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Texas Instruments BQ26220PWRDL
- Part No.:
- BQ26220PWRDL
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- -
- Datasheet:
-
BQ26220PWRDL.pdf
- Description:
- IC BATT MON LI-ION 1CELL 8TSSOP
- Quantity:
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Inventory:622
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Product details
Overview
BQ26220PWRDL 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 measurement (2.44 mV LSB), and internal temperature sensing (±4 K accuracy) - all operating from a single-cell supply (2.8 V to 4.5 V) in portable electronics such as smartphones and PDAs.
For engineers reviewing the BQ26220PWRDL datasheet, BQ26220PWRDL pinout, BQ26220PWRDL application, or BQ26220PWRDL equivalent, key selection considerations include its HDQ single-wire interface, 600 nA hibernate current, flash-backed RAM for state retention during deep discharge, differential current sense architecture, and host-dependent gas gauge algorithm implementation.
Technical Context
The BQ26220PWRDL implements a precision voltage-to-frequency converter (VFC) with auto-compensated offset (±20 µV) for current sensing across SRP/SRN, paired with an 11-bit ADC for BAT voltage measurement featuring gain/offset correction via factory-stored ID ROM coefficients. Its internal temperature-compensated oscillator eliminates external crystal requirements.
Operation relies on host-controlled register access via HDQ serial protocol (5 kbit/s, return-to-one), with real-time counters (DCR/CCR/SCR) and time-based registers (DTC/CTC) maintained in 32-byte flash-shadowed RAM. Self-discharge estimation uses temperature-dependent SCR scaling (doubling per +10°C above 25°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.8 V to 4.5 V - enables direct operation from single Li-ion cell without LDO |
| Current Sense Resolution | 3.05 µVH LSB - supports accurate coulomb counting with 0.02 Ω sense resistor |
| Battery Voltage ADC | 11-bit, 2.44 mV LSB - optimized for 0–5 V full-scale, calibrated via ID ROM gain/offset data |
| Operating Current | 30 µA typical - low quiescent draw for continuous monitoring in battery-powered systems |
| Hibernate Current | 600 nA - preserves RAM state via RBI pin during pack storage or deep discharge |
| Temperature Accuracy | ±4 K - die temperature reported in Kelvin via TMPH/TMPL registers for self-discharge modeling |
| Memory Resources | 32 bytes RAM + 96 bytes flash (64 user + 32 shadow) + 8 bytes ID ROM - stores chemistry, serial, calibration, and runtime state |
Pinout & Package
Packaged in an 8-lead TSSOP (PW), the BQ26220PWRDL integrates battery voltage sensing, differential current measurement, single-wire communication, and programmable I/O in a compact surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT | Battery voltage sense input | Direct connection to pack positive terminal for 11-bit ADC measurement (2.44 mV LSB) |
| RBI | Register backup input | Supplies backup current (≤25 nA) to retain RAM during VCC < 1.9 V; enables hibernate mode |
| VCC | Supply voltage input | Primary power rail (2.8–4.5 V); powers all analog/digital blocks including VFC and ADC |
| VSS | Ground reference | System ground return for all analog measurements and digital logic |
| HDQ | Single-wire HDQ interface | Bidirectional serial port (5 kbit/s) for register read/write, flash programming, and sleep/hibernate control |
| GPIO | Programmable I/O port | Configurable as input or output via HDQ commands; supports system-level signaling or status indication |
| SRP | Current sense positive input | Connects to high-side of sense resistor; polarity determines charge (VSRP > VSRN) vs. discharge |
| SRN | Current sense negative input | Connects to low-side of sense resistor; differential input to VFC with auto-offset compensation |
Key Features
| Feature | Design Value |
|---|---|
| Differential current sensing | VFC-based measurement with ±20 µV auto-compensated offset eliminates host calibration overhead |
| Flash-shadowed RAM | 32 bytes of RAM backed by flash enable nonvolatile retention of SOC, cycle count, and fault logs during pack removal |
| Internal temperature sensor | Die temperature reporting (±4 K) enables accurate self-discharge modeling without external thermistor |
| Single-wire HDQ interface | Reduces PCB routing complexity and connector pin count versus I²C/SPI; supports break-detect recovery |
| Low-power hibernate mode | 600 nA current draw with RBI-supplied RAM retention allows multi-year storage without data loss |
Applications
| Smartphone Battery Pack | PDA Power Management |
|---|---|
Use Scenario: Real-time state-of-charge tracking and remaining runtime estimation in consumer handheld devices with single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Gas gauge monitor providing coulomb-counted DCR/CCR values, voltage-corrected BAT readings, and temperature-scaled SCR to host PMIC firmware. Use Value: Enables accurate battery fuel gauging without external crystal or thermistor, reducing BOM cost and board space. | Use Scenario: Battery health monitoring and safe charging control in legacy PDA platforms with limited MCU resources. IC Role / Device Role / Timing Role: Standalone battery parameter acquisition unit interfacing via HDQ to low-pin-count host controller. Use Value: Delivers calibrated voltage (2.44 mV LSB), current (3.05 µVH), and temperature (±4 K) data using only one bidirectional signal line. |
| Wearable Device Battery | Medical Portable Monitor |
