BQ24072RGTR

@@ -0,0 +1,65 @@+# BQ24072RGTR++**Texas Instruments** · Battery Management · QFN-16-EP(3x3)++BQ24072RGTR from Texas Instruments, in a QFN-16-EP(3x3). 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 | TS | input | External NTC thermistor input. Connect to a 10-kΩ NTC thermistor in the battery pack; monitors pack temperature and pauses charging when out of range. Tie to VSS through a 10-kΩ fixed resistor if unused. |+| 2 | BAT | power_out | Charger power-stage output and battery voltage-sense input. Connect to the positive terminal of the 1-cell Li-Ion battery and bypass to VSS with a 4.7-µF to 47-µF ceramic capacitor. Pins 2 and 3 must be tied together. |+| 3 | BAT | power_out | Charger power-stage output and battery voltage-sense input (see pin 2). Pins 2 and 3 must be tied together. |+| 4 | CE | input | Charge Enable active-low input. Drive low to enable charging; drive high to disable charging (OUT and battery supplement mode remain available). Internally pulled down (~285 kΩ); must not be left floating. |+| 5 | EN2 | input | Input Current Limit configuration input (MSB). Together with EN1 selects USB100 / USB500 / ILIM-resistor / Standby modes (see EN1/EN2 table). Internally pulled down (~285 kΩ); do not leave floating. |+| 6 | EN1 | input | Input Current Limit configuration input (LSB). Together with EN2 selects USB100 / USB500 / ILIM-resistor / Standby modes. Internally pulled down (~285 kΩ); do not leave floating. |+| 7 | PGOOD | output | Open-drain Power-Good status output. Pulls to VSS when a valid input source is detected on IN; high-impedance otherwise. Pull up to a logic rail through 1 kΩ-100 kΩ, or drive an indicator LED. |+| 8 | VSS | power_in | Device ground. Must be connected to the ground rail of the circuit and to the exposed thermal pad. |+| 9 | CHG | output | Open-drain charge-status indicator output (active-low, CHG-bar). Pulls to VSS while the battery is charging; high-impedance when charging is complete or disabled. Pull up to logic rail through 1 kΩ-100 kΩ or use with an LED. |+| 10 | OUT | power_out | System supply output from the power-path stage. Regulated when the input is within the valid operating range; otherwise tracks V_BAT. Bypass to VSS with 4.7-µF to 47-µF ceramic capacitor. Pins 10 and 11 must be tied together. |+| 11 | OUT | power_out | System supply output (see pin 10). Pins 10 and 11 must be tied together. |+| 12 | ILIM | input | Adjustable current-limit programming input. Connect a 1100-Ω to 8-kΩ resistor from ILIM to VSS to set the maximum input current when EN2=1, EN1=0. Leave floating to disable all charging. |+| 13 | IN | power_in | Input power connection from an AC adapter or USB port. Operating range 4.35 V to 6.6 V (BQ24072); withstands up to 26 V without damage (operation suspended above OVP). Bypass to VSS with a 1-µF to 10-µF ceramic capacitor. |+| 14 | TMR | input | Safety-timer programming input. Connect an 18-kΩ to 72-kΩ resistor from TMR to VSS to set the pre-charge and fast-charge timers; tie to VSS to disable all safety timers; leave open for default timer values. |+| 15 | TD | input | Termination Disable input. Drive high to disable charge termination; tie to VSS to enable termination. Sampled only at startup and cannot be changed during operation. Internally pulled down (~285 kΩ); do not leave floating. |+| 16 | ISET | bidirectional | Fast-charge current programming input / monitor. Connect a 590-Ω to 8.9-kΩ resistor from ISET to VSS to set fast-charge current. Voltage at ISET mirrors the actual charge current and can be used to monitor it. Leaving open disables charging. |+| 17 | PAD | power_in | Exposed thermal pad on package underside. Internally connected to VSS; must be soldered to the PCB ground plane for thermal dissipation and tied to the same potential as pin 8. Do not use as the primary ground input - VSS pin must also be grounded. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | QFN-16-EP(3x3) |+| Category | PMIC |+| Pins | 17 |++## Ordering variants++- `BQ24072RGTRRGTR`+- `BQ24072RGTRRGTT`+- `BQ24072RGTRBQ24073RGTR`+- `BQ24072RGTRBQ24073RGTT`+- `BQ24072RGTRBQ24074RGTR`+- `BQ24072RGTRBQ24074RGTT`+- `BQ24072RGTRBQ24075RGTR`+- `BQ24072RGTRBQ24075RGTT`+- `BQ24072RGTRBQ24079RGTR`+- `BQ24072RGTRBQ24079RGTT`++## CAD (KiCad official)++- Symbol: `BQ24072RGTR`+- Footprint: `Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm`+- 3D model: QFN-16-EP(3x3) (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/bq24072.pdf) (53 pp, sha256 `05585ca0112a74b0`, retrieved 2026-08-17, tier: manufacturer)+- **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](docs/bq24072rgtr-datasheet.pdf)

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