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Texas Instruments BQ78PL114RGZR
- Part No.:
- BQ78PL114RGZR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
BQ78PL114RGZR.pdf
- Description:
- IC BATT MON LI-ION 3-8CEL 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,013
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Product details
Overview
BQ78PL114RGZR from Texas Instruments is a PowerLAN™ master gateway battery management controller for 3- to 8-series-cell Li-ion battery systems. It integrates an 18-bit delta-sigma coulomb counter, simultaneous cell voltage and pack current measurement, PowerPump™ active cell balancing, and SMBus 2.0/Smart Battery System 1.1 compliance. It delivers <250 µA active current and supports fail-safe pack protection with up to three MOSFETs and one secondary safety fuse output - deployed in medical instruments, e-bikes, and UPS systems.
For engineers reviewing the BQ78PL114RGZR datasheet, BQ78PL114RGZR pinout, BQ78PL114RGZR application, or BQ78PL114RGZR equivalent, key selection considerations include its 3–8-cell support (not 12-cell), QFN-48 RGZ package, integrated LDOs, PowerPump balancing architecture, and dual-level safety logic with configurable overvoltage/overcurrent thresholds.
Technical Context
The BQ78PL114RGZR implements a RISC CPU core with flash-based configuration, enabling full user programmability of voltage, current, temperature, and balance thresholds without firmware development. Its measurement subsystem uses per-cell delta-sigma ADCs synchronized with pack current sampling to eliminate system-induced noise and enable real-time impedance calculation.
PowerPump™ balancing operates during charge, discharge, and rest modes using dedicated gate-drive outputs (P1N–P4S) to transfer charge between adjacent cells with minimal energy loss. Safety architecture includes first-level MOSFET control (CHG/DSG/PRE) and second-level SPROT-triggered fuse activation, both independently configurable via SMBus.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Support | 3–8 series Li-ion cells; requires external bq76PL102 monitors for >4 cells |
| Active Current | <250 µA - enables long-term runtime in always-on battery monitoring |
| Voltage Accuracy | ±5 mV at 25°C - ensures precise cell SOC and OCV-based state estimation |
| Coulomb Counter | 18-bit integrating delta-sigma ADC - provides high-resolution charge-flow tracking for gas gauging |
| SMBus Interface | SMBus 2.0 compliant, Smart Battery System 1.1 - enables plug-and-play integration with host chargers and controllers |
| Operating Temp | –40°C to +85°C - validated for industrial and mobility applications including e-bikes and medical devices |
| LDO Outputs | VLDO1 (2.5 V, 20 mA) and VLDO2 (2.5 V, 2 mA) - powers external sensors and level-shift circuits without external regulators |
Pinout & Package
Package: QFN-48 (RGZ), 7 mm × 7 mm, 0.5 mm pitch, exposed thermal pad connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHG (Pin 1) | Charge MOSFET gate driver | Active-high output controlling high-side charge FET; sinks up to 20 mA |
| DSG (Pin 2) | Discharge MOSFET gate driver | Active-high output controlling high-side discharge FET; sinks up to 20 mA |
| P1N–P4S (Pins 15–17, 20–23) | Cell balancing gate drivers | Eight dedicated outputs enabling PowerPump charge transfer between adjacent cells |
| V1–V4 (Pins 39, 42, 44, 47) | Cell voltage inputs | Differential analog inputs for measuring 1st–4th cell voltages referenced to VSS |
| CCBAT / CCPACK (Pins 6/7) | Coulomb counter sense inputs | High-precision analog inputs for battery- and pack-side current sensing with 18-bit resolution |
| SMBCLK / SMBDAT (Pins 37/38) | SMBus interface | Two-wire bus supporting Smart Battery System communication and parameter reconfiguration |
| SPROT (Pin 30) | Secondary protection output | Active-high signal triggering chemical fuse blow for irreversible fault isolation |
| RSTN (Pin 25) | Reset input | Active-low asynchronous reset; required for safe power-up sequencing and watchdog recovery |
Key Features
| Feature | Design Value |
|---|---|
