AW33201CSR datasheet(10/17 Pages) AWINIC

10 / 17 page

AW33201/AW33205/AW33209

Jan 2018 V1.3

www.awinic.com.cn

FUNCTIONAL DESCRIPTION

Device Operation

If the input voltage is between UVLO and OVP threshold, the internal charge pump begins to work after

debounce time, the gate of the nFET switch will be slowly charged high till the switch is fully on. If the input

voltage exceeds the OVP trip level, the switch will be turned off in about 100ns. If input voltage falls below UVLO

threshold, or over-temperature happens, the switch will also be turned off.

Over-Voltage Protection

If the input voltage exceeds the OVP rising trip level, the switch will be turned off in about 100ns. The switch will

remain off until VIN falls below the OVP falling trip level.

USB On-The-Go (OTG) Operation

If VIN = 0V and OUT is supplied by OTG voltage, the body diode of the load switch conducts current from OUT

to IN and the voltage drop from OUT to IN is approximately 0.7V. When VIN > VIN_UVLO, internal charge pump

begins to open the load switch after debounce time. After switch is fully on, current is supplied through switch

channel and the voltage drop from OUT to IN is minimum.

PCB LAYOUT CONSIDERATION

To make fully use of the performance of AW332XX, the guidelines below should be followed.

1. All the peripherals should be placed as close to the device as possible. Place the input capacitor CIN on the

top layer (same layer as the AW332XX) and close to IN pin, and place the output capacitor COUT on the top layer

(same layer as the AW332XX) and close to OUT pin.

2. IN pin routing passes through the external TVS firstly, and then connect AW332XX.

3. Red bold paths on figure 4 and 5 are power lines that will flow large current, please route them on PCB as

straight, wide and short as possible.

4. The power trace from USB connector to AW332XX may suffer from ESD event, keep other traces away from

it to minimize possible EMI and ESD coupling.

5. Use rounded corners on the power trace from USB connector to AW332XX to decrease EMI coupling.

AW33201CSR Datasheet(PDF) 10 Page - Shanghai awinic technology co.,ltd