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Texas Instruments BQ27520YZFT-G4
- Part No.:
- BQ27520YZFT-G4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 15-UFBGA, DSBGA
- Datasheet:
-
BQ27520YZFT-G4.pdf
- Description:
- IC BATT FUEL GAUGE LIION 15DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,069
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Product details
Overview
BQ27520YZFT-G4 from Texas Instruments is a system-side single-cell Li-ion battery fuel gauge IC with integrated 2.5-V LDO regulator, Impedance Track™ algorithm, and I²C interface. It delivers ±1% state-of-charge accuracy across temperature, aging, and load conditions while supporting up to 14,500 mAh capacity and dual battery profile switching for removable packs.
For engineers reviewing the BQ27520YZFT-G4 datasheet, BQ27520YZFT-G4 pinout, BQ27520YZFT-G4 application, or BQ27520YZFT-G4 equivalent, key selection considerations include coulomb counter offset (≤10 µV), LDO output regulation (2.3–2.6 V @ ≤16 mA), 14-bit ADC resolution for voltage/temperature/sense, 400-kHz I²C timing compliance, and DSBGA-15 package thermal resistance (RθJA = 70°C/W).
Technical Context
The BQ27520YZFT-G4 implements a patented Impedance Track™ algorithm that dynamically models battery impedance using real-time OCV, current integration, and temperature inputs to compute FullChargeCapacity() and StateOfCharge(). It uses two independent oscillators - an 8.389-MHz high-frequency oscillator and a 32.768-kHz low-frequency oscillator - to support precise coulomb counting and periodic wake-up in SLEEP mode.
Its analog front end includes Kelvin-connected SRP/SRN pins for sense-resistor measurement (±0.125 V range, 10 µV offset), BAT pin for cell voltage sensing (0–5 V range), and TS pin for thermistor-based temperature acquisition (with 14-bit resolution and ±2 mV/°C internal sensor gain). The device supports three external digital outputs - SOC_INT, BAT_LOW, and BAT_GD - each configurable via operational configuration registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Input Range | VREGIN = 2.45–4.5 V; powers internal LDO and enables operation down to 2.45 V during low-battery conditions |
| LDO Output | 2.5 V ±0.2 V at ≤16 mA; powers internal circuitry only - not intended for external loads |
| Coulomb Counter Accuracy | Input offset ≤10 µV; supports 5–20 mΩ sense resistors with 14-bit resolution and 1-s conversion time |
| I²C Interface | 400-kHz standard-mode compliant; open-drain SDA/SCL with 10-kΩ pullups; supports byte-write commands above 100 kHz |
| ADC Resolution | 14–15 bits for BAT, TS, and SRP/SRN inputs; 125-ms conversion time for temperature/cell voltage |
| Operating Temperature | –40°C to +85°C ambient; junction-to-ambient thermal resistance of 70°C/W in YZF DSBGA package |
| Data Retention | 10 years in data flash memory; 20,000 write cycles; 2-ms word programming time |
Pinout & Package
Tiny 15-ball NanoFree™ DSBGA (YZF) package, 2.610 mm × 1.956 mm body size, 0.5-mm pitch, bottom-side solder balls only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (E2) | Cell voltage input | Analog ADC input for battery voltage sensing; max 4.8 V for full accuracy; high-impedance (8 MΩ) when idle |
| SRP (A1) / SRN (B1) | Coulomb counter differential inputs | Kelvin-connected sense inputs for 5–20 mΩ resistor; ±0.125 V range; 2.5-MΩ effective input resistance |
| TS (D3) | Thermistor voltage sense | ADC input for NTC thermistor network (e.g., 10.0 kΩ @ 25°C); supports external or internal temperature reporting |
| SCL (A3) / SDA (B3) | I²C serial interface | Open-drain bidirectional lines; require 10-kΩ pullup to VCC; support 400-kHz clock with defined rise/fall timing |
| SOC_INT (A2) | State-of-charge interrupt | Open-drain output signaling SOC threshold crossing; toggles on [SOC1] flag change; configurable polarity and enable |
| BAT_LOW (C3) | Battery low warning | Push-pull output active-high by default; indicates RemainingCapacity() below SOC1 threshold; polarity configurable |
| REGIN (E1) | LDO input supply | Accepts 2.45–4.5 V; decoupled with 0.1-µF ceramic capacitor; powers internal 2.5-V LDO |
| VCC (D1) | LDO output / core power | 2.5-V regulated supply for internal logic; decoupled with 1-µF ceramic capacitor to VSS |
| VSS (C1, C2) | Ground reference | Primary ground connection for analog and digital domains; shared return for LDO, ADC, and I²C |
