BQ76952
Battery Monitor and ProtectorThe BQ76952 is a battery monitor and protector from Texas Instruments. View the full BQ76952 datasheet below including key specifications, absolute maximum ratings.
Official BQ76952 datasheet (PDF) — the source this page was extracted from.
BQ76952 Key Specifications
| Parameter | Value |
|---|---|
| Pin Count | 48 |
| Cell Count | 3-series to 16-series |
| Package Dimensions | 7 mm × 7 mm body, 1.2 mm max height |
| SLEEP Mode Current | 24 μA to 41 μA |
| Thermistor Support | Internal sensor plus up to 9 external thermistors |
| NORMAL Mode Current | 286 μA |
| Cell Voltage Accuracy | < 10 mV (typical) |
| SHUTDOWN Mode Current | 1 μA |
| DEEPSLEEP Mode Current | 9 μA to 10 μA |
| Communication Interfaces | I2C (400 kHz), SPI, HDQ one-wire |
| Current Measurement Range | ±200 mV across sense resistor |
| Coulomb Counter Input Offset Error | < 1 μV (typical) |
| Programmable LDO Outputs (REG1/REG2) | 1.8 V, 2.5 V, 3.0 V, 3.3 V, or 5.0 V |
| Cell Connect/Select Pin Voltage Tolerance | 85 V |
BQ76952 Overview
Part: BQ76952 — Texas Instruments
Type: High Accuracy Battery Monitor and Protector
Description: A highly integrated, high-accuracy battery monitor and protector for 3-series to 16-series Li-ion, Li-polymer, and LiFePO4 battery packs, featuring extensive protection, dual ADCs, and multiple communication interfaces.
Operating Conditions:
- Cell series: 3 to 16 series
- Communication interfaces: 400-kHz I2C, SPI, HDQ one-wire
Absolute Maximum Ratings:
- Max supply voltage: 85 V (on cell connect and select additional pins)
Key Specs:
- Coulomb counter input offset error: < 1 μV (typical)
- Cell voltage measurement accuracy: < 10 mV (typical)
- Current measurement range: ±200 mV across sense resistor
- NORMAL mode supply current: 286 μA
- SLEEP mode supply current: 24 μA to 41 μA
- DEEPSLEEP mode supply current: 9 μA to 10 μA
- SHUTDOWN mode supply current: 1 μA
- External thermistor support: Up to nine
Features:
- Integrated charge pump for high-side NFET protection
- Extensive protection suite (voltage, temperature, current, internal diagnostics)
- Support for simultaneous current and voltage sampling
- Integrated secondary chemical fuse drive protection
- Autonomous or host-controlled cell balancing
- Integrated one-time-programmable (OTP) memory
- Dual-programmable LDOs for external system usage
- Tolerant of random cell attach sequence
Applications:
- Battery backup unit (BBU)
- E-bike, e-scooter, and LEV
- Cordless power tools and garden tools
- Non-military drones
- Other industrial battery pack (≥10S)
Package:
- PFB (48-pin)
BQ76952 Features
- Battery monitoring capability for 3-series to 16series cells
- Integrated charge pump for high-side NFET protection with optional autonomous recovery
- Extensive protection suite including voltage, temperature, current, and internal diagnostics
- Two independent ADCs
- -Support for simultaneous current and voltage sampling
- -High-accuracy coulomb counter with input offset error < 1 μV (typical)
- -High accuracy cell voltage measurement < 10 mV (typical)
- Wide-range current applications (±200-mV measurement range across sense resistor)
- Integrated secondary chemical fuse drive protection
- Autonomous or host-controlled cell balancing
- Multiple power modes (typical battery pack operating range conditions)
- -NORMAL mode: 286 μA
- -Multiple SLEEP mode options: 24 μA to 41 μA
- -Multiple DEEPSLEEP mode options: 9 μA to 10 μA
- -SHUTDOWN mode: 1 μA
- High-voltage tolerance of 85 V on cell connect and select additional pins
- Tolerant of random cell attach sequence on production line
