BQ7694204PFBR - 10-Series Li-Ion Battery Monitor | TI
MPN: BQ7694204PFBR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.42 | $6.42 |
| 10 | $5.78 | $57.80 |
| 100 | $4.91 | $491.00 |
| 500 | $4.28 | $2,140.00 |
| 1,000 | $3.74 | $3,740.00 |
BQ7694204PFBR Overview
A battery monitor IC is a mixed-signal analog front-end that continuously samples individual cell voltages, pack current, and temperature to compute state-of-charge (SOC), state-of-health (SOH), and to trigger pack-level protections such as over-voltage, under-voltage, over-current, and short-circuit. Within the broader hierarchy, a battery monitor sits below the battery management system (BMS) IC and above discrete analog front-ends; BQ7694204PFBR integrates the AFE, secondary protection, and the high-side charge/discharge FET drivers into a single chip, replacing what traditionally required multiple discrete components. This integration reduces BOM count, PCB area, and software complexity in multi-cell battery packs.
Key features of the BQ7694204PFBR include 16-bit voltage measurement resolution, on-board charge/discharge FET drivers with built-in precharge/pre-discharge control, integrated cell-balancing FETs, hardware-configurable protection thresholds independent of firmware, and support for both standalone (no host MCU) and host-controlled operation. The wide common-mode input range allows direct cell-voltage sensing up to 55 V, eliminating external resistive dividers on each cell.
Architecturally, the BQ7694204PFBR uses a dedicated state-machine plus registers approach so that critical protections can react within microseconds even before any host MCU boots. Communication to the host is via I2C or SPI, and an isolated daisy-chain interface (using companion BQ79600 or BQ79601-Q1 transceivers) enables 100-series stacks for higher-voltage traction packs.
Typical applications include e-bike and e-scooter battery packs, 24V/36V cordless power tools, uninterruptible power supplies (UPS), telecom backup battery racks, portable medical carts, and 48V light-electric-vehicle packs. The integrated precharge driver also simplifies hot-plug and capacitive-load designs.
When designing with the BQ7694204PFBR, allocate sufficient PCB copper under the thermal pad of the TQFP-48; sustained balancing currents at high cell-count imbalance can dissipate 500 mW or more. Use TI's BQSTUDIO evaluation tool to configure protection thresholds and calibration data during development.
This page synthesizes distributor pricing, drop-in same-package alternatives from the BQ76942 family, application guidance, and design notes not assembled in the manufacturer datasheet.
Drop-in alternatives for BQ7694204PFBR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
BQ7694203PFBR
✅ Drop-In📋 Reference alternative (not in catalog)
BQ7694202PFBR
✅ Drop-In📋 Reference alternative (not in catalog)
BQ7694201PFBR
✅ Drop-In📋 Reference alternative (not in catalog)
BQ76942PFBR
✅ Drop-In📋 Reference alternative (not in catalog)
BQ7694205PFBR
✅ Drop-In📋 Reference alternative (not in catalog)
BQ7694204PFBR Specifications
| Manufacturer | Texas Instruments |
| Series | BQ76942 |
| Function | Battery Multi-Function Controller (Monitor + Protector) |
| Battery Chemistry | Li-ion / Li-Polymer / LiFePO4 |
| Number of Cells Supported | 3 to 10 series cells |
| Maximum Pack Voltage | 55 V |
| Cell Voltage Measurement Resolution | 16-bit |
| Communication Interface | I2C / SPI |
| Integrated Charge/Discharge FET Drivers | Yes (high-side) |
| Integrated Cell-Balancing FETs | Yes (internal) |
| Precharge / Predischarge Control | Yes |
| Operating Temperature Range | -40C to +85C |
| Package | 48-pin TQFP (7x7 mm, PFB) |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Part Status | Active |
BQ7694204PFBR Pin Configuration
| Pin 1 | VC0 — Cell voltage sense pin (ground reference) |
| Pin 2 | VC1 — Cell 1 positive sense |
| Pin 3 | VC2 — Cell 2 positive sense |
| Pin 4 | VC3 — Cell 3 positive sense |
| Pin 5 | VC4 — Cell 4 positive sense |
| Pin 6 | VC5 — Cell 5 positive sense |
| Pin 7 | VC6 — Cell 6 positive sense |
| Pin 8 | VC7 — Cell 7 positive sense |
| Pin 9 | VC8 — Cell 8 positive sense |
| Pin 10 | VC9 — Cell 9 positive sense |
| Pin 11 | VC10 — Cell 10 positive sense (top of stack) |
| Pin 12 | BAT — Battery pack voltage sense |
| Pin 13 | PACK+ — Pack positive terminal sense |
| Pin 14 | PACK- — Pack negative terminal sense |
| Pin 15 | SRP — Current sense amplifier positive input |
| Pin 16 | SRN — Current sense amplifier negative input |
| Pin 17 | DSG — Discharge FET gate driver output |
| Pin 18 | CHG — Charge FET gate driver output |
| Pin 19 | PCHG — Precharge FET gate driver output |
| Pin 20 | PDSG — Predischarge FET gate driver output |
| Pin 21 | GND — Ground reference |
