AP22950

Document number: DS47157 Rev. 2 - 2

8 of 15

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May 2025

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AP22950

Application Information (continued)

Reverse Current Protection

The AP22950 monitors voltage difference between VBUS and VINT. Once VRCP_TRIG (typ 45mV) < VINT - VBUS < VFRCP_TRIG (typ 120mV), control

logic turn Q2 switch by internal reverse current protection circuit trigger after tRCP_DEGLITCH (typ 3.7ms) and the control logic turn Q2 switch off

immediately if VINT - VBUS > VFRCP_TRIG (120mV) by fast reverse current protection circuit.

Control Logic

VBUS

RCP

VINT

Q1

Q2

Figure 6. Power Switch Block

VBUS

VINT

Switch

behavior

VINT =

VBUS

VINT > VBUS

VINT =

VBUS - VF

VINT = VBUS

Turn on

(Q1:ON, 2:ON)

TRCB state(Q1:ON, Q2:Off)

VINT >

VBUS+VRCP_TRIG

Turn on

(Q1:ON, Q2:ON)

VINT <

VBUS+VRCP_TRIG

RCP Recovery

(Q1:ON, Q2:Off)

tRCP_RELEASE

Figure 7. Switch Behavior in RCP Operation

In the multi-port system application, while Q2 switch is off, VBUS is able to supply VINT whenever VINT becomes lower than VBUS through Q2

body diode path. This is to prevent a portable system from losing system power supply when the first high-voltage charger is plugged out while the

second high-voltage charger remains plugged in. System shall stay in operation mode upon any plugging in and out any port occurs as long as one

port has plugged-in charger.

VBUS_B

VINT

0V

0V

VBUS_A

0V

12V

20V

12V

20V

12V

12V Charger

Plug in

RCP is

triggered

20V charger is plugged out but system power(VINT) is

maintained by 12V power source. System can stay wake up.

9V – VF_Q2

20V Charger Plug in

20V Charger Plug out

Figure 8. VINT Power Transition in Multi-Ports System