| BI/TOUT (E3) | Battery insertion detection | Power pin for thermistor network; also serves as thermistor multiplexer control; requires >1-MΩ pullup |
| CE (D2) | Chip enable | Active-high input disabling internal LDO when low; ESD diode tied to REGIN - VCE must not exceed VREGIN |
| BAT_GD (B2) | Battery good indicator | Push-pull output active-low by default; signals valid battery presence; enabled via OpConfig C [BATGSPUEN] |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ Algorithm | Real-time battery impedance modeling enabling ±1% SOC accuracy across aging, temperature, and discharge rate variations |
| Dual Battery Profile Support | Independent storage and automatic switching between two battery profiles - essential for systems with swappable packs |
| Integrated 2.5-V LDO | On-chip regulator eliminates need for external bias supply; delivers stable core power with 2.3–2.6 V output tolerance |
| Configurable Digital Outputs | SOC_INT, BAT_LOW, and BAT_GD pins support programmable polarity, enable/disable, and interrupt behavior via OpConfig registers |
| Low-Power Operating Modes | Five modes (NORMAL, SNOOZE, SLEEP, HIBERNATE, BAT INSERT CHECK) reduce quiescent current from 118 µA to 8 µA |
| Flash-Based Configuration Storage | 32-byte scratch-pad FLASH NVM stores calibration data, design parameters, and operational settings with 10-year retention |
Applications
| Smartphones | Tablets |
|---|---|
Use Scenario: Real-time battery remaining capacity and time-to-empty estimation during multi-tasking and video playback. IC Role / Device Role / Timing Role: System-side fuel gauge providing host processor with updated SOC, voltage, temperature, and health metrics every 1–5 seconds via I²C. Use Value: Enables accurate low-battery warnings and graceful OS shutdown before unexpected power loss - critical for user experience and data integrity. |
Use Scenario: Managing battery state during simultaneous Wi-Fi, Bluetooth, and display activity with variable thermal loading. IC Role / Device Role / Timing Role: Primary fuel gauging element using Impedance Track™ to compensate for self-discharge and temperature drift across wide operating ranges. Use Value: Maintains <1% SOC error over full lifecycle despite repeated charge/discharge cycles and ambient temperature swings from 0°C to 45°C. |
| Digital Cameras | Handheld Terminals |
Use Scenario: Predicting remaining shot count and video recording time under burst-mode flash and image processing loads. IC Role / Device Role / Timing Role: High-accuracy coulomb counter with 10-µV offset and 14-bit ADC delivering precise mAh consumption tracking per capture cycle. Use Value: Eliminates premature "battery empty" alerts during high-current flash operation by distinguishing true depletion from voltage sag. |
Use Scenario: Supporting hot-swappable battery operation in logistics scanners and field service devices with frequent pack changes. IC Role / Device Role / Timing Role: Dual-profile fuel gauge automatically selecting correct characterization data upon pack insertion detected via BI/TOUT pin. Use Value: Ensures consistent SOC reporting across multiple battery units without manual reconfiguration or host firmware intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27520YZFR-G4 | Same die, identical specifications, but shipped in tape-and-reel packaging with 3000-unit quantity vs. 250-unit for YZFT-G4 | No functional difference; selected when higher-volume automated assembly is required | Choose YZFR-G4 for SMT production runs; YZFT-G4 suits prototyping, evaluation, or low-volume builds |
| BQ27510-G3 | Legacy generation with lower accuracy (±5% SOC), no integrated LDO, and no dual-profile support; uses same DSBGA-15 package | Lacks Impedance Track™ refinement and aging compensation - unsuitable for long-life or high-accuracy applications | Select BQ27520YZFT-G4 where battery health monitoring, removable-pack flexibility, or sub-1% SOC error is mandatory |
Compared with BQ27520YZFT-G4, the YZFR-G4 offers identical electrical performance in higher-volume packaging, while the BQ27510-G3 lacks integrated regulation, dual-profile capability, and advanced aging compensation - making it inadequate for modern portable electronics requiring precision fuel gauging over extended service life.
