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Texas Instruments BQ26500PWG4
- Part No.:
- BQ26500PWG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ26500PWG4.pdf
- Description:
- IC FUEL GAUGE LI-ION 1CL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,273
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Product details
Overview
BQ26500PWG4 from Texas Instruments is a standalone single-cell Li-Ion/Li-Pol battery gas gauge IC that reports accurate state-of-charge (SoC), voltage (±20 mV), temperature (±3 K), and time-to-empty without host processor calculations. It integrates coulometric current sensing via differential SRP/SRN inputs, features internal oscillator eliminating external crystal, and operates in four low-power modes down to 1.5 µA hibernate current. It targets space-constrained portable devices such as PDAs and smart phones.
For engineers reviewing the BQ26500PWG4 datasheet, BQ26500PWG4 pinout, BQ26500PWG4 application, or BQ26500PWG4 equivalent, key selection criteria include its HDQ one-wire interface (5 kbits/s), auto-calibrating voltage-to-frequency converter (VFC) with <15 µV offset, EEPROM-programmable digital magnitude filter, and support for battery pack backup via RBI pin.
Technical Context
The BQ26500PWG4 uses a fully differential, dynamically balanced voltage-to-frequency converter (VFC) for continuous charge/discharge integration across a sense resistor, with automatic internal offset cancellation-no user calibration required. Its ADC measures battery voltage (1 mV resolution) and die temperature (0.25 K resolution), both updated every 2 seconds.
It implements autocalibration during full discharge cycles from NAC = LMD to EDV1 threshold, applying temperature- and discharge-rate compensation to nominal available capacity (NAC) to generate temperature-compensated CACT and discharge-compensated CACD registers. The HDQ serial interface operates at 5 kbits/s with defined break, host-bit, and device-bit timing windows per TI SLUS567A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.6 V to 4.5 V - powers directly from single-cell Li-Ion/Li-Pol without regulator |
| Current Measurement Range | ±100 mV across sense resistor - supports typical 20 mΩ shunts for ±5 A full-scale current |
| Voltage Accuracy | ±20 mV - enables reliable end-of-discharge detection at EDV thresholds |
| Temperature Accuracy | ±3 K - sufficient for self-discharge and rate compensation in consumer battery packs |
| Active Current | < 100 µA - minimizes impact on battery runtime during active SoC reporting |
| Hibernate Current | < 1.5 µA - extends shelf life in shipped battery packs |
| HDQ Interface Speed | 5 kbits/s - reduces microcontroller polling overhead vs. I²C/SPI |
| VFC Offset | < 15 µV - ensures sub-mAh integration accuracy without factory calibration |
Pinout & Package
Package: 8-pin TSSOP (PW), 3.0 mm × 4.4 mm, 0.65 mm pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RBI | Register backup input | Provides capacitor-based VCC hold-up to retain RAM data when main supply drops below POR threshold (2.05–2.55 V) |
| VCC | Power supply input | Accepts 2.6–4.5 V directly from battery; powers all internal blocks including VFC and ADC |
| VSS | Ground reference | Low-impedance return path for SRP/SRN differential sensing and HDQ/GPIO I/O |
| HDQ | Bi-directional serial interface | Single-wire 5-kbits/s HDQ bus with internal pull-down - enters sleep mode automatically on system power-off |
| GPIO | Programmable I/O port | Configurable as open-drain output or input; supports EEPROM programming at 20–22 V |
| BAT | Battery voltage sense | High-impedance (10 MΩ) input for monitoring cell voltage with 1 mV resolution |
| SRP | Positive current sense input | Differential input (with SRN) for VFC; accepts ±100 mV full-scale range with Kelvin connection requirement |
| SRN | Negative current sense input | Differential complement to SRP; PCB layout must avoid shared VSS paths with load current to prevent offset errors |
Key Features
| Feature | Design Value |
|---|---|
| Auto-calibrating VFC | Eliminates need for factory offset trim; achieves <15 µV residual offset for mAh-level integration accuracy |
| Internal time-base | On-chip oscillator replaces external crystal - saves board space and BOM cost in compact battery packs |
| Four low-power modes | Ship mode (<1.7 µA) and hibernate (<1.5 µA) enable multi-year shelf life without battery drain |
| HDQ one-wire interface | Reduces host GPIO count and simplifies interconnect vs. I²C/SPI - ideal for tight-space handheld applications |
| Digital magnitude filter (DMF) | EEPROM-programmable threshold (6 µV steps) ignores sub-threshold noise, preventing false capacity drift during idle |
| RAM register backup | RBI pin + external capacitor preserves NAC, LMD, and FLAGS across brownouts - maintains SoC continuity |
Applications
| Smartphone Battery Management | PDA Power Monitoring |
|---|---|
Use Scenario: Real-time SoC and time-to-empty reporting during mixed-use workloads (calls, web, video). IC Role / Device Role / Timing Role: Standalone gas gauge providing compensated NAC, CACD, and CACT registers via HDQ; eliminates host CPU burden for coulomb counting. Use Value: Enables accurate battery percentage display and low-battery warnings without firmware math - improves user experience and reduces host processing load. | Use Scenario: Long-term capacity tracking across hundreds of charge/discharge cycles in enterprise PDAs. IC Role / Device Role / Timing Role: Autonomous learning of Last Measured Discharge (LMD) during full discharges; applies temperature/self-discharge compensation to NAC. Use Value: Maintains >95% SoC accuracy over battery lifetime without periodic recalibration - extends usable service life. |
| Digital Camera Power System | MP3 Player Battery Pack |
