LP3921SQE/NOPB

Texas Instruments · Boomer® Series

Texas Instruments Boomer® series LP3921SQE/NOPB single-cell Li-Ion battery charger IC, 950mA max charge current, I²C interface, 32-WFQFN Exposed Pad package, -40°C to 85°C operating temperature.

Texas Instruments LP3921SQE/NOPB
Download datasheet (PDF)
[IN STOCK] In Stock: 82 pcs
$2.55/ pc

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MOQ 1 · Tape & Reel (TR); Cut Tape (CT) · RoHS · EIA-481 · DAP/DDP · T/T

Technical specifications

LP3921SQE/NOPB specifications
Parameter / AttributeSpecification / Value
SeriesBoomer®
MountingSurface Mount
Battery pack voltage4.2V
Supply voltage5.5V
Current - chargingConstant - Programmable
Charge current - max950mA
InterfaceI²C
Operating temperature-40°C ~ 85°C (TA)
PackageTape & Reel (TR); Cut Tape (CT)
Case32-WFQFN Exposed Pad
Number of cells1
Fault protectionOver Temperature, Reverse Current
Battery chemistryLithium Ion

Technical details

It communicates over an I²C interface, making it a good fit for portable devices where the host microcontroller manages the charging profile.

The 950 mA max charge current is programmable via the I²C bus, so you can dial it down for smaller cells or slow charging. That constant-current phase is the bulk of the charge cycle for a single Li-Ion cell at 4.2 V. The fault protection covers over-temperature and reverse current — handy if the battery is connected backwards or the charger sees a thermal event. The 5.5 V max supply voltage is typical for USB-powered or 5 V rail designs.

Package and mounting — field-swap reality

It is a 32-lead WFQFN with an exposed pad, surface-mount only. No lab, no bench — if you are swapping this on site, you need a hot-air station and a steady hand. The Tape & Reel or Cut Tape option covers both production and prototype volumes.

Lifecycle — no LTB risk

LP3921SQE/NOPB
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