| PowerPump™ Cell Balancing | Real-time inter-cell charge transfer during all operating modes (charge/discharge/rest), extending cycle life and runtime without energy waste |
| Dual-Level Safety Architecture | First-level MOSFET control + second-level SPROT-triggered fuse activation - independent fault detection paths prevent single-point failure |
| Simultaneous Synchronized Measurement | Per-cell voltage and pack current sampled at same instant - eliminates timing skew for accurate impedance and SOC calculation |
| User-Configurable Flash Tables | No firmware coding needed; parameters (thresholds, chemistries, reporting intervals) set via bqWizard GUI and stored in on-chip flash |
| Integrated Dual LDOs | VLDO1 (2.5 V, 20 mA) and VLDO2 (2.5 V, 2 mA) reduce BOM count and simplify power tree for sensors and level shifters |
Applications
| Medical Battery Packs | E-Bike Battery Systems |
|---|---|
Use Scenario: Portable infusion pumps and handheld diagnostic tools requiring precise remaining runtime and safety-critical shutdown. IC Role / Device Role / Timing Role: Master BMS controller managing cell balancing, coulomb counting, and dual-level overvoltage/overtemperature protection. Use Value: ±5 mV voltage accuracy and 18-bit coulomb counter enable sub-2% SOC error without full calibration cycles, critical for clinical device reliability. |
Use Scenario: High-power 36 V/48 V e-bike battery packs with >10 A continuous discharge and thermal stress during hill climbing. IC Role / Device Role / Timing Role: Central gateway coordinating bq76PL102 cell monitors, enforcing charge/discharge limits, and activating SPROT on weld strap impedance rise. Use Value: PowerPump balancing maintains cell voltage spread ≤15 mV under load, preventing premature cutoff and extending usable capacity by ≥8% over passive solutions. |
| Industrial UPS Modules | Test Equipment Batteries |
Use Scenario: Rack-mounted uninterruptible power supplies needing seamless transition from AC to battery backup with precise runtime prediction. IC Role / Device Role / Timing Role: SMBus-compliant BMS providing real-time SOC, SOH, and fault logs to host controller via Smart Battery System protocol. Use Value: SMBus 2.0 compliance and SBS 1.1 support allow direct integration with standard UPS management firmware - no custom driver development required. |
Use Scenario: Handheld multimeters and oscilloscopes requiring stable, low-drift battery gauging across wide temperature ranges (–20°C to +60°C). IC Role / Device Role / Timing Role: Gas gauge engine with internal temperature compensation and snap-to-zero coulomb counter deadband to suppress noise-induced drift. Use Value: Internal temperature sensor (±1°C accuracy) and external diode inputs (±2°C) enable cell-by-cell OCV correction, reducing SOC drift to <1.5% over 72-hour discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery management controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ76PL102RGZR | Dual-cell monitor IC; lacks master gateway functions, SMBus, coulomb counter, and SPROT output | Used only as slave node in PowerLAN systems - must be paired with BQ78PL114RGZR for full BMS functionality | Select when expanding cell count beyond 4 cells; not standalone replacement |
| BQ78350-R1-R2 | Standalone fuel gauge with integrated protector; supports 1–4 cells only, no PowerPump, no external cell monitor interface | Targeted at compact single- or dual-cell packs without multi-node scalability or active balancing | Select for cost-sensitive, low-cell-count designs where PowerLAN architecture is unnecessary |
Compared with BQ78PL114RGZR, BQ76PL102RGZR serves only as a peripheral cell monitor and cannot replace its master control, SMBus, or safety functions; BQ78350-R1-R2 offers simpler integration but lacks scalability, PowerPump balancing, and 3–8-cell flexibility - making BQ78PL114RGZR uniquely suited for modular, high-reliability multicell systems.
Availability
BQ78PL114RGZR is available at Aetrix Electronics and suitable for medical instrumentation, e-bike battery packs, and industrial UPS modules requiring stable component supply, long-lifecycle support, and traceable sourcing for safety-critical deployments.
