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Texas Instruments BQ26220PW
- Part No.:
- BQ26220PW
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ26220PW.pdf
- Description:
- IC BATT MON LI-ION 1CELL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,826
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Product details
Overview
BQ26220PW from Texas Instruments is a multifunction battery monitoring IC designed for integration into rechargeable Li-ion/Li-polymer battery packs. It provides coulometric charge/discharge current integration (3.05 µVH LSB), 11-bit battery voltage ADC (2.44 mV LSB), internal temperature sensing (±4 K accuracy), 32 bytes of flash-backed RAM, and single-wire HDQ interface - enabling precise state-of-charge estimation in portable electronics such as smartphones and PDAs.
For engineers reviewing the BQ26220PW datasheet, BQ26220PW pinout, BQ26220PW application, or BQ26220PW equivalent, key selection considerations include its TSSOP-8 package, 2.8–4.5 V operating range, 30 µA active current, hibernate mode at 600 nA, and support for host-controlled gas gauge algorithms without external crystal or thermistor.
Technical Context
The BQ26220PW implements a precision voltage-to-frequency converter (VFC) with auto-compensated offset (±20 µV) for differential current sensing across SRP/SRN, coupled with a temperature-compensated internal oscillator eliminating external timing components. Its register-mapped HDQ interface enables bidirectional communication using asynchronous return-to-one timing at ≤5 kbit/s.
It integrates 96 bytes of nonvolatile flash (including 32-byte shadow RAM), 8-byte ID ROM with factory-programmed device code (0x22) and LSB gain correction, and dedicated counters for charge (CCR), discharge (DCR), self-discharge (SCR), and time (CTC/DTC), all accessible via 122-byte memory-mapped address space.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.8 V to 4.5 V - supports direct operation from single-cell Li-ion without LDO |
| Active Supply Current | 30 µA - enables low-power runtime in always-on battery monitoring |
| Hibernate Current | 600 nA - preserves RAM data during deep discharge via RBI pin backup |
| Voltage ADC Resolution | 11-bit with 2.44 mV LSB - delivers ±15 LSB max error for accurate cell voltage tracking |
| Current Sensing | Differential VFC with 88–94 Hz/V gain - enables high-precision coulomb counting at ±100 mV input range |
| Temperature Accuracy | ±4 K over −20°C to 70°C - eliminates need for external thermistor in pack-level thermal modeling |
| Interface | Single-wire HDQ - reduces PCB routing complexity and component count vs. I²C/SPI |
| Memory | 32 B RAM + 96 B flash (incl. 8 B ID ROM) - stores calibrated chemistry parameters, serial numbers, and warranty data |
Pinout & Package
TSSOP-8 package (PW suffix), 3.0 mm × 4.4 mm body, 0.65 mm pitch, exposed pad not present. RoHS-compliant, tape-and-reel packaging available with R suffix (e.g., BQ26220PWR).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT | Battery voltage sense input | Direct connection to cell anode for 11-bit ADC measurement; full-scale 5 V optimized for Li-ion |
| RBI | Register backup input | Provides backup power to retain RAM/register state when VCC drops below POR threshold (1.9–2.45 V) |
| VCC | Supply voltage input | Primary power rail; powers all analog/digital blocks; no external regulator required |
| VSS | Ground reference | Common return path for BAT, SRP, SRN, and internal circuitry |
| HDQ | Single-wire HDQ interface | Bidirectional serial port requiring external pull-up; supports command-based register read/write at ≤5 kbit/s |
| GPIO | Programmable digital I/O | Configurable as input or output via HDQ commands; usable for pack status signaling or control |
| SRP | Current sense positive input | Connects to sense resistor high side; polarity determines charge/discharge direction detection |
| SRN | Current sense negative input | Connects to sense resistor low side and pack negative terminal; forms differential pair with SRP |
Key Features
| Feature | Design Value |
|---|---|
| Auto-compensated VFC offset | Eliminates host calibration requirement and maintains <±20 µV offset across VCC/temperature |
| Internal temperature sensor | Enables self-discharge rate adjustment (doubling per +10°C above 25°C) without external components |
| Flash-backed RAM | 32 bytes retained in nonvolatile flash on power loss; survives shorted/deeply discharged battery conditions |
| Programmable WOE thresholds | 7 selectable wake-on-event levels (0.502–3.516 mV) allow adaptive sleep entry based on current activity |
| HDQ break recovery protocol | Robust communication resynchronization after timeout via t(B) ≥190 µs logic-low assertion |
| Factory-programmed ID ROM | Includes device code 0x22 and LSB gain correction factor stored at 0x79 for voltage ADC calibration |
Applications
| Smartphone Battery Management | PDA Power Monitoring |
|---|---|
Use Scenario: Real-time state-of-charge estimation during dynamic load switching (e.g., display backlight, RF transmit bursts). IC Role / Device Role / Timing Role: Coulometric gas gauge IC performing continuous current integration and voltage sampling synchronized to host polling intervals. Use Value: Enables accurate remaining runtime prediction within ±5% error by correlating CCR/DCR counts with calibrated capacity and temperature-corrected self-discharge (SCR). |
Use Scenario: Long-term battery health tracking across firmware updates and usage cycles in handheld computing devices. IC Role / Device Role / Timing Role: Nonvolatile parameter storage node retaining chemistry ID, manufacturing date, and cycle count history in flash memory. Use Value: Supports battery warranty validation and degradation analysis using 96-byte flash (including 32-byte user-programmable area). |
| Wearable Device Pack Integration | Medical Portable Instrument Power |
Use Scenario: Ultra-low-power operation during standby mode with periodic self-discharge compensation. IC Role / Device Role / Timing Role: Hibernate-mode supervisor maintaining RAM integrity via RBI capacitor while drawing only 600 nA from cell. Use Value: Extends shelf life of sealed wearable batteries by accurately modeling temperature-dependent self-discharge without external bias. |
