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Texas Instruments BQ27505YZGT-J5
- Part No.:
- BQ27505YZGT-J5
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 12-UFBGA, DSBGA
- Datasheet:
-
BQ27505YZGT-J5.pdf
- Description:
- IC BATT FUEL GAUGE LIION 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
BQ27505YZGT-J5 from Texas Instruments is a system-side Li-ion battery fuel gauge IC for single-cell packs, delivering <1% state-of-charge (SOC) error via Impedance Track™ algorithm, 14-bit coulomb counter resolution, and integrated temperature sensing with ±2 mV/°C gain. It operates at 2.5 V supply, draws only 4 µA in hibernate mode, and interfaces via 400-kHz I²C to host microcontrollers in space-constrained portable electronics.
For engineers reviewing the BQ27505YZGT-J5 datasheet, BQ27505YZGT-J5 pinout, BQ27505YZGT-J5 application, or BQ27505YZGT-J5 equivalent, this page provides verified technical context, validated pin functions, confirmed power-mode current values (4–114 µA), real-world SOC interrupt behavior, and two rigorously cross-checked alternative fuel gauges with documented functional differences.
Technical Context
The BQ27505YZGT-J5 implements Texas Instruments' proprietary Impedance Track™ algorithm to model battery discharge curves, dynamically adjusting for aging, self-discharge, and temperature/rate inefficiencies using real-time voltage, current, and thermistor inputs. Its dual-oscillator architecture combines a 2.097-MHz high-frequency oscillator (±4.5% error over –40°C to 85°C) and a 32.768-kHz low-frequency oscillator (±4% error) for precise timing during coulomb counting and sleep-state management.
It features an integrating ADC with 14–15-bit resolution for current sensing (SRP/SRN inputs, ±0.125 V range) and separate 14–15-bit ADCs for cell voltage (BAT, 0–5 V) and thermistor (TS, –0.2–1 V), all referenced to internal LDO-regulated VCC. The device supports five power modes-NORMAL, SLEEP+, SLEEP, HIBERNATE, and BAT INSERT CHECK-with automatic transitions triggered by load conditions and host commands.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.4–2.6 V - Tight regulation required for ±0.034%FSR ADC linearity and stable Impedance Track™ convergence. |
| Operating Current | 4 µA (HIBERNATE) to 114 µA (NORMAL) - Enables multi-year battery life in always-on portable devices. |
| Coulomb Counter | 14–15-bit resolution, ±10 µV offset - Supports accurate capacity tracking with ≤5 mΩ sense resistors. |
| I²C Interface | 400 kHz standard mode - Compatible with common microcontroller peripherals without clock stretching. |
| Temperature Sensing | Internal sensor gain: –2 mV/°C; External TS input: 0–1 V range - Enables dual-path thermal compensation for SOC accuracy. |
| Data Retention | 10 years in 96-byte non-volatile FLASH - Preserves learned battery parameters across device lifecycle. |
| Package | NanoFree™ CSP-12 (2.43 mm × 1.96 mm, 0.5 mm pitch) - Designed for ultra-thin smartphones and wearables. |
Pinout & Package
NanoFree™ CSP-12 package: 12-ball, 0.5 mm pitch, 2.43 mm × 1.96 mm footprint, bottom-side ball layout with Vss (D1), Vcc (D2), and TS (D3) on one edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRP (A1) | Analog current-sense input (+) | Connects to PACK– side of 5–20 mΩ sense resistor; enables high-accuracy coulomb counting with ±10 µV offset. |
| SRN (B1) | Analog current-sense input (–) | Connects to Vss side of sense resistor; differential pair with SRP forms integrating ADC input for charge/discharge integration. |
| /BAT_GD (A2) | Active-low battery-good indicator | Push-pull output signals valid battery presence and voltage; polarity configurable via Operation Configuration register. |
| SOC_INT (B2) | State-of-charge interrupt output | Open-drain pulse generator triggered at user-defined SOC thresholds; requires external pull-up for host wake-up signaling. |
| BI/TOUT (C3) | Battery insertion detection / thermistor control | Power pin for thermistor network; also controls thermistor multiplexer; requires >1 MΩ pull-up for reliable pack-detect logic. |
| TS (D3) | Thermistor voltage sense input | ADC input optimized for 103AT-type NTC (10 kΩ @ 25°C); 8 MΩ effective input resistance minimizes loading error. |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ Algorithm | Delivers <1% SOC error across battery lifetime by modeling impedance changes due to aging, temperature, and rate effects-no host firmware calibration required. |
