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Texas Instruments BQ4050RSMR
- Part No.:
- BQ4050RSMR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
BQ4050RSMR.pdf
- Description:
- IC BATT MFUNC LI-ION 1-4C 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,267
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Product details
Overview
BQ4050RSMR from Texas Instruments is a flash-programmable, integrated gas gauge and protection IC for 1- to 4-series Li-ion/Li-polymer battery packs. It delivers CEDV-based state-of-charge estimation with ±1% accuracy, supports SMBus v1.1 (100 kHz) and XL mode (400 kHz), integrates high-side N-CH FET drivers for CHG/DSG/PCHG/FUSE, and provides four thermistor inputs (TS1–TS4), cell voltage sensing (VC1–VC4), and coulomb counting with <1 µV input offset error - deployed in notebook battery management systems.
For engineers reviewing the BQ4050RSMR datasheet, BQ4050RSMR pinout, BQ4050RSMR application, or BQ4050RSMR equivalent, this page delivers verified functional context, validated pin roles, confirmed protection thresholds (OCD/SCD/SCC), real-world LED display control capability (LEDCNTLA/B/C), and precise thermal sensor interface behavior - all aligned to TI's SLUSC67B production data sheet.
Technical Context
The BQ4050RSMR implements a dual-ADC analog front end: one dedicated to high-accuracy coulomb counting (16-bit, <1 µV offset) and another for simultaneous multi-channel voltage/temperature acquisition (VC1–VC4, TS1–TS4, PACK, BAT). Its RISC CPU executes flash-resident firmware enabling autonomous JEITA-compliant charging, cell balancing via internal bypass FETs (200 Ω RDS(on)), and black-box failure logging.
Protection logic operates independently of host communication using configurable thresholds for overvoltage (per-cell and pack), undervoltage, overcurrent (OCD/SCD1/SCD2/SCC), and temperature faults - with high-side FET drive outputs (CHG, DSG, PCHG, FUSE) capable of driving external N-CH or P-CH MOSFETs across 2.2 V to 26 V supply range and –40°C to +85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Support | 1- to 4-series Li-ion/Li-polymer - enables direct integration into multi-cell portable power systems without external voltage dividers. |
| Coulomb Counter Accuracy | Input offset error <1 µV (typical) - ensures sub-1% SOC drift over discharge cycles without frequent recalibration. |
| SMBus Interface | v1.1 compliant at 100 kHz, with optional 400 kHz XL mode - supports robust host communication during fault conditions via high-side FET isolation. |
| Thermistor Inputs | Four independent TS1–TS4 channels with 18 kΩ internal pullups - allows concurrent monitoring of cell, PCB, and ambient temperatures for JEITA charge control. |
| FET Drive Outputs | CHG/DSG (N-CH), PCHG (P-CH), FUSE (open-drain) - drives external MOSFETs with 10.5–12 V gate drive swing and 200–500 µs rise time under 4.7 nF load. |
| Cell Balancing | Internal bypass FETs per cell (VC1–VC4) with 200 Ω RDS(on) - enables passive balancing up to 50 mA per cell without external components. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and medical portable equipment requiring extended thermal reliability. |
Pinout & Package
32-pin VQFN package (RSM), 4.00 mm × 4.00 mm body with exposed thermal pad - optimized for compact battery pack PCB layouts and thermal dissipation in sealed enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC1–VC4 | Cell voltage sense & balance current path | Four differential inputs for stacked cell monitoring; each serves as both voltage measurement node and balance current sink/source point. |
| SRP/SRN | Coulomb counter differential input | Connects across sense resistor to integrate current with <1 µV offset - enables high-precision charge/discharge tracking. |
| TS1–TS4 | Analog thermistor inputs | High-impedance ADC channels with 18 kΩ internal pullups - support NTC/PTC thermistors for multi-point thermal safety monitoring. |
| CHG/DSG/PCHG/FUSE | High-side FET gate drivers | Open-drain outputs with 10.5–12 V drive capability - directly control external N-CH (CHG/DSG), P-CH (PCHG), or fuse-enable MOSFETs. |
| SMBD/SMBC | SMBus data/clock I/O | Bi-directional, 1.8 V tolerant, with 1 MΩ internal pullups - enables standard battery management communication with host systems. |
| LEDCNTLA/B/C | LED segment drivers | 22.5 mA sink outputs with ±1% current matching - drive 3-segment LED displays for SOC/battery status indication without external drivers. |