Use Scenario: Critical power logging during clinical procedure interruptions where battery data integrity must survive unexpected shutdowns. IC Role / Device Role / Timing Role: Fault-tolerant monitor preserving calibrated voltage/temperature registers in flash-backed RAM across POR events. Use Value: Ensures post-recovery SoC accuracy by restoring validated parameters from flash after VCC brownout or deep discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ26100PW | Lacks internal temperature sensor; requires external thermistor; no self-discharge compensation logic | Suitable only for ambient-temperature-stable applications without thermal derating needs | Select when cost sensitivity outweighs thermal modeling requirements and external component count is acceptable |
| BQ27220YZFT | WCSP-12 package; adds integrated protection FET drivers; higher integration but no GPIO pin | Targeted for protected single-cell packs with embedded safety logic, not bare monitoring use cases | Choose when system-level protection coordination (e.g., overcurrent cutoff) is required alongside gas gauging |
Compared with BQ26220PW, BQ26100PW omits temperature-aware self-discharge modeling and requires external calibration, while BQ27220YZFT trades GPIO flexibility and TSSOP-8 compatibility for WCSP footprint and protection integration - making BQ26220PW optimal for compact, thermally adaptive, host-controlled battery packs.
Availability
BQ26220PW is available at Aetrix Electronics and suitable for smartphone battery management, PDA power monitoring, wearable device pack integration, and medical portable instrument power applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for BQ26220PW 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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and battery solutions.
The BQ26220PW belongs to TI's battery fuel gauge IC product line, engineered specifically for high-accuracy, low-power, host-coordinated state-of-charge estimation in single-cell Li-ion/Li-polymer battery packs used in portable consumer electronics.
FAQ
What is the primary function of the BQ26220PW in a battery pack?
The BQ26220PW serves as a standalone coulomb-counting gas gauge IC that measures battery voltage (via 11-bit ADC), current (via auto-calibrating VFC), and temperature (via on-die sensor) to compute state-of-charge. It interfaces with a host controller over HDQ to deliver calibrated data - the BQ26220PW does not perform algorithmic SoC calculation itself but provides the raw, temperature-compensated measurements required for accurate host-side estimation.
Does the BQ26220PW require an external crystal oscillator?
No, the BQ26220PW incorporates a high-accuracy internal timebase that eliminates the need for an external crystal oscillator. This integrated oscillator supports all timing functions including VFC conversion, self-discharge counting, and HDQ communication synchronization - reducing BOM cost and board space while maintaining timing stability across −20°C to 70°C.
How does the BQ26220PW handle battery voltage measurement accuracy?
The BQ26220PW performs battery voltage measurement using an 11-bit ADC with 2.44 mV LSB resolution and built-in gain/offset correction. Factory-programmed calibration data (LSB gain correction factor and 4-bit signed offset) is stored in ID ROM at address 0x79 and 0x72, respectively. The host applies these corrections per the formula: Correct VBAT = VBAT × (2.44 + LSB correction) − offset - ensuring accuracy within ±15 LSB across 2.6–4.5 V input range.
What is the role of the RBI pin on the BQ26220PW?
The RBI (Register Backup Input) pin on the BQ26220PW provides backup power to retain RAM and register contents when VCC falls below the power-on-reset threshold (1.9–2.45 V). During hibernate mode, the BQ26220PW draws only 600 nA from RBI, allowing a small capacitor or auxiliary supply to preserve critical battery data - such as accumulated charge/discharge counts - even during deep discharge or temporary cell removal.
Can the BQ26220PW operate directly from a single Li-ion cell?
Yes, the BQ26220PW is explicitly rated for direct operation from a single Li-ion or Li-polymer cell, with a recommended supply range of 2.8 V to 4.5 V. Its low 30 µA active current and 600 nA hibernate current ensure minimal impact on battery runtime, and its internal voltage reference and VFC architecture maintain measurement fidelity across the full cell voltage swing without external regulation.
BQ26220PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion
- 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
BQ26220PW FAQ
1.How can I place an order for BQ26220PW through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ26220PW 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 BQ26220PW reliable?
The price and inventory of BQ26220PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ26220PW is usually 5 days.
3.What payment methods are accepted for BQ26220PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ26220PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ26220PW?
BQ26220PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ26220PW 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 BQ26220PW?
For technical support, including BQ26220PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ26220PW requirements.
6.How does Aetrix verify that BQ26220PW is sourced from the original manufacturer or authorized distributors?
All BQ26220PW 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 BQ26220PW meets industry standards.
7.What is the process for return or replacement of BQ26220PW?
All BQ26220PW units undergo pre-shipment inspection (PSI). If there is an issue with BQ26220PW, 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 BQ26220PW part is unused and in its original packaging.
Return procedure for BQ26220PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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