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BQ40Z50RSMT-R1

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Texas Instruments Battery Management ICs, VQFN-32-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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BQ40Z50RSMT-R1

Texas Instruments · Battery Management ICs · VQFN-32-EP(4x4)

BQ40Z50RSMT-R1 from Texas Instruments, in a VQFN-32-EP(4x4). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 PBI power_in Power supply backup input pin.
2 VC4 input Sense voltage input pin for most positive cell, and balance current input for most positive cell.
3 VC3 input Sense voltage input pin for second most positive cell, balance current input for second most positive cell, and return balance current for most positive cell.
4 VC2 input Sense voltage input pin for third most positive cell, balance current input for third most positive cell, and return balance current for second most positive cell.
5 VC1 input Sense voltage input pin for least positive cell, balance current input for least positive cell, and return balance current for third most positive cell.
6 SRN input Analog input pin connected to the internal coulomb counter peripheral for integrating a small voltage between SRP and SRN where SRP is the top of the sense resistor.
7 NC unconnected Not internally connected. Connect to VSS.
8 SRP input Analog input pin connected to the internal coulomb counter peripheral for integrating a small voltage between SRP and SRN where SRP is the top of the sense resistor.
9 VSS power_in Device ground.
10 TS1 input Temperature sensor 1 thermistor input pin.
11 TS2 input Temperature sensor 2 thermistor input pin.
12 TS3 input Temperature sensor 3 thermistor input pin.
13 TS4 input Temperature sensor 4 thermistor input pin.
14 NC unconnected Not internally connected.
15 BTP_INT output Battery Trip Point (BTP) interrupt output.
16 PRES or SHUTDN input Host system present input for removable battery pack or emergency system shutdown input for embedded pack.
17 DISP output Display control for LEDs.
18 SMBD bidirectional SMBus data pin.
19 SMBC bidirectional SMBus clock pin.
20 LEDCNTLA output LED display segment that drives the external LEDs depending on the firmware configuration.
21 LEDCNTLB output LED display segment that drives the external LEDs depending on the firmware configuration.
22 LEDCNTLC output LED display segment that drives the external LEDs depending on the firmware configuration.
23 PTC input Safety PTC thermistor input pin. To disable, connect both PTC and PTCEN to VSS.
24 PTCEN input Safety PTC thermistor enable input pin. Connect to BAT. To disable, connect both PTC and PTCEN to VSS.
25 FUSE output Fuse drive output pin.
26 VCC power_in Secondary power supply input.
27 PACK input Pack sense input pin.
28 DSG output NMOS Discharge FET drive output pin.
29 NC unconnected Not internally connected.
30 PCHG output PMOS Precharge FET drive output pin.
31 CHG output NMOS Charge FET drive output pin.
32 BAT power_in Primary power supply input pin.
33 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package VQFN-32-EP(4x4)
Category Power Supply Chip
Pins 33

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts copper if one becomes shorted. To have good ESD protection, the copper trace inductance of the capacitor leads must 29

CAD (KiCad official)

  • Symbol: BQ40Z50RSMT-R1
  • Footprint: Package_DFN_QFN:QFN-32-1EP_4x4mm_P0.4mm_EP2.9x2.9mm
  • 3D model: VQFN-32-EP(4x4) (KiCad packages3D, STEP)
  • 3D model files: bq40z50rsmt-r1-etched.step / bq40z50rsmt-r1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bq40z50rsmt-r1.step / bq40z50rsmt-r1.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (54 pp, sha256 0eb62413e2d29ec2, retrieved 2026-10-28, 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: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (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).

Datasheet PDF