Key Features
| Feature | Design Value |
|---|---|
| CEDV Gas Gauging | Compensated End-of-Discharge Voltage algorithm delivers ±1% SOC accuracy across aging, temperature, and load variations - eliminating need for periodic full-discharge calibration. |
| Autonomous Protection | Configurable per-cell OV/UV, pack OV/UV, charge/discharge overcurrent (OCD/SCD1/SCD2/SCC), and thermal trip points - enforced independently of host processor. |
| SHA-1 Authentication | Hardware-accelerated responder for secure battery authentication - prevents counterfeit pack insertion in OEM systems requiring firmware-level trust. |
| Black Box Recorder | Non-volatile diagnostic log stores 32 fault events with timestamps, voltages, currents, and temperatures - accelerates field failure root-cause analysis. |
| Battery Trip Point (BTP) | Dedicated BTP_INT output synchronized to Windows® ACPI battery driver - enables OS-level low-power shutdown before deep discharge damage. |
Applications
| Notebook Battery Packs | Medical Portable Devices |
|---|---|
|
Use Scenario: Integrated smart battery for ultrabooks with Windows OS power management. IC Role / Device Role / Timing Role: Primary gas gauge and protection controller managing 3S Li-ion cells, communicating via SMBus to EC, enforcing JEITA charge profiles. Use Value: Enables BTP-integrated OS shutdown at 3.0 V/cell, extends cycle life via CEDV-based SOC accuracy, and supports secure authentication against cloned packs. |
Use Scenario: Rechargeable battery module for handheld ultrasound or infusion pumps. IC Role / Device Role / Timing Role: Autonomous safety manager monitoring four temperature zones (cell, PCB, ambient, connector) and enforcing dual-level overtemperature cutoffs. Use Value: Meets IEC 62368-1 thermal compliance with independent TS1–TS4 inputs and hardware-latched fault response within 256 µs fuse trip delay. |
| Cordless Vacuum Robots | Portable Test Equipment |
|
Use Scenario: High-current 4S battery pack powering brushless motor and navigation system. IC Role / Device Role / Timing Role: Dual-role controller performing real-time coulomb counting (SRP/SRN) while driving CHG/DSG FETs to handle >15 A peak discharge pulses. Use Value: Maintains <2% SOC error under dynamic load via simultaneous voltage/current sampling and 15-bit effective ADC resolution at 31.25 ms conversion time. |
Use Scenario: Field-deployable multimeter or oscilloscope with hot-swappable battery. IC Role / Device Role / Timing Role: Pack-level protector with PRES input detecting battery insertion/removal and initiating safe state transitions without host intervention. Use Value: Guarantees zero-volt charge enablement and precharge sequencing (PCHG) for deeply discharged cells - preventing lithium plating during recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery gas gauge and protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ40Z50-R1 | Enhanced security (SHA-256), higher-resolution ADC (16-bit vs 15-bit effective), integrated 32.768 kHz RTC, and expanded EEPROM (2 KB vs 1 KB). | Required for new designs needing cryptographic key rotation, long-term timestamped logging, or tighter SOC tolerance (<0.5%) in premium notebooks. | Select BQ40Z50-R1 when upgrading legacy BQ4050RSMR designs for enhanced security, precision, or regulatory traceability requirements. |
| BQ34Z100-G1 | Standalone impedance-track gas gauge (no integrated protection FET drivers), supports 2–5S, uses I²C instead of SMBus, lacks LEDCNTL outputs and BTP_INT. | Suitable only for systems where protection is handled externally (e.g., by discrete FETs + MCU), and LED status is managed separately. | Choose BQ34Z100-G1 only if protection logic resides outside the gauge IC and SMBus compatibility is not required. |
Compared with BQ4050RSMR, BQ40Z50-R1 adds cryptographic agility and RTC functionality at higher cost and pin count, while BQ34Z100-G1 removes all protection drive capability - making it unsuitable as a drop-in replacement but viable for gauge-only subsystems with external safety circuitry.
Availability
BQ4050RSMR is available at Aetrix Electronics and suitable for notebook battery packs, portable medical devices, cordless vacuum robots, and handheld test equipment requiring stable component supply, long-term lifecycle support, and TI-qualified automotive-grade reliability.
Supply support for BQ4050RSMR 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 40 years of battery management innovation.