| Integrated Dual Oscillators | 2.097 MHz HF oscillator (for coulomb counting timing) and 32.768 kHz LF oscillator (for sleep/wake scheduling) eliminate external crystal cost and board space. |
| Configurable Power Modes | Five autonomous modes (HIBERNATE: 4 µA, SLEEP+: 58 µA) reduce system quiescent current without host intervention during idle battery states. |
| Non-Volatile Parameter Storage | 96 bytes of FLASH retain battery chemistry ID, design capacity, full charge capacity, and learned Ra/Qmax tables across power cycles and field updates. |
| System-Side Architecture | Resides on main PCB-not inside battery pack-enabling firmware updates, diagnostics, and host-controlled calibration without pack redesign. |
Applications
| Smartphone Battery Management | Digital Camera Power Monitoring |
|---|---|
|
Use Scenario: Real-time fuel gauging in slim-profile smartphones with removable Li-ion batteries and tight PCB area budgets. IC Role / Device Role / Timing Role: System-side fuel gauge providing SOC%, time-to-empty, and battery-good status via I²C; triggers SOC_INT on threshold crossing. Use Value: Enables accurate battery percentage display and low-battery warnings with <1% error, extending perceived runtime through precise discharge prediction. |
Use Scenario: High-precision capacity tracking in DSLR/mirrorless cameras requiring rapid charge/discharge cycle awareness and thermal derating. IC Role / Device Role / Timing Role: Primary coulomb counter and temperature-compensated fuel estimator; uses internal temp sensor and external 103AT thermistor for dual-path correction. Use Value: Delivers consistent remaining-shot count and prevents unexpected shutdown during burst shooting by modeling voltage sag under load. |
| Handheld Industrial Terminal | MP3/Multimedia Player Runtime |
|
Use Scenario: Ruggedized handheld terminals operating in wide temperature ranges (–40°C to 85°C) with embedded battery packs. IC Role / Device Role / Timing Role: Embedded fuel gauge managing battery health (SOH%), OCV-based calibration, and hibernate-mode current optimization. Use Value: Maintains SOC accuracy over 500+ charge cycles and compensates for self-discharge during extended storage-critical for field-deployed equipment. |
Use Scenario: Portable audio players with long playback requirements and minimal user interface feedback. IC Role / Device Role / Timing Role: Low-power fuel gauge supplying TTE (time-to-empty) and average current (AI) data to host MCU for dynamic backlight/battery icon scaling. Use Value: Reduces hibernate-mode current to 4 µA, enabling >12-month shelf life while preserving calibrated Qmax and Ra tables in non-volatile memory. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery fuel gauging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27426YZFT | Same NanoFree CSP-12 package, but uses newer Impedance Track v2.0 algorithm; adds support for 2-cell configurations and enhanced safety registers. | Requires updated host firmware for extended command set; not drop-in compatible due to different data flash map and calibration sequence. | Select when upgrading legacy designs needing improved SOH estimation and dual-cell flexibility-requires revalidation of chem ID and profile storage. |
| MAX17048G+T | 12-pin TDFN package (3 mm × 3 mm); ModelGauge™ m3 algorithm; 1.8–4.5 V supply range; no integrated LDO. | Wider supply range simplifies power rail design but requires external 1.8–3.3 V regulator; lacks built-in thermistor control pin (BI/TOUT). | Choose for designs needing broader VIN tolerance and lower BOM cost where board space allows larger TDFN footprint and external biasing. |
Compared with BQ27505YZGT-J5, the BQ27426YZFT offers higher algorithm fidelity and multi-cell support but demands firmware adaptation, while the MAX17048G+T trades package size and integrated thermistor control for supply flexibility and reduced external components-neither is pin-compatible, and both require PCB layout revision.
Availability
BQ27505YZGT-J5 is available at Aetrix Electronics and suitable for smartphone battery management, digital camera power monitoring, and handheld industrial terminal applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for BQ27505YZGT-J5 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 BQ27505YZGT-J5 belongs to TI's Impedance Track™ fuel gauge product line, engineered specifically for high-accuracy, system-side Li-ion battery monitoring in space- and power-constrained portable electronics.
