AP22652/AP22653/AP22652A/AP22653A

Document number: DS41186 Rev. 3 - 2

9 of 16

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September 2021

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AP22652/AP22653/AP22652A/AP22653A

Application Information

The AP22652/52A and AP22653/53A are integrated high-side power switches optimized for Universal Serial Bus (USB) that require protection

functions. The power switches are equipped with a driver that controls the gate voltage and incorporates slew-rate limitation. This, along with the

various protection features and special functions, makes these power switches ideal for hot-swap or hot-plug applications.

Protection Features

Undervoltage Lockout (UVLO)

Whenever the input voltage falls below UVLO threshold (~2.5V), the power switch is turned off. This facilitates the design of hot-insertion systems

where it is not possible to turn off the power switch before input power is removed.

Overcurrent and Short-Circuit Protection

An internal sensing FET is employed to check for overcurrent conditions. Unlike current-sense resistors, sense FETs do not increase the series

resistance of the current path. When an overcurrent condition is detected, AP22652 and AP22653 maintain a constant output current and reduce

the output voltage accordingly. Complete shutdown occurs only if the fault stays long enough to activate thermal limiting.

For AP22652A/53A, when an overcurrent condition is detected, the devices will limit the current until the overload condition is removed or the

internal deglitch time (6ms typical) is reached, and AP22652A/53A will be turned off. AP22652A/53A will remain latched off until power is cycled or

the device enable is toggled.

The different overload conditions and the corresponding response of the AP22652/52A and AP22653/53A are outlined below:

NO.

Conditions

Explanation

Behavior of the AP22652 and AP22653

1

Short-circuit condition at

start-up

Output is shorted before input

voltage is applied or before the

part is enabled.

The IC senses the short circuit and immediately clamps output

current to a certain safe level namely ISHORT.

2

Short-circuit or overcurrent

condition

Short-Circuit or Overload

condition that occurs when the

part is enabled.

•

At the instance the overload occurs, higher current may flow

for a very short period of time before the current limit function

can react.

•

After the current limit function has tripped (reached the over-

current trip threshold), the device switches into current limiting

mode and the current is clamped at ISHORT/ILIMIT.

3

Gradual increase from

nominal operating current to

ILIMIT

Load increases gradually until the

current-limit threshold. (ITRIG)

The current rises until ILIMIT or thermal limit. Once the threshold

has been reached, the device switches into its current limiting

mode and is set at ILIMIT.

NO.

Conditions

Explanation

Behavior of the AP22652A/53A

1

Short-circuit condition at

start-up

Output is shorted before input

voltage is applied or before the

part is enabled

The IC senses the short circuit and immediately clamps output

current to a certain safe level namely ISHORT. When the internal

deglitch time (6ms typical) is reached and the devices will be

turned off.

2

Short-circuit or overcurrent

condition

Short-Circuit or Overload

condition that occurs when the

part is enabled.

•

At the instance the overload occurs, higher current may flow

for a very short period of time before the current limit function

can react.

•

After the current limit function has tripped (reached the over-

current trip threshold), the device switches into current limiting

mode and the current is clamped at ISHORT/ILIMIT. When the

internal deglitch time (6ms typical) is reached and the devices

will be turned off.

3

Gradual increase from

nominal operating current to

ILIMIT

Load increases gradually until the

current-limit threshold.(ITRIG)

The current rises until ILIMIT or thermal limit. Once the threshold

has been reached, the device switches into its current limiting

mode and is set at ILIMIT. When the internal deglitch time (6ms

typical) is reached and the devices will be turned off.