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Texas Instruments BQ2057DGKR — Power Management (PMIC / Gate Driver)

BQ2057DGKR Li-Ion/Li-Po Charger IC, 4.1V, Obsolete

MPNBQ2057DGKR
Obsolete

Texas Instruments BQ2057DGKR, single-cell Li-Ion/Li-Po linear charger IC, 4.1V battery pack voltage, programmable charge current, 8-VSSOP package, -20°C to 70°C operating range.

$2.3100Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

BQ2057DGKR specifications
ParameterValue
MountingSurface Mount
Battery pack voltage4.1V
Supply voltage15V
Current - chargingConstant - Programmable
Operating temperature-20°C~70°C(TA)
PackageTape & Reel (TR); Cut Tape (CT)
Case8-TSSOP, 8-MSOP (0.118\", 3.00mm Width)
Number of cells1
Battery chemistryLithium Ion/Polymer
Programmable featuresCurrent

Product details

Single-cell Li-Ion charger — 4.1V termination, now obsolete

The Texas Instruments BQ2057DGKR is a linear single-cell charger IC for Lithium Ion/Polymer packs, terminating at 4.1V. Charge current is constant and programmable via an external resistor — no I²C or SMBus interface, just a resistor to set the rate.

What the specs mean for your BOM

The 4.1V termination voltage is the key fit check: if your design charges 4.2V cells, this part undercharges them to roughly 95% capacity. For 4.1V-rated cells (common in older Li-Ion chemistries and some Li-Po packs), it is a direct match. Operating temperature spans -20°C to 70°C — fine for consumer portable gear, indoor chargers, and handheld instruments. The supply input can go up to 15V, giving headroom for 5V USB or 9V wall-adapter inputs.

Sourcing an obsolete part

No factory lead-time applies — this is a last-time-buy / surplus procurement path.

Frequently asked questions

Where can I buy the BQ2057DGKR?

The BQ2057DGKR is obsolete but available through independent distribution.

What is the replacement for BQ2057DGKR?

Texas Instruments has not published an official replacement for this specific order code. Designs needing a 4.1V single-cell Li-Ion charger should evaluate the BQ24040 or BQ24232 families, but verify pinout and programming method — they are not direct pin-to-pin drop-ins.

Is the BQ2057DGKR compatible with 4.2V cells?

No — the battery pack voltage is fixed at 4.1V. Charging a 4.2V cell to 4.1V leaves about 5% capacity unused. For full 4.2V termination, select a charger IC rated for that voltage.