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Texas Instruments BQ24038RHLR — Power Management (PMIC / Gate Driver)
Texas Instruments

BQ24038RHLR Li-Ion Battery Charger IC, 1.5A, bqTINY III

MPNBQ24038RHLR
Active

Texas Instruments bqTINY™ III series, BQ24038RHLR, single-cell Li-Ion/Polymer linear charger IC, max charge current 1.5A, programmable via external resistor, USB interface, 20-VFQFN exposed pad package, active production.

$2.4945Ref. price · indicative, final on quote
BQ24038RHLR datasheet
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
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Specifications

BQ24038RHLR Technical Specifications
ParameterValue
SeriesbqTINY™ III
Mounting typeSurface Mount
Battery pack voltage4.36V
Voltage16V
Current - chargingConstant - Programmable
Charge current - max1.5A
InterfaceUSB
Operating temperature-40°C~125°C(TJ)
PackageTape & Reel (TR); Cut Tape (CT)
Case20-VFQFN Exposed Pad
Number of cells1
Fault protectionOver Temperature, Reverse Current, Short Circuit
Battery chemistryLithium Ion/Polymer
Programmable featuresCurrent, Timer

Product details

Single-cell Li-Ion charger with 1.5 A ceiling

The Texas Instruments BQ24038RHLR is a single-cell Li-Ion/Polymer linear charger IC from the bqTINY™ III family, designed for USB-powered portable equipment. It delivers a programmable constant charge current up to 1.5 A and targets a battery pack voltage of 4.36 V — slightly above the standard 4.2 V termination, which suits high-voltage Li-Ion cells.

Protection set and programmability

Fault protection includes over-temperature, reverse current, and short circuit — covering the main failure modes in a single-cell charging path. The charge current and safety timer are programmable via external components, letting the designer tailor the charge profile to a specific battery capacity.

Supply voltage range and USB compatibility

The charger accepts a supply voltage up to 16 V, which covers USB 5 V bus, 9 V wall adapters, and unregulated 12 V rails without external pre-regulation. The USB interface input simplifies connection to standard USB ports or dedicated charging adapters.

Frequently asked questions

What resistor value sets the charge current on BQ24038RHLR?

The charge current is set by an external resistor connected to the ISET pin. The typical formula is I_CHG (A) = V_ISET / R_ISET, where V_ISET is nominally 2.5 V. For a 1.5 A charge current, a 1.67 kΩ resistor is used.

Is BQ24038RHLR compatible with 4.2V Li-Po batteries?

Yes — the battery pack voltage is 4.36 V, which is above 4.2 V. The charger will terminate at 4.36 V, so a 4.2 V battery would be overcharged. For 4.2 V cells, use a variant with a 4.2 V termination voltage, such as the BQ24038RHL (base product number BQ24038).