AP7341D-31FS4-7

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

The AP7341D-31FS4-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated. It provides a nominal output voltage of 3.1V with an accuracy of ±1% at +25°C and ±1.5% across the operating temperature range. The device supports a maximum output current of 300mA within an input voltage range of 1.7V to 5.25V. Key electrical characteristics include a typical quiescent current of 35µA, a ripple rejection ratio of 75dB at 1kHz, and an output noise voltage of 60µVrms from 10Hz to 100kHz. Dropout voltage varies based on load current and output voltage, ranging from approximately 0.21V to 0.65V under specified conditions.

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

• Integrated enable pin for power control and shutdown mode management
• Built-in short circuit protection that clamps output current during faults
• CMOS process technology ensuring low power consumption and high efficiency
• High ripple rejection capability suitable for sensitive RF applications

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

• Smart Phone/Pad
• RF Supply
• Cameras
• Portable Video
• Wireless Communication

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

Verify the specific ordering suffix 'D' indicates the presence of an internal auto-discharge feature on the output when disabled. Confirm package type X2-DFN1010-4 matches PCB footprint requirements. Ensure EN pin drive signals meet specified voltage thresholds for reliable switching between active and standby states.

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

Select this component for designs requiring a precise 3.1V rail in space-constrained environments. The X2-DFN1010-4 package offers a minimal footprint for dense layouts. Consider the 300mA current limit and thermal dissipation capabilities when designing for high ambient temperatures or heavy loads.

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

This part belongs to the AP7341 series of low dropout regulators designed for handheld communication equipment. The series utilizes CMOS technology to achieve low quiescent current and high power supply rejection ratios. The AP7341D variant specifically includes an output discharge resistor for faster shutdown times compared to non-discharge versions.

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

AP7341-31FS4-7 (Non-discharge version)

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

What is the function of the EN pin?

The EN pin controls the regulator's operation. Driving it high enables the output, while pulling it low activates shutdown mode. It must not be left floating.

How does the 'D' suffix affect the device behavior?

The 'D' suffix indicates the device includes an integrated N-channel auto-discharge resistor. When the EN pin is low, this resistor discharges the output capacitor to ground.

What is the recommended input capacitor value?

A minimum 0.47μF ceramic capacitor is recommended between the VIN and GND pins to decouple input power supply glitches and ensure stability.