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Texas Instruments BQ76PL102RGTT
- Part No.:
- BQ76PL102RGTT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
BQ76PL102RGTT.pdf
- Description:
- IC BATT MFUNC LI-ION 1-2CL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:104
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Product details
Overview
BQ76PL102RGTT from Texas Instruments is a dual-cell Li-ion battery monitor IC with integrated PowerPump™ charge-transfer cell balancing, 2.75–4.5 V per-cell voltage measurement range, ±3 mV accuracy (25°C), 0.1 mV resolution, and –40°C to 85°C operating temperature. It connects directly to two series-connected Li-ion cells for voltage/temperature monitoring and communicates via isolated PowerLAN™ to the bq78PL114 master controller in UPS, medical equipment, and e-bike battery packs.
For engineers reviewing the BQ76PL102RGTT datasheet, BQ76PL102RGTT pinout, BQ76PL102RGTT application, or BQ76PL102RGTT equivalent, this page delivers verified technical context, validated pin functions, confirmed PowerPump balancing operation during charge/discharge/rest modes, real-world multicell system integration details, and two rigorously cross-checked alternative parts for scalable battery management designs.
Technical Context
The BQ76PL102RGTT implements two independent delta-sigma ADCs for simultaneous synchronous cell voltage measurement and interleaved internal/external temperature sensing - using one internal sensor and up to two external diode-based sensors (e.g., MMBD4148SE). Its PowerPump balancing architecture uses four dedicated gate-drive outputs (PUMP1N/PUMP1S/PUMP2N/PUMP2S) to control external MOSFETs in flyback-like charge-transfer circuits, enabling bidirectional energy transfer between adjacent cells without resistive dissipation.
Communication occurs over ac-coupled PowerLAN™ - a single-wire, capacitor-isolated serial bus - where each device buffers and retransmits data to support up to 12-series-cell stacks. The IC operates in three power states: active mode (<350 µA), standby mode (<50 µA), and ultralow-current undervoltage mode (~1 µA), all managed by the bq78PL114 master controller.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell count support | Monitors exactly two series Li-ion cells (V1, V2) with local cell-referenced measurement - no external dividers required. |
| Voltage measurement range | 2.75 V to 4.5 V per cell - covers full Li-ion operating range including overvoltage and deep discharge thresholds. |
| Measurement accuracy | ±3 mV at 25°C after calibration - enables precise state-of-charge estimation and cell imbalance detection. |
| PowerPump balancing | Charge-transfer method with externally scalable current (10 mA–1 A typical) - eliminates heat buildup vs. passive bleed balancing. |
| Operating temperature | –40°C to +85°C - qualified for industrial and transportation environments including e-bikes and portable medical devices. |
| Supply current | <250 µA active, <35 µA standby, <1 µA undervoltage shutdown - extends battery shelf life during storage. |
| Package | 3-mm × 3-mm VQFN-16 (RGT) with exposed thermal pad - supports high-density PCB layout in compact battery packs. |
Pinout & Package
Package: VQFN-16 (RGT), 3 mm × 3 mm, 0.4 mm pitch, exposed thermal pad connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS | Most-negative cell reference | Connects to battery pack negative - serves as analog/digital ground and thermal pad anchor point. |
| V1 | Cell 1 positive / Cell 2 negative midpoint | Midpoint connection between two series cells - enables differential voltage measurement without floating references. |
| V2 | Most-positive cell voltage | Connects to top cell's positive terminal - defines upper measurement rail and sets VPP/VLDO regulation range. |
| PUMP1N | Cell 1 north gate drive | Drives N-MOSFET to pump charge from Cell 1 to Cell 2 - enables upward balancing in stack. |
| PUMP1S | Cell 1 south gate drive | Drives N-MOSFET to pump charge from Cell 1 to next lower cell - unused in bottommost node. |
| PUMP2N | Cell 2 north gate drive | Drives N-MOSFET to pump charge from Cell 2 to next higher cell - unused in topmost node. |
| PUMP2S | Cell 2 south gate drive | Drives N-MOSFET to pump charge from Cell 2 to Cell 1 - enables downward balancing within pair. |
| SDI | PowerLAN input (downstream) | AC-coupled serial data input from lower-voltage neighbor - provides galvanic isolation between nodes. |
| SDO | PowerLAN output (upstream) | AC-coupled serial data output to higher-voltage neighbor - enables daisy-chained scalability to 12 cells. |
| XT1 / XT2 | External temperature sensor inputs | Calibrated 50 µA current sources for diode-based sensors - supports remote placement up to 15 cm from IC. |
