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Texas Instruments BQ27350PWR
- Part No.:
- BQ27350PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ27350PWR.pdf
- Description:
- IC BATT FUEL MGR LI-ION 20-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,573
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Product details
Overview
BQ27350PWR from Texas Instruments is a single-cell Li-Ion/Li-Polymer battery fuel gauge IC with integrated Impedance Track™ algorithm, SHA-1/HMAC secure authentication, and I²C interface. It delivers ±1% state-of-charge accuracy, measures voltage (0–6000 mV), temperature (0–6553.5 °K in 0.1°K steps), and current via 16-bit coulomb counter, and supports time-to-empty prediction - deployed in smartphones, digital cameras, and handheld terminals.
For engineers reviewing the BQ27350PWR datasheet, BQ27350PWR pinout, BQ27350PWR application, or BQ27350PWR equivalent, this page provides verified technical context, validated pin functions, real-world application cards, confirmed alternative parts with documented functional differences, and supply-chain support details for production design-in.
Technical Context
The BQ27350PWR implements Texas Instruments' patented Impedance Track™ algorithm to model battery discharge curves, dynamically adjusting for aging, self-discharge, and temperature/rate inefficiencies. It uses dual oscillators - 32.768 kHz low-frequency and 4.194 MHz high-frequency - for precise timing in coulomb counting and flash operations.
It integrates a 16-bit integrating ADC for current sensing across a ≤20 mΩ sense resistor (±0.20 V input range, 10 µV offset post-calibration), plus 14–15-bit ADCs for cell voltage and temperature measurement. Authentication is supported either internally or via external bq26100 through dedicated AUTH/PAUTH pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.4–2.6 V - powers internal circuitry without external LDO; compatible with single-cell Li-ion nominal voltage range. |
| Fuel Gauge Accuracy | ±1% SOC - achieved via Impedance Track™ modeling of OCV vs. load behavior, enabling reliable runtime estimation. |
| Coulomb Counter Resolution | 16-bit - supports high-precision charge/discharge integration with ≤10 µV input offset after auto-calibration. |
| I²C Interface Speed | 100 kHz standard-mode - enables host MCU communication without high-speed timing constraints or level-shifting. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and portable consumer environments including smartphones and POS terminals. |
| Power Modes | NORMAL (150 µA), SLEEP (7.4 µA), HIBERNATE (1.5 µA) - minimizes quiescent current during idle states without sacrificing wake-up responsiveness. |
| Data Flash | 96 bytes user-programmable - partitioned into three 32-byte Manufacturer Info blocks for calibration data, chem ID, and pack-specific parameters. |
Pinout & Package
Package: 20-pin TSSOP (PW), 0.65 mm pitch, body size 6.5 mm × 4.4 mm, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SE (Pin 1) | Open-drain system enable output | Drives external LDO enable line low to power auxiliary circuitry only when gauge is active - reduces system standby leakage. |
| TS (Pin 3) | Analog thermistor input | Accepts NTC thermistor (e.g., Semitec 103AT) for accurate pack temperature monitoring - critical for Impedance Track™ compensation and safety flag generation. |
| SDATA (Pin 8) | I²C bidirectional data line | Open-drain interface requiring external pull-up; communicates all battery parameters (SOC, TTE, voltage, flags) to host processor. |
| SCLK (Pin 10) | I²C clock input | Controls synchronous data transfer timing; supports standard-mode 100 kHz operation with defined rise/fall and pulse-width specs. |
| SRP / SRN (Pins 14/15) | Coulomb counter differential inputs | Measure voltage drop across sense resistor (≤20 mΩ); SRP connects to CELL– side, SRN to PACK– side - enables high-side or low-side current sensing topology. |
| CELL+ / CELL– (Pins 19/20) | Differential cell voltage inputs | Directly monitor single-cell terminal voltage (0–6000 mV range) with 14–15-bit resolution - essential for OCV-based capacity modeling. |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ fuel gauging | Delivers ±1% SOC accuracy by modeling battery impedance changes over aging, temperature, and load - eliminates need for periodic full-charge recalibration. |
| SHA-1/HMAC authentication | Enables secure battery pack identification using on-chip crypto engine or external bq26100 - prevents counterfeit battery insertion in branded devices. |
| 96-byte programmable data flash | Stores manufacturer-specific calibration data, chemical ID, and pack configuration - persists across power cycles and supports field updates during manufacturing. |
| Multi-mode power management | Automatically transitions between NORMAL, SLEEP, and HIBERNATE modes based on activity; achieves 1.5 µA hibernate current for long-term storage. |
| Integrated protection flag reporting | Generates real-time flags (OTC, OTD, CHG_INH, TDA) via Flags( ) command - allows host MCU to enforce thermal and charge/discharge safety limits without external comparators. |
Applications
| Smartphones | Digital Cameras |
|---|---|
Use Scenario: Real-time battery remaining capacity and time-to-empty estimation during video recording and display backlight operation. IC Role / Device Role / Timing Role: Primary fuel gauge and safety monitor - reports SOC, TTE, voltage, temperature, and over-temp flags to application processor via I²C every second. Use Value: Enables accurate battery percentage display and graceful shutdown before unexpected power loss, improving user experience and device reliability. |
Use Scenario: Predicting remaining shot count and playback time under variable flash, zoom, and LCD usage loads. IC Role / Device Role / Timing Role: High-accuracy coulomb counter and OCV-based capacity estimator - compensates for rapid load transients and temperature drift during burst shooting. Use Value: Delivers consistent runtime prediction across diverse operating conditions, reducing premature "low battery" warnings during critical capture moments. |
| Handheld Terminals | POS Terminals |
Use Scenario: Maintaining precise runtime awareness during extended barcode scanning sessions with intermittent wireless transmission. IC Role / Device Role / Timing Role: Low-power fuel gauge in SLEEP/HIBERNATE modes - wakes on I²C request or current threshold crossing to report updated SOC and TTE. Use Value: Extends operational uptime between charges by minimizing gauge quiescent current while preserving measurement fidelity. |
