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Texas Instruments BQ24040DSQT — Power Management (PMIC / Gate Driver)

TI BQ24040DSQT Li-Ion Battery Charger IC, 1A, 10-WSON

MPNBQ24040DSQT
Active

Texas Instruments BQ24040DSQT, Li-Ion/Polymer battery charger IC, single-cell, 1A max charge current, 28V max supply, -40°C to 85°C, 10-WFDFN exposed pad, 10-WSON (2x2) package.

$1.7500Ref. price · indicative, final on quote
Texas Instruments BQ24040DSQT datasheet (PDF)
Packaging10-WFDFN Exposed Pad
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

BQ24040DSQT specifications
ParameterValue
MountingSurface Mount
Battery pack voltage4.2V
Voltage28V
Current - chargingConstant - Programmable
Charge current - max1A
Operating temperature-40°C~85°C(TA)
PackageTape & Reel (TR); Cut Tape (CT)
Case10-WFDFN Exposed Pad
Number of cells1
Fault protectionOver Temperature, Over Voltage, Short Circuit
Battery chemistryLithium Ion/Polymer
Programmable featuresCurrent

Product details

Single-cell Li-ion charger with 1A programmable current and 28V input tolerance

Built-in fault protection covers over-temperature, over-voltage, and short-circuit conditions — the chip handles the safety loop without external supervisory components. The operating temperature range of -40°C to 85°C covers industrial and outdoor charging applications, from portable instruments to handheld field tools.

Lifecycle and sourcing — active, no obsolescence concern

The BQ24040DSQT carries an active product status and is ROHS3 compliant. For BOM planning, this part is available through independent distribution and can be quoted to order — no LTB window to track, no forced last-time buy.

Frequently asked questions

What is the maximum charge current for BQ24040?

The maximum charge current is 1A, programmable via an external resistor. The actual current in a design depends on thermal conditions — the exposed pad must be well-sunk to sustain 1A at elevated ambient temperatures.

Is BQ24040DSQT compatible with 4.35V batteries?

No. The BQ24040DSQT terminates at a fixed 4.2V battery pack voltage. It is not compatible with 4.35V high-voltage Li-ion cells. For 4.35V termination, look at parts like the BQ24045 or BQ24075 series from TI.

What is the closest pin-compatible alternative to BQ24040DSQT?

Within the same BQ2404x family, the BQ24045DSQT is a near-pin-compatible variant that terminates at 4.35V instead of 4.2V. Verify the pinout against your layout — the charge-current programming and status pins are shared, but the termination voltage difference is the deciding factor.