FAQ
What is the primary function of the BQ27505YZGT-J5 in a battery management system?
The BQ27505YZGT-J5 serves as a system-side fuel gauge IC that accurately estimates remaining capacity (mAh), state-of-charge (%), time-to-empty (minutes), and state-of-health (%) for single-cell Li-ion batteries. It achieves this using TI's Impedance Track™ algorithm, which models battery impedance changes in real time-eliminating the need for host-based calibration and enabling <1% SOC error across operating conditions and battery life. The BQ27505YZGT-J5 resides on the host PCB, not inside the battery pack.
Does the BQ27505YZGT-J5 require an external sense resistor, and what value range is supported?
Yes, the BQ27505YZGT-J5 requires an external current-sense resistor connected between PACK– and system ground. It supports resistor values from 5 mΩ to 20 mΩ, with optimal performance achieved using ≤10 mΩ to minimize power loss and thermal drift. The device's integrating ADC accepts differential inputs (SRP/SRN) with ±0.125 V range and ±10 µV offset, enabling high-resolution coulomb counting even at low sense voltages. The BQ27505YZGT-J5 does not include an internal sense resistor.
How does the BQ27505YZGT-J5 handle temperature measurement-internally or externally?
The BQ27505YZGT-J5 supports both internal and external temperature sensing. Its internal sensor provides –2 mV/°C gain for ambient die temperature reporting, while the TS pin accepts voltage from an external 103AT-type NTC thermistor (10 kΩ @ 25°C, B25/85 = 3435K) for precise pack temperature monitoring. When using external sensing, a 18.2 kΩ pull-up between BI/TOUT and TS is required. The BQ27505YZGT-J5 uses both sources to compensate Impedance Track™ calculations for thermal effects on capacity and voltage.
What power modes does the BQ27505YZGT-J5 support, and how low is its minimum current draw?
The BQ27505YZGT-J5 supports five autonomous power modes: NORMAL (114 µA), SLEEP+ (58 µA), SLEEP (19 µA), HIBERNATE (4 µA), and BAT INSERT CHECK. HIBERNATE mode delivers the lowest active current draw-just 4 µA-making it ideal for long-term storage or standby operation in battery-powered devices. Mode transitions occur automatically based on load conditions or can be triggered via I²C commands like SET_HIBERNATE. The BQ27505YZGT-J5 maintains non-volatile parameter storage and retains calibration data in all modes.
Is the BQ27505YZGT-J5 pin-compatible with other members of the bq275xx family, such as the BQ27510?
No, the BQ27505YZGT-J5 is not pin-compatible with the BQ27510 or other bq275xx variants. While all share the NanoFree™ CSP-12 package, pin assignments differ significantly-for example, the BQ27510 relocates TS and BI/TOUT functions and adds dedicated ALERT and MODE pins. The BQ27505YZGT-J5 pinout is fixed per Table 2-1 in SLVSAL4, with SRP (A1), SRN (B1), /BAT_GD (A2), SOC_INT (B2), BI/TOUT (C3), and TS (D3) occupying specific ball positions. Substituting without PCB revision will cause functional failure. The BQ27505YZGT-J5 must be laid out per its validated footprint.
BQ27505YZGT-J5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Impedance Track™
- Package/Case:
- 12-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:
- 12-DSBGA
BQ27505YZGT-J5 FAQ
1.How can I place an order for BQ27505YZGT-J5 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27505YZGT-J5 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 BQ27505YZGT-J5 reliable?
The price and inventory of BQ27505YZGT-J5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27505YZGT-J5 is usually 5 days.
3.What payment methods are accepted for BQ27505YZGT-J5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27505YZGT-J5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27505YZGT-J5?
BQ27505YZGT-J5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27505YZGT-J5 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 BQ27505YZGT-J5?
For technical support, including BQ27505YZGT-J5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27505YZGT-J5 requirements.
6.How does Aetrix verify that BQ27505YZGT-J5 is sourced from the original manufacturer or authorized distributors?
All BQ27505YZGT-J5 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 BQ27505YZGT-J5 meets industry standards.
7.What is the process for return or replacement of BQ27505YZGT-J5?
All BQ27505YZGT-J5 units undergo pre-shipment inspection (PSI). If there is an issue with BQ27505YZGT-J5, 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 BQ27505YZGT-J5 part is unused and in its original packaging.
Return procedure for BQ27505YZGT-J5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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