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Texas Instruments BQ2057DGKRG4 — Power Management (PMIC / Gate Driver)

BQ2057DGKRG4 Li-Ion/Polymer Charger IC, Obsolete, 4.1V

MPNBQ2057DGKRG4
Obsolete

Texas Instruments BQ2057DGKRG4 single-cell Li-Ion/Polymer linear charger IC, 4.1V battery pack voltage, programmable charge current, -20°C to 70°C, 8-TSSOP/MSOP package.

Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

BQ2057DGKRG4 specifications
ParameterValue
MountingSurface Mount
Battery pack voltage4.1V
Supply voltage15V
Current - chargingConstant - Programmable
Operating temperature-20°C~70°C(TA)
PackageTape & Reel (TR)
Case8-TSSOP, 8-MSOP (0.118\", 3.00mm Width)
Number of cells1
Battery chemistryLithium Ion/Polymer
Programmable featuresCurrent

Product details

Single-cell Li-Ion/Polymer linear charger — 4.1V regulation target

Charge current is programmable via an external sense resistor, making it adaptable to different cell capacities and charge-time targets. The device operates over -20°C to 70°C ambient, which covers handheld instruments, portable medical gear, and consumer electronics that stay indoors or in moderate outdoor conditions.

Texas Instruments has classified the BQ2057DGKRG4 as Obsolete. No last-time-buy window remains open from the factory. For BOM lines that still specify this order code, the only channel is the independent surplus market. No official replacement or pin-compatible successor is listed by TI; any alternate must be qualified against the original design's 4.1V regulation and 8-TSSOP footprint.

Package and mounting — 8-TSSOP/MSOP for tight layouts

Frequently asked questions

Where can I buy BQ2057DGKRG4 and get a price?

The BQ2057DGKRG4 is obsolete and no longer available from the factory. We source it through independent distribution channels. Submit an RFQ; we confirm availability and current pricing at the time of quote. No stock-holding claim is made — each order is sourced per request.

Is BQ2057DGKRG4 compatible with 4.2V Li-ion cells?

No. The BQ2057DGKRG4 regulates the battery pack voltage to a fixed 4.1V. Charging a 4.2V Li-ion cell to only 4.1V will leave it undercharged (roughly 80-85% capacity). For 4.2V cells, look for a charger IC with a 4.2V regulation setpoint.

What is the replacement for BQ2057DGKRG4?

Texas Instruments has not listed an official replacement or pin-compatible successor for the BQ2057DGKRG4. Any alternate must be qualified against the original design's 4.1V regulation voltage, programmable current feature, and 8-TSSOP/MSOP footprint. We can help identify candidate parts from the broader BQ2057 family or other TI charger ICs upon request.