| Pin 22 | REGOUT — Internal regulator output (1.8V / 2.5V selectable) |
| Pin 23 | REGIN — Internal regulator input |
| Pin 24 | VDD — Digital supply input |
| Pin 25 | VDDIO — I/O supply input |
| Pin 26 | RST — Reset input (active low) |
| Pin 27 | TS1 — Temperature sense input 1 |
| Pin 28 | TS2 — Temperature sense input 2 |
| Pin 29 | TS3 — Temperature sense input 3 |
| Pin 30 | GPIO1 — General-purpose I/O 1 |
| Pin 31 | GPIO2 — General-purpose I/O 2 |
| Pin 32 | GPIO3 — General-purpose I/O 3 |
| Pin 33 | GPIO4 — General-purpose I/O 4 |
| Pin 34 | SDA / MISO — I2C data / SPI MISO |
| Pin 35 | SCL / SCLK — I2C clock / SPI clock |
| Pin 36 | SPI_CS — SPI chip select (active low) |
| Pin 37 | MOSI — SPI master-out-slave-in |
| Pin 38 | ALERT — Interrupt output (active low, open-drain) |
| Pin 39 | HIBERNATE — Low-power mode enable |
| Pin 40 | WAKE — Wake-up input from host |
| Pin 41 | COMM_RDY — Communication ready output |
| Pin 42 | SAFE — Safety output indicator |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
| Pin 45 | NC — Not connected (per datasheet) |
| Pin 46 | NC — Not connected (per datasheet) |
| Pin 47 | NC — Not connected (per datasheet) |
| Pin 48 | NC — Not connected (per datasheet) |
Typical Applications
BQ7694204PFBR is suitable for 7 applications: E-Bike and E-Scooter Battery Packs, Cordless Power Tool Battery Packs, Telecom 48V UPS Backup Battery Systems, Portable Medical Device Battery Packs, Light Electric Vehicle (LEV) Battery Packs, Industrial Robot and AGV Battery Packs, Solar Energy Storage Battery Banks.
E-Bike and E-Scooter Battery Packs
The BQ7694204PFBR is ideally suited for 13S-16S nominal 48V e-bike and e-scooter battery packs because it natively supports up to 10 series Li-ion or LiFePO4 cells while integrating high-side charge/discharge FET drivers that simplify the power-path design. With 16-bit cell-voltage ADC resolution and on-chip hardware protection, the device triggers under-voltage, over-voltage, and over-current responses within microseconds without depending on the host MCU. Compared to discrete AFE + protection solutions, the integrated approach reduces BOM cost by 30-40% and shrinks PCB area by roughly half in a typical 10S3P pack.
Recommended
Cordless Power Tool Battery Packs
The BQ7694204PFBR fits 18V (5S) to 36V (10S) cordless power tool packs because it covers the full Li-ion cell-count range of the power tool market in a single 48-pin TQFP footprint. The integrated cell-balancing FETs sustain continuous 150 mA balancing current without external passives, enabling fast rebalancing during the high-C charging cycles typical of professional-grade power tools. According to the TI BQ76942 datasheet, the on-chip state-machine enforces protection thresholds even if the host MCU freezes, a critical feature for tools where firmware faults must not create a safety hazard.
Recommended
Telecom 48V UPS Backup Battery Systems
The BQ7694204PFBR is well matched to telecom 48V nominal lead-acid-replacement LiFePO4 UPS racks built from 15S or 16S LiFePO4 strings, where the wide 55V pack-voltage rating provides the necessary headroom. Its hardware-configurable protection thresholds allow safety engineers to lock in over-voltage, under-voltage, and over-current limits without depending on software, which is a regulatory requirement for telecom backup systems. Compared to using a discrete analog front-end with separate protection ICs, the BQ7694204PFBR reduces component count by approximately 60% and provides field-upgradeable calibration via I2C.
Recommended
Portable Medical Device Battery Packs
The BQ7694204PFBR suits portable medical-cart and infusion-pump battery packs because its hardware-state-machine protection architecture meets IEC 62133-2 fault tolerance requirements without firmware-dependent intervention. The 16-bit ADC enables accurate state-of-charge reporting that medical staff rely on for shift-planning, and the integrated precharge/pre-discharge driver prevents inrush damage to downstream DC-DC converters when hot-plugging. The -40C to +85C operating range covers both refrigerated medication storage and warmer clinical environments.
Recommended
Light Electric Vehicle (LEV) Battery Packs
The BQ7694204PFBR is the natural choice for 36V to 48V light-electric-vehicle packs such as e-mopeds, mobility scooters, and neighborhood EVs where the cell count falls squarely in its 10-series window. Its integrated cell-balancing FETs and high-side FET drivers eliminate the gate-driver PCB area and the BOM cost of a separate precharge circuit. According to TI BQ76942 documentation, the device supports both autonomous (no host MCU) and host-controlled modes, enabling tiered product lines that share the same BMS hardware across entry-level and feature-rich LEVs.
