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Texas Instruments BQ27426YZFT
- Part No.:
- BQ27426YZFT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 9-UFBGA, DSBGA
- Datasheet:
-
BQ27426YZFT.pdf
- Description:
- IC BATT MON LI-ION 1CELL 9DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,015
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Product details
Overview
BQ27426YZFT from Texas Instruments is a single-cell Li-ion system-side fuel gauge IC using Impedance Track™ algorithm, residing directly on the host PCB and supporting embedded or removable batteries. It operates from battery voltage via integrated 1.8-V LDO, consumes only 9 μA in SLEEP mode (load <10 mA), and interfaces via 400-kHz I²C. It delivers real-time remaining capacity (mAh), state-of-charge (%), and voltage (mV) for portable consumer electronics.
For engineers reviewing the BQ27426YZFT datasheet, BQ27426YZFT pinout, BQ27426YZFT application, or BQ27426YZFT equivalent, key selection criteria include ultra-low sleep current, preprogrammed 4.2/4.35/4.4-V cell profiles, Kelvin-sense current measurement with 10-mΩ resistor, integrated temperature sensing, and DSBGA-9 package compatibility with space-constrained handheld designs.
Technical Context
The BQ27426YZFT implements Texas Instruments' patented Impedance Track™ algorithm to model battery impedance versus OCV, temperature, and aging-enabling dynamic SOC estimation without host firmware calibration. Its coulomb counter uses a 16-bit integrating ADC with ±25-mV input range across SRP/SRN, supporting both high-side and low-side 10-mΩ sense configurations.
It integrates a 1.8-V LDO regulator (VBAT input 2.45–4.5 V), supports I²C at up to 400 kHz with clock stretching, and features configurable GPOUT for BAT_LOW or SOC_INT signaling. Power management includes automatic transition between NORMAL (50 μA), SLEEP (9 μA), and SHUTDOWN (0.6 μA) modes based on load current and host commands.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Input Range | 2.45 V to 4.5 V on BAT pin - powers device directly from single Li-ion cell without external supply |
| SLEEP Mode Current | 9 μA typical - extends system runtime during light-load standby (e.g., idle smartphones, wearables) |
| I²C Interface Speed | Up to 400 kHz - enables fast host polling and configuration updates without bus contention |
| Coulomb Counter Resolution | 16-bit effective - provides high-precision charge/discharge integration for accurate mAh tracking |
| Voltage Measurement Accuracy | ±0.1% typical error - ensures reliable battery voltage reporting for protection and UI feedback |
| Temperature Sensing | Integrated sensor + external thermistor support - enables thermal compensation of SOC and aging estimates |
| Chemistry Profiles | Three preprogrammed: 4.2 V, 4.35 V, 4.4 V - reduces firmware development and simplifies multi-battery SKU management |
Pinout & Package
Package: DSBGA-9 (NanoFree™ chip-scale), 1.62 mm × 1.58 mm, 0.5-mm pitch - optimized for ultra-thin, high-density mobile PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT | LDO input & battery voltage sense | Kelvin-connected to PACK+, enables direct battery monitoring and powers internal regulator |
| SRP / SRN | Differential current sense inputs | Accepts 10-mΩ sense resistor in high-side path; no calibration required; supports low-side sensing via configuration |
| VDD | 1.8-V regulated output | Powers internal circuitry; decoupled with 2.2-μF capacitor; not intended to drive external loads |
| VSS | Ground reference | Common return for analog/digital domains; must be low-impedance connection to system ground plane |
| SCL / SDA | I²C bidirectional bus lines | Open-drain, 400-kHz compatible; require external 10-kΩ pullups; support clock stretching and timeout recovery |
| GPOUT | Configurable open-drain output | Signals BAT_LOW or SOC_INT; doubles as wake-up input to exit SHUTDOWN mode when pulled high |
