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Texas Instruments BQ27520YZFR-G4
- Part No.:
- BQ27520YZFR-G4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 15-UFBGA, DSBGA
- Datasheet:
-
BQ27520YZFR-G4.pdf
- Description:
- IC BATT FUEL GAUGE LIION 15DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,010
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Product details
Overview
BQ27520YZFR-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 (SOC) error across operating conditions, supports up to 14500-mAh capacity, and operates from –40°C to +85°C. It resides on the host mainboard for embedded or removable battery packs in space-constrained portable electronics.
For engineers reviewing the BQ27520YZFR-G4 datasheet, BQ27520YZFR-G4 pinout, BQ27520YZFR-G4 application, or BQ27520YZFR-G4 equivalent, key selection criteria include coulomb counter offset (<10 µV), 14-bit ADC resolution for voltage/temperature/sense, 400-kHz I²C timing compliance, dual battery profile support, and NanoFree™ DSBGA-15 package footprint compatibility.
Technical Context
The BQ27520YZFR-G4 implements Texas Instruments' patented Impedance Track™ algorithm using real-time cell impedance profiling derived from open-circuit voltage (OCV), load voltage, and integrated current. It performs periodic coulomb counting via a 14–15-bit integrating ADC with ±0.034% FSR INL and 1-s conversion time on the SRP/SRN differential sense inputs.
It integrates a 2.5-V LDO (2.3–2.6 V output, 16-mA max load) powered from REGIN, dual oscillators (8.389 MHz HFO, 32.768 kHz LFO), and 32-byte scratch-pad flash NVM. Power management includes five modes-NORMAL, SNOOZE, SLEEP, HIBERNATE, and BAT INSERT CHECK-with supply currents ranging from 8 µA (HIBERNATE) to 118 µA (NORMAL).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.45 V to 4.5 V on REGIN; enables operation across Li-ion discharge curve without external biasing |
| Integrated LDO Output | 2.5 V ±0.2 V (2.3–2.6 V), powers internal circuitry only - no external load capability |
| Coulomb Counter Accuracy | ±10 µV input offset, 14–15-bit resolution, 1-s conversion time - ensures sub-1% SOC drift over charge/discharge cycles |
| I²C Interface Speed | 400 kHz standard-mode - supports high-throughput register reads/writes without bus contention in real-time systems |
| Temperature Sensing | Internal sensor (–2 mV/°C gain) or external 10.0-kΩ NTC (103AT-type); ADC input range 0.05–1 V with 125-ms conversion |
| Flash Endurance | 20,000 write cycles, 10-year data retention - sufficient for lifetime calibration updates and profile storage |
| Operating Temperature | –40°C to +85°C ambient - validated for smartphone, tablet, and handheld terminal thermal environments |
Pinout & Package
Tiny 15-ball NanoFree™ (DSBGA) package, 2.610 mm × 1.956 mm body size, 0.5-mm pitch - optimized for ultra-thin mobile PCBs with minimal keep-out area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (E2) | Cell voltage ADC input | Measures pack voltage up to 5.5 V; used for OCV estimation and termination voltage detection |
| SRP (A1) / SRN (B1) | Differential sense inputs | Kelvin-connected to 5–20-mΩ shunt; enables accurate current integration with <10-µV offset |
| TS (D3) | Thermistor voltage sense | ADC input for 10.0-kΩ NTC; requires 18.2-kΩ pullup to BI/TOUT for external temperature monitoring |
| SCL (A3) / SDA (B3) | I²C serial interface | Open-drain, 400-kHz compliant; requires 10-kΩ pullups to VCC for reliable communication with host MCU |
| VCC (D1) / VSS (C1,C2) | LDO output & ground | VCC supplies internal logic at 2.5 V; dual VSS balls reduce ground impedance and improve ADC noise immunity |
| REGIN (E1) | LDO input | Accepts 2.45–4.5 V; decoupled with 0.1-µF ceramic capacitor - powers LDO and enables system-side regulation |
| BAT_LOW (C3) | Configurable SOC alert | Push-pull output, active-high by default; signals low-SOC condition to host without software polling |
| SOC_INT (A2) | State-of-charge interrupt | Open-drain pulse output; triggers host interrupt on SOC threshold crossing or voltage-based shutdown warning |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ Algorithm | Adapts to battery aging, self-discharge, temperature, and rate changes - maintains <1% SOC accuracy over full life cycle |
| Dual Battery Profile Support | Stores two independent impedance models - enables seamless swapping between embedded and removable packs |
| Integrated 2.5-V LDO | Eliminates need for external regulator; powers internal circuitry only - reduces BOM count and board area |
| Configurable Interrupt Outputs | BAT_LOW and SOC_INT pins provide hardware-level alerts - offloads host MCU from continuous SOC polling |
| Low-Power Operation Modes | HIBERNATE (8 µA), SLEEP (23 µA), SNOOZE (62 µA) - extends system standby time without sacrificing gauging fidelity |
Applications
| Smartphones | Tablets |
|---|---|
|
Use Scenario: Real-time battery remaining capacity and time-to-empty reporting during video playback and cellular connectivity. IC Role / Device Role / Timing Role: System-side fuel gauge performing coulomb counting and impedance-based SOC estimation every 1–5 seconds. Use Value: Enables precise low-battery warnings and adaptive power management - prevents unexpected shutdown during critical tasks. |
Use Scenario: Multi-profile battery management when switching between detachable keyboard and standalone tablet mode. IC Role / Device Role / Timing Role: Host-controlled fuel gauge storing and loading separate impedance profiles for embedded and accessory batteries. Use Value: Eliminates recalibration delay after pack swap - maintains SOC continuity across mechanical reconfiguration. |
| Digital Cameras | Handheld Terminals |
|
Use Scenario: High-current burst discharge tracking during rapid photo capture sequences with flash. IC Role / Device Role / Timing Role: Precision current sensing via SRP/SRN with 1-s ADC conversion - captures transient load dynamics. Use Value: Accurate remaining shot count prediction under variable load - improves user confidence in field use. |
Use Scenario: Industrial barcode scanning with frequent wake-from-sleep cycles and intermittent GPS/Wi-Fi usage. IC Role / Device Role / Timing Role: Low-power SLEEP/HIBERNATE mode coordination with host MCU - minimizes quiescent drain during idle periods. Use Value: Extends operational runtime per charge by >15% compared to fixed-interval polling architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27510G3-YZFR | No integrated LDO; requires external 2.5-V supply; same Impedance Track™ core and DSBGA-15 package | Requires additional regulator component and layout area; suitable where system already provides clean 2.5-V rail | Select when minimizing BOM cost outweighs board space savings from integrated LDO |
| BQ27426YZFT | Smaller 12-ball DSBGA package (2.17 × 1.72 mm); 128-byte data flash; identical 400-kHz I²C and –40°C to +85°C rating | Targeted at tighter space constraints; lower flash capacity limits advanced profile customization depth | Select when footprint reduction is critical and dual-profile storage is not required |
Compared with BQ27520YZFR-G4, the BQ27510G3-YZFR removes the LDO to reduce die size but increases system-level component count, while the BQ27426YZFT shrinks the package and flash to fit smaller form factors at the expense of multi-pack flexibility.
