BQ76952 - 3S-16S Battery Monitor & Protector | Texas Instruments
Teilenummer: BQ76952 ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $5.85 | $5,85 |
| 10 | $5.3 | $53,00 |
| 25 | $4.95 | $123,75 |
| 100 | $4.4 | $440,00 |
| 250 | $4.05 | $1.012,50 |
| 1.000 | $3.65 | $3.650,00 |
BQ76952 Übersicht
A battery monitor and protector is an integrated circuit at the heart of a battery management system (BMS) that measures individual cell voltages, pack current, and temperature, and provides protection against overvoltage, undervoltage, overcurrent, and overtemperature faults. Within the BMS hierarchy (battery pack -> BMS AFE -> analog front end -> power management IC), the BQ76952 acts as the AFE, communicating with a host microcontroller for state-of-charge estimation, balancing, and safety. Integrated high-side charge-pump NFET drivers control external power FETs for pack-level disconnect.
Key features include support for 3S-16S Li-ion, Li-polymer, and LiFePO4 chemistries; a configurable protection subsystem covering current, voltage, and temperature faults; autonomous or host-controlled cell balancing; integrated high-side charge-pump NFET drivers; and temperature sensing through external thermistors plus internal die measurement. According to the BQ76952 Technical Reference Manual, up to 9 thermistors are supported in addition to internal die temperature. The standard BQ76952 uses I2C communication with CRC disabled by default; the BQ7695202 variant enables CRC on I2C by default.
Architecturally, the device pairs a precision differential ADC (each cell voltage measured differentially, VC1-VC0 through VC16-VC15) with a dedicated protection engine that operates autonomously during critical faults, so protection does not depend on the host. TI application note SLUAAF2 documents pin-equivalent diagrams across the BQ76952, BQ76942, and BQ769142 family, confirming pin-compatible drop-in migration: the BQ76942 is optimized for up to 10S packs, and the BQ769142 is functionally the same as the BQ76952 except I2C CRC is enabled by default.
Typical applications include e-bike and e-scooter packs, power tool packs, energy storage systems, UPS backup, portable equipment, and industrial robots. High-side NFET drivers minimize external components while configurable protections address short circuit, overcurrent, voltage, and temperature events.
Design tip: size protection FETs for pack current, terminate unused high-voltage pins per the TI datasheet recommendations, and confirm I2C CRC requirements before choosing between BQ76952, BQ769142, and BQ7695202 variants.
Drop-in-Alternativen für BQ76952 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit BQ76952 (gleiche Bauform und Footprint) – abweichend in Package, Communication Interface, Function, Number of Cells.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
BQ7695202
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
BQ76952-Q1
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
BQ769142
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
BQ76942
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
BQ76952 Technische Daten
| Cell Count | 3-series to 16-series |
| Supported Chemistries | Li-ion, Li-polymer, LiFePO4 |
| Funktion | Battery monitor and protector (BMS AFE) |
| Cell Voltage Measurement | Differential (e.g., VC1-VC0 through VC16-VC15) |
| Cell Balancing | Autonomous or host-controlled |
| FET Drivers | Integrated high-side charge-pump NFET drivers |
| Protection Subsystem | Configurable current, voltage, temperature protections |
| Communication Interface | I2C (CRC disabled by default) |
| Thermistor Inputs | Up to 9 external thermistors + internal die temperature |
| Gehäuse | 48-TQFP (7x7 mm) |
| Montageart | Surface Mount |
BQ76952 Pin-Konfiguration
| Pin [DATA_NEEDED] | VC0 — Cell 0 (bottom) sense input |
| Pin [DATA_NEEDED] | VC1-VC15 — Cell sense inputs (differential pairs VC1-VC0 ... VC16-VC15) |
| Pin [DATA_NEEDED] | CAP1-CAP3 — Internal regulator decoupling pins |
| Pin [DATA_NEEDED] | SRP/SRN — Coulomb counter sense resistor inputs |
| Pin [DATA_NEEDED] | CHG — Charge FET driver output (high-side) |
| Pin [DATA_NEEDED] | DSG — Discharge FET driver output (high-side) |
| Pin [DATA_NEEDED] | PACK — PACK+ high-voltage input |
| Pin [DATA_NEEDED] | BAT — Device supply input |
| Pin [DATA_NEEDED] | LD — Load detect / LDO pin |
| Pin [DATA_NEEDED] | TS1-TS9 — Thermistor inputs (up to 9) |
| Pin [DATA_NEEDED] | SDA/SCL — I2C communication interface |
| Pin [DATA_NEEDED] | GND — Ground |
Typische Anwendungen
BQ76952 ist geeignet für 6 Anwendungs: E-bike and E-scooter Battery Packs, Energy Storage Systems (ESS), Power Tool Battery Packs, UPS and Backup Power Systems, Industrial Robots and AGVs, Portable Equipment Battery Packs.
E-bike and E-scooter Battery Packs
E-bike and e-scooter packs typically use 10S-13S Li-ion configurations, squarely within the BQ76952's 3S-16S range. The integrated high-side charge-pump NFET drivers minimize external FET-driver circuitry, while the autonomous protection engine handles overcurrent, short-circuit, cell overvoltage, and overtemperature faults without host intervention - important for safety in consumer light-electric-vehicle packs. Differential per-cell measurement supports accurate state-of-charge estimation for range displays. Place the AFE on the BMS board adjacent to the cell taps with short, balanced VC traces to preserve measurement accuracy.
