AP7351D-185W5-7

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

The AP7351D-185W5-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated. It provides a nominal output voltage of 1.85 V with a maximum guaranteed output current of 150 mA. The device operates within an input voltage range of 1.4 V to 5.5 V and features ultra-low quiescent current, typically 0.5 µA, and standby current of 0.02 µA. Ripple rejection reaches 60 dB at 1 kHz. It utilizes an SOT-25 package and supports an operating ambient temperature from -40°C to +85°C.

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

• Ultra-low quiescent and standby currents extend battery life in portable applications
• Integrated enable pin allows for precise power management and shutdown control
• High ripple rejection ratio ensures clean power delivery for sensitive subsystems
• Built-in active output discharge ensures the system starts from a known state

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

• Wearable electronics
• Sensor modules for Internet-of-Things (IoT)
• Wireless communication modules
• Camera and image sensor circuits

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

Verify that the specific part number suffix matches the required package type and output voltage configuration. Confirm compliance with RoHS directives and halogen-free requirements if mandated by project specifications. Ensure the supply chain source is authorized to guarantee component authenticity and traceability throughout the manufacturing lifecycle.

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

Select this component when designing low-power systems requiring a stable 1.85 V rail. The wide input voltage range accommodates single-cell lithium batteries. Verify that the load current does not exceed the 150 mA limit and that thermal dissipation remains within the specified junction temperature constraints for the chosen PCB layout.

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

This device belongs to the AP7351D series of low dropout regulators designed for handheld and wearable devices. The series offers various fixed output voltages and packages, including X2-DFN1010-4 and SOT-25. The AP7351D integrates a voltage reference, error amplifier, and current limit circuit to provide high accuracy and protection against short circuits and thermal overload.

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

AP7351D-18W5-7

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

How is the regulator turned off?

The regulator is turned off by pulling the Enable (EN) pin low. If the EN pin is left floating, the device may not operate correctly; it must be driven high or low.

What is the purpose of the active output discharge?

The active output discharge feature ensures that the output voltage drops rapidly when the device is disabled, allowing the system to start from a known state upon re-enablement.