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Texas Instruments BQ29311PWR
- Part No.:
- BQ29311PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ29311PWR.pdf
- Description:
- IC BATT PROT LI-ION 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,354
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Product details
Overview
BQ29311PWR from Texas Instruments is a 3- or 4-cell Li-ion battery pack protection analog front-end (AFE) IC with integrated 3.3-V/25-mA LDO, I²C-compatible interface, autonomous overcurrent/short-circuit protection, and programmable cell balancing control. It delivers individual cell voltage monitoring (via VCELL output), drives three external FETs (DSG, CHG, PCHG), and supports notebook computer battery packs requiring precise safety supervision.
For engineers reviewing the BQ29311PWR datasheet, BQ29311PWR pinout, BQ29311PWR application, or BQ29311PWR equivalent, this device serves as a programmable, host-controlled AFE for high-reliability lithium-ion battery management systems where configurable protection thresholds, low-quiescent-current operation (140 µA typ), and cell-level telemetry are critical.
Technical Context
The BQ29311PWR implements dual-layer protection logic: host-initiated control via I²C registers (e.g., OCVD, SCV, SDV) and autonomous hardware-triggered responses (e.g., DSG/CHG FET shutdown on overcurrent). Its internal 32.768-kHz oscillator (±13% tolerance) or external CLKIN input governs timing for programmable delays (OCD: 1–31 ms; SCD: 0–915 µs).
Cell voltage sensing uses a precision scaling amplifier (K = 0.150 ±0.006) to generate GND-referenced VCELL outputs (0.3–0.975 V) inversely proportional to VCn–VC(n+1); cell selection and balance discharge are controlled via CELL_SELECT register bits b4–b7, with discharge current limited to ≤10 mA per cell by external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Support | 3- or 4-cell Li-ion series configuration; VC1–VC5 terminals support full stack sensing and balancing |
| VREG Output | 3.3 V ±5% at up to 25 mA; powers host MCU and interface logic; requires 1-µF ceramic capacitor |
| Supply Current | 140 µA typical (ICC1) in active mode; drops to 1 µA (ICC2) in sleep mode during shutdown |
| Protection Thresholds | Programmable: Overcurrent (50–205 mV), Short-Circuit (100–475 mV), Brownout (7.975–12.475 V), Shutdown (6.475–10.975 V) |
| I²C Interface | Slave-only, 7-bit address 0x20; open-drain SCLK/SDATA with 10-kΩ internal pullups; supports read/write to 9 registers |
| FET Drive Outputs | DSG/CHG: 1–7 V push-pull; PCHG: 3.3–11.5 V push-pull; all clamped to prevent gate overstress |
| Operating Temp | −25°C to +85°C ambient; validated for notebook battery pack thermal environments |
Pinout & Package
TSSOP-24 (PW) package: 7.8 mm × 4.4 mm, 0.65 mm pitch, thermally enhanced with exposed pad (not electrically connected). Pin 1 = VCC; Pin 11/13 = GND; Pin 19 = VREG; Pin 24 = VPACK.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (1) | Primary power input | Diode-protected BAT+ terminal; ORed with VPACK to supply internal regulator and logic |
| VC1–VC5 (3–7) | Cell voltage sense inputs | Enable differential measurement of 4-series cells; VC1–VC4 for cell voltages, VC5 for reference return |
| SR1/SR2 (8–9) | Current sense inputs | Detect charge/discharge current polarity and magnitude for overcurrent/short-circuit protection |
| DSG (23), CHG (21), PCHG (22) | External FET gate drivers | Push-pull outputs controlling discharge, charge, and precharge FETs; PCHG enables 0-V charging |
| SCLK/SDATA (14–15) | I²C interface signals | Open-drain bidirectional bus lines with internal 10-kΩ pullups to VREG; compatible with standard I²C timing |
| XALERT (17) | Status interrupt output | Open-drain alert indicating STATUS register changes (e.g., BRWO, SHDN, OC/SC events); 100-kΩ pullup to VREG |
| CNTL (10) | Global FET enable/disable | Active-low input; floating or pulled high disables all FET outputs; pulled low enables host/software control |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous hardware protection | Immediate DSG/CHG shutdown on overcurrent/short-circuit without host intervention; blanking delays prevent false triggers |
| Programmable cell balancing | Per-cell discharge control via CELL_SELECT register; max 10 mA/cell set by external resistor; balances voltage drift across aging cells |
| Integrated 3.3-V LDO | Self-powered regulation from battery stack; eliminates need for external bias supply; stable with 1-µF output capacitor |
| I²C telemetry interface | Reads real-time cell voltages, protection status, and fault history; writes thresholds, delays, and control states for system-level adaptability |
| Precharge FET control (PCHG) | Enables safe zero-volt charging and conditioning; clamped output prevents overvoltage during low-pack-voltage startup |
Applications
| Notebook Computer Battery Packs | Test Equipment Battery Modules |
|---|---|
Use Scenario: Integrated into multi-cell Li-ion packs for portable computing devices requiring UL/IEC 62133 compliance and field-upgradable protection logic. IC Role / Device Role / Timing Role: Primary AFE supervising cell voltages, current paths, and thermal conditions; provides VCELL telemetry and FET gate drive signals. Use Value: Enables host MCU to implement dynamic charge algorithms, detect cell imbalance early, and enforce strict overvoltage/undervoltage limits per cell. |
Use Scenario: Used in benchtop battery test systems where programmable protection thresholds and real-time cell voltage logging are required. IC Role / Device Role / Timing Role: Standalone safety monitor interfacing with test controller via I²C; measures VCn–VC(n+1) differentials and reports faults via XALERT. Use Value: Eliminates need for external ADCs and discrete comparators; reduces BOM count while supporting custom delay and threshold configurations per test profile. |
| Industrial Portable Tools | Medical Portable Devices |
