component
BQ51050BRHLR
Public Made by Adomby adom
Texas Instruments Battery Management, QFN-20-EP(3.7x4.7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownBQ51050BRHLR
Texas Instruments · Battery Management · QFN-20-EP(3.7x4.7)
BQ51050BRHLR from Texas Instruments, in a QFN-20-EP(3.7x4.7). 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 | PGND | power_in | Power ground connection for the device. |
| 2 | AC1 | input | AC power input from receiver coil with maximum input voltage of 20V and 2A RMS current rating. |
| 3 | BOOT1 | output | Bootstrap output for driving high-side FETs of synchronous rectifier; connect 10-nF ceramic capacitor from BOOT1 to AC1. |
| 4 | BAT | power_out | Output pin delivering regulated power to battery at 4.20V with maximum 1.5A charging current. |
| 5 | CLAMP1 | output | Open-drain FET output for non-power dissipative overvoltage AC clamp protection; activates when RECT voltage exceeds 15V threshold. |
| 6 | COMM1 | output | Open-drain output for load modulation communication with primary; connect capacitor from COMM1 to AC1 for capacitive load modulation. |
| 7 | CHG | output | Open-drain status output active when BAT output is enabled with maximum 15mA sink current rating. |
| 8 | AD-EN | output | Push-pull driver output for external PFET control when wired charging is active; float if not used. |
| 9 | AD | input | Adapter voltage detection input with 3.6V typical presence threshold and maximum 30V rating; connect 1-µF capacitor to PGND or direct to PGND if unused. |
| 10 | TERM | input | Termination threshold programming input; sets termination current as percentage of programmed charge current IBULK. |
| 11 | EN2 | input | Priority control input between wireless power and wired power with 1.3V high threshold; EN2 low enables wired charging when AD present. |
| 12 | ILIM | bidirectional | Current programming pin where total resistance RILIM from ILIM to PGND sets charging current from 500mA to 1.5A; KILIM factor is 314 AΩ. |
| 13 | TS/CTRL | input | Temperature sense input for NTC thermistor monitoring with 2.2V internal bias voltage; connect NTC resistor to PGND or 10-kΩ resistor if NTC not used. |
| 14 | FOD | input | Foreign object detection power measurement input for WPC v1.2 compatibility with 0-5W received power measurement range. |
| 15 | COMM2 | output | Open-drain output for load modulation communication with primary; connect capacitor from COMM2 to AC2 for capacitive load modulation. |
| 16 | CLAMP2 | output | Open-drain FET output for non-power dissipative overvoltage AC clamp protection; activates when RECT voltage exceeds 15V threshold. |
| 17 | BOOT2 | output | Bootstrap output for driving high-side FETs of synchronous rectifier; connect 10-nF ceramic capacitor from BOOT2 to AC2. |
| 18 | RECT | output | Filtered rectifier output node; connect ceramic capacitor from 4.7µF to 22µF to PGND depending on power level. |
| 19 | AC2 | input | AC power input from receiver coil with maximum input voltage of 20V and 2A RMS current rating. |
| 20 | PGND | power_in | Power ground connection for the device. |
| 21 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | QFN-20-EP(3.7x4.7) |
| Category | Power Management (PMIC) |
| Pins | 21 |
CAD (KiCad official)
- Symbol:
BQ51050BRHLR - Footprint:
Package_DFN_QFN:QFN-20-1EP_4x5mm_P0.5mm_EP2.65x3.65mm - 3D model: QFN-20-EP(3.7x4.7) (KiCad packages3D, STEP)
- 3D model files:
bq51050brhlr-etched.step/bq51050brhlr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bq51050brhlr.step/bq51050brhlr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (44 pp, sha256
38293c82dac0e8d1, retrieved 2026-09-22, tier: lcsc) - 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: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).