AP7343D-12W5-7

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

The AP7343D-12W5-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a nominal output voltage of 1.2V with a guaranteed maximum output 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 and low output noise of 60µVrms from 10Hz to 100kHz. The device incorporates an enable pin for shutdown control and includes built-in short-circuit protection and thermal shutdown. It utilizes the SOT-25-5 surface-mount package and supports an operating ambient temperature range from -40°C to +85°C.

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

• Integrated N-channel auto-discharge circuit that actively pulls the output voltage to ground when the enable signal is deactivated.
• High ripple rejection capability combined with ultra-low output noise suitable for sensitive RF and communication circuits.
• Built-in overcurrent and thermal protection mechanisms ensure device reliability under fault conditions.

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

• RF power supplies
• Portable video devices
• Wireless adapters

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

Verify the specific suffix 'D' indicates the inclusion of the internal discharge resistor, distinguishing it from non-discharge variants. Confirm the 'W5' suffix corresponds to the SOT-25-5 package type required for your PCB layout. Ensure the ordering code matches the exact 1.2V fixed output specification. Cross-reference the manufacturer's latest datasheet revision to confirm compliance with current RoHS and environmental standards before finalizing procurement.

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

Select this component when a compact footprint is required alongside precise voltage regulation for low-noise applications. The integrated discharge feature simplifies system power sequencing by ensuring rapid output voltage decay upon shutdown. Consider the thermal resistance characteristics of the SOT-25 package when designing for high ambient temperatures or continuous full-load operation to maintain junction temperature within safe limits.

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

This part belongs to the AP7343 family of CMOS low-dropout regulators designed for handheld and portable equipment. The series offers various fixed output voltages ranging from 0.9V to 3.6V. The 'D' variant specifically adds the auto-discharge functionality, while the 'W5' designation identifies the small-outline transistor package style used in space-constrained designs.

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

AP7343-12W5-7

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 internal N-channel auto-discharge resistor connected between the output and ground, which actively discharges the output capacitor when the device is disabled.

How does the enable pin operate?

The enable pin controls the state of the regulator; driving it high turns the device on, while pulling it low activates the shutdown mode and engages the auto-discharge feature if present.