Use Scenario: Deployed in cordless power tool battery packs subject to high pulse currents and wide temperature swings. IC Role / Device Role / Timing Role: Hardware-enforced overcurrent/short-circuit protection layer; autonomously cuts off DSG/CHG within microseconds when SR1/SR2 thresholds exceeded. Use Value: Prevents MOSFET failure during motor stall events; programmable OCD/SCD delays accommodate legitimate high-current bursts without nuisance tripping. |
Use Scenario: Embedded in certified medical battery packs where fail-safe shutdown and traceable fault logging are mandated. IC Role / Device Role / Timing Role: Safety-critical AFE providing brownout detection (BRWO), shutdown (SHDN), and cell-level voltage validation before device activation. Use Value: Ensures battery remains within safe operating envelope prior to powering life-support subsystems; STATUS register bits provide auditable fault history. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection AFE applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29330PW | Supports 5-cell stacks; adds integrated thermistor ADC and enhanced EEPROM-based configuration storage | Required for >4-cell packs or designs needing nonvolatile parameter retention across power cycles | Select BQ29330PW only if 5-cell support or EEPROM-backed settings are mandatory; otherwise BQ29311PWR offers lower cost and identical 3/4-cell functionality |
| MP2617GQ-Z | Monolithic single-chip solution with integrated charge FETs and buck charger; no external FET requirement | Suitable for compact, low-component-count battery modules where integrated power switching is acceptable | Choose MP2617GQ-Z for space-constrained designs accepting fixed FET RDS(on); BQ29311PWR retains flexibility with discrete high-current FET selection |
Compared with BQ29330PW and MP2617GQ-Z, the BQ29311PWR provides optimal balance of configurability, external FET scalability, and proven reliability in 3-/4-cell notebook battery applications-without added complexity or cost of extra cells or integrated power stages.
Availability
BQ29311PWR is available at Aetrix Electronics and suitable for notebook computer battery packs, industrial portable tools, and medical portable devices requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for BQ29311PWR 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.
The BQ29311PWR belongs to TI's bq™ battery monitor and protector product line, designed specifically for high-accuracy, programmable safety supervision of multi-cell lithium-ion battery packs in portable computing and industrial applications.
FAQ
What is the primary function of the BQ29311PWR in a battery management system?
The BQ29311PWR serves as an analog front-end protection IC for 3- or 4-cell Li-ion battery packs. It monitors individual cell voltages (via VC1–VC5), detects overcurrent/short-circuit events using SR1/SR2, controls external FETs (DSG, CHG, PCHG), provides a 3.3-V LDO, and communicates telemetry via I²C. The BQ29311PWR ensures safety compliance while enabling host-driven adaptive protection strategies.
Does the BQ29311PWR support both charge and discharge overcurrent protection?
Yes, the BQ29311PWR supports independent programmable thresholds for charge overcurrent (OCVC register, 50–205 mV) and discharge overload (OCVD register, −50 to −205 mV), each with configurable blanking delays (OCD register, 1–31 ms). Detection triggers immediate DSG or CHG FET shutdown and sets corresponding bits (OCCHG/OCDSG) in the STATUS register.
How does the BQ29311PWR handle cell voltage measurement and scaling?
The BQ29311PWR converts each cell's differential voltage (VCn–VC(n+1)) into a GND-referenced analog output at VCELL using a precision scaling amplifier with K = 0.150 ±0.006. The output is inversely proportional: VCELL = −K × (VCn–VC(n+1)) + 0.975 V. CELL_SELECT register bits b0–b1 select which cell is measured, enabling host MCU to scan all cells sequentially.
Can the BQ29311PWR operate without an external microcontroller?
The BQ29311PWR provides autonomous hardware-level protection (e.g., immediate FET shutdown on overcurrent), but full functionality-including cell balancing, threshold programming, status reading, and brownout/shutdown response-requires an I²C host controller. The CNTL pin must be pulled low to enable FET control; without host interaction, the BQ29311PWR remains in safe default state (all FETs off).
What is the role of the PCHG output on the BQ29311PWR?
The PCHG output on the BQ29311PWR drives the gate of an external precharge FET to enable safe zero-volt charging and low-voltage conditioning. It operates in clamp mode (3.5 V typical when VPACK = 3.8–5.25 V) or linear mode (≈2/3 × VPACK above 5.25 V). Unlike DSG/CHG, PCHG remains active during overcurrent events to maintain controlled current flow.
BQ29311PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- -
- Fault Protection:
- Over Current, Over/Under Voltage, Short Circuit
- Interface:
- I2C
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
BQ29311PWR FAQ
1.How can I place an order for BQ29311PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29311PWR 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 BQ29311PWR reliable?
The price and inventory of BQ29311PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29311PWR is usually 5 days.
3.What payment methods are accepted for BQ29311PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29311PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ29311PWR?
BQ29311PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29311PWR 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 BQ29311PWR?
For technical support, including BQ29311PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29311PWR requirements.
6.How does Aetrix verify that BQ29311PWR is sourced from the original manufacturer or authorized distributors?
All BQ29311PWR 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 BQ29311PWR meets industry standards.
7.What is the process for return or replacement of BQ29311PWR?
All BQ29311PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ29311PWR, 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 BQ29311PWR part is unused and in its original packaging.
Return procedure for BQ29311PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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