AP22950

Document number: DS47157 Rev. 2 - 2

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May 2025

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AP22950

Application Information

Enable/Disable Control

The ENb pin controls the state of the power switch. Logic-high on ENb disables AP22950 and the AP22950 is enabled when the ENb pin is asserted

low. The built-

in 1MΩ pulldown resistor on ENb pin ensures AP22950 stays in conduction mode even if entire system is in a dead battery or depleted

battery condition. A 15ms debounce timer filters out glitch on control signal that prevent from fault enable.

Input/Output Capacitor

The AP22950 has a built-in circuit for surge protection. This circuitry requires an external 22µF capacitor on VBUS pin for 110V surge protection

and 100V surge protection is achievable without 22µF capacitor. Minimum 1µF capacitor is required and placed as close as possible to the VBUS

pin and GND to minimize parasitic effect. Minimum 1µF capacitor on VINT pin is required.

Undervoltage Lockout

When ENb is low and VBUS < VUVLO, the undervoltage lockout (UVLO) detection circuits disable the AP22950. Once VBUS exceeds VUVLO and

there is no other protection circuit is triggered, the AP22950 is controlled by the ENb pin.

Overvoltage Lockout

When ENb is low and VBUS > VOVLO_DEF_RISING (If OVLO = GND or < 0.1V) or OVLO > OVLOTH, the overvoltage lockout (OVLO) circuit disables

the AP22950 and ACKb asserts Hi-Z state. Once VBUS < VOVLO_DEF_RISING (If OVLO = GND or < 0.1V) or OVLO < VOVLOTH and no other protection

circuit is triggered, the AP22950 resumes normal operation.

The OVLO pin is used to configure the overvoltage threshold. The default overvoltage threshold is 23V when OVLO pin shorts to GND (OVLO <

0.1V). Connecting a resistor divider to the OVLO pin adjusts the overvoltage threshold from 4V to 23V using the equation below.

AP22950

VBUS

OVLO

GND

R1

R2

VBUS

Figure 5. OVLO External Resistor Configuration

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Note:

VOVLO_TH (typ) = 1.227V

R1 is recommended to use minimum 1M

Ω.

Overtemperature Protection

When EN is low and the device temperature reaches TSD (typ +150°C), the overtemperature protection (OTP) circuit disables the AP22950 and

asserts the ACKb output Hi-Z. Once the device temperature decreases below TSD - TSD_HYS (120°C = 150°C - 30°C) and no other protection circuit

is active, the AP22950 returns back to normal operation being controlled by the ENb pin status.

Acknowledge Flag Output (ACKb)

The ACKb output is an open-drain output that requires an external pullup resistor. The ACKb pin indicates the state of the power switch. When no

fault condition is triggered and power switch is conducting, ACKb asserts output low; otherwise it stays Hi-Z state. 10k

Ω to 200kΩ of external pullup

resistor is recommended.