Teardown of Lenovo 65W Mini GaN Charger (BG65)
Introduction
More than a year ago, ChargerLAB published a teardown video of Realme 50W mini superdart charger, which adopts a ultra-thin design. You can click the related article at the bottom to check that. And today, we've received a similar product launched by lenovo - the Lenovo 65W Mini GaN Charger. So let's go ahead and take it apart to see its internal comonents and structure.
Product Appearance
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601195887.png)
The product appearance and Lenovo are printed on the front of the box.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601195989.jpeg)
The four major selling points of the product and some specs info are printed on the back.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601200380.png)
It contains a manual, a cable and the charger itself.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601200321.jpeg)
The cable adopts the same silver-grey design as the charger, maintaining a consistent overall tone. The USB-C connector has the word "ThinkBook" on it.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601200697.jpeg)
Furthermore, the joint has been reinforced.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601200918.jpeg)
The USB-C male plug adopts a full PIN design.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601201015.jpeg)
The length of the cable is about 1.8m (5’ 10.92”).
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601201213.jpeg)
Our ChargerLAB POWER-Z KM003C shows it can support 20V5A PD, and the data transmission speed is limited to USB 2.0.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601201437.jpeg)
The charger features an ultra-thin design, with an overall silver-grey tone and fine texture matte treatment on the surface, with distinct edges and corners.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601201623.jpeg)
The ThinkBook is marked in the upper corner of the top surface.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601201865.jpeg)
All specs info are printed on the bottom.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601205170.jpeg)
Model is BG65. When the input is 100-130V~50/60Hz 1.8A, the maximum output is 20V3A 60W. When the input is 200-240V~50/60Hz 1.5A, the maximum output is 20V3.25A 65W.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601205148.jpeg)
The charger comes with a foldable two-prong plug, which can be hidden inside the charger when not in use, making it easy to carry.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601205198.jpeg)
And the plastic sheet inside the USB-C port is black.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601205138.jpeg)
The length of the charger is about 87mm (3.43 inches).
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601205110.jpeg)
The width is about 42mm (1.65 inches).
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601205167.jpeg)
And the height is about 13mm (0.51 inches).
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601205634.jpeg)
This is how it looks like on my hand.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601210011.jpeg)
The weight is about 72g (2.54 oz).
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601210260.jpeg)
And the total weight is about 126g (4.44 oz).
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601210483.jpeg)
The ChargerLAB POWER-Z KT002 shows the USB-C port supports Apple 2.4A, Samsung 5V2A, DCP, QC3.0, QC4+, PD3.0, and PPS protocols.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601210672.jpeg)
It also supports five fixed PDOs of 5V/9V/12V/15V 3A, 20V 3.25A, and a set of PPS.
Teardown
Next, let’s go ahead and take it apart.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601210868.jpeg)
Use a spudger to pry along the gap reveals that the PCB is covered with silicone adhesives for heat dissipation, and insulated with yellow tape.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601211090.jpeg)
And there is a layer of graphite thermal sheet blow it, which further evenly dissipates heat.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601211285.jpeg)
Clean up the adhesives, and the PCBA module has copper foil for shielding.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601211315.jpeg)
The copper foil is pasted on heat resistant tape for insulation and connected to the PCBA module.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601211558.jpeg)
There is another thermal sheet underneath the heat resistant tape.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601211768.jpeg)
Next, take out the PCBA module.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601211929.jpeg)
Yellow tape is also pasted inside the other case, and a graphite thermal sheet is under it.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601212178.jpeg)
The planar transformer is parallel soldered onto the PCBA module to increase space utilization.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601212312.jpeg)
So is the high-voltage filter capacitors.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601212538.jpeg)
The length of the PCBA is about 82mm (3.23 inches).
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601212820.jpeg)
The width is about 37mm (1.46 inches).
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601213029.jpeg)
And the height is about 9mm (0.35 inches).
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601213226.jpeg)
The high-voltage electrolytic capacitors, solid capacitor for output filtering and planar transformer are on the front of the PCBA module.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601213475.jpeg)
And the bridge rectifier, GaN controller, GaN power chip, SMD Y capacitor and feedback optocoupler are on the back.
