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Texas Instruments BQ24745RHDTG4 — Power Management (PMIC / Gate Driver)

BQ24745RHDTG4 Battery Charger IC, 8.064A Max, I²C, 28-VQFN

MPNBQ24745RHDTG4
End of Life

Texas Instruments BQ24745RHDTG4, Multi-Chemistry Battery Charger IC, 2-4 Cells, 8.064A Max Charge Current, I²C Interface, 28-VQFN (5x5) Exposed Pad, -40°C to 125°C.

Texas Instruments BQ24745RHDTG4 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

BQ24745RHDTG4 specifications
ParameterValue
MountingSurface Mount
Battery pack voltage19.2V (Max)
Supply voltage24V
Current - chargingConstant - Programmable
Charge current - max8.064A
InterfaceI²C
Operating temperature-40°C~125°C(TJ)
PackageTape & Reel (TR)
Case28-VFQFN Exposed Pad
Number of cells2 ~ 4
Fault protectionOver Voltage
Battery chemistryMulti-Chemistry

Product details

8.064 A max charge current — sizing the power path

The BQ24745RHDTG4 is a multi-chemistry battery charger IC from Texas Instruments that handles 2 to 4 series cells with a programmable constant-current charge up to 8.064 A. That current ceiling is the main event for the power-stage design: the inductor, sense resistor, and input capacitor all need to be sized for that peak, not the average pack current. The I²C interface lets the host set the charge current, voltage thresholds, and input current limit, so the same BOM can serve different pack capacities by firmware alone.

28-VQFN exposed pad — thermal and rework note

The 28-VQFN (5x5 mm) package with exposed pad is the standard QFN footprint for a charger this size.

Frequently asked questions

What is the maximum charge current for BQ24745RHDTG4?

The maximum charge current is 8.064 A, programmable via the I²C interface. The actual current in a design is set by the sense resistor and the host command.

Is BQ24745RHDTG4 compatible with 4-cell lithium-ion batteries?

Yes, the part supports 2 to 4 series cells, which covers 4S Li-ion and LiPo packs. The maximum battery pack voltage is 19.2 V.

Can I use BQ24745RHDTG4 as a replacement for BQ24745RHDT?

The BQ24745RHDTG4 and BQ24745RHDT share the same base product number BQ24745 and the same 28-VQFN package. The 'G4' suffix typically indicates a lead-free / RoHS-compliant finish. They are functionally identical and pin-compatible, so the 'G4' variant is a direct drop-in replacement for the non-G4 version in most designs.