Battery Management ICs for Humanoid Robots

Texas Instruments · Analog Devices · NXP · STMicroelectronics · BYD Semiconductor

A humanoid's 52V pack has about 14 cells in series, so one 16-cell monitor chip covers it, the same TI or ADI part an 800V EV pack chains 12 to 14 times. Robots therefore ride EV allocation for their most critical BMS part, while Chinese makers can draw on BYD Semiconductor, which passed 100 million automotive AFEs in July 2026.

Cell monitor chips per battery pack, at 16 cells per chip. A 52V humanoid pack of about 14 cells in series needs one; a 400V EV pack about six to seven; an 800V EV pack about 12 to 14. The robot uses the same Texas Instruments or Analog Devices part an EV uses for one module. 16-CELL MONITOR CHIPS NEEDED PER PACK Humanoid, 52V ABOUT 14 CELLS IN SERIES 1 EV, 400V ABOUT 96-110 IN SERIES 6-7 EV, 800V ABOUT 192-216 IN SERIES 12-14 ONE ROBOT PACK = ONE EV MODULE. THE SAME TI BQ79616, BQ76952 OR ADI LTC6813 SERVES BOTH, SO ROBOT DEMAND RIDES EV ALLOCATION. NMC CELLS AT ABOUT 3.7V NOMINAL; 18-CELL ADI PARTS NEED FEWER CHIPS.
Pack voltage
~48-60V
Pack energy
~2-3 kWh
AFEs per pack
1-2
EV 800V pack
12-14 AFEs
BYD Semi AFEs
100M+ shipped
Hub
Chips

Pack

A Humanoid Pack Is One EV Module

A humanoid carries a 2 to 3 kWh pack at about 50V, roughly 14 cells in series, which a single 16-cell monitor IC covers. That is the same chip an EV uses six to 14 times per pack.

Tesla quoted 2.3 kWh at 52V for Optimus; Figure AI quoted 2.25 kWh for Figure 02. The BMS reads every cell's voltage and temperature, estimates charge and health, balances cells and opens the pack on a fault, reporting to the robot's compute over CAN, SMBus or I2C.

Robot pack against EV pack
ParameterEV packHumanoid packImplication
Voltage400V or 800VAbout 48V to 60VNo high-voltage isolation stack; simpler protection
Energy60-120 kWhAbout 2-3 kWh (Tesla Optimus 2.3 kWh at 52V)Smaller absolute fault energy, but cells sit inside a machine that works beside people
Cells in series96-216About 13-16One AFE instead of a chain of six to 14
Load profileSmooth traction drawSharp peaks from dozens of joints, often togetherProtection thresholds and current sensing must ride through bursts
StandardsISO 26262, UN ECE R100IEC 62133, UL 2271 and UL 3300 for robots; no humanoid-specific ruleMakers borrow automotive-grade parts to cover the gap

Stack

Six Device Types per Pack

BMS IC stack in a humanoid pack
DeviceFunctionRepresentative partsCount per pack
Cell monitor AFEMeasures each cell to within a few millivolts; drives balancing; daisy-chains to the hostTI BQ79616, BQ76952; ADI LTC6813-1; NXP MC33771C; ST L9963E1-2
Fuel gaugeCounts charge in and out for state-of-charge and state-of-healthTI BQ34Z100-G1; ADI LTC29441
Protection and FET driverCuts the pack on overcurrent, overvoltage or short circuitTI BQ76952 (integrated); Renesas ISL94202; ABLIC S-82611-2
Current senseIsolated or shunt-based pack current for gauge and protectionTI AMC1311; ADI current-sense amplifiers; Allegro ACS7701-2
Temperature sensingNTC thermistors across cells plus digital sensorsMurata, TDK and Vishay NTCs; TI TMP1174-12
BMS MCURuns state estimation, balancing and fault logic; reports over CAN or SMBusTI TMS570; Infineon AURIX; NXP S32K; ST STM321

Concentration

TI and ADI Hold the Western AFE Market

  • US-headquartered
  • Headquartered abroad
Cell monitor AFE suppliers
SupplierHQFamiliesPosition
Texas InstrumentsDallas, TexasBQ79616 (16-cell); BQ76952 (16-cell monitor and protector)Broadest single-vendor BMS set: AFE, gauge, protection; own analog fabs
Analog DevicesWilmington, MassachusettsLTC6813-1 (18-cell), LTC6811, ADBMS lines; wireless BMSEV leader with isoSPI and wireless chains; own fabs plus TSMC
NXPEindhoven, NetherlandsMC33771C (14-cell)Widely used in European EV packs with S32K MCUs
STMicroelectronicsGeneva, SwitzerlandL9963E (14-cell)Pairs with STM32 and SPC5 MCUs in European programs
RenesasTokyo, JapanISL94202, RAA489206Smaller portfolio from Intersil; strong in lower cell counts
BYD SemiconductorShenzhen, ChinaBF8915A-1 and successorsFirst mass-produced Chinese automotive AFE (2021); over 100 million shipped by July 2026
GigaDevice; Novosense; ChipwaysBeijing; Suzhou; ShanghaiDomestic AFE and analog front-end linesQualifying with Chinese EV and robot makers

Precision across 16 cells, daisy-chain fault detection and AEC-Q100 qualification of 18 to 24 months keep the field narrow. NXP and STMicroelectronics are qualified alternatives at 14 cells per chip. China has built its own supply: BYD Semiconductor's automotive AFEs passed 100 million units in July 2026, largely in BYD packs, which gives Chinese humanoid makers a domestic path Western makers lack.

Robot needs

Burst Loads and Close Contact Change the Spec

  • Burst current: balance recovery and lifting draw peak current across many joints at once, so protection must tell a burst from a short.
  • Swaps: fleet robots change packs mid-shift, which pushes fuel-gauge accuracy and hot-swap control into the BMS.
  • Proximity: a pack inside a machine beside workers raises the cost of thermal runaway, pushing makers toward ASIL-rated automotive AFEs even without a robot standard requiring them.

Risks

Robot Demand Rides EV Allocation

At 1 million humanoids a year, robots would add roughly 1 million to 2 million AFEs, a small share of what EV and storage packs use. The exposure is allocation: in a shortage, TI and ADI serve automotive contracts first. Western makers have two qualified fallbacks at NXP and STMicroelectronics; Chinese makers have BYD Semiconductor and a growing domestic field. Pack-level ICs across EVs and storage are on Battery Management ICs.

Record

Page Record

Covers
Humanoid pack architecture, BMS IC stack, AFE suppliers in the US, Europe, Japan and China, robot versus EV requirements, supply risk
Sources
TI, ADI, NXP, ST and Renesas datasheets; Tesla AI Day 2022 (Optimus pack); Figure AI (Figure 02); Gasgoo on BYD Semiconductor AFE shipments (July 2026)
Last verified
October 2026