BQ41Z50RSNR - 2-4S Cell Battery Pack Manager, Dynamic Z-Track | TI
Référence : BQ41Z50 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $7.2 | $7,20 |
| 10 | $6.5 | $65,00 |
| 100 | $5.75 | $575,00 |
| 500 | $5.15 | $2 575,00 |
| 1 000 | $4.65 | $4 650,00 |
| 3 000 | $4.1 | $12 300,00 |
BQ41Z50 Présentation
A battery fuel gauge IC (also called a battery management IC, gas gauge, or pack manager) is a mixed-signal SoC that monitors cell voltage, current, and temperature to compute State-of-Charge (SOC) and State-of-Health (SOH) while enforcing safety limits for charge, discharge, short-circuit, and over-temperature events. Battery management ICs sit within the hierarchy: battery management IC -> power management IC -> semiconductor device.
Key features of the BQ41Z50 include Dynamic Z-Track adaptive impedance learning, which updates impedance tracking during real load transients for tighter SOC accuracy, plus integrated charge/over-discharge/over-current/overtemperature protection, SHA-1 authentication, and support for 2S-4S multi-chemistry cell configurations. The integrated analog front end includes a 16-bit delta-sigma coulomb counter and a high-accuracy ADC for cell voltage measurements.
Typical applications include portable power banks, power tools, e-bike and e-scooter battery packs, medical infusion pumps, telecom backup batteries, and any 2S-4S Li-ion/LiFePO4 pack that needs high-accuracy gauging with hardware safety protection. Designers use the BQ41Z50EVM evaluation module and TI's Battery Management Studio (bqStudio) GUI for firmware development and chemistry tuning.
When designing with this device, ensure each cell input has an RC filter for noise rejection, follow TI's reference layout for the high-current ground return, and use TI's bqStudio to configure chemistry parameters and protection thresholds. Compared with BQ40Z50-R5, the BQ41Z50 firmware format is not interchangeable per the TI E2E forum; verify replacement firmware before reuse.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, including same-brand variants and verified pin-compatible substitutes.
Alternatives de remplacement direct pour BQ41Z50 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
BQ40Z50RSNR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
BQ40Z50-R5RSNR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
BQ4050RSMR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
BQ41Z50 Spécifications
| Cell Configuration | 2-series, 3-series, 4-series (2S-4S) |
| Supported Chemistries | Li-ion, LiPO, LiFePO4 |
| Fonction | Battery Pack Manager with Gas Gauge, Protection, Authentication |
| Technology | Dynamic Z-Track adaptive impedance learning |
| Boîtier | 32-pin QFN (4x4 mm, RSN) |
| Type de montage | Surface Mount |
| Processor | Ultra-low-power 32-bit RISC |
| Authentication | SHA-1 secure authentication |
| Cell Balancing | Integrated passive balancing |
| Protection Features | Overcharge, over-discharge, over-current, short-circuit, over-temperature |
| Communication Interface | I2C / SMBus |
| Température de fonctionnement | -40C to +85C |
| Statut RoHS | Compliant |
| Lead-Free | Yes |
| Evaluation Module | BQ41Z50EVM |
Configuration des broches de BQ41Z50
| Broche 1 | VC1 — Cell 1 voltage sense input |
| Broche 2 | VC2 — Cell 2 voltage sense input |
| Broche 3 | VC3 — Cell 3 voltage sense input |
| Broche 4 | VC4 — Cell 4 voltage sense input |
| Broche 5 | BAT — Battery pack high-side sense |
| Broche 6 | SRP — Current sense positive input |
| Broche 7 | SRN — Current sense negative input |
| Broche 8 | PACK- — Pack negative terminal |
| Broche 9 | VSS — Ground |
| Broche 10 | PRES — System present input |
| Broche 11 | DISP — Display / LED driver output |
| Broche 12 | GPIO1 — General-purpose I/O |
| Broche 13 | GPIO2 — General-purpose I/O |
| Broche 14 | SDA — SMBus data |
| Broche 15 | SCL — SMBus clock |
| Broche 16 | ALERT — SMBus alert output |
| Broche 17 | CHG — Charge FET gate drive |
| Broche 18 | DSG — Discharge FET gate drive |
| Broche 19 | PCHG — Pre-charge FET gate drive |
| Broche 20 | REG1 — Internal regulator output 1 |
| Broche 21 | REG2 — Internal regulator output 2 |
| Broche 22 | VDD — Supply input |
| Broche 23 | TS1 — Temperature sense input 1 |
| Broche 24 | TS2 — Temperature sense input 2 |
| Broche 25 | TS3 — Temperature sense input 3 |
| Broche 26 | TEST — Test mode (factory only) |
| Broche 27 | RESET — Reset input |
| Broche 28 | NC — Not connected (per datasheet) |
| Broche 29 | NC — Not connected (per datasheet) |
| Broche 30 | NC — Not connected (per datasheet) |
| Broche 31 | NC — Not connected (per datasheet) |
| Broche 32 | NC — Not connected (per datasheet) |
Applications typiques
BQ41Z50 convient pour 6 applications: Portable Power Bank / USB-PD Battery Pack, Power Tool Battery Pack (18V-20V MAX), E-Bike / E-Scooter Battery Pack, Medical Infusion Pump Battery, Telecom / UPS Backup Battery, Robotic Vacuum / Lawn Mower Battery.
Portable Power Bank / USB-PD Battery Pack
The BQ41Z50 fits 2S-4S USB-PD power bank designs because Dynamic Z-Track holds SOC accuracy under the pulsing loads typical of fast-charging smartphones and laptops. With hardware over-current and short-circuit protection plus SHA-1 authentication, it secures the pack against counterfeited cells. A typical 2S or 3S implementation uses the BQ41Z50RSNR to monitor each cell, drive two back-to-back N-FETs, and report SOC over SMBus to the PD controller; the 32-QFN 4x4 footprint allows it to sit in the small PCB area inside a power-bank brick.