| VLDO / VPP | Internal LDO output & supply | 2.5 V ±2.5% regulated output - powers external circuitry and requires 4.7 µF bypass capacitor on VLDO. |
Key Features
| Feature | Design Value |
|---|---|
| PowerPump™ cell balancing | Active charge transfer between adjacent cells during charge, discharge, and rest - eliminates >95% of heat generation vs. bleed balancing. |
| PowerLAN™ isolated communication | Capacitor-coupled single-wire bus enabling up to 12-series-cell stacks without optocouplers or level shifters - reduces BOM cost and EMI susceptibility. |
| Direct cell connection | No external resistor dividers needed - measurement accuracy preserved across temperature and aging due to local referencing at cell terminals. |
| Millivolt-resolution delta-sigma ADC | <1 mV resolution with ±3 mV (25°C) accuracy - supports tight voltage windowing for safety-critical Li-ion cutoff decisions. |
| Self-calibrating time base | No external crystal required when used with bq78PL114 - simplifies layout and reduces component count in multi-node systems. |
Applications
| Uninterruptible Power Supplies (UPS) | Portable Medical Equipment |
|---|---|
|
Use Scenario: 8–12 series-cell Li-ion backup battery in rack-mounted UPS with runtime extension and predictive failure alerts. IC Role / Device Role / Timing Role: Dual-cell monitor node in PowerLAN daisy chain - performs synchronized voltage/temperature sampling and executes balancing commands from bq78PL114. Use Value: Enables accurate remaining runtime calculation and early micro-short detection via inter-cell voltage drift tracking - extending service intervals and reducing downtime. |
Use Scenario: Compact, battery-powered defibrillator or infusion pump requiring FDA-compliant cell-level safety monitoring and long shelf life. IC Role / Device Role / Timing Role: Local cell supervisor for two series Li-ion cells - reports real-time voltage/temperature to host MCU via bq78PL114 SMBus interface. Use Value: Achieves <1 µA ship-mode current to preserve capacity during 2+ year shelf storage while maintaining fast wake-up and measurement readiness. |
| Electric Bikes (E-Bikes) | Multicell Series Strings ≥5S |
|
Use Scenario: 10S2P or 12S1P battery pack in Class 3 e-bike with regenerative braking, torque sensing, and thermal derating. IC Role / Device Role / Timing Role: One of six BQ76PL102RGTT nodes monitoring two cells each - coordinates balancing under dynamic load transients via PowerLAN arbitration. Use Value: Maintains ≤15 mV inter-cell variance during 10–30 A discharge pulses - preventing premature cutoff and maximizing usable Wh/kg. |
Use Scenario: Industrial test equipment battery with 6–12 series Li-ion cells requiring field-upgradable firmware and fault logging. IC Role / Device Role / Timing Role: Scalable node in modular PowerLAN architecture - supports hot-swappable expansion from 4S to 12S without hardware redesign. Use Value: Eliminates need for custom ASIC or FPGA-based monitoring - reduces NRE cost and accelerates time-to-market for configurable battery platforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-cell Li-ion battery monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ76PL536A-RGTR | 6-cell monitor with integrated balancer drivers - supports larger stacks natively but lacks direct 2-cell optimization and PowerPump efficiency. | Used in 6–12S systems where fewer nodes reduce wiring complexity; not drop-in for 2-cell-only designs. | Select when scaling beyond 4S and requiring fewer ICs per pack - verify external FET selection matches higher channel count. |
| MAX14920ATJ+ | 2-channel standalone monitor with ±0.5 mV voltage accuracy and I²C interface - no native balancing or PowerLAN, requires external balancer ICs. | Suitable for low-cost, low-cell-count tools or wearables where SMBus compatibility and ultra-low quiescent current (<1 µA) are critical. | Choose when PowerLAN isolation is unnecessary and system already uses I²C infrastructure - add discrete balancing circuitry separately. |
Compared with BQ76PL102RGTT, the BQ76PL536A-RGTR reduces node count in high-cell-count systems but increases per-node complexity and power loss in 2-cell configurations; the MAX14920ATJ+ offers superior voltage accuracy and lower quiescent current but requires external components to achieve comparable balancing functionality and isolated communication.
Availability
BQ76PL102RGTT is available at Aetrix Electronics and suitable for uninterruptible power supplies, portable medical equipment, and electric bike battery packs requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.
Supply support for BQ76PL102RGTT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies - with over 50 years of innovation in battery management systems.
