Charge current ceiling and I²C programmability
The BQ24157YFFT delivers a maximum charge current of 1.55 A for a single-cell Li-Ion or Li-Polymer stack. That 1.55 A is the constant-current ceiling — the actual charge rate is set via the I²C interface, so you can dial it down for smaller cells or thermal budget without swapping a sense resistor.
Battery termination and protection limits
The charger regulates the battery pack voltage to a maximum of 4.44 V — this is the termination ceiling for a standard 4.2 V Li-Ion cell with a small overvoltage allowance. On-chip fault protection covers over-temperature and over-voltage conditions, which means the IC can shut itself down without a supervisory watchdog.
Package, supply, and temperature range
Housed in a 20-ball DSBGA (20-DSBGA) package, the BQ24157YFFT is a true chip-scale footprint — the 0.4 mm ball pitch demands careful PCB layout and a solder mask defined pad. Supply voltage max is 6 V, which comfortably covers a 5 V USB input. The operating temperature range is -30°C to 85°C, suitable for consumer and industrial portable gear.
This part is sourced to order — we confirm current pricing and lead time against your BOM quantity at quote time.