Use Scenario: Supporting hot-swap battery replacement and secure pack authentication in retail payment systems. IC Role / Device Role / Timing Role: Secure authentication enabler and capacity validator - verifies SHA-1/HMAC challenge-response with host controller before enabling charging or data access. Use Value: Prevents use of non-OEM batteries that may lack safety circuitry or calibrated capacity data, ensuring compliance with UL/IEC 62368-1 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27426YZFT | Higher integration: includes integrated sense resistor path and enhanced Impedance Track™ v2; 12-bit ADC only; no external thermistor support (internal sensor only). | Targeted at space-constrained designs where PCB area is premium; lacks TS pin flexibility for external NTC placement. | Select BQ27426YZFT when board layout favors monolithic integration and thermal monitoring via internal sensor suffices. |
| BQ27510-G3YZFT | Supports 2-cell configurations; adds gas gauge + protector combo functionality; requires external protection FET control logic; larger 128-byte data flash. | Used in higher-voltage portable tools and medical devices needing multi-cell tracking and embedded protection coordination. | Choose BQ27510-G3YZFT only if migrating from single- to dual-cell architecture or requiring integrated protection signaling. |
Compared with BQ27350PWR, BQ27426YZFT trades external thermistor flexibility and pin count for smaller footprint and simplified layout, while BQ27510-G3YZFT extends functionality to multi-cell systems at the cost of increased complexity and non-drop-in compatibility.
Availability
BQ27350PWR is available at Aetrix Electronics and suitable for smartphones, digital cameras, and handheld terminals requiring stable component supply, long-lifecycle support, and traceable sourcing for production ramp.
Supply support for BQ27350PWR 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 expertise in battery management systems.
The BQ27350PWR belongs to TI's Impedance Track™ fuel gauge product line, designed specifically for high-accuracy, low-power single-cell Li-ion/Li-polymer battery monitoring in portable consumer and industrial equipment.
FAQ
What is the primary function of the BQ27350PWR in a battery pack?
The BQ27350PWR serves as a standalone fuel gauge IC that accurately measures and reports remaining capacity, state-of-charge, time-to-empty, voltage, temperature, and current for single-cell Li-ion/Li-polymer batteries. It performs these functions using its proprietary Impedance Track™ algorithm and communicates results to the host system via I²C. The BQ27350PWR does not control charging or protection FETs directly but provides the data needed for host-based decisions.
Does the BQ27350PWR support external thermistor connections?
Yes, the BQ27350PWR supports external NTC thermistors via the TS (Pin 3) and TOUT (Pin 7) terminals. It is configured by default for Semitec 103AT, and the temperature source is selected via the [TEMPS] bit in the Pack Configuration register. This capability enables precise thermal profiling critical for Impedance Track™ modeling and safety flag generation in the BQ27350PWR.
How does the BQ27350PWR achieve ±1% state-of-charge accuracy?
The BQ27350PWR achieves ±1% state-of-charge accuracy through Texas Instruments' patented Impedance Track™ algorithm, which continuously models battery impedance using real-time voltage, current, temperature, and historical usage data. It compensates for aging, self-discharge, and temperature/rate inefficiencies - all validated across –40°C to +85°C. This algorithm, combined with a 16-bit coulomb counter and 14–15-bit ADCs, ensures the BQ27350PWR maintains high fidelity without requiring full-charge recalibration.
Can the BQ27350PWR operate without an external microcontroller?
No, the BQ27350PWR requires a host microcontroller to initiate I²C commands (e.g., RemainingCapacity( ), Temperature( ), Flags( )) and interpret responses. It does not run autonomous firmware or generate interrupts. However, it minimizes host dependency by performing all fuel gauging computations internally - the host only reads precomputed values. The BQ27350PWR remains fully functional as long as the host issues periodic queries and supplies 2.4–2.6 V power.
What authentication methods does the BQ27350PWR support?
The BQ27350PWR supports SHA-1/HMAC authentication either internally using its on-chip crypto engine or externally via the AUTH and PAUTH pins connected to a bq26100 authentication IC. The choice is configurable during manufacturing. This dual-path architecture allows OEMs to implement secure battery identification and prevent counterfeits - a core security feature built into the BQ27350PWR's design.
BQ27350PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Impedance Track™
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Battery Authentication
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Fault Protection:
- -
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
BQ27350PWR FAQ
1.How can I place an order for BQ27350PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27350PWR 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 BQ27350PWR reliable?
The price and inventory of BQ27350PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27350PWR is usually 5 days.
3.What payment methods are accepted for BQ27350PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27350PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27350PWR?
BQ27350PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27350PWR 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 BQ27350PWR?
For technical support, including BQ27350PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27350PWR requirements.
6.How does Aetrix verify that BQ27350PWR is sourced from the original manufacturer or authorized distributors?
All BQ27350PWR 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 BQ27350PWR meets industry standards.
7.What is the process for return or replacement of BQ27350PWR?
All BQ27350PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ27350PWR, 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 BQ27350PWR part is unused and in its original packaging.
Return procedure for BQ27350PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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