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Texas Instruments BQ28300PWR
- Part No.:
- BQ28300PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- -
- Datasheet:
-
BQ28300PWR.pdf
- Description:
- POWER SUPPLY MANAGEMENT CIRCUIT,
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
BQ28300PWR from Texas Instruments is a fully integrated gas gauge and battery protection IC for 2- or 3-series Li-ion/Li-polymer packs, featuring 16-bit integrating ADC for coulomb counting (±10 µV offset), dual 15/16-bit delta-sigma ADCs for cell voltage/temperature sensing, and P-channel high-side FET drive with <80 µA sleep current. It enables SBS-compliant smart battery systems in notebook PCs and portable medical instrumentation.
For engineers reviewing the BQ28300PWR datasheet, BQ28300PWR pinout, BQ28300PWR application, or BQ28300PWR equivalent, this page delivers verified technical context on CEDV gauging accuracy, SMBus v1.1 interface timing, cell imbalance detection, pre-charge FET control, and thermal shutdown thresholds - all confirmed for the exact TSSOP-20 (PW) package variant.
Technical Context
The BQ28300PWR implements a fixed-function analog front-end with two independent ADC subsystems: a 22-bit effective-resolution integrating delta-sigma ADC for bidirectional current sensing across SRP/SRN (–0.20 V to +0.25 V range), and a 16-bit delta-sigma ADC with 16-channel multiplexer for simultaneous VC1–VC3, TS1, BAT, PACK, and REG27 monitoring. Its embedded CPU executes pre-programmed CEDV gas gauging with self-discharge compensation and stores user settings in single-write non-volatile memory.
Protection logic operates autonomously via hardware comparators for OV/UV/OT/SC/CIM, with configurable thresholds (e.g., OCD at 50–200 mV, SCCT at –100 to –300 mV) and programmable delay steps (OCDD step = 2 ms, SCDD step = 122 µs). All FET drives (CHG, DSG, ZVCHG, FUSE) are P-channel high-side outputs with 9–13.5 V turn-on voltage and 40–200 µs rise/fall times into 4700 pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | PACK/BAT: 3.8 V to 18.75 V - supports full 2S/3S Li-ion stack operation including startup at 5.2 V |
| Coulomb Counter Accuracy | ±10 µV offset error, ±0.034%FSR INL - enables sub-1% capacity estimation drift over temperature |
| Cell Voltage Accuracy | ±20 mV (–20°C to 85°C) - ensures reliable overvoltage/undervoltage protection triggering at ±25 mV margins |
| Sleep Current | <80 µA - extends battery pack shelf life without compromising wake-on-current detection |
| SMBus Interface | v1.1 slave mode, 10–100 kHz clock - interoperates with standard SBS host controllers without protocol translation |
| Operating Temperature | –20°C to +85°C - validated for industrial-grade portable equipment environments |
| Package | 20-pin TSSOP (PW), RoHS compliant - enables compact, low-profile battery pack PCB layout with 0.65 mm pitch |
Pinout & Package
20-pin TSSOP (PW) package, 0.65 mm pitch, RoHS compliant, thermal pad not exposed. Dimensions: 6.5 mm × 4.4 mm × 1.2 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT | Primary supply input | Connects to most positive cell terminal; powers internal LDO and analog circuitry |
| DSG | Discharge FET gate driver | P-channel high-side output; drives external discharge MOSFET with 9–13.5 V swing |
| VC1–VC3 | Cell voltage sense inputs | Differential inputs for 1st/2nd/3rd most positive cells; support external balancing via weak internal pull-downs |
| SRP/SRN | Coulomb counter differential inputs | Accept –0.20 V to +0.25 V across sense resistor; enable bidirectional current integration |
| TS1 | Thermistor input | Analog input for Semitec 103AT or equivalent NTC; used for charge/discharge thermal regulation |
| SMBD/SMBC | SMBus data/clock | Open-drain I/O with internal 600–1300 kΩ pull-down; compliant with SBS v1.1 timing requirements |
| CHG/ZVCHG | Charge/pre-charge FET drivers | Independent P-channel outputs; ZVCHG enables 0-V charging of deeply discharged cells |
| FUSE | Fuse circuit drive | Push-pull output for blowing external fuse during permanent fault conditions (e.g., safety OT) |
| RBI | RAM backup supply | Accepts capacitor-backed voltage to retain SRAM data during momentary power loss |
| REG27 | 2.7 V regulator output | Supplies internal circuitry; requires 1 µF decoupling capacitor to VSS |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CEDV gas gauging | Compensates for temperature, SOC, and self-discharge to deliver remaining capacity accuracy within ±1% under dynamic load |
| Dual independent ADC architecture | Separate 22-bit integrating ADC for current + 16-bit multiplexed ADC for voltage/temperature avoids measurement crosstalk |
| Hardware-based protection engine | Dedicated comparators for OV/UV/OT/SC/CIM with sub-millisecond response - no CPU dependency for critical faults |
| Single-write non-volatile configuration | User settings (protection thresholds, gauging parameters) stored permanently after Commit; immune to accidental reprogramming |
| Pre-charge and zero-volt charge support | ZVCHG output enables safe recovery of cells down to 0 V using external pre-charge FET and current limiting |
| Internal clock synthesizer | No external crystal or RC network required - reduces BOM count and layout complexity in space-constrained packs |
Applications
| Notebook Battery Pack | Portable Medical Device |
|---|---|
Use Scenario: Smart battery module for ultrabook with runtime prediction, health reporting, and OEM authentication. IC Role / Device Role / Timing Role: Primary gas gauge and protection controller; performs 1-second interval measurements and SMBus status updates. Use Value: Enables Windows ACPI battery class compliance and accurate time-to-empty estimation under variable CPU/GPU loads. |
Use Scenario: Rechargeable battery pack for handheld ECG monitor requiring FDA-grade safety and calibration traceability. IC Role / Device Role / Timing Role: Safety-critical protection manager with independent hardware fault detection and fuse blow capability. Use Value: Meets IEC 62366 usability requirements via deterministic overtemperature shutdown (125°C trigger) and cell imbalance alerts. |
| Industrial Test Equipment | Portable Instrumentation |
Use Scenario: Field-deployable multimeter with hot-swappable Li-ion battery and firmware-updatable gauging parameters. IC Role / Device Role / Timing Role: Embedded battery manager interfacing with MCU via SMBus; retains RAM state during brief power interruptions. Use Value: RBI pin backup preserves coulomb counter state across 100-ms brownouts, preventing capacity drift during intermittent operation. |
Use Scenario: Handheld spectrum analyzer operating in remote locations with extended shelf life requirements. IC Role / Device Role / Timing Role: Low-power gas gauge executing sleep mode (69 µA) with wake-on-current detection for periodic diagnostics. Use Value: Achieves >12-month shelf life by minimizing quiescent current while maintaining fast (<1 ms) wake response for usage logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ28Z610RSMR | Supports 1–4 series cells; includes SHA-256 authentication; higher accuracy (±1% SoC); 32-bit MCU core | Required for secure battery authentication in OEM notebooks; supports larger cell counts and advanced diagnostics | Select when cryptographic security, wider cell count range, or field-upgradable firmware is mandatory |
| BQ29400PW | Dedicated analog protector only (no gas gauge); 3.3 V LDO; simpler register map; no SMBus interface | Used in cost-sensitive 2S/3S packs where host MCU handles gauging; lacks CEDV algorithm and RAM backup | Select when only hardware-level protection is needed and system-level gauging is handled externally |
Compared with BQ28300PWR, BQ28Z610RSMR adds security and scalability but increases BOM cost and design complexity, while BQ29400PW reduces functionality to basic protection only - making BQ28300PWR the optimal balance of integrated gauging, autonomous protection, and SMBus compatibility for mid-tier portable applications.
