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Texas Instruments BQ29311PWRG4
- Part No.:
- BQ29311PWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ29311PWRG4.pdf
- Description:
- IC BATT PROT LI-ION 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,270
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Product details
Overview
BQ29311PWRG4 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 BQ29311PWRG4 datasheet, BQ29311PWRG4 pinout, BQ29311PWRG4 application, or BQ29311PWRG4 equivalent, this device supports precise voltage monitoring (±5% brownout/shutdown thresholds), configurable OC/SC detection (5–475 mV range), low-quiescent 140 µA supply current, and thermistor/LED drive functions - all critical for safe, adaptive battery management system design.
Technical Context
The BQ29311PWRG4 implements dual-level safety: 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 cell voltage monitor outputs scaled, inverted analog values (VCELL = −0.15 × Vcell + 0.975 V) with 0–4.5 V input range and ±5% accuracy after calibration.
It integrates a 3.3-V LDO with ±5% output tolerance, 20 mV line/load regulation, and programmable brownout (7.975–12.475 V) and shutdown (6.475–10.975 V) thresholds using the SDV register. The I²C slave interface uses fixed 7-bit address 0x20, supports read/write to nine registers, and features open-drain SCLK/SDATA with internal 10-kΩ pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | 3- or 4-series Li-ion cells - enables flexible pack architecture without redesign |
| VREG Output | 3.3 V ±5%, 25 mA max - powers host MCU or sensors directly from battery stack |
| Supply Current | 140 µA typical - extends battery standby life in always-on protection mode |
| OC/SC Threshold Range | Charge OC: 50–205 mV; Discharge OC: −50 to −205 mV; SC: ±100–475 mV - supports wide-range current-sense resistor selection |
| VCELL Scaling | −0.15 × Vcell + 0.975 V - provides GND-referenced analog output compatible with 0–3.3 V ADC inputs |
| I²C Address | 0x20 (7-bit) - ensures deterministic bus addressing in multi-device battery systems |
| Operating Temp | −25°C to +85°C - qualified for industrial and portable computing environments |
Pinout & Package
TSSOP-24 (PW) package with 0.65-mm pitch; exposed thermal pad not electrically connected; JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Diode-protected BAT+ input | Primary power source for internal circuitry; includes reverse-polarity protection |
| VPACK | Pack positive terminal | Alternate power source; ORed with VCC to enable regulator startup at low battery voltage |
| VBAT | Battery positive sense | Input for VREG shutdown and brownout monitoring; referenced to GND |
| VC1–VC5 | Cell voltage sensing chain | Five terminals for 4-cell stack monitoring (VC1–VC4) plus VC5 as bottom reference; support cell balancing discharge paths |
| SR1/SR2 | Current sense differential pair | SR1 = charge-side sense+, SR2 = discharge-side sense+; enables bidirectional overcurrent detection |
| DSG/CHG/PCHG | FET gate drivers | Push-pull outputs driving external discharge, charge, and precharge FETs; PCHG clamped to 3.5 V below 5.25 V VPACK |
| SCLK/SDATA | I²C interface | Open-drain bidirectional signals with internal 10-kΩ pullups to VREG; compatible with standard I²C timing |
| XALERT | Status interrupt output | Open-drain alert signal pulled up to VREG; asserts on OC/SC/brownout/shutdown events; cleared by STATUS register read |
| CNTL | Global FET enable | Active-low hardware override: pulling CNTL to GND enables FET control logic; floating or high disables all FETs |
| VCELL | Scaled cell voltage output | Analog output proportional to selected cell voltage; used for host ADC measurement without external scaling |
| TOUT/LEDOUT | Thermistor/LED bias | TOUT: 1-mA thermistor current source (50–100 Ω series resistance); LEDOUT: 25-mA constant-current LED driver |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Brownout & Shutdown | Independent 0.3-V-step thresholds (7.975–12.475 V brownout; 6.475–10.975 V shutdown) with ±5% accuracy and 50 mV hysteresis - prevents false triggers during transient load dips |