- Support for temperature sensing using internal sensor and up to nine external thermistors
- Integrated one-time-programmable (OTP) memory programmable by customers on production line
- Communication options include 400-kHz I 2 C, SPI, and HDQ one-wire interface
- Dual-programmable LDOs for external system usage
- 48-pin TQFP package (PFB)
BQ76952 Applications
BQ76952 Pin Configuration
Table 6-1. BQ76952 TQFP Package (PFB) Pin Functions
Table 6-1. BQ76952 TQFP Package (PFB) Pin Functions
| PIN | PIN | I/O | TYPE | DESCRIPTION |
|---|---|---|---|---|
| NO. | NAME | |||
| 1 | VC15 | I | IA | Sense voltage input pin for the fifteenth cell from the bottom of the stack, balance current input for the fifteenth cell from the bottom of the stack, and return balance current for the sixteenth cell from the bottom of stack |
| 2 | VC14 | I | IA | Sense voltage input pin for the fourteenth cell from the bottom of the stack, balance current input for the fourteenth cell from the bottom of the stack, and return balance current for the fifteenth cell from the bottom of the stack |
| 3 | VC13 | I | IA | Sense voltage input pin for the thirteenth cell from the bottom of the stack, balance current input for the thirteenth cell from the bottom of the stack, and return balance current for the fourteenth cell from the bottom of the stack |
Table 6-1. BQ76952 TQFP Package (PFB) Pin Functions
BQ76952 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
| DESCRIPTION | PINS | MIN | MAX | UNIT |
|---|---|---|---|---|
| Supply voltage range | BAT | VSS-0.3 | VSS+85 | V |
| Input voltage range, V IN | PACK, LD | VSS-0.3 | VSS+85 | V |
| Input voltage range, V IN | PCHG, PDSG | the maximum of V BAT -10 or V LD -10 | VSS+85 | V |
| Input voltage range, V IN | REGIN | the maximum of VSS-0.3 or V BREG -5.5 | the minimum of VSS+6 or V BAT +0.3 or V BREG +0.3 | V |
| Input voltage range, V IN | FUSE (2) | VSS-0.3 | the minimum of VSS+20 or V BAT +0.3 | V |
| Input voltage range, V IN | BREG | the maximum of VSS-0.3 or V REGIN -0.3 | V REGIN +5.5 | V |
| Input voltage range, V IN | REG1, REG2 | VSS-0.3 | minimum of VSS+6 or V REGIN +0.3 | V |
| Input voltage range, V IN | ALERT, SCL, SDA, HDQ, CFETOFF, DFETOFF, DCHG, DDSG, RST_SHUT (3) | VSS-0.3 | VSS+6 | V |
| Input voltage range, V IN | TS1, TS2, TS3, ALERT, CFETOFF, DFETOFF, HDQ, DCHG, DDSG (when used as thermistor or general purpose ADC input) | VSS-0.3 | V REG18 + 0.3 | V |
| Input voltage range, V IN | SRP, SRN | VSS-0.3 | V REG18 + 0.3 | V |
| Input voltage range, V IN | VC16 | maximum of VSS-0.3 and VC15-0.3 | VSS+85 | V |
| Input voltage range, V IN | VC15 | maximum of VSS-0.3 and VC14-0.3 | VSS+85 | V |
| Input voltage range, V IN | VC14 | maximum of VSS-0.3 and VC13-0.3 | VSS+85 | V |
| Input voltage range, V IN | VC13 | maximum of VSS-0.3 and VC12-0.3 | VSS+85 | V |
| Input voltage range, V IN | VC12 | maximum of VSS-0.3 and VC11-0.3 | VSS+85 | V |
| Input voltage range, V IN | VC11 | maximum of VSS-0.3 and VC10-0.3 | VSS+85 | V |
| Input voltage range, V IN | VC10 | maximum of VSS-0.3 and VC9-0.3 | VSS+85 | V |
| Input voltage range, V IN | VC9 | maximum of VSS-0.3 and VC8-0.3 | VSS+85 | V |
| Input voltage range, V IN | VC8 | maximum of VSS-0.3 and VC7-0.3 | VSS+85 | V |
BQ76952 Recommended Operating Conditions
Typical values stated where TA = 25°C and VBAT = 59.2 V, min/max values stated where TA = -40°C to 85°C and VBAT = 4.7 V to 80 V (unless otherwise noted) (1)
| PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
|---|---|---|---|---|---|---|
| V BAT | Supply voltage | Voltage on BAT pin (normal operation) | 4.7 | 80 | V | |
| V BAT | Supply voltage (4) | Voltage on BAT pin (OTP programming) | 10 | 12 | V | |