| BIN | Battery insertion detection | Logic-level input with internal pullup control; used for removable pack detection or left pulldown for embedded cells |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ Algorithm | Real-time modeling of battery impedance vs. OCV, temperature, aging, and rate - delivers ±5% SOC accuracy over life cycle |
| Ultra-Low Sleep Current | 9 μA at <10 mA load - minimizes parasitic drain during display-off or suspend states in portable devices |
| Preprogrammed Chemistry Support | Three factory-set profiles (4.2 V / 4.35 V / 4.4 V) - eliminates per-battery firmware tuning and accelerates design bring-up |
| Integrated LDO Regulator | 1.8-V output from battery input - removes need for external regulator and simplifies power tree |
| Configurable Interrupt Output | GPOUT supports SOC threshold alerts or battery-low warnings - reduces host CPU polling overhead and saves system power |
| Kelvin Sense Architecture | SRP/SRN differential inputs with 16-bit ADC - rejects PCB trace resistance errors and ensures precise current measurement |
Applications
| Smartphones & Tablets | Wearable Electronics |
|---|---|
|
Use Scenario: Real-time battery level display and low-power alert during active use and deep sleep. IC Role / Device Role / Timing Role: System-side fuel gauge providing mAh remaining, % SOC, and voltage via I²C; triggers GPOUT interrupt at 5% SOC. Use Value: Enables accurate battery UI and graceful OS shutdown before unexpected power loss, leveraging 9-μA SLEEP current to extend standby time. |
Use Scenario: Continuous battery monitoring in compact, always-on fitness trackers with limited PCB area. IC Role / Device Role / Timing Role: Primary fuel gauge interfacing to MCU over I²C; uses integrated temperature sensor for thermal compensation. Use Value: Delivers ±5% SOC accuracy across -20°C to 60°C ambient, enabled by Impedance Track™ and 1.62 mm × 1.58 mm DSBGA package. |
| Portable Medical Handsets | Gaming Controllers |
|
Use Scenario: Reliable runtime estimation for battery-powered diagnostic tools requiring FDA-compliant logging. IC Role / Device Role / Timing Role: Safety-critical fuel gauge supplying validated SOC and health metrics to host controller for audit trail generation. Use Value: Provides battery state-of-health (SOH) estimation and aging compensation - critical for recalibration scheduling and maintenance alerts. |
Use Scenario: High-accuracy battery reporting during burst-mode wireless transmission and vibration motor activation. IC Role / Device Role / Timing Role: Coulomb counter with 16-bit resolution tracking rapid charge/discharge transients; reports via I²C every 20 seconds in SLEEP mode. Use Value: Maintains SOC accuracy despite >1-A peak loads and thermal swings, using dynamic impedance modeling instead of fixed lookup tables. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27510-G3YZFT | Higher-accuracy 15-bit ADC, extended temperature range (–40°C to 85°C), supports 4.35-V and 4.4-V chemistries only | Targeted at premium smartphones requiring tighter SOC tolerance (<±3%) and wider thermal operation | Select when higher precision and broader temp range justify added cost and same DSBGA-9 footprint |
| BQ27220YZFT | Lower-cost variant with 14-bit coulomb counter, no integrated LDO (requires external 1.8-V rail), supports only 4.2-V profile | Suitable for cost-sensitive wearables with fixed chemistry and simpler power architecture | Choose when system already provides regulated 1.8-V supply and battery voltage is strictly 4.2 V |
Compared with BQ27426YZFT, BQ27510-G3YZFT offers improved accuracy and thermal robustness but lacks 4.2-V profile support; BQ27220YZFT reduces BOM cost but increases system power design complexity and limits chemistry flexibility.
Availability
BQ27426YZFT is available at Aetrix Electronics and suitable for smartphones, wearables, and portable medical handsets requiring stable component supply, long-term lifecycle support, and consistent Impedance Track™ fuel gauging performance.
Supply support for BQ27426YZFT 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 development.