| Configurable Overcurrent Protection | Separate charge/discharge OC thresholds (50–205 mV) and delays (1–31 ms) - accommodates diverse FET RDS(on) and load profiles |
| Cell Balancing Control | Per-cell discharge path enabled via CELL_SELECT register; max 10 mA per cell with external resistor - corrects voltage drift across aging Li-ion cells |
| I²C-Compatible Host Interface | Fixed 0x20 slave address; 9-register map including STATUS, CONTROL, OCVD/OCVC, SCV, SDV - enables full runtime configuration without dedicated protocol engine |
| Precharge FET Drive (PCHG) | Voltage-clamped output (3.5 V @ VPACK < 5.25 V; 2/3 × VPACK otherwise) - safely conditions deeply discharged cells before main charging |
Applications
| Notebook Battery Pack Protection | Test Equipment Power Management |
|---|---|
Use Scenario: Protecting 3S/4S Li-ion packs in ultrabooks against overvoltage, undervoltage, overcurrent, and short-circuit faults during charge/discharge cycles. IC Role / Device Role / Timing Role: Analog front-end AFE providing real-time cell voltage monitoring, autonomous FET control, and host-accessible status via I²C. Use Value: Enables certified UL/IEC 62133 compliance with programmable thresholds, reduces BOM count by integrating LDO and LED/thermistor drivers. |
Use Scenario: Managing rechargeable battery packs in portable test instruments requiring stable runtime and safe deep-discharge recovery. IC Role / Device Role / Timing Role: Safety supervisor coordinating precharge, main charge, and discharge FET sequencing based on real-time cell voltage and current measurements. Use Value: Eliminates need for external voltage references or discrete comparators; 140 µA quiescent current extends shelf life of unpowered equipment. |
| Industrial Portable Tool Packs | Medical Handheld Device Batteries |
Use Scenario: Enabling ruggedized 4-cell battery packs in cordless power tools with high pulse-current tolerance and thermal monitoring. IC Role / Device Role / Timing Role: Dual-protection layer device: hardware-fast response to short circuits (<10 µs delay) plus host-configurable OC/SC thresholds for varying motor loads. Use Value: Supports >100-A peak discharge via external FETs while maintaining sub-100-µA sleep current during storage. |
Use Scenario: Safeguarding sealed Li-ion batteries in FDA-cleared handheld diagnostics where failure modes must be mitigated without host intervention. IC Role / Device Role / Timing Role: Autonomous protector triggering XALERT interrupt on brownout or OC event, allowing host MCU to log fault and initiate safe shutdown. Use Value: Meets IEC 62366 usability requirements via reliable, calibrated VCELL output and ±5% threshold accuracy - no field recalibration needed. |
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 charge pump for high-side FET drive; lacks PCHG output and TOUT thermistor drive | Preferred for designs requiring high-side N-channel FETs without external charge pump; unsuitable for precharge or thermistor-based temperature monitoring | Select BQ29330PW only if high-side gate drive is required and precharge/temperature functions are handled externally |
| MP2617GQSE-Z | Monolithic 4S protector with integrated charge/dischARGE FETs (no external FET drive); no I²C interface; fixed thresholds only | Targeted at cost-sensitive, low-complexity packs where configurability and host communication are unnecessary | Choose MP2617GQSE-Z for simplified, single-chip solutions without host MCU interaction or programmability needs |
Compared with BQ29311PWRG4, BQ29330PW trades precharge and thermistor capability for high-side FET drive, while MP2617GQSE-Z eliminates configurability and external FET flexibility to reduce component count - making BQ29311PWRG4 optimal for host-managed, multi-function battery systems.
