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ben5049/Smart-Watch
This project aims to take a cheap, common smart watch and upgrade it by replacing the screen and all internal electronics with custom hardware.

Analog Devices
-40℃~+125℃@(TJ) 1 180nA 2.15V~6.5V 2MHz 50mA、500mA 800mV~5V Adjustable Buck Built-in Overcurrent Protection、Output discharge、Operating status indication、Cycle-by-cycle current limiting、Frequency synchronization Step-down type Yes WLCSP-9(1.6x1.9) DC-DC Converters ROHS
The ADP5301ACBZ-2-R7 is a DC DC Converter made by Analog Devices in a WLCSP-9(1.6x1.9) package with 9 pins. -40℃~+125℃@(TJ) 1 180nA 2.15V~6.5V 2MHz 50mA、500mA 800mV~5V Adjustable Buck Built-in Overcurrent Protection、Output discharge、Operating status indication、Cycle-by-cycle current limiting、Frequency synchronization Step-down type Yes WLCSP-9(1.6x1.9) DC-DC Converters ROHS.
PCBKit's library has its KiCad symbol (EasyEDA_Cloud:ADP5301ACBZ-4-R7, from EasyEDA) and its footprint (Package_CSP:WLCSP-9_1.21x1.22mm_Layout3x3_P0.4mm, from KiCad's library), ready for a KiCad board. JLCPCB lists it (part C659284). 1 open-source board in 1 repository on GitHub use it.
| Pin | Name | Type |
|---|---|---|
| A1 | SW | Unspecified |
| A2 | PVIN | Unspecified |
| A3 | EN | Unspecified |
| B1 | PGND | Unspecified |
| B2 | AGND | Unspecified |
| B3 | SYNC/MODE | Unspecified |
| C1 | VOUTOK | Unspecified |
| C2 | FB | Unspecified |
| C3 | VID | Unspecified |

ben5049/Smart-Watch
This project aims to take a cheap, common smart watch and upgrade it by replacing the screen and all internal electronics with custom hardware.
<iframe src="https://pcbkit.io/embed/parts/adi/ADP5301ACBZ-2-R7" title="ADP5301ACBZ-2-R7 in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe><img src="https://pcbkit.io/embed/parts/adi/ADP5301ACBZ-2-R7.jpg" alt="ADP5301ACBZ-2-R7" width="1200" height="900">[](https://pcbkit.io/parts/adi/ADP5301ACBZ-2-R7)Yes. The symbol is EasyEDA_Cloud:ADP5301ACBZ-4-R7 and the footprint Package_CSP:WLCSP-9_1.21x1.22mm_Layout3x3_P0.4mm, both drawn on this page. PCBKit places them on a board for you when you design with it.
WLCSP-9(1.6x1.9), with 9 pins. Its footprint is drawn on this page.
Analog Devices publishes it: the Datasheet link on this page opens it.
JLCPCB lists it as part C659284, with 0 in stock; the sellers' links on this page open their listings.
Parts like it in the library: the FAN48610UC50X by onsemi, the FAN48610BUC33X by onsemi, the FAN48611UC53X by onsemi and the FAN48618BUC53X by onsemi. Check their datasheets: a part that fits the footprint may still differ in its ratings.
1 board in 1 repository on GitHub; the most starred are listed on this page, with their KiCad files.