BQ24045DSQR from Texas Instruments, in a WSON-10-EP(2x2). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	IN	power_in	Input power, connected to external DC supply (AC adapter or USB port). Expected range of bypass capacitors 1uF to 10uF, connect from IN to VSS. Absolute max 30V, operating range 3.5-28V.
2	ISET	input	Programs the fast-charge current. External resistor from ISET to VSS defines fast-charge current value. Range is 10.8k (50mA) to 540 ohm (1000mA).
3	VSS	power_in	Ground terminal. Also serves as the reference for the thermal pad, which must be connected to the same potential as VSS.
4	PRETERM	input	Programs the current termination threshold (5 to 50% of Iout set by ISET) and sets the pre-charge current to twice the termination current level. Expected programming resistor range is 1k to 10k ohm.
5	PG	output	Power-good open-drain output (active low, FET on). Indicates the input voltage is above UVLO and above the OUT (battery) voltage.
6	NC	unconnected	Do not make a connection to this terminal (for internal use). Do not route through this terminal.
7	ISET2	input	Programs the input/output current limit for the USB or adaptor source. On bq24040/5: High = 500mA max, Low = ISET-programmed, Float = 100mA max.
8	CHG	output	Charge-status open-drain output. Low (FET on) indicates charging in progress; open drain (FET off) indicates no charging or charge complete.
9	TS	input	Temperature-sense terminal connected to a 10k @ 25 degC NTC thermistor in the battery pack. Floating or pulling high puts part in TTDM Charger mode and disables TS monitoring, timers, and termination. Pulling low disables the IC. If NTC sensing is not needed, connect via 10k to VSS. A 250k from TS to ground prevents entering TTDM when battery-with-thermistor is removed.
10	OUT	power_out	Battery connection. System load may also be connected. Expected range of bypass capacitors 1uF to 10uF. Absolute max output continuous current 1.25A.
11	PAD	passive	Thermal pad (2x2 mm). There is an internal electrical connection between the thermal pad and the VSS terminal. The thermal pad must be connected to the same potential as VSS on the PCB. Do not use the thermal pad as the primary ground input; VSS must be connected to ground at all times.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	WSON-10-EP(2x2)
Category	PMIC
Pins	11

Ordering variants

Same part, different packaging or reel option.

BQ24045DSQR
BQ24045DSQRDSQT

CAD (KiCad official)

Symbol: BQ24045DSQR
Footprint: Package_DFN_QFN:Texas_DSQ0010A_WSON-10-1EP_2x2mm_P0.4mm_EP0.9x1.5mm
3D model: WSON-10-EP(2x2) (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (39 pp, sha256 c508c9c2aedb88aa, retrieved 2026-08-17, tier: manufacturer)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF