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Texas Instruments BQ29311PWG4
- Part No.:
- BQ29311PWG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ29311PWG4.pdf
- Description:
- IC BATT PROT LI-ION 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,802
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Product details
Overview
BQ29311PWG4 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 voltages to host controllers and drives three external FETs for charge/discharge/precharge control in notebook battery packs.
For engineers reviewing the BQ29311PWG4 datasheet, BQ29311PWG4 pinout, BQ29311PWG4 application, or BQ29311PWG4 equivalent, key selection considerations include its 140 µA typical supply current, ±5% shutdown/brownout threshold accuracy, 50–205 mV programmable overcurrent detection range, 100–475 mV short-circuit threshold, and TSSOP-24 PW package with verified 24-pin terminal mapping.
Technical Context
The BQ29311PWG4 implements dual-level safety architecture: host-controlled protection via I²C registers (OCVD/OCVC/SCV/SDV) and autonomous hardware-triggered FET shutdown on overcurrent, short-circuit, overvoltage, or undervoltage events. Its VCELL output provides scaled (0.15×), inverted cell voltage representation referenced to GND.
Cell balancing is executed per-cell via internal discharge switches controlled by CELL_SELECT register bits b4–b7, with external series resistors limiting discharge current to ≤10 mA per cell. The integrated 3.3-V LDO supports host communication and peripheral biasing with ±1.74% total output variation across temperature and load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | 3- or 4-cell Li-ion series configuration; VC1–VC5 pins enable full stack sensing and balancing |
| Supply Current (Typ) | 140 µA - enables ultra-low-power battery monitoring during standby |
| LDO Output | 3.3 V ±5%, 25 mA max - powers host MCU, I²C interface, and thermistor/LED circuits |
| Overcurrent Threshold | 50–205 mV (5-mV steps) - sets discharge overload and charge overcurrent trip points |
| Short-Circuit Threshold | 100–475 mV (25-mV steps) - configurable fast-trip detection for fault currents |
| Shutdown Voltage Range | 6.475–10.975 V (300-mV steps) - disables regulator and FETs below critical pack voltage |
| Brownout Threshold | 7.975–12.475 V (300-mV steps) - asserts XALERT without disabling regulation |
| VCELL Scaling Factor | 0.144–0.156 - linearly maps 0–4.5 V differential cell voltage to 0.3–0.975 V GND-referenced output |
Pinout & Package
TSSOP-24 (PW) package: 7.8 mm × 4.4 mm, 0.65 mm pitch, exposed thermal pad (not electrically connected). Pin 1 = VCC; Pin 11/13 = GND; Pin 24 = VPACK; Pin 19 = VREG.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (1) | Diode-protected BAT+ input | Primary power source for internal circuitry; includes reverse-polarity protection |
| VC1–VC5 (3–7) | Cell voltage sense inputs | Enable differential measurement of up to four series cells; VC1–VC4 are positive terminals, VC5 is most-negative reference |
| SR1/SR2 (8–9) | Current sense differential pair | Detects charge/discharge current direction and magnitude for OC/SC protection |
| DSG (23), CHG (21), PCHG (22) | Push-pull FET gate drivers | Drive external N-channel MOSFETs for discharge, charge, and precharge paths respectively |
| SCLK/SDATA (14–15) | I²C-compatible serial interface | Open-drain bidirectional bus with 10-kΩ internal pullups to VREG; slave address 0x20 |
| XALERT (17) | Status change indicator | Open-drain output pulled high by internal 100-kΩ resistor; asserts on BRWO, SHDN, OC, or SC events |
| CNTL (10) | Global FET enable/disable | Active-low input; floating or pulled high disables all FET outputs regardless of register state |
| VCELL (12) | Scaled cell voltage output | Analog output proportional to selected cell's voltage (0.15×), inverted and offset for ADC interfacing |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Protection Thresholds | Independent 5-mV-step overcurrent and 25-mV-step short-circuit thresholds for charge/discharge paths |
| Autonomous Hardware Safety | Dedicated analog comparators trigger immediate DSG/CHG shutdown without host intervention during faults |
| Integrated Cell Balancing Control | Per-cell discharge switching via CELL_SELECT register; external resistor sets ≤10 mA/cell current |
| I²C-Compatible Host Interface | 7-bit slave address 0x20; supports read/write to nine registers including STATUS, CONTROL, OCVD, SCV, SDV |
| Precharge Mode Management | PCHG output clamps to 3.5 V at low VPACK (3.8–5.25 V); scales to 2/3×VPACK above 5.25 V |
| Thermistor & LED Bias Outputs | TOUT provides 1 mA bias current (50–100 Ω series impedance); LEDOUT sources −25 mA at 2.9–3.46 V |
Applications
| Notebook Computer Battery Packs | Test Equipment Power Modules |
|---|---|
Use Scenario: Multi-cell Li-ion battery pack in portable computing devices requiring precise cell voltage monitoring and fail-safe protection. IC Role / Device Role / Timing Role: Analog front-end AFE providing real-time cell voltage translation, overcurrent/short-circuit detection, and FET gate drive control. Use Value: Enables host MCU to implement adaptive charging algorithms while guaranteeing hardware-level shutdown under fault conditions exceeding 205 mV OC or 475 mV SC thresholds. | Use Scenario: Rechargeable battery-powered test instrumentation needing stable, low-quiescent-current power supervision. IC Role / Device Role / Timing Role: Protection controller managing pack-level safety, brownout signaling, and thermistor-based temperature monitoring via TOUT. Use Value: Delivers 140 µA typical operating current and programmable 6.475–10.975 V shutdown threshold to extend runtime and prevent deep discharge damage. |
| Industrial Portable Tools | Medical Handheld Devices |
Use Scenario: High-power cordless power tools with 3- or 4-cell Li-ion packs subject to high transient discharge currents. IC Role / Device Role / Timing Role: Fault detector and FET driver enforcing <10 µs response to short-circuit events via hardware-comparator path. Use Value: Supports 1–31 ms programmable OC delay and 0–915 µs SCD delay to distinguish inrush from true faults while maintaining sub-100 µs hardware trip latency. | Use Scenario: Battery-backed medical diagnostics equipment requiring reliable, low-risk power management with status alerting. IC Role / Device Role / Timing Role: Safety monitor generating XALERT pulses on brownout (BRWO) or shutdown (SHDN) events for host system logging. Use Value: Provides ±5% threshold accuracy and 35–65 mV hysteresis on both brownout and shutdown monitors to prevent chatter during voltage recovery. |
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 | Same PW package; adds integrated 5-V LDO and enhanced I²C timing compliance; no VCELL scaling | Requires external ADC for cell voltage; better suited for systems needing higher-voltage bias rails | Select BQ29330PW when 5-V peripheral biasing is required and VCELL analog output is unnecessary |
| MAX11060GBC+ | 12-bit ADC + protection AFE in 32-pin TQFN; measures all cells simultaneously; no integrated LDO | Higher precision (±0.5% cell voltage accuracy) but requires external 3.3-V regulator and more complex layout | Select MAX11060GBC+ when simultaneous multi-cell sampling and <1% voltage measurement error are mandatory |
Compared with BQ29311PWG4, BQ29330PW offers extended LDO capability but removes the VCELL analog scaling function, while MAX11060GBC+ delivers superior measurement fidelity at the cost of increased BOM count and layout complexity.