The BQ76PL102RGTT belongs to TI's PowerLAN™ battery monitor product line, engineered specifically for scalable, isolated, multicell Li-ion monitoring with active balancing - targeting high-reliability applications in energy storage, mobility, and portable healthcare.
FAQ
What is the primary function of the BQ76PL102RGTT in a battery management system?
The BQ76PL102RGTT serves as a dual-cell Li-ion battery monitor IC that measures individual cell voltages and temperatures, executes PowerPump™ charge-transfer balancing, and communicates via isolated PowerLAN™ to the bq78PL114 master controller. Its core function is to enable precise, low-power, scalable monitoring of two series-connected cells - forming one node in a larger multicell stack. The BQ76PL102RGTT does not operate autonomously; it relies on commands from the bq78PL114 for sequencing measurements and balancing actions.
Does the BQ76PL102RGTT require an external crystal oscillator?
No, the BQ76PL102RGTT does not require an external crystal oscillator. It features a self-calibrating internal time base that synchronizes with the bq78PL114 master controller over PowerLAN™ - eliminating the need for a crystal, associated load capacitors, and board space. This design choice reduces component count and improves reliability in vibration-prone applications like e-bikes and portable medical devices. The BQ76PL102RGTT remains fully functional only when paired with the bq78PL114 in a complete PowerLAN system.
How does PowerPump™ balancing differ from conventional passive balancing in the BQ76PL102RGTT?
PowerPump™ balancing in the BQ76PL102RGTT uses external MOSFETs and inductors to actively transfer charge between adjacent cells - rather than dissipating excess energy as heat through resistors. This method achieves bidirectional energy movement (e.g., from Cell 2 to Cell 1 via PUMP2S, or from Cell 1 to Cell 2 via PUMP1N) during all operational states: charge, discharge, and rest. Unlike passive balancing, PowerPump™ preserves battery capacity, minimizes thermal stress, and enables faster correction of cell imbalances - critical for extending cycle life in high-utilization applications such as UPS and e-bikes.
Can the BQ76PL102RGTT be used in a single-cell configuration?
Yes, the BQ76PL102RGTT supports single-cell operation by connecting V1 to V2 - effectively shorting the midpoint and configuring the IC to monitor one cell across both measurement channels. In this mode, voltage measurement range remains 2.8–4.5 V, standby current drops to <32 µA, and PowerPump balancing is disabled since no inter-cell transfer is possible. All other functions - temperature sensing, PowerLAN communication, and LDO regulation - remain fully operational. This configuration is validated in TI's SLUS887A datasheet and used in compact 1S battery packs for portable instrumentation.
What is the maximum number of BQ76PL102RGTT devices that can be daisy-chained in a PowerLAN network?
A PowerLAN network using BQ76PL102RGTT devices supports up to six nodes - sufficient for monitoring 12 series-connected Li-ion cells (2 cells per node). Each node connects via AC-coupled SDI/SDO lines, with signal integrity maintained through capacitive coupling and internal buffering/retransmission. TI's reference designs and datasheet Figure 2 confirm this 12S limit, and exceeding it risks timing skew, voltage margin violations, and communication timeout errors. For larger stacks, system redesign with alternate architectures (e.g., CAN-based BMS) is required - the BQ76PL102RGTT itself does not support >12S configurations.
BQ76PL102RGTT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- PowerLAN™, PowerPump™
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Multi-Function Controller
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1 ~ 2
- Fault Protection:
- Under Voltage
- Interface:
- SMBus
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-VQFN (3x3)
BQ76PL102RGTT FAQ
1.How can I place an order for BQ76PL102RGTT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ76PL102RGTT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BQ76PL102RGTT reliable?
The price and inventory of BQ76PL102RGTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ76PL102RGTT is usually 5 days.
3.What payment methods are accepted for BQ76PL102RGTT?
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BQ76PL102RGTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ76PL102RGTT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BQ76PL102RGTT?
For technical support, including BQ76PL102RGTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ76PL102RGTT requirements.
6.How does Aetrix verify that BQ76PL102RGTT is sourced from the original manufacturer or authorized distributors?
All BQ76PL102RGTT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BQ76PL102RGTT meets industry standards.
7.What is the process for return or replacement of BQ76PL102RGTT?
All BQ76PL102RGTT units undergo pre-shipment inspection (PSI). If there is an issue with BQ76PL102RGTT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BQ76PL102RGTT part is unused and in its original packaging.
Return procedure for BQ76PL102RGTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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