AP7343D-19W5-7

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

The AP7343D-19W5-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a nominal output voltage of 1.9 V with a guaranteed maximum load current of 300 mA. It operates within an input voltage range of 1.7 V to 5.25 V and features a typical power supply rejection ratio of 75 dB at 1 kHz. The device incorporates an enable pin for active control and includes built-in output discharge functionality. Packaged in the SOT-25-5 surface-mount format, it supports operation across an ambient temperature range from -40 °C to +85 °C.

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

• Integrated CMOS architecture enabling high output voltage accuracy and low quiescent current consumption.
• Built-in auto-discharge circuit that rapidly pulls down the output voltage when the device is disabled.
• Includes comprehensive protection mechanisms such as thermal shutdown and fold-back short-circuit current limiting.

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

• RF power supply circuits
• Portable video devices
• Wireless communication modules

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

Verify the specific suffix 'D' indicates the inclusion of the output discharge feature, which distinguishes this variant from non-discharge versions. Confirm the 'W5' designation corresponds to the SOT-25 package type required for your PCB layout. Ensure the ordering code matches the exact 1.9 V fixed output specification needed for your design.

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

Select this component when a compact solution with integrated output discharge is required to minimize standby power drain. The SOT-25 package offers a small footprint suitable for dense layouts. Verify that the input voltage remains above the minimum threshold of 1.7 V while maintaining sufficient headroom for the desired load current.

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

This part belongs to the AP7343 series of low-dropout regulators designed for low-power handheld equipment. The series provides various fixed output voltages ranging from 0.9 V to 3.6 V. The 'D' suffix specifically denotes the version equipped with an internal resistor network for output discharge upon shutdown.

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

AP7343-19W5-7 (Non-discharge variant)

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 feature, which actively pulls the output voltage to ground when the enable pin is deactivated.

How does the enable pin operate?

Driving the EN pin high turns the regulator on, while pulling it low activates the shutdown mode and engages the output discharge circuit.