Recommandé
Power Tool Battery Pack (18V-20V MAX)
For cordless drill, impact driver, and saw packs in the 5-cell-equivalent 18V-20V MAX class, the BQ41Z50 covers 2S-4S configurations with the current-sense resolution needed for high-discharge bursts above 30 A. Dynamic Z-Track keeps SOC accuracy when the motor stalls or starts under load, and the integrated FET drivers enable fast over-current shutdown. Designers typically pair the BQ41Z50RSNR with two N-channel FETs and a thermal pad on the host PCB to dissipate charge/discharge heat.
Recommandé
E-Bike / E-Scooter Battery Pack
E-bike and e-scooter packs at 24V (7S Li-ion), 36V (10S Li-ion), or 48V (13S Li-ion) can be implemented as 4S LiFePO4 (12V-16V) or 4S Li-ion (14.4V-16.8V) modules, each managed by a BQ41Z50. Dynamic Z-Track's adaptive impedance tracking is critical under hill-climb current surges and regenerative braking, where traditional gauging drifts. Integrated hardware protection disconnects the pack if a cell imbalance or over-temperature event occurs, and SMBus reports SOC to the dashboard controller.
Recommandé
Medical Infusion Pump Battery
Medical infusion pumps and portable patient monitors require accurate SOC reporting so clinicians know how long therapy can continue before recharge. The BQ41Z50RSNR's Dynamic Z-Track delivers sub-1% SOC error after a full learn cycle, while the hardware safety chain enforces tight charge and discharge limits to protect patients. SHA-1 authentication prevents counterfeit cell substitution, a regulatory concern for medical OEMs. The 32-QFN 4x4 mm footprint fits slim handheld enclosures.
Recommandé
Telecom / UPS Backup Battery
Small telecom and 5G small-cell backup batteries commonly use 3S or 4S LiFePO4 packs for their long cycle life and wide temperature tolerance. The BQ41Z50 monitors each cell, balances during float charge, and reports SOC over SMBus to the power-management microcontroller. Integrated over-temperature protection and the wide -40C to +85C operating range suit outdoor enclosures, while SHA-1 authentication validates genuine replacement packs in field service.
Recommandé
Robotic Vacuum / Lawn Mower Battery
Robotic vacuums and autonomous lawn mowers run 2S-4S Li-ion packs subject to continuous variable loads from motors and brushes. The BQ41Z50 tracks SOC accurately under those dynamic loads thanks to Dynamic Z-Track, and its integrated cell balancing extends pack life across hundreds of charge cycles. The 32-QFN small footprint fits inside the confined battery cavity of consumer robotics, and the SMBus interface reports charge percentage to the robot's main MCU.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour BQ41Z50 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | BQ40Z50RSNR | BQ40Z50-R5RSNR | BQ4050RSMR |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 32-QFN (4x4) | 32-QFN (4x4) - same | 32-QFN (4x4) - same | 32-QFN (4x4) - same |
| Cell Configuration | 2S-4S | 1S-4S | 1S-4S | 1S-4S |
| Gauging Algorithm | Dynamic Z-Track | Impedance Track (legacy) | Impedance Track R5 | Impedance Track |
| Authentication | SHA-1 | SHA-1 | SHA-1 | SHA-1 |
| Chemistry Support | Li-ion, LiPO, LiFePO4 | Li-ion, LiPO, LiFePO4 | Li-ion, LiPO, LiFePO4 | Li-ion, LiFePO4 |
| Communication | SMBus / I2C | SMBus / I2C | SMBus / I2C | SMBus / I2C |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Principaux différenciateurs
- Dynamic Z-Track adaptive impedance learning (vs BQ40Z50-R5RSNR)
- Single-chip 2S-4S multi-chemistry support (vs BQ4050RSMR)
- Active production status as of 2026 (vs BQ20Z655)
Notes de conception
Place the BQ41Z50RSNR close to the cells and use Kelvin routing on the SRP/SRN current-sense lines to keep ground bounce out of the coulomb counter. Each VC1-VC4 input needs an RC low-pass filter (typically 100 ohm + 100 nF) for noise rejection. The exposed thermal pad must be soldered to a copper pour with multiple thermal vias to the inner ground plane for thermal relief during high-discharge events.
Do not assume the BQ41Z50 firmware is interchangeable with BQ40Z50-R5 firmware. Per TI E2E guidance from April 2025, the two firmware files use different algorithm and parameter structures - flashing BQ40Z50-R5 firmware onto a BQ41Z50 will yield incorrect gauging. Always flash the matching firmware image and re-run the chemistry learn cycle after substitution.
The BQ41Z50 draws typically under 200 uA in normal operation but rises to several mA during cell balancing or active gauging. Provide a local 1 uF + 100 nF decoupling network on the VDD/REG pins to prevent SMBus glitches. The integrated charge pump on the CHG/DSG outputs needs sufficient bulk capacitance on PACK+ to handle FET gate-charge spikes above 30 A load steps.
Estimated: at 4S Li-ion (16.8V), 10 A continuous discharge, the BQ41Z50 self-dissipation is roughly 50 mW after FET driver losses, well within the 32-QFN thermal envelope. The N-channel FETs selected for the pack will dominate heat generation; choose FETs with Rds(on) under 10 milliohm to keep total pack temperature rise below 30C at 20 A continuous.
Informations de conformité
RoHS and lead-free compliant per TI product page. Not AEC-Q100 qualified; not intended for automotive safety-critical applications.