The BQ27426YZFT belongs to TI's Impedance Track™ fuel gauge product line, designed specifically for system-side integration in space-constrained, battery-powered consumer and medical devices requiring high-accuracy, low-power runtime estimation.
FAQ
What is the primary function of the BQ27426YZFT in a battery-powered system?
The BQ27426YZFT serves as a system-side fuel gauge IC that accurately reports remaining capacity (mAh), state-of-charge (%), and battery voltage (mV) using Texas Instruments' Impedance Track™ algorithm. It resides on the host PCB-not inside the battery pack-and communicates via I²C. The BQ27426YZFT enables intelligent power management, UI battery indicators, and predictive shutdown by continuously modeling battery impedance, aging, temperature, and load dynamics without host firmware calibration.
Does the BQ27426YZFT require an external voltage regulator?
No, the BQ27426YZFT integrates a 1.8-V LDO regulator powered directly from the battery (BAT pin), eliminating the need for an external regulator. It accepts 2.45 V to 4.5 V input and delivers a stable 1.8-V supply to internal circuitry via the VDD pin, which must be decoupled with a 2.2-μF ceramic capacitor to VSS. This integrated LDO simplifies power design and reduces BOM count in portable systems using the BQ27426YZFT.
How does the BQ27426YZFT achieve accurate fuel gauging with minimal host intervention?
The BQ27426YZFT achieves high-accuracy fuel gauging through its patented Impedance Track™ algorithm, which dynamically models battery impedance versus OCV, temperature, aging, and discharge rate-all computed internally. It ships with three preprogrammed chemistry profiles (4.2 V, 4.35 V, 4.4 V), enabling plug-and-play operation. Host interaction is limited to reading registers via I²C; no runtime calibration or complex firmware is needed. The BQ27426YZFT maintains ±5% SOC accuracy across life cycle without host-driven learning.
What package type and dimensions does the BQ27426YZFT use?
The BQ27426YZFT uses a NanoFree™ DSBGA-9 (Die Size Ball Grid Array) package with a body size of 1.62 mm × 1.58 mm and 0.5-mm ball pitch. This ultra-compact chip-scale package is optimized for space-constrained applications such as smartphones, wearables, and thin medical handsets. The BQ27426YZFT's pin layout supports standard PCB assembly processes and requires no special thermal pads or underfill for reliable operation.
Can the BQ27426YZFT support both embedded and removable battery configurations?
Yes, the BQ27426YZFT explicitly supports both embedded and removable battery configurations. For removable packs, the BIN pin detects insertion via a pulldown resistor on the pack and system-side pullup; for embedded cells, BIN is configured with a 10-kΩ pulldown to VSS. The fuel gauge connects only to PACK+ (via BAT/SRP) and PACK– (via VSS/SRN), enabling identical hardware design across both use cases. This dual-mode capability makes the BQ27426YZFT ideal for platforms spanning consumer and industrial portable devices.
BQ27426YZFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Impedance Track™
- Package/Case:
- 9-UFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Fault Protection:
- -
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-DSBGA
BQ27426YZFT FAQ
1.How can I place an order for BQ27426YZFT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27426YZFT 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 BQ27426YZFT reliable?
The price and inventory of BQ27426YZFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27426YZFT is usually 5 days.
3.What payment methods are accepted for BQ27426YZFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27426YZFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27426YZFT?
BQ27426YZFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27426YZFT 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 BQ27426YZFT?
For technical support, including BQ27426YZFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27426YZFT requirements.
6.How does Aetrix verify that BQ27426YZFT is sourced from the original manufacturer or authorized distributors?
All BQ27426YZFT 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 BQ27426YZFT meets industry standards.
7.What is the process for return or replacement of BQ27426YZFT?
All BQ27426YZFT units undergo pre-shipment inspection (PSI). If there is an issue with BQ27426YZFT, 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 BQ27426YZFT part is unused and in its original packaging.
Return procedure for BQ27426YZFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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