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Texas Instruments BQ24172RGYT — Power Management (PMIC / Gate Driver)
Texas Instruments

BQ24172RGYT Li-Ion Charger IC, 4A, 1-3 Cells, 24-VQFN

MPNBQ24172RGYT
Active

Texas Instruments BQ24172RGYT, Li-Ion/Polymer battery charger IC, 1-3 cells, 4A max charge current, 17V max supply, -40 to 85°C, 24-VFQFN Exposed Pad, Surface Mount, Active.

$5.8300Ref. price · indicative, final on quote
BQ24172RGYT datasheet
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MOQ1 pcs
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Specifications

BQ24172RGYT Technical Specifications
ParameterValue
Mounting typeSurface Mount
Battery pack voltage2.1V
Voltage17V
Current - chargingConstant - Programmable
Charge current - max4A
Operating temperature-40°C~85°C(TA)
PackageTape & Reel (TR); Cut Tape (CT)
Case24-VFQFN Exposed Pad
Number of cells1 ~ 3
Fault protectionOver Current, Over Temperature, Over Voltage
Battery chemistryLithium Ion/Polymer
Programmable featuresCurrent

Product details

4 A charge current, 1–3 cell Li-ion charger in a 24-VQFN

The Texas Instruments BQ24172RGYT is a synchronous switch-mode Li-Ion and Li-Polymer battery charger IC that handles 1 to 3 series cells. Its 4 A maximum charge current suits medium-power portable equipment, power tools, and medical devices where charge time matters. The 17 V input ceiling allows it to run from common 12 V adapter rails or USB-C PD sources with headroom.

Programmable charge current and integrated fault protection

Charge current is constant and programmable via an external resistor — no I2C bus needed, which simplifies the BOM for designs that just need a set-and-forget charge profile. The IC integrates over-current, over-temperature, and over-voltage fault protection, reducing the need for discrete supervisory components around the battery path.

Frequently asked questions

Does BQ24172RGYT support 2-cell Li-ion batteries?

Yes. The BQ24172RGYT supports 1 to 3 series cells, so a 2-cell (7.4 V nominal) pack is within its operating range. The battery pack voltage is 2.1 V per cell, and the charger regulates the output accordingly.

What is the difference between BQ24172RGYT and BQ24172RGYR?

The BQ24172RGYT and BQ24172RGYR share the same base product number BQ24172 and identical electrical specifications. Both are surface-mount in the same 24-VFQFN Exposed Pad package.

How do I program the charge current for BQ24172RGYT?

The charge current is programmable via an external resistor connected to the ISET pin. The IC uses a constant-current charge algorithm — you set the resistor value per the formula in the datasheet to achieve the desired current up to the 4 A maximum.