Active production — design-in ready
The ADP5061ACBZ-4-R7: This single-cell Li-Ion charger IC is available in a 20-WLCSP package (2x2.6 mm), supplied on tape and reel or cut tape for prototyping runs.
Charge current and interface — what they mean for the BOM
The maximum charge current of 1.3 A is programmable via the I²C interface, which lets firmware set the charge rate to match the battery cell capacity — a 1000 mAh cell charges at roughly 1C, while a smaller 500 mAh cell can be limited to 0.5C to avoid overheating. The I²C bus also provides access to status registers and fault flags, so the system host can monitor charge state, termination, and thermal regulation without extra GPIOs. USB compatibility means the charger can negotiate current limits per the USB BC1.2 spec or proprietary charging protocols, depending on the external USB controller and firmware stack.
Package and thermal — layout considerations
The 20-WLCSP (2x2.6 mm) package has a 0.4 mm ball pitch — the board house needs a fine-line PCB process to route signals out from under the BGA array without blind vias. Maximum supply voltage of 6.7 V means the part can run directly from a 5 V USB bus or a 5 V regulated rail, with margin for transients up to the abs-max rating.