Availability
BQ29311PWRG4 is available at Aetrix Electronics and suitable for notebook computer battery packs, portable test equipment, industrial cordless tools, and medical handheld devices requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for BQ29311PWRG4 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 ICs.
The BQ29311PWRG4 belongs to TI's bq29xxx family of battery protection AFEs, designed specifically for high-reliability, host-configurable Li-ion pack safety in portable computing and industrial applications.
FAQ
What is the primary function of the BQ29311PWRG4 in a battery management system?
The BQ29311PWRG4 serves as a 3- or 4-cell Li-ion battery pack protection analog front-end IC. It monitors individual cell voltages, detects overcurrent/short-circuit events, controls external FETs for charge/discharge/precharge, provides a 3.3-V LDO, and communicates status and configuration via I²C. Its core role is autonomous safety enforcement coordinated with host-level battery management logic - making the BQ29311PWRG4 essential for certified, adaptive battery pack designs.
Does the BQ29311PWRG4 support both charge and discharge overcurrent protection with independent thresholds?
Yes, the BQ29311PWRG4 supports fully independent overcurrent protection for charge and discharge directions. Charge overcurrent (OCCHG) is set via the OCVC register (50–205 mV range), while discharge overload (OCDSG) is set via the OCVD register (−50 to −205 mV). Each has programmable delay (1–31 ms) and 10 mV hysteresis. This dual-threshold capability allows precise tuning for asymmetric FET RDS(on) and load profiles - a key feature of the BQ29311PWRG4.
How does the BQ29311PWRG4 handle cell voltage measurement and scaling?
The BQ29311PWRG4 converts each cell's differential voltage into a GND-referenced analog output (VCELL) using the formula VCELL = −0.15 × Vcell + 0.975 V. This yields a 0–4.5 V input range mapped to 0.3–0.975 V output, compatible with standard 0–3.3 V ADCs. Cell selection is controlled by the CELL_SELECT register (b0–b1), and gain/offset calibration is supported via CAL1/CAL2 bits - ensuring accurate, host-measurable cell data in the BQ29311PWRG4.
Can the BQ29311PWRG4 operate without an external microcontroller?
The BQ29311PWRG4 provides autonomous hardware-level protection (overcurrent, short-circuit, overvoltage, undervoltage) that activates independently of a host MCU. However, full functionality - including cell balancing, threshold programming, status reading, and FET control - requires I²C communication with a host controller. While basic safety is self-contained, the BQ29311PWRG4 is designed for host-managed systems; standalone operation is limited to default protection thresholds and fixed behavior.
What is the purpose and behavior of the PCHG output on the BQ29311PWRG4?
The PCHG output on the BQ29311PWRG4 drives the gate of an external precharge FET to safely condition deeply discharged (e.g., 0-V) cells before main charging. Its voltage is clamped to 3.5 V when VPACK is 3.8–5.25 V, and scales to 2/3 × VPACK above 5.25 V. PCHG defaults to ON at startup and can be disabled via the CONTROL register (b3) or by pulling CNTL high - making it a critical element for robust zero-volt recovery in the BQ29311PWRG4.
BQ29311PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
BQ29311PWRG4 FAQ
1.How can I place an order for BQ29311PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29311PWRG4 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 BQ29311PWRG4 reliable?
The price and inventory of BQ29311PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29311PWRG4 is usually 5 days.
3.What payment methods are accepted for BQ29311PWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29311PWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ29311PWRG4?
BQ29311PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29311PWRG4 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 BQ29311PWRG4?
For technical support, including BQ29311PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29311PWRG4 requirements.
6.How does Aetrix verify that BQ29311PWRG4 is sourced from the original manufacturer or authorized distributors?
All BQ29311PWRG4 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 BQ29311PWRG4 meets industry standards.
7.What is the process for return or replacement of BQ29311PWRG4?
All BQ29311PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ29311PWRG4, 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 BQ29311PWRG4 part is unused and in its original packaging.
Return procedure for BQ29311PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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