AP7343D-285W5-7

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

The AP7343D-285W5-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated. It provides a nominal output voltage of 2.85 V with a guaranteed maximum output current of 300 mA. The device operates within an input voltage range of 1.7 V to 5.25 V and features a typical ripple rejection ratio of 75 dB at 1 kHz. Quiescent current is specified as low as 35 µA, while the output noise voltage is 60 µVrms across a 10 Hz to 100 kHz bandwidth. The component utilizes an SOT25-5 surface-mount package and includes an integrated enable pin for power control.

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

• Integrated CMOS architecture providing high output voltage accuracy and low on-resistance
• Built-in discharge feature ensures rapid output voltage decay when disabled
• Includes thermal shutdown and fold-back short-circuit protection circuits

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

• RF supply circuits in portable devices
• Power management for camera modules
• Portable video equipment
• Wireless communication adapters

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

Verify that the specific part number suffix 'D' corresponds to the version with the auto-discharge function, as standard versions lack this feature. Confirm the W5 packaging code matches the required SOT25 form factor. Ensure the ordering quantity aligns with the manufacturer's standard tape and reel specifications for this package type.

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

Select this component when a precise 2.85 V rail is required from a single-cell lithium battery or similar low-voltage source. The inclusion of the discharge resistor makes it suitable for applications requiring fast power-down sequences. Verify that the load transient requirements are met by the recommended external capacitor values to maintain stability.

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

This device belongs to the AP7343 family of high PSRR low-noise LDOs. The 'D' suffix distinguishes it from non-discharge variants, adding an internal N-channel transistor to pull the output to ground upon disable. The '285' indicates the fixed 2.85 V output setting, while 'W5' designates the five-pin SOT25 surface-mount package.

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

AP7343-285W5-7 (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 circuit, which actively pulls the output voltage to ground when the enable pin is low.

How does the enable pin operate?

The EN pin must be driven high to turn the regulator on and pulled low to enter shutdown mode; it must not be left floating during operation.