Availability
BQ29311PWG4 is available at Aetrix Electronics and suitable for notebook computer battery packs, industrial portable tools, and medical handheld devices requiring stable component supply with long-term lifecycle support.
Supply support for BQ29311PWG4 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 company specializing in analog and embedded processing technologies, with leadership in power management and battery solutions.
The BQ29311PWG4 belongs to TI's battery protection AFE product line, designed specifically for high-reliability, multi-cell Li-ion pack safety monitoring and host-controlled protection in portable computing and industrial applications.
FAQ
What is the primary function of the BQ29311PWG4 in a battery management system?
The BQ29311PWG4 serves as a 3- or 4-cell Li-ion battery pack protection analog front-end (AFE), providing autonomous overcurrent/short-circuit detection, programmable shutdown/brownout monitoring, cell voltage translation via VCELL output, and drive signals for three external FETs. It interfaces with a host controller via I²C to deliver real-time status and accept configuration updates, making the BQ29311PWG4 essential for safety-critical battery supervision in portable electronics.
How does the BQ29311PWG4 handle cell balancing, and what external components are required?
The BQ29311PWG4 enables per-cell passive balancing through internal discharge switches controlled by the CELL_SELECT register (bits b4–b7). Each cell's balance current is limited by an external series resistor connected between VCn and the cell's positive terminal, with absolute maximum current set to 10 mA per cell. No active balancing circuitry is integrated - the BQ29311PWG4 provides only the switch control and relies on external resistors to define discharge rate and power dissipation.
What are the voltage thresholds and accuracy specifications for shutdown and brownout detection in the BQ29311PWG4?
The BQ29311PWG4 features programmable shutdown (VSD) and brownout (VBO) thresholds set via the SDV register. Shutdown range is 6.475–10.975 V in 300-mV steps with ±5% accuracy at the falling edge and 35–65 mV hysteresis. Brownout range is 7.975–12.475 V, also in 300-mV steps, with identical ±5% accuracy and hysteresis. These thresholds are measured at the VBAT pin and determine when the device enters sleep mode (SHDN) or asserts XALERT (BRWO).
Can the BQ29311PWG4 operate without an external microcontroller, and what autonomous protections does it provide?
Yes, the BQ29311PWG4 provides autonomous hardware-level protection independent of host communication: overcurrent, short-circuit, overvoltage, and undervoltage conditions trigger immediate DSG/CHG/PCHG FET control without I²C interaction. While full configurability (thresholds, delays, balancing) requires a host MCU, the BQ29311PWG4 will still enforce safety shutdowns using default register values - making the BQ29311PWG4 viable in minimal-system designs where basic protection suffices.
What is the role of the VCELL pin on the BQ29311PWG4, and how is its output calibrated?
The VCELL pin outputs a GND-referenced, scaled version of the selected cell's voltage: VCELL = −K × V(CELL_IN) + 0.975 V, where K = 0.144–0.156. This allows direct ADC measurement without level-shifting. Calibration involves measuring two VCELL outputs under known conditions (CAL1/CAL2 modes), calculating actual K and input offset, then applying correction in firmware. The BQ29311PWG4 provides dedicated calibration registers (CAL1/CAL2/VM0/VM1) and procedure guidance in the datasheet to achieve <1% cell voltage measurement error.
BQ29311PWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
BQ29311PWG4 FAQ
1.How can I place an order for BQ29311PWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29311PWG4 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 BQ29311PWG4 reliable?
The price and inventory of BQ29311PWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29311PWG4 is usually 5 days.
3.What payment methods are accepted for BQ29311PWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29311PWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ29311PWG4?
BQ29311PWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29311PWG4 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 BQ29311PWG4?
For technical support, including BQ29311PWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29311PWG4 requirements.
6.How does Aetrix verify that BQ29311PWG4 is sourced from the original manufacturer or authorized distributors?
All BQ29311PWG4 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 BQ29311PWG4 meets industry standards.
7.What is the process for return or replacement of BQ29311PWG4?
All BQ29311PWG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ29311PWG4, 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 BQ29311PWG4 part is unused and in its original packaging.
Return procedure for BQ29311PWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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