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A Closer Look at USB Power Delivery Support on the Xiaomi Mi 45W USB Type-C Power Adapter

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Xiaomi has been highly effective at bringing down electronics prices for consumers so it's great to see Xiaomi supporting USB Power Delivery 2.0 with the Mi 45W USB Type-C Power Adapter. Originally shipped with the Mi Notebook Air 13.3", the Mi 45W USB Type-C Power Adapter  can also be used with many other popular notebook PC's, tablets, mobile phones, game consoles, and action cameras that support charging over the USB Type-C connector.

The Mi 45W USB Type-C Power Adapter is a very compact and portable wall charger supporting USB Power Delivery 2.0 charging up to 45 watts through USB Type-C. 

With a max 45 watts output, the Mi 45W USB Type-C Power Adapter can be used to rapidly charge your notebook PC such as the Mi Notebook Air 13.3", Surface Book 2 or MacBook (Early 2015). You can also use the charger with the iPhone XGoogle Pixel or Samsung Galaxy S8, and 10.5-inch iPad Pro for a quick charge but of course they won't use the full 45 watts. Note you will need to use a Apple USB-C to Lightning Cable to charge an iPhone or iPad.

Opening up the Mi 45W USB Type-C Power Adapter packaging, we can take a good look at the charger and its accessories.

The Mi 45W USB Type-C Power Adapter itself has foldable AC prongs and most conveniently comes with a USB Type-C to USB Type-C cable. The charger supports the common 100 to 240 V AC power requirement for own charging as well as supplying the most popular DC charging voltage levels - 5V, 9V, 12V, 15V, and 20V.

The Mi 45W USB Type-C Power Adapter comes with a single USB Type-C port that supports USB Power Delivery 2.0 that outputs up to 45 watts with these power profiles: 15 watts (5 volts @ 3 amps), 27 watts (9 volts @ 3 amps), 36 watts (12 volts @ 3 amps), 45 watts (15 volts @ 3 amps), and 45 watts (20 volts @ 2.25 amps). 

Using the USB Power Delivery Compliance C2 Tester from Granite River Labs to run just a subset of the full USB Power Delivery compliance test suite, we are able to do a quick check of the 5 PDO's that the Mi 45W USB Type-C Power Adapter supports for charging- 15 watts (5 volts @ 3 amps), 27 watts (9 volts @ 3 amps), 36 watts (12 volts @ 3 amps), 45 watts (15 volts @ 3 amps), and 45 watts (20 volts @ 2.25 amps). Note some compliance failures were observed.

GRL

DUT Information

Manufacturer

Xiaomi

Model Number

45W PD AC Adapter

Serial Number

Comm

Test Information

Date and Time:

20180226_021631

Controller and Instrument Information

Parameter

Value

GRL USB-PD_C2 Serial No.

039.019.039.027.062.

GRL USB-PD Software Version

1.3.3.8

GRL USB-PD Firmware Version

1.3.3.0.7

Board Calibration

Calibration Success.

App Mode

COMMUNICATION_ENGINE_TESTS

Tx Mask

true

Rx Mask

false

RX mask Power selection

Neutral Power

Device Type

Provider Only

Cable IR drop Imp(R)

0

Product Capabilities

Parameter

GetCapabilities

UUT_Device_Type

 

Vendor_Name

 

Product_Name

 

Version_Info

 

TID

 

Type_C

NONE

SOP_Capable

NONE

SOP_P_Capable

NONE

SOP_PP_Capable

NONE

SOP_P_Debug_Capable

NONE

SOP_PP_Debug_Capable

NONE

Manufacturer_Info_Supported_Port

 

Manufacturer_Info_VID_Port

 

Manufacturer_Info_PID_Port

 

USB_Comms_Capable

NO

DR_Swap_To_DFP_Supported

NO

DR_Swap_To_UFP_Supported

NO

Externally_Powered

YES

VCONN_Swap_To_On_Supported

NONE

VCONN_Swap_To_Off_Supported

NONE

Responds_To_Discov

NONE

Attempts_Discov

NONE

Chunking_Implemented_SOP

NO

Unchunked_Extended_Messages_Supported

NO

Accepts_PR_Swap_As_Src

NO

Accepts_PR_Swap_As_Snk

NO

Requests_PR_Swap_As_Src

NONE

Requests_PR_Swap_As_Snk

NONE

XID

 

Structured_VDM_Version

 

Data_Capable_as_USB_Host

NONE

Data_Capable_as_USB_Device

NONE

Product_Type_UFP_SOP

 

Product_Type_DFP_SOP

 

Modal_Operation_Supported

NONE

Security_Msgs_Supported_SOP

NO

USB_VID

 

PID

 

bcdDevice

 

SVIDs Min

0

SVIDs Max

0

SVID Fixed

NONE

Power Capabilities

Parameter

GetCapabilities

PD_Power_as_Sink

 

No_USB_Suspend_May_Be_Set

NONE

GiveBack_May_Be_Set

NONE

Higher_Capability_Set

NONE

Num_Snk_PDOs

 

PD_Power_as_Source

 

Rp Value

 

USB Suspend may be cleared

NO

Send Ping

NONE

No of Source PDOs

 

Supply Type #1

Fixed

Peak Current #1

0x0(A)

Voltage #1

0x64(5V)

Max Current #1

0x12C(3A)

Supply Type #2

Fixed

Peak Current #2

0x0(A)

Voltage #2

0xB4(9V)

Max Current #2

0x12C(3A)

Supply Type #3

Fixed

Peak Current #3

0x0(A)

Voltage #3

0xF0(12V)

Max Current #3

0x12C(3A)

Supply Type #4

Fixed

Peak Current #4

0x0(A)

Voltage #4

0x12C(15V)

Max Current #4

0x12C(3A)

Supply Type #5

Fixed

Peak Current #5

0x0(A)

Voltage #5

0x190(20V)

Max Current #5

0xE1(2.25A)

PD_Power_as_Sink

 

No_USB_Suspend_May_Be_Set

NONE

GiveBack_May_Be_Set

NONE

Higher_Capability_Set

NONE

Num_Snk_PDOs

 

Result Summary

Sl No

Test ID

Test Name

Test Result

1

TDA.2.1.1.1

BMC-PHY-TX-EYE

PASS

2

TDA.2.1.1.2

BMC-PHY-TX-BIT

PASS

3

TDA.2.1.2.2

BMC-PHY-RX-INT-REJ

PASS

4

TDA.2.1.2.1

BMC-PHY-RX-BUSIDL

FAIL

7

TDA.2.2.1

BMC-PROT-SEQ-GETCAPS

PASS

11

TDA.2.2.7

BMC-PROT-BIST-NOT-5V-SRC

PASS

13

TDA.2.3.1.1

POW_SRC_LOAD_P_PC

FAIL

14

TDA.2.3.2.1

POW_SRC_TRANS_P_PC

PASS

15

TDB.2.2.9

BMC-PROT-GSC-REC

FAIL

BMC Eye Diagram


Eye Diagram

We can further observe that the Mi 45W USB Type-C Power Adapter supports charging at different voltages and current levels in the load screenshot below taken from the GRL-USB-PD C2 Compliance Test Solution App.

If you need a USB Power Delivery based charger to keep most of your smaller notebook PC's, tablets, and phones charged over USB Type-C, the Mi 45W USB Type-C Power Adapter would fit well which is also travel friendly. If you need a Xiaomi charger that supports Qualcomm Quick Charge 3.0 technology for Xiaomi phones, you can also consider the Mi 18W QC 3.0 Charger.

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