Introduction

ChargerLAB got a Xiaomi 5000mAh ultra-thin power bank, as thin as 10mm. It has a USB-C port, supports PD 20W output power and 18W input power, and is also compatible with PPS and QC protocols. Next, let's take it apart to see its internal components and structure.

Product Appearance

The packaging box is black with the Xiaomi logo printed on the upper right corner.

The specs info is printed on the back.

Model is PB0520MI. Battery type: Lithium-ion battery; Rated energy: 19.1Wh 3.88V4900mAh; Typical energy: 19.4Wh 3.88V5000mAh; Input interface: U5B-C

Output interface: USB-C; Input parameters: 5V3A, 9V2A; Output parameters: 5V2.4A, 9V2.22A, 12V1.5A; Rated capacity: 2700mAh (5W/2.4A);

The box contains the Xiaomi 5000mAh ultra-thin power bank, a dual USB-C cable, and some documents.

The cable is made of flame-retardant PC.

The length of the cable is about 15.5 cm (6.1 inches).

ChargerLAB POWER-Z KM003C shows it doesn't have an e-marker chip.

The shell of the power bank is made of flame-retardant PC.

The Xiaomi logo is printed in the middle of the back, and the specs info is printed below.

There is an indicator light and switch on the left side.

The indicator light lights green.

The USB-C port has a black plastic sheet.

The length is about 112.91 mm (4.45 inches).

The width is about 53.11 mm (2.091 inches).

The thickness is about 10.14 mm (0.4 inches).

That's how big it is in the hand.

The weight is about 93.5 g (3.3 oz).

ChargerLAB POWER-Z KM003C shows the USB-C port can support QC3.0, QC4+, PD3.0, DCP, and PPS charging protocols.

And it has three fixed PDOs of 5V2.4A, 9V2.22A, 12V1.5A, and a set of PPS, which is 5-11V/2A.

Teardown

Next, let's take it apart to see its internal components and structure.

First, pry along the gap to open the cover.

There are foams for cushioning at the place where the cover contacts the battery cell.

The PCBA module is fixed with screws.

A thermistor is attached to the battery to measure temperature.

Remove the remaining case.

The battery cell is fixed with double-sided tapes.

There is a graphite sticker inside the shell for heat dissipation.

Tear off the sticker, the bottom layer is a composite material of graphite foam and copper foil.

The battery and PCBA module are connected by welding.

The battery is from LS. Nominal voltage 3.88V, nominal minimum capacity 4900mAh, maximum capacity 5000mAh, energy 19.02Wh, charging cut-off voltage 4.5V. Model is SP654588SL.

Disconnect the PCB and battery.

There is an NTC thermistor, an alloy inductor, a USB-C interface, a synchronous buck controller, a VBUS MOSFET, an MCU, a battery protection chip, and a battery protection MOSFET on the front of the PCBA module.

There are no main components on the back of the PCBA module.

The synchronous buck charger is from SouthChip. It is a synchronous buck charger with reverse boost discharging function. It integrates two N-channel MOSFETs and features an I2C interface. It adopts QFN4*4-32 package. Model is SC8934.

Here is the information about the SouthChip SC8934.

The edges of the alloy inductor are reinforced with glue. 2.2μH.

The MCU is from ABOV. It is used for input and output control, protocol identification, power display and protection functions, etc., and supports two USB-C interfaces and one USB-A interface application. It adopts 24QFN package. Model is A94P829LUN.

The VBUS MOSFET for the USB-C port is from JESTEK. It has a withstand voltage of 30V and adopts PDFN3.3X3.3 package. Model is JST3050.

The battery protection chip is marked with 8GA.

The battery protection MOSFET is marked with 6A 4998.

TVS diodes are used for overvoltage protection.

Well, those are all components of the Xiaomi 5000mAh Ultra-thin Power Bank.

Summary of ChargerLAB

Here is the component list of the Xiaomi 5000mAh Ultra-thin Power Bank for your convenience.

It has an ultra-thin design, is equipped with a USB-C port, supports an input power of 18W, and supports a maximum output power of 20W.

After taking it apart, we found it adopts a 5000mAh soft pack battery from LS, with a nominal voltage of 3.88V. It uses SouthChip SC8934 for fast charge output. The workmanship is solid.

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