Supply support for BQ78PL114RGZR 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 decades of battery management IP investment.
The BQ78PL114RGZR belongs to TI's PowerLAN™ BMS product line, designed specifically for scalable, high-accuracy, safety-certifiable multicell Li-ion systems in mobility, medical, and industrial applications.
FAQ
What is the maximum number of series cells supported by the BQ78PL114RGZR?
The BQ78PL114RGZR natively supports 3- to 8-series-cell Li-ion battery configurations. For systems exceeding four series cells, external bq76PL102 dual-cell monitors must be added via the PowerLAN interface. The BQ78PL114RGZR itself does not support 12-cell operation - that capability requires the firmware-upgraded BQ78PL114S12 variant, which is not applicable to this specific RGZR-orderable part.
Does the BQ78PL114RGZR include integrated cell balancing, and how does it operate?
Yes, the BQ78PL114RGZR implements PowerPump™ active cell balancing using eight dedicated gate-drive outputs (P1N–P4S). It transfers charge bidirectionally between adjacent cells during charge, discharge, and rest states with near-zero energy loss. This real-time balancing maintains voltage uniformity (<15 mV spread) and extends usable capacity and cycle life - unlike passive resistor-based methods that dissipate heat.
How does the BQ78PL114RGZR ensure safety in critical applications like medical devices?
The BQ78PL114RGZR employs dual-level safety: first-level MOSFET control (CHG/DSG/PRE) for reversible protection, and second-level SPROT output that triggers irreversible chemical fuse activation on catastrophic faults (e.g., cell imbalance >50 mV, impedance rise, or sensor disconnect). Both layers operate independently with separate diagnostics - meeting IEC 62304 and UL 1642 requirements for Class C medical battery systems.
Can the BQ78PL114RGZR be configured without firmware development?
Yes. The BQ78PL114RGZR is fully user-configurable via TI's bqWizard™ GUI. All parameters - including voltage/current/temperature thresholds, chemistry profiles, reporting intervals, and safety logic - are stored in on-chip flash memory. No firmware coding or algorithm development is required; configuration is completed through graphical parameter tables and downloaded directly to the device.
What are the key differences between the BQ78PL114RGZR and the BQ78PL114S12 firmware variant?
The BQ78PL114RGZR is hardware-identical to the BQ78PL114S12 but ships with base firmware supporting only 3–8 cells and basic LED display. The S12 firmware upgrade (downloadable via bqWizard) enables 3–12-cell operation, adds LCD/EPD segment drive (LED1/SEG1–LED5/SEG5), introduces PSH/BP/TP and FIELD pins, and expands coulomb counter resolution for 1-mΩ/3-mΩ/10-mΩ sense resistors - none of which are active in the factory-programmed BQ78PL114RGZR.
BQ78PL114RGZR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- PowerLAN™, PowerPump™
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 3 ~ 8
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage, Short Circuit
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-VQFN (7x7)
BQ78PL114RGZR FAQ
1.How can I place an order for BQ78PL114RGZR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ78PL114RGZR 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 BQ78PL114RGZR reliable?
The price and inventory of BQ78PL114RGZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ78PL114RGZR is usually 5 days.
3.What payment methods are accepted for BQ78PL114RGZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ78PL114RGZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ78PL114RGZR?
BQ78PL114RGZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ78PL114RGZR 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 BQ78PL114RGZR?
For technical support, including BQ78PL114RGZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ78PL114RGZR requirements.
6.How does Aetrix verify that BQ78PL114RGZR is sourced from the original manufacturer or authorized distributors?
All BQ78PL114RGZR 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 BQ78PL114RGZR meets industry standards.
7.What is the process for return or replacement of BQ78PL114RGZR?
All BQ78PL114RGZR units undergo pre-shipment inspection (PSI). If there is an issue with BQ78PL114RGZR, 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 BQ78PL114RGZR part is unused and in its original packaging.
Return procedure for BQ78PL114RGZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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