AP7372

Document number: DS46597 Rev. 3 - 2

11 of 15

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May 2025

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AP7372

Application Information

Output Capacitor

An output capacitor is required for the stability of the LDO. The recommended minimum output capacitance is 2.2

μF. A ceramic capacitor is

recommended, and temperature characteristics are X7R or X5R. Higher capacitance values help to improve load/line transient response. The output

capacitance may be increased to keep low undershoot/overshoot. Place the output capacitor as close as possible to VOUT and GND pins.

Input Capacitor

A 2.2

μF ceramic capacitor is recommended to connect VIN and GND pins to decouple input power supply glitch and noise. The amount of the

capacitance may be increased without limit. This input capacitor must be located as close as possible to the device to ensure input stability and less

noise. For PCB layout, a wide copper trace is required for both VIN and GND.

Current-Limit and Short-Circuit Protection

When output current at VOUT pin is higher than the current-limit threshold or the VOUT pin directly shorts to GND, current-limit protection will be

triggered and clamp the output current at a pre-designed level to prevent overcurrent and thermal damage.

Soft-Start

The AP7372 uses an internal soft-start (SS pin open) to limit the inrush current when the output is enabled. The startup time for the 5V option is

approximately 34

0μs from the time the EN active threshold is crossed to when the output reaches 90% of the final value.

An external capacitor connected to the SS pin determines the soft-start time. This SS pin can be left open for a typical 340

μs startup time. Do not

ground this pin. When an external soft-start capacitor (CSS) is used, the soft-start time is determined by the following equation:

Where: tSTART-UP at 0pF is the startup time at CSS = 0pF (typically 340μs).

CSS is the soft-start capacitor (F).

ISS is the soft start current (typically 1μA).