ChargerLAB found that this charger adopts a QR flyback topology with a wide output voltage range. The output voltage is controlled by the protocol chip and regulated by optocoupler.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601213650.jpeg)
The time-delay fuse is from Lanbaofuse TB series. 3.15A 250V.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601213811.jpeg)
The common mode choke is wound with magnet wires and insulated wires.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601214071.jpeg)
The safety X2 capacitor is 0.1μF.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601214282.jpeg)
The bridge rectifier's model is TT8M. 8A 1000V.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601214487.jpeg)
Two high-voltage filter capacitors are from BERYL. 400V 47μF.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601214672.jpeg)
The differential mode choke is wound with magnet wires and fixed by adhesives.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601214989.jpeg)
The master control chip is from Kiwi Instruments, model KP2202, which is a high-frequency QR flyback PWM controller. The chip has built-in high-voltage start-up and X-capacitor discharge functions, and has the advantages of fast start-up capability and low standby power consumption. It also supports 500kHz switching frequency, power-saving mode, and standby power consumption is less than 30mW.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601215118.png)
Here is all the information about KP2202.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601215788.jpeg)
The filter capacitor that powers the master control chip is insulated with a heat-shrinkable tubing.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601215992.jpeg)
The highly integrated GaN power chip is from Navitas, model NV6136A, which has a built-in driver and a high-precision lossless current sampling circuit to eliminate the loss of the sampling resistor.
It supports a switching frequency of 2MHz and adopts a 6 x 8mm QFN package. 170mΩ 700V.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601220634.png)
Here is all the information about NV6136A.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601221258.jpeg)
The feedback optocoupler is soldered between the two SMD Y capacitors.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601221279.jpeg)
The SMD Y capacitor is from Anshan Keifat. It is a plastic-sealed Y1 capacitor with a specification of 331K.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601221529.jpeg)
And the CT1019 optocoupler is used for output voltage regulation.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601221787.jpeg)
The planar transformer is shielded with copper foil and insulated with heat resistant tape.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601222021.jpeg)
Next, remove the planar transformer.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601222170.jpeg)
The copper foil is grounded.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601222334.jpeg)
Tear it off.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601222526.jpeg)
The output end of the planar transformer is soldered with a synchronous rectifier controller and a synchronous rectifier MOSFET.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601222829.jpeg)
And there are 7 MLCC capacitors connected in parallel for output filtering on the back.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601223065.jpeg)
The synchronous rectifier controller is from Joulwatt, model JW7726B, it supports CCM, DCM, QR flyback and ACF active clamping, and has fast turn-off capability. During the start-up process (before VCC is established), it can effectively prevent the gate from being coupled to the turn-on voltage. At present, the cumulative shipment of JW7726 series products is close to 10 million pieces.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601223341.png)
Here is all the information about JW7726.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601224588.jpeg)
The synchronous rectifier MOSFET is from AOS and adopts DFN5 x 6 package. 100V 6.2mΩ. Model is AON6220.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601224794.jpeg)
Two solid capacitors for output filtering are both 330μF 25V.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601225041.jpeg)
The protocol chip is from Sonix, model SNPD1683, which is a highly integrated USB Type-C port controller that complies with the latest USB Type-C and PD standards. In fact, SNPD1683 has officially obtained Qualcomm QC5 certification, becoming one of the few QC5 fast charge certification protocol chips in the industry.
The SNPD1683 integrates an 8-bit 8051 processor, 16 KB flash memory, a complete Type-C USB-PD transceiver, and a built-in 5V voltage regulator circuit. It also supports 10mV precision adjustment of output voltage and NMOS/PMOS output control.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601225235.jpeg)
The output VBUS MOSFET is marked with P035.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601225429.jpeg)
The plastic sheets inside the USB-C socket is black.
![Teardown of Lenovo 65W Mini GaN Charger (BG65)-Chargerlab](https://www.chargerlab.com/wp-content/uploads/2023/05/2023052601231469-scaled.jpeg)
One last look at all the components of this Lenovo 65W Mini GaN Charger.
Summary of ChargerLAB
The Lenovo 65W Mini GaN Charger boasts an ultra-slim design that embodies portability, with a thickness of just 12.7mm facilitated by its foldable prongs and hollow structure. The charger's sole USB-C port supports both 65W PD fast charging output and 5-21V3A PPS fast charging, rendering it a highly practical device that caters to the fast charging demands of both smartphones and computers.
ChargerLAB discovered that the device integrates both a graphite thermal sheet and silicone adhesives to reinforce its heat dissipation properties. Internally, it features a Kiwi KP2202 GaN controller, paired with the Navitas NV6136A GaN power chip. A Joulwatt JW7726B synchronous rectifier controller is soldered onto the planar transformer. Moreover, it boasts two cylindrical capacitors in combination with the hollow design to reduce thickness, and with high-voltage filter capacitors from BERYL, the device exhibits a compact internal configuration.
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2. Teardown of Lenovo Legion 135W/C135 USB-C GaN Charger
3. WiFi6E Standard | Lenovo Launched ThinkBook Wireless Dock at CES2023