Availability
BQ27520YZFT-G4 is available at Aetrix Electronics and suitable for smartphones, tablets, and handheld terminals requiring stable component supply, long-term lifecycle support, and guaranteed traceability for industrial and consumer OEM programs.
Supply support for BQ27520YZFT-G4 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 BQ27520YZFT-G4 belongs to TI's Impedance Track™ fuel gauge product line, engineered specifically for space-constrained portable devices needing high-accuracy, system-side battery monitoring without external microcontroller overhead.
FAQ
What is the primary function of the BQ27520YZFT-G4 in a portable electronics design?
The BQ27520YZFT-G4 serves as a system-side fuel gauge IC that accurately reports remaining battery capacity, state-of-charge (SOC), time-to-empty, and battery health using Texas Instruments' Impedance Track™ algorithm. It resides on the main PCB rather than inside the battery pack, eliminating the need for embedded fuel gauge circuitry in removable batteries. Its integrated 2.5-V LDO, I²C interface, and low-power modes make it ideal for smartphones, tablets, and handheld terminals where board space and power efficiency are critical.
Does the BQ27520YZFT-G4 require an external sense resistor, and what value range is supported?
Yes, the BQ27520YZFT-G4 requires an external low-value sense resistor connected between SRP and SRN pins for current measurement. It supports resistor values from 5 mΩ to 20 mΩ, with typical implementation using a 10-mΩ unit. This Kelvin-connected configuration minimizes PCB layout errors and enables high-precision coulomb counting with ≤10 µV input offset - essential for maintaining <1% SOC accuracy across operating conditions.
How does the BQ27520YZFT-G4 handle battery pack swapping in devices with removable batteries?
The BQ27520YZFT-G4 supports two independent battery profiles stored in its data flash memory. Upon detecting pack insertion via the BI/TOUT pin, it automatically selects the appropriate profile based on learned impedance characteristics. This allows seamless operation across different battery units without host intervention. Each profile retains unique Qmax, OCV tables, and aging parameters - ensuring accurate SOC reporting regardless of which pack is installed.
What are the power supply requirements for the BQ27520YZFT-G4, and how is its internal LDO used?
The BQ27520YZFT-G4 accepts a 2.45–4.5 V input on the REGIN pin to power its integrated 2.5-V LDO, which supplies regulated VCC for internal circuitry. A 0.1-µF ceramic capacitor is required between REGIN and VSS, and a 1-µF capacitor between VCC and VSS. The LDO is not intended to power external components - it solely powers the BQ27520YZFT-G4's core logic, ADC, and coulomb counter, delivering 2.3–2.6 V at up to 16 mA with tight regulation critical for measurement stability.
Can the BQ27520YZFT-G4 operate without an external thermistor, and what alternatives are available?
Yes, the BQ27520YZFT-G4 can operate without an external thermistor by using its internal temperature sensor (–2 mV/°C gain) or accepting temperature data from the host processor via I²C. When using the internal sensor, no external components are needed beyond standard decoupling capacitors. For highest accuracy, TI recommends a 10.0 kΩ ±1% NTC thermistor (e.g., Semitec 103AT) with 18.2-kΩ pullup between BI/TOUT and TS pins - enabling precise thermal compensation for Impedance Track™ modeling.
BQ27520YZFT-G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Impedance Track™
- Package/Case:
- 15-UFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 15-DSBGA
BQ27520YZFT-G4 FAQ
1.How can I place an order for BQ27520YZFT-G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27520YZFT-G4 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 BQ27520YZFT-G4 reliable?
The price and inventory of BQ27520YZFT-G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27520YZFT-G4 is usually 5 days.
3.What payment methods are accepted for BQ27520YZFT-G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27520YZFT-G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27520YZFT-G4?
BQ27520YZFT-G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27520YZFT-G4 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 BQ27520YZFT-G4?
For technical support, including BQ27520YZFT-G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27520YZFT-G4 requirements.
6.How does Aetrix verify that BQ27520YZFT-G4 is sourced from the original manufacturer or authorized distributors?
All BQ27520YZFT-G4 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 BQ27520YZFT-G4 meets industry standards.
7.What is the process for return or replacement of BQ27520YZFT-G4?
All BQ27520YZFT-G4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ27520YZFT-G4, 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 BQ27520YZFT-G4 part is unused and in its original packaging.
Return procedure for BQ27520YZFT-G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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