AP7343D-19FS4-7B

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

The AP7343D-19FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a stable 1.9V output with a maximum current of 300mA. It operates within an input voltage range of 1.7V to 5.25V and features high power supply rejection ratio (PSRR) of 75dB at 1kHz. The device incorporates an enable pin for power control and includes internal protections such as thermal shutdown and current limiting. Packaged in the compact X2-DFN1010-4 (Type B) format, it supports surface mount assembly.

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

• Integrated enable pin allows precise power management and shutdown control
• High ripple rejection capability ensures clean power delivery for sensitive circuits
• Built-in discharge feature rapidly discharges output capacitor upon disable
• Compact footprint design facilitates dense PCB layout optimization

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

• RF power supply stages
• Portable video equipment
• Wireless communication modules
• Camera power systems

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

Verify the specific suffix 'D' indicates the inclusion of the auto-discharge function on the output node. Confirm the package code 'FS4' corresponds to the X2-DFN1010-4 (Type B) housing. Ensure the ordering suffix '7B' matches the required tape and reel packaging quantity. Cross-reference the identification code on the component marking against official documentation to confirm authenticity.

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

Select this variant when a fixed 1.9V rail is required with integrated output discharge capabilities. The X2-DFN1010-4 package is suitable for applications demanding minimal board space. Consider the quiescent current specifications for battery-operated designs requiring efficient standby modes. Verify that the load transient response meets the system's dynamic power requirements.

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

This component belongs to the AP7343 series of low dropout regulators designed for low-power handheld communication equipment. The series offers various fixed output voltages ranging from 0.9V to 3.6V. The 'D' designation specifically denotes versions equipped with an output discharge resistor, distinguishing them from standard variants without this feature.

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

AP7343-19FS4-7B

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 connected between the output and ground, which activates when the enable pin is low.

How does the enable pin operate?

Driving the EN pin high turns the regulator on, while pulling it low disables the output and activates the discharge function if present.