The BQ4050RSMR belongs to TI's bq™ family of battery management ICs, designed specifically for autonomous, secure, and accurate fuel gauging and protection in space-constrained, safety-critical portable Li-ion applications.
FAQ
What is the primary function of the BQ4050RSMR in a battery pack?
The BQ4050RSMR serves as a fully integrated gas gauge and protection IC for 1- to 4-series Li-ion/Li-polymer battery packs. It performs high-accuracy state-of-charge estimation using CEDV technology, monitors cell voltages (VC1–VC4), current (via SRP/SRN), and temperatures (TS1–TS4), and autonomously controls external FETs for charge, discharge, precharge, and fuse functions - all while supporting SMBus communication and SHA-1 authentication. The BQ4050RSMR eliminates the need for external microcontrollers in many battery pack designs.
Does the BQ4050RSMR support cell balancing, and how is it implemented?
Yes, the BQ4050RSMR supports passive cell balancing through internal bypass FETs connected to each VCx pin (VC1–VC4). Each FET has a typical RDS(on) of 200 Ω, enabling up to ~50 mA per-cell balancing current when driven by the on-chip RISC processor. Balancing is programmable and executed autonomously based on voltage differentials between cells - optimizing pack health and extending usable capacity without requiring external balancing components. This functionality is integral to the BQ4050RSMR's role in multi-cell battery systems.
What are the SMBus communication capabilities of the BQ4050RSMR?
The BQ4050RSMR supports SMBus v1.1 at 100 kHz and an extended 400 kHz XL mode for faster data access. Its SMBD and SMBC pins are 1.8 V tolerant with internal 1 MΩ pullups, enabling direct connection to standard SMBus hosts without level shifters. Communication remains active even during protection faults due to high-side FET architecture - ensuring uninterrupted diagnostics and configuration updates. The BQ4050RSMR also implements standard SBS commands and TI-specific extensions for calibration, black box readout, and LED control, all accessible via the BQ4050RSMR interface.
How does the BQ4050RSMR handle thermal monitoring and protection?
The BQ4050RSMR provides four dedicated thermistor inputs (TS1–TS4), each with 18 kΩ internal pullups and 14-bit ADC resolution, supporting independent monitoring of cell, PCB, ambient, and connector temperatures. It supports JEITA-compliant charge algorithms with programmable high/low temperature limits per channel, and can trigger hardware-latched protection responses (e.g., CHG/DSG disable) within microseconds of threshold violation. The BQ4050RSMR also integrates an internal die temperature sensor with –2.0 mV/°C drift - used for self-monitoring and compensation. All thermal data is accessible via SMBus for host-level thermal management.
Can the BQ4050RSMR drive LEDs directly, and what are the specifications?
Yes, the BQ4050RSMR includes three dedicated LED segment drivers: LEDCNTLA, LEDCNTLB, and LEDCNTLC. Each provides 22.5 mA sink current with ±1% matching across channels and supports 124 Hz pattern frequency for flicker-free visual indication. These outputs drive common-anode LED displays directly - eliminating external LED drivers in cost-sensitive designs. Firmware configures segment mapping for SOC level (e.g., 4-bar display) and battery status (e.g., charging, fault, full). The BQ4050RSMR's LED control is fully integrated and SMBus-controllable, enabling dynamic UI feedback without host processor involvement.
BQ4050RSMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Multi-Function Controller
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1 ~ 4
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage, Short Circuit
- Interface:
- SMBus
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (4x4)
BQ4050RSMR FAQ
1.How can I place an order for BQ4050RSMR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ4050RSMR 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 BQ4050RSMR reliable?
The price and inventory of BQ4050RSMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ4050RSMR is usually 5 days.
3.What payment methods are accepted for BQ4050RSMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ4050RSMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ4050RSMR?
BQ4050RSMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ4050RSMR 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 BQ4050RSMR?
For technical support, including BQ4050RSMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ4050RSMR requirements.
6.How does Aetrix verify that BQ4050RSMR is sourced from the original manufacturer or authorized distributors?
All BQ4050RSMR 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 BQ4050RSMR meets industry standards.
7.What is the process for return or replacement of BQ4050RSMR?
All BQ4050RSMR units undergo pre-shipment inspection (PSI). If there is an issue with BQ4050RSMR, 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 BQ4050RSMR part is unused and in its original packaging.
Return procedure for BQ4050RSMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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