Use Scenario: Fast transient current detection during flash charging and image capture bursts. IC Role / Device Role / Timing Role: Differential SRP/SRN sensing with 2 s voltage/temperature update and real-time CHGS flag assertion. Use Value: Detects charge state transitions within milliseconds - enables precise flash timing and prevents overcharge during rapid cycling. | Use Scenario: Shelf-life preservation during retail distribution and consumer storage. IC Role / Device Role / Timing Role: Ship mode activation (ICC < 1.7 µA) and hibernate mode (ICC < 1.5 µA) via MODE register command. Use Value: Limits annual self-discharge to <5% - ensures full functionality upon first power-on after 12+ months in storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27200DRVR | Uses I²C interface (not HDQ); includes integrated sense resistor; lower hibernate current (1 µA) | Requires I²C host interface and lacks RBI backup - less suitable for legacy HDQ systems or long brownout retention needs | Select when I²C is preferred and board space allows integrated sense resistor; not drop-in for BQ26500PWG4 HDQ designs |
| BQ27425YZFT | Higher accuracy (±1% SoC), supports LiFePO₄ chemistry, adds fuel-gauge algorithm offload to host | Requires firmware integration for Impedance Track™; no native HDQ support - mandates interface redesign | Choose for next-gen designs needing tighter SoC tolerance and multi-chemistry flexibility; not compatible with existing HDQ infrastructure |
Compared with BQ26500PWG4, BQ27200DRVR offers lower quiescent current but requires I²C and lacks RBI backup, while BQ27425YZFT delivers superior SoC accuracy and algorithmic intelligence at the cost of interface compatibility and added host software complexity.
Availability
BQ26500PWG4 is available at Aetrix Electronics and suitable for smartphone battery packs, PDA power systems, digital camera energy management, and MP3 player battery modules requiring stable component supply across extended production lifecycles.
Supply support for BQ26500PWG4 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 precision analog ICs.
The BQ26500PWG4 belongs to TI's bqJUNIOR family of standalone battery fuel gauges, designed specifically for cost-sensitive, space-constrained portable Li-Ion/Li-Pol applications where minimal host intervention and ultra-low power are critical.
FAQ
What is the primary function of the BQ26500PWG4 in a battery pack?
The BQ26500PWG4 serves as a standalone fuel gauge IC that autonomously measures and reports battery state-of-charge, voltage, temperature, and time-to-empty using integrated coulometric integration and compensation algorithms. It eliminates the need for host processor calculations by delivering ready-to-use values via its HDQ interface - a core capability confirmed in TI's SLUS567A datasheet.
Does the BQ26500PWG4 require external calibration for current sensing?
No, the BQ26500PWG4 does not require external calibration. Its voltage-to-frequency converter (VFC) includes automatic internal offset cancellation, and the datasheet explicitly states "No offset calibration" under FEATURES and "NO CALIBRATION IS REQUIRED" in APPLICATION INFORMATION. Residual offset remains below 15 µV, ensuring mAh-level accuracy without user intervention.
How does the BQ26500PWG4 maintain register data during power loss?
The BQ26500PWG4 uses the RBI (Register Backup Input) pin with an external capacitor to retain RAM register contents - including NAC, LMD, and FLAGS - when VCC drops below the POR threshold (2.05–2.55 V). As described in SLUS567A Section "RBI Input", this backup mechanism preserves state-of-charge continuity across brownouts and short interruptions, a feature unique to the BQ26500PWG4 among early TI gas gauges.
What communication interface does the BQ26500PWG4 use, and what are its timing characteristics?
The BQ26500PWG4 uses the HDQ one-wire bi-directional serial interface operating at 5 kbits/s. Key timing parameters include break timing (190 µs), host bit window (190 µs), and device response time (190–320 µs), all specified in the SLUS567A Electrical Characteristics table and Figure 1. This interface reduces host pin count and simplifies PCB routing compared to I²C or SPI.
Can the BQ26500PWG4 support battery chemistries other than Li-Ion or Li-Pol?
No, the BQ26500PWG4 is explicitly designed for single-cell Li-Ion and Li-Pol batteries only. The datasheet DESCRIPTION states it is "targeted at... single-cell Li-Ion and Li-Pol battery capacity monitoring", and all compensation algorithms (temperature, self-discharge, discharge rate) are tuned for those chemistries. It does not support LiFePO₄, NiMH, or lead-acid profiles.
BQ26500PWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- bqJUNIOR™
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Fault Protection:
- -
- Interface:
- HDQ
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
BQ26500PWG4 FAQ
1.How can I place an order for BQ26500PWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ26500PWG4 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 BQ26500PWG4 reliable?
The price and inventory of BQ26500PWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ26500PWG4 is usually 5 days.
3.What payment methods are accepted for BQ26500PWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ26500PWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ26500PWG4?
BQ26500PWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ26500PWG4 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 BQ26500PWG4?
For technical support, including BQ26500PWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ26500PWG4 requirements.
6.How does Aetrix verify that BQ26500PWG4 is sourced from the original manufacturer or authorized distributors?
All BQ26500PWG4 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 BQ26500PWG4 meets industry standards.
7.What is the process for return or replacement of BQ26500PWG4?
All BQ26500PWG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ26500PWG4, 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 BQ26500PWG4 part is unused and in its original packaging.
Return procedure for BQ26500PWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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