Empfohlen
Energy Storage Systems (ESS)
Home and commercial energy storage packs commonly stack 14S-16S LiFePO4 cells, matching the top of the BQ76952's 3S-16S range and its LiFePO4 chemistry support. The configurable protection subsystem allows LiFePO4-appropriate voltage thresholds, and autonomous balancing keeps long strings aligned over years of daily cycling. Up to 9 thermistor inputs cover cell, busbar, and FET temperature monitoring demanded by ESS safety standards. Host MCUs connect via I2C for state-of-charge and state-of-health telemetry, while the AFE independently enforces hard fault protection during charging anomalies.
Empfohlen
Power Tool Battery Packs
Power tool packs face extreme current pulses and frequent short-circuit stress. The BQ76952's dedicated protection engine reacts autonomously to overcurrent and short-circuit events, and its integrated high-side NFET drivers switch external protection FETs sized for high discharge currents - no separate driver IC required. Host-controlled balancing supports fast-charging workflows, and Li-ion thresholds are fully configurable for high-C-rate cells. The 48-TQFP (7x7 mm) package fits compact tool-pack PCBs, while differential cell measurement maintains accuracy despite noisy high-current switching environments typical of brushless tool platforms.
Empfohlen
UPS and Backup Power Systems
UPS battery packs using 12S-16S Li-ion strings benefit from the BQ76952's 3S-16S coverage and autonomous protection that acts even when the host is offline during a fault - critical in backup power where the MCU may be rebooting during the exact event protection is needed. Configurable temperature protection safeguards packs in hot equipment rooms, and up to 9 thermistor inputs provide redundant sensing. The I2C interface with optional CRC (BQ7695202/BQ769142 variants) adds communication robustness for electrically noisy server-room environments, supporting long service-life pack management.
Empfohlen
Industrial Robots and AGVs
Industrial robots and automated guided vehicles use 10S-16S packs subjected to continuous high-current cycling and regenerative braking events. The BQ76952's configurable overcurrent protections accommodate both discharge and charge (regen) directions, and high-side NFET drivers disconnect the pack under fault without ground-lift concerns. Autonomous balancing during charging pauses keeps large strings uniform across thousands of cycles. AEC-Q100-qualified BQ76952-Q1 is available for designs seeking automotive-grade qualification levels in harsh factory environments, with identical pinout and configuration to the catalog BQ76952.
Empfohlen
Portable Equipment Battery Packs
Portable and handheld equipment with 3S-7S packs can use the BQ76952 at the low end of its range, or the pin-compatible BQ76942 (up to 10S) for cost optimization. The integrated AFE replaces discrete monitor, protector, and driver ICs, shrinking BMS board area in space-constrained products. Quiescent operation in SHIP mode preserves shelf life for devices stored between uses. The shared pin-equivalent architecture documented in TI application note SLUAAF2 lets one PCB layout serve multiple products across the 3S-16S family, simplifying platform designs and reducing qualification effort.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für BQ76952 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | BQ7695202 | BQ76952-Q1 | BQ769142 | BQ76942 |
|---|---|---|---|---|---|
| Package | 48-TQFP (7x7) | 48-TQFP (7x7) - same | 48-TQFP (7x7) - same | 48-TQFP (7x7) - same | 48-TQFP (7x7) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Cell Count Range | 3S-16S | 3S-16S | 3S-16S | 3S-16S | up to 10S |
| FET Drivers | Integrated high-side charge-pump NFET | Integrated high-side | Integrated high-side | Integrated high-side | Integrated high-side |
| Automotive Grade | No | No | Yes (AEC-Q100) | No | No |
| Cell Balancing | Autonomous or host-controlled | Autonomous or host-controlled | Autonomous or host-controlled | Autonomous or host-controlled | Autonomous or host-controlled |
| Thermistor Inputs | Up to 9 + internal die | Up to 9 + internal die | Up to 9 + internal die | Up to 9 + internal die | Up to 9 + internal die |
Wichtigste Unterscheidungsmerkmale
- Full 3S-16S coverage in one AFE (vs. BQ76942)
- CRC-off I2C default simplifies basic hosts (vs. BQ769142)
- Integrated high-side FET drivers (vs. ADI LTC6813)
Designhinweise
Route VC0-VC16 cell sense traces as balanced differential pairs from each cell tap to the BQ76952, and place 100-ohm (typical) series resistors plus filter capacitors at each input per the TI datasheet recommendations. Keep the sense lines away from high-current FET paths to preserve differential measurement accuracy. Consult TI reference design TIDA-010247 for a proven 32S stacked layout using BQ7695202 devices.
Terminate unused high-voltage pins per the TI application note SLUAAF2 pin-equivalent guidance - e.g., PACK+ and LD have specific connection recommendations when unused (LD to PACK+ via resistor or to ground). E2E forum threads confirm incorrect unused-pin termination is a common field failure cause. Also confirm I2C CRC expectations before selecting between BQ76952 (CRC off), BQ769142 and BQ7695202 (CRC on by default).
Size the external protection NFETs (driven by the CHG/DSG high-side charge-pump outputs) for full pack current, short-circuit withstand, and thermal dissipation. High-side NFET topology avoids ground-lift during fault disconnect, but verify charge-pump drive capability against the chosen FET gate charge. Add sense-resistor Kelvin connections at SRP/SRN for accurate couomb counting.
Compliance-Informationen
Compliance details not present in provided data. The BQ76952-Q1 variant is the automotive-qualified family member. Verify RoHS/REACH status on TI product page before procurement.
