOS process to achieve high efficiency and low static current consumption. The AP7353D variant specifically incorporates an output discharge function, differentiating it from standard AP7353 models which lack this feature.

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

AP7353-33FS4-7 (Non-discharge version)

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 internal auto-discharge resistor connected to the output pin, which actively pulls the voltage down when the enable pin is set to a low state.

How does the enable pin operate?

The regulator is enabled when the EN pin voltage is driven high, typically above 1.2V. Pulling the EN pin low activates the shutdown mode, engaging the standby current limit and the output discharge circuit.