Availability
BQ27520YZFR-G4 is available at Aetrix Electronics and suitable for smartphones, tablets, and handheld terminals requiring stable component supply, long-term lifecycle support, and validated fuel gauging performance across temperature and aging conditions.
Supply support for BQ27520YZFR-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 decades of battery management IP development.
The BQ27520YZFR-G4 belongs to TI's Impedance Track™ fuel gauge product line, designed specifically for high-accuracy, system-side battery monitoring in consumer and industrial portable devices with stringent size and power constraints.
FAQ
What is the primary function of the BQ27520YZFR-G4 in a battery management system?
The BQ27520YZFR-G4 serves as a system-side fuel gauge IC that estimates remaining capacity, state-of-charge (SOC), time-to-empty, and battery health using Texas Instruments' Impedance Track™ algorithm. It resides on the host PCB-not inside the battery pack-and interfaces via I²C to report real-time metrics to the host processor. The BQ27520YZFR-G4 does not control charging or protection; it provides intelligence for UI, power management, and diagnostics.
Does the BQ27520YZFR-G4 require an external sense resistor, and what value is recommended?
Yes, the BQ27520YZFR-G4 requires an external low-value sense resistor connected between SRP and SRN pins. Texas Instruments specifies a range of 5 mΩ to 20 mΩ, with 10 mΩ being the typical recommendation. This resistor enables high-precision coulomb counting, and the BQ27520YZFR-G4's integrating ADC achieves <10 µV input offset to minimize measurement error across temperature and current ranges.
Can the BQ27520YZFR-G4 support both embedded and removable battery configurations?
Yes, the BQ27520YZFR-G4 supports both embedded and removable battery packs through dual independent battery profile storage. It automatically detects pack insertion and selects the appropriate impedance model, enabling seamless swapping without recalibration. This capability is implemented in firmware and verified in the BQ27520YZFR-G4 Technical Reference Manual (SLUUA35).
What are the power supply requirements for the BQ27520YZFR-G4?
The BQ27520YZFR-G4 accepts a single supply on REGIN from 2.45 V to 4.5 V and generates its internal 2.5-V rail via an integrated LDO. REGIN must be decoupled with a 0.1-µF ceramic capacitor to VSS, and VCC requires a 1-µF ceramic capacitor. The device draws 8 µA in HIBERNATE mode and 118 µA in NORMAL mode - no external VCC supply is needed, as VCC is strictly an LDO output pin.
How does the BQ27520YZFR-G4 handle temperature measurement?
The BQ27520YZFR-G4 supports three temperature sources: internal sensor (–2 mV/°C gain), external 10.0-kΩ NTC thermistor (103AT-type), or host-reported values. When using an external thermistor, a 18.2-kΩ pullup between BI/TOUT and TS is required. The ADC provides 14–15-bit resolution with 125-ms conversion time and 0.05–1 V input range - ensuring accurate thermal compensation for Impedance Track™ modeling.
BQ27520YZFR-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
BQ27520YZFR-G4 FAQ
1.How can I place an order for BQ27520YZFR-G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27520YZFR-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 BQ27520YZFR-G4 reliable?
The price and inventory of BQ27520YZFR-G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27520YZFR-G4 is usually 5 days.
3.What payment methods are accepted for BQ27520YZFR-G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27520YZFR-G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27520YZFR-G4?
BQ27520YZFR-G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27520YZFR-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 BQ27520YZFR-G4?
For technical support, including BQ27520YZFR-G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27520YZFR-G4 requirements.
6.How does Aetrix verify that BQ27520YZFR-G4 is sourced from the original manufacturer or authorized distributors?
All BQ27520YZFR-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 BQ27520YZFR-G4 meets industry standards.
7.What is the process for return or replacement of BQ27520YZFR-G4?
All BQ27520YZFR-G4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ27520YZFR-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 BQ27520YZFR-G4 part is unused and in its original packaging.
Return procedure for BQ27520YZFR-G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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