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Texas Instruments BQ24055DSST — Power Management (PMIC / Gate Driver)
Texas Instruments

BQ24055DSST USB Li-Ion Charger IC, 800 mA, 12-WSON

MPNBQ24055DSST
Obsolete

Texas Instruments BQ24055DSST single-cell Li-Ion/Polymer linear battery charger, USB interface, 800 mA max charge current, 4.2 V battery voltage, 28 V max supply, 12-WSON (2x3) package.

$1.6900Ref. price · indicative, final on quote
BQ24055DSST datasheet
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
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Specifications

BQ24055DSST Technical Specifications
ParameterValue
Mounting typeSurface Mount
Battery pack voltage4.2V
Voltage28V
Current - chargingConstant - Programmable
Charge current - max800mA
InterfaceUSB
Operating temperature0°C~125°C(TJ)
PackageTape & Reel (TR); Cut Tape (CT)
Case12-WFDFN Exposed Pad
Number of cells1
Fault protectionOver Temperature, Over Voltage, Short Circuit
Battery chemistryLithium Ion/Polymer
Programmable featuresCurrent

Product details

Single-cell USB charger in a 2x3 mm WSON

The Texas Instruments BQ24055DSST is a linear single-cell Li-Ion/Polymer charger IC designed for USB-powered portable devices. It charges a 4.2 V battery pack at a programmable constant current up to 800 mA, with the input supply rated to 28 V maximum. The 12-WSON (2x3 mm) package with exposed pad provides a thermal path through the pad to the PCB copper.

Charge current and protection — what sets the BOM

The 800 mA maximum charge current is set with a single programming resistor, giving the BOM engineer control over the charge rate without a separate current-sense resistor. The constant-current phase is programmable; the termination voltage is fixed at 4.2 V for standard single-cell Li-Ion and Li-Polymer packs. On-chip fault protection covers over-temperature, over-voltage, and short-circuit conditions — these reduce the external component count compared to a charger that requires a separate supervisor IC or thermistor network.

The BQ24055DSST is listed as Obsolete by Texas Instruments.

Frequently asked questions

What is the maximum charge current of BQ24055DSST?

The maximum charge current is 800 mA, programmable with a single resistor. The constant-current phase is adjustable below that ceiling.

Can BQ24055DSST charge a 4.2 V battery?

Yes, the battery pack voltage is fixed at 4.2 V, matching standard single-cell Li-Ion and Li-Polymer termination voltage.