Availability
BQ28300PWR is available at Aetrix Electronics and suitable for notebook PC battery packs, portable medical devices, industrial test equipment, and handheld instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for BQ28300PWR 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 systems.
The BQ28300PWR belongs to TI's Smart Battery Manager product line, designed specifically for cost-optimized, SBS-compliant 2S/3S Li-ion packs requiring integrated gauging, hardware protection, and minimal external components.
FAQ
What is the primary function of the BQ28300PWR in a battery pack?
The BQ28300PWR serves as a fully integrated gas gauge and analog monitoring management IC for 2- or 3-series Li-ion battery packs. It performs real-time coulomb counting via its integrating ADC, executes CEDV-based state-of-charge estimation, and provides autonomous hardware protection against overvoltage, undervoltage, overtemperature, short circuit, and cell imbalance - all within a single 20-pin TSSOP package. The BQ28300PWR communicates results and accepts commands via SMBus v1.1.
Does the BQ28300PWR support zero-volt charging, and how is it implemented?
Yes, the BQ28300PWR supports zero-volt charging through its dedicated ZVCHG pin (Pin 18), which drives an external P-channel pre-charge FET. When a deeply discharged cell is detected, the BQ28300PWR activates ZVCHG to enable controlled current flow before main charging begins. This prevents lithium plating and ensures safe recovery of cells down to 0 V. The BQ28300PWR also monitors pre-charge current and terminates if thresholds are exceeded.
How does the BQ28300PWR maintain data integrity during brief power interruptions?
The BQ28300PWR uses its RBI (RAM Backup Input) pin (Pin 14) to preserve SRAM contents during transient power loss. By connecting a capacitor between RBI and VSS, the device maintains sufficient voltage to retain gas gauging registers, cycle count, and runtime data for up to several milliseconds. This ensures no capacity drift occurs during momentary brownouts - a critical feature for portable instrumentation relying on accurate cumulative charge tracking.
What are the key differences between the BQ28300PWR and the BQ29400PW?
The BQ28300PWR integrates both gas gauging and protection functions, includes SMBus v1.1 communication, and features CEDV algorithm execution, while the BQ29400PW is a standalone analog protector with no gauging capability or digital interface. The BQ28300PWR uses a 2.7 V internal LDO and supports 3.8–18.75 V operation, whereas the BQ29400PW relies on a 3.3 V supply and offers simpler threshold programming. For systems needing host-independent protection only, BQ29400PW suffices; for SBS-compliant smart batteries, BQ28300PWR is required.
Can the BQ28300PWR be used in a 2-cell configuration, and how is it configured?
Yes, the BQ28300PWR natively supports 2-cell configurations. In this mode, VC1 (Pin 3) is externally shorted to VC2 (Pin 4), and VC3 (Pin 5) is left unconnected or tied to VSS. The device automatically detects the configuration during initialization and adjusts its cell voltage monitoring and protection logic accordingly. No firmware change or register write is needed - the hardware topology alone determines operation mode.
BQ28300PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Battery Chemistry:
- -
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
BQ28300PWR FAQ
1.How can I place an order for BQ28300PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ28300PWR 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 BQ28300PWR reliable?
The price and inventory of BQ28300PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ28300PWR is usually 5 days.
3.What payment methods are accepted for BQ28300PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ28300PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ28300PWR?
BQ28300PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ28300PWR 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 BQ28300PWR?
For technical support, including BQ28300PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ28300PWR requirements.
6.How does Aetrix verify that BQ28300PWR is sourced from the original manufacturer or authorized distributors?
All BQ28300PWR 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 BQ28300PWR meets industry standards.
7.What is the process for return or replacement of BQ28300PWR?
All BQ28300PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ28300PWR, 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 BQ28300PWR part is unused and in its original packaging.
Return procedure for BQ28300PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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