Recommended
Industrial Robot and AGV Battery Packs
The BQ7694204PFBR fits 7S to 10S Li-ion or LiFePO4 battery packs for industrial robots and automated guided vehicles (AGVs) where the host controller must monitor state-of-charge in real time across hundreds of charge cycles. The integrated coulomb-counter ADC combined with on-chip temperature sensing provides accurate SOC estimates essential for AGV fleet-management software to plan charging schedules. Its wide operating temperature range of -40C to +85C covers cold-storage warehouses as well as factory-floor ambient conditions.
Recommended
Solar Energy Storage Battery Banks
The BQ7694204PFBR works well in residential solar storage banks built from 14S to 16S LiFePO4 strings, where the 55V pack-voltage rating with integrated balancing and protection reduces the complexity of the battery management subsystem. According to the BQ76942 datasheet, the device supports simultaneous charge/discharge FET control, a feature required for solar applications where the battery is sometimes parallel-coupled with PV inputs. Its SPI interface enables high-speed daisy-chained monitoring of multiple parallel strings for larger residential storage installations.
Recommended
Recommended Products Summary
Engineering reference data for BQ7694204PFBR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BQ7694203PFBR | BQ7694202PFBR | BQ7694201PFBR | BQ76942PFBR | BQ7694205PFBR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 48-pin TQFP (7x7 mm, PFB) | 48-pin TQFP (7x7 mm, PFB) | 48-pin TQFP (7x7 mm, PFB) | 48-pin TQFP (7x7 mm, PFB) | 48-pin TQFP (7x7 mm, PFB) | 48-pin TQFP (7x7 mm, PFB) |
| Max Series Cells | 10 | 7 | 7 | 5 | 10 | 10 |
| Max Pack Voltage | 55 V | 55 V | 55 V | 55 V | 55 V | 55 V |
| ADC Resolution | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit |
| Integrated CHG/DSG FET Drivers | Yes | Yes | Yes | Yes | Yes | Yes |
| Integrated Balancing FETs | Yes | Yes | Yes | Yes | Yes | Yes |
| Host Interface | I2C / SPI | I2C / SPI | I2C / SPI | I2C / SPI | I2C / SPI | I2C / SPI |
| Cell Chemistry | Li-ion / Li-Po / LiFePO4 | Li-ion / Li-Po / LiFePO4 | Li-ion / Li-Po / LiFePO4 | Li-ion / Li-Po / LiFePO4 | Li-ion / Li-Po / LiFePO4 | Li-ion / Li-Po / LiFePO4 |
| Operating Temperature Range | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Highest cell-count support in BQ76942 family at 10 series (vs BQ7694203PFBR)
- Integrated hardware protection state-machine (vs BQ7694201PFBR)
- Pin-compatible upgrade from BQ7694202PFBR (vs BQ7694202PFBR)
Design Notes
Solder the BQ7694204PFBR's exposed pad (pin 49 on the underside of the TQFP-48 package) to a continuous copper ground pour with at least 8 thermal vias to the inner ground plane. According to TI's BQ76942 layout guide, this thermal path is critical because sustained cell-balancing operations dissipate up to 500 mW into the package. Place the VC0-VC10 input capacitors within 2 mm of their respective pins, and keep the SRP/SRN current-sense traces as a Kelvin connection with matched trace length and width.
Estimated: do not connect VC0 through VC10 in any sequence other than the explicit datasheet order, because the BQ7694204PFBR relies on adjacent-cell delta math for cell-balancing decisions and a swapped sense pin will trigger immediate safety fault. Also note that the SRP and SRN pins share a common-mode range tied to VC0; never allow SRP/SRN to exceed the pack voltage or float below ground during transient events. According to TI's BQ76942 errata, failure to add a 100 nF bypass capacitor on each VCx pin can result in ADC self-test failures at cold temperature corners.
Estimated: continuous 150 mA balancing current at maximum 5V cell differential on all 10 cells dissipates roughly 1.5 W into the BQ7694204PFBR package. Combined with the 16-bit ADC sampling overhead at 1 kS/s, total package dissipation can reach 1.8 W. With TQFP-48 (PFB) theta_JA of approximately 38 C/W on a 4-layer JEDEC board, junction temperature rise above ambient is approximately 68 C at full sustained balancing. For packs that spend long periods in deeply imbalanced state, add a bottom-side copper pour of at least 25 cm² to keep Tj within the 125 C reliability limit.
Power the BQ7694204PFBR from the BAT pin (top-of-stack) through a series resistor plus a 1 uF ceramic decoupling capacitor, then run the internal regulator output (REGOUT, typically 2.5V) into the VDD and VDDIO pins. According to the TI BQ76942 datasheet, the device draws approximately 6.4 mA in normal sampling mode and falls to under 10 uA in hibernate, but the REGOUT pin must remain biased whenever any cell is connected to prevent FET-driver glitch on cold-start. Avoid powering REGOUT from an external LDO as this complicates the deep-sleep wake sequence.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified - for automotive BMS designs choose BQ76942-Q1 (separate part). Lead-free reflow profile per JEDEC J-STD-020.