| T OTP | OTP programming temperature (4) | -40 | 45 | °C | ||
| V PORA | Power-on reset | Rising threshold on BAT | 3 | 4 | V | |
| V PORA_HYS | Power-on reset hysteresis | Device shuts down when BAT < V PORA - V PORA_HYS | 180 | mV | ||
| V WAKEONLD | Wake on LD voltage | Rising edge on LD, with BAT already in valid range | 0.8 | 1.45 | 2.25 | V |
| V WAKEONTS2 | Wake on TS2 voltage | Falling edge on TS2, with BAT already in valid range. TS2 will be weakly driven with a ≈ 5 V level during shutdown. | 0.7 | 1.1 | V | |
| V IN | Input voltage range (4) | PACK, LD | 0 | 80 | V | |
| V IN | Input voltage range (4) | PCHG, PDSG | the maximum of V BAT -9 or V LD -19 | 80 | V | |
| V IN | Input voltage range (4) | REG1, REG2, RST_SHUT, ALERT, SCL, SDA, HDQ, CFETOFF, DFETOFF, DCHG, DDSG, except when the pin is being used for general purpose ADC input or thermistor measurement. | 0 | 5.5 | V | |
| V IN | Input voltage range (4) | TS1, TS2, TS3, CFETOFF, DFETOFF, DCHG, DDSG, ALERT, HDQ, when the pin is configured for general purpose ADC input or thermistor measurement. | 0 | V REG18 | V | |
| V IN | Input voltage range (4) | SRP, SRN, SRP-SRN (while measuring current) | -0.2 | 0.2 | V | |
| V IN | Input voltage range (4) | SRP, SRN (without measuring current) | -0.2 | 0.75 | V | |
| V IN | Input voltage range (4) (5) | V VC(0) | -0.2 | 0.5 | V | |
| V IN | Input voltage range (4) | V VC(x), 1 ≤ x ≤ 4 | maximum of V VC(x-1) - 0.2 or VSS-0.2 | minimum of V VC(x- 1) +5.5 or VSS+80 | V | |
| V IN | Input voltage range (4) | V VC(x), x ≥ 5 | maximum of V VC(x-1) - 0.2 or VSS + 2.0 | minimum of V VC(x-1) + 5.5 or VSS + 80 | V | |
| R C | External cell input resistance (4) (7) | 20 | 100 | Ω | ||
| C C | External cell input capacitance (4) (7) | 0.1 | 0.22 | 1 | μF | |
| V O | Output voltage range | LD | 80 | V | ||
| V O | Output voltage range (6) | CHG, DSG, CP1 | 85 | V | ||
| T OPR | Operating temperature (6) | -40 | 85 | °C |
BQ76952 Thermal Information
| THERMAL METRIC (1) | THERMAL METRIC (1) | BQ76952 PFB (TQFP) 48 PINS | UNIT |
|---|---|---|---|
| R θJA | Junction-to-ambient thermal resistance | 66 | °C/W |
| R θJC(top) | Junction-to-case (top) thermal resistance | 19.6 | °C/W |
| R θJB | Junction-to-board thermal resistance | 29.3 | °C/W |
| Ψ JT | Junction-to-top characterization parameter | 0.8 | °C/W |
| Ψ JB | Junction-to-board characterization parameter | 29.1 | °C/W |
BQ76952 Typical Application
The BQ76952 device can be used with 3-series to 16-series battery packs, supporting a top-of-stack voltage ranging from 5 V up to 80 V. To design and implement a comprehensive set of parameters for a specific battery pack, during development customers can use the Battery Management Studio (BQSTUDIO), which is a graphical user-interface tool installed on a PC. Using BQSTUDIO, the device can be configured for specific application requirements during development once the system parameters, such as fault trigger thresholds for protection, enable or disable of certain features for operation, configuration of cells, and more are known. This results in a "golden image" of settings that can then be programmed into the device registers or OTP memory.
Variants on the same datasheet
These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.
| Part Number | Manufacturer | Package |
|---|---|---|
| BQ7695201 | Texas Instruments | TQFP-48 |
| BQ7695202 | Texas Instruments | TQFP-48 |
| BQ7695203 | Texas Instruments | TQFP-48 7x7mm |
| BQ7695204 | Texas Instruments | TQFP-48 |
| BQ76952PFBR | Texas Instruments | 48-TQFP |
| BQ76952PFBR.A | Texas Instruments | TQFP-48 7x7mm |
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