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Texas Instruments BQ25628RYKR — Power Management (PMIC / Gate Driver)

BQ25628RYKR — TI I²C 1-Cell Li-Ion Charger, 18V Input

MPNBQ25628RYKR
Active

Texas Instruments BQ25628RYKR, I²C-controlled single-cell Li-Ion/Polymer linear charger, 18V max input, 2A max charge current, 18-PowerWFQFN (3x2.5 mm) package, -40°C to 85°C.

$4.1500Ref. price · indicative, final on quote
Texas Instruments BQ25628RYKR datasheet (PDF)
Packaging18-PowerWFQFN
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

BQ25628RYKR specifications
ParameterValue
MountingSurface Mount
Battery pack voltage4.8V (Max)
Supply voltage18V
Current - chargingConstant - Programmable
Charge current - max2A
InterfaceI²C
Operating temperature-40°C ~ 85°C (TA)
PackageTape & Reel (TR) Cut Tape (CT)
Case18-PowerWFQFN
Number of cells1
Fault protectionOver Current, Over Temperature, Over-Under Voltage, Short Circuit
Battery chemistryLithium Ion/Polymer
Programmable featuresCurrent, Timer, Voltage

Product details

The BQ25628RYKR accepts a maximum supply voltage of 18V, which covers USB-C PD at 15V and 12V wall adapters without an external front-end clamp. The 2A maximum charge current is the practical fast-charge ceiling for a single 1S Li-Ion or Li-Polymer cell in a handheld or portable device — above 2A the 3x2.5 mm QFN package thermal impedance (junction-to-ambient) becomes the limiting factor.

Fault protection and operating range

Built-in protection covers over-current, over-temperature, over-voltage, under-voltage, and short-circuit events.

Frequently asked questions

What is the difference between BQ25628RYKR and BQ25629RYKR?

The BQ25629RYKR is the closest sibling in the same family. The primary difference is the I²C register map — the BQ25628RYKR uses a different default charge voltage and timer configuration. Pin-compatible in the same 18-WQFN-HR (3x2.5) package, but the firmware register writes must match the variant. Check the TI datasheet for the register-level delta before swapping.

Does BQ25628RYKR support I²C programming?

Yes. The charge current, termination voltage, and safety timer are all programmable via the I²C interface. No external resistors are needed for the charge profile.

Is BQ25628RYKR suitable for a 1S battery pack?

Yes. It is designed for single-cell (1S) Lithium Ion/Polymer packs, with a maximum battery pack voltage of 4.8V — the standard 4.2V or 4.35V cell termination fits within that ceiling.