1 General description

The NX20P3483AUK is a product with combined multiple power switches and an LDO for USB PD application.

The device includes a bidirectional high voltage power switch which supports both 20V sink and 6V source; a

5V power switch for source and a 100mA LDO provides power supply for dead battery operation.

The high voltage power switch has 29V DC tolerance, and is able to sink up to 5A at maximum of 20V and

source up to 3.4A at maximum of 6V. When it is configured as a high voltage sink switch, the path has

overvoltage protection and reverse current protection features. While it is configured as high voltage source

switch, the adjustable overcurrent limit circuit is integrated.

The 5V power switch has an adjustable overcurrent limit, ideal diode feature and short circuit protection. The

maximum current capability is 3.4A. It supports fast role swap for USB PD3.0 application.

A VBUS discharge circuit is integrated according to USB PD VBUS discharging requirement. To minimize

inrush current during normal startup, turn on slew rate control has been built in for all power switches. Over

temperature protection is also equipped to automatically isolate the switch terminals when the device is

overheated.

The device is controlled through an I2C-bus interface, allowing the host to configure switches and program

different specified parameters according to an I2C register map.

The NX20P3483AUK is offered with WLCSP42 package: 0.4mm pitch, 2.51 x 2.91 x 0.525mm, 0.4mm pitch.

2 Features and benefits

• Wide supply voltage range for VBUS from 2.8V to 20V

• System power supply V5V from 4.0V to 5.5V

• Chip power supply VDD from 2.7V to 5.5V

• VBUS to VCHG Switch

– 28mΩ (typical) ultra low ON resistance

– ISW maximum 5A continuous current

– Bidirectional operation: 20V sink switch from VBUS to VCHG with RCP and 6V source switch from VCHG to

VBUS with overcurrent limit

– Adjustable overcurrent limit for source configuration from 400mA to 3.4A by I2C-bus interface

• V5V to VBUS switch

– 38mΩ (typical) ultra low ON resistance

– ISW maximum 3.4A continuous current

– Adjustable overcurrent limit from 400mA to 3.4A by I2C-bus interface

• Integrated high voltage LDO with reverse voltage protection

• Built in slew rate control for all power switches for inrush current limit

• Supports 1MHz Fast Mode Plus I2C-bus interface and four different I2C slave addresses by ADDR pin

• Safety approvals

– UL 62368-1, file no. 20181009- E470128

– IEC 62368-1, file no. DK-77044-UL

• Protection circuitry

– Over-Temperature Protection

– Over-Voltage Protection

– Under-Voltage Lockout

– Reverse current protection

• Surge protection:

– IEC61000-4-5 exceeds ±95V on VBUS

– IEC61000-4-5 exceeds ±100V on VBUS with 4.7uF capacitor

• ESD protection

– IEC61000-4-2 contact discharge exceeds 8kV on VBUS

– IEC61000-4-2 air discharge exceeds 15kV on VBUS

– HBM ANSI/ESDA/JEDEC JS-001 Class 2 exceeds 2kV on all pins

– CDM ANSI/ESDA/JEDEC JS-002 exceeds 500V

• Operating ambient temperature -40°C to +85°C

3 Applications

• Notebook, Ultrabook and Desktop

• USB PD DFP, UFP and DRP

• Tablet and Smart phone