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Texas Instruments BQ24159YFFT — Power Management (PMIC / Gate Driver)

TI BQ24159YFFT Li-Ion Battery Charger IC, 1.55A Max

MPNBQ24159YFFT
Active

Texas Instruments BQ24159YFFT, single-cell Li-Ion/Li-Polymer battery charger IC, I²C interface, 1.55A max charge current, 4.44V max battery voltage, over-voltage and over-temperature protection, -30°C to 85°C, 20-DSBGA package.

$7.0200Ref. price · indicative, final on quote
Texas Instruments BQ24159YFFT datasheet (PDF)
Packaging20-UFBGA, DSBGA
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

BQ24159YFFT specifications
ParameterValue
MountingSurface Mount
Battery pack voltage4.44V (Max)
Voltage9V
Current - chargingConstant - Programmable
Charge current - max1.55A
InterfaceI²C
Operating temperature-30°C~85°C(TA)
PackageTape & Reel (TR); Cut Tape (CT)
Case20-UFBGA, DSBGA
Number of cells1
Fault protectionOver Temperature, Over Voltage
Battery chemistryLithium Ion/Polymer
Programmable featuresCurrent, Timer

Product details

This part includes built-in over-voltage and over-temperature protection, which matters when the charger sits in a sealed portable device where a runaway cell is a fire risk.

1.55A charge current — sizing the power path

The 1.55A max charge current sets the charge time for a single-cell pack. That current also drives the thermal design: The charge current is programmable via I²C, which lets firmware trade off charge speed against thermal budget. A timer-based safety cut-off backs up the host if communication is lost.

The ROHS3 compliance covers EU regulatory requirements for solder processes.

Frequently asked questions

What is the charge current for BQ24159YFFT?

The maximum charge current is 1.55A, and it is programmable via the I²C interface. The actual charge current set in firmware depends on the thermal design of the PCB and the battery cell's own current rating.

Is BQ24159YFFT compatible with a single-cell Li-ion battery?

Yes, it is designed for single-cell Li-Ion and Li-Polymer batteries. The maximum battery voltage is 4.44V, which covers the standard 4.2V termination voltage with headroom for high-voltage Li-ion cells.

Does BQ24159YFFT have overvoltage protection?

Yes, it includes both over-voltage and over-temperature protection as built-in fault safeguards. Over-voltage protection prevents the charger from exceeding the safe cell voltage, and over-temperature protection reduces current or shuts down the charger if the die gets too hot.