Use Scenario: Compact, ultra-low-power battery monitoring in hearables and fitness trackers requiring long shelf life and minimal standby drain. IC Role / Device Role / Timing Role: Hibernate-mode supervisor maintaining SOC integrity during months of storage via RBI-supplied RAM retention. Use Value: 600 nA hibernate current ensures battery state remains intact over extended off-periods without external backup capacitor. | Use Scenario: Regulatory-compliant battery safety logging in Class II medical devices requiring traceable capacity history and thermal derating. IC Role / Device Role / Timing Role: Nonvolatile data logger storing manufacturer ID, cycle count, and temperature-corrected discharge profiles in 96-byte flash. Use Value: Factory-programmed ID ROM and user-flash support audit-ready battery lifecycle records meeting IEC 62304 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ26100PWR | Lacks internal temperature sensor; requires external thermistor; no flash memory; only 16-byte RAM | Suitable for cost-sensitive designs where self-discharge modeling is not required | Choose BQ26100PWR only if temperature compensation and nonvolatile state retention are unnecessary |
| BQ27220YZFT | Integrated fuel gauge algorithm; higher integration (no host register management); different package (DSBGA) | Targeted at systems needing autonomous gas gauge output (SOC%, mAh) rather than raw counter data | Select BQ27220YZFT when host MCU lacks firmware resources to implement coulomb counting and temperature compensation logic |
Compared with BQ26220PWRDL, BQ26100PWR reduces functionality to basic voltage/current monitoring without temperature or memory, while BQ27220YZFT shifts intelligence to the IC itself - making BQ26220PWRDL optimal for host-controlled, flash-configurable battery management in space-constrained portable designs.
Availability
BQ26220PWRDL is available at Aetrix Electronics and suitable for smartphone battery packs, PDA power subsystems, wearable energy monitoring, and medical portable monitors requiring stable component supply and long-term lifecycle support.
Supply support for BQ26220PWRDL 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.
The BQ26220PWRDL belongs to TI's bq™ family of battery monitor ICs, engineered specifically for host-managed, high-accuracy coulomb counting in single-cell Li-ion applications where minimal external components and ultra-low hibernate current are critical.
FAQ
What is the primary function of the BQ26220PWRDL in a battery pack?
The BQ26220PWRDL serves as a host-managed battery monitor IC that performs coulometric charge/discharge current integration, battery voltage measurement, and die temperature sensing. It delivers raw counter values (DCR, CCR, SCR) and calibrated ADC readings to the host controller, which implements the gas gauge algorithm. The BQ26220PWRDL itself does not compute state-of-charge but provides the foundational measurements required for accurate fuel gauging in single-cell Li-ion packs.
Does the BQ26220PWRDL require an external crystal oscillator?
No, the BQ26220PWRDL features a high-accuracy internal timebase that eliminates the need for an external crystal oscillator. Its temperature-compensated precision oscillator provides timing for the VFC, ADC, and internal counters, enabling full functionality with zero external timing components - a key advantage for space-constrained portable designs.
How does the BQ26220PWRDL handle battery voltage calibration?
The BQ26220PWRDL stores factory-trimmed gain and offset correction factors in its 8-byte ID ROM (address 0x79 for LSB gain, bits 3–7 of BATH for offset). The host controller applies these values to raw BATL/BATH register readings using the formula: Correct VBAT = VBAT × (2.44 + LSB correction factor) − offset. This enables system-level calibration without trimming resistors or host firmware calibration routines.
What is the role of the RBI pin on the BQ26220PWRDL?
The RBI (Register Backup Input) pin on the BQ26220PWRDL supplies backup current (≤25 nA) to maintain RAM and register contents when VCC drops below the power-on reset threshold (1.9–2.45 V). This enables hibernate mode operation with 600 nA total current draw, preserving battery state data during deep discharge or long-term storage - a critical capability for portable devices with intermittent usage patterns.
Can the BQ26220PWRDL be used with multi-cell battery configurations?
No, the BQ26220PWRDL is explicitly designed for single-cell Li-ion or Li-polymer battery packs. Its BAT pin measures voltage referenced to VSS with a 0–5 V full-scale range optimized for 2.8–4.5 V operation, and its VFC input range (±100 mV) assumes a single sense resistor in the pack's main current path. Multi-cell configurations require series-connected monitors or dedicated multi-cell ICs like the BQ769x0 family.
BQ26220PWRDL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Battery Chemistry:
- -
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
BQ26220PWRDL FAQ
1.How can I place an order for BQ26220PWRDL through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ26220PWRDL 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 BQ26220PWRDL reliable?
The price and inventory of BQ26220PWRDL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ26220PWRDL is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ26220PWRDL transactions.
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BQ26220PWRDL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ26220PWRDL 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 BQ26220PWRDL?
For technical support, including BQ26220PWRDL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ26220PWRDL requirements.
6.How does Aetrix verify that BQ26220PWRDL is sourced from the original manufacturer or authorized distributors?
All BQ26220PWRDL 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 BQ26220PWRDL meets industry standards.
7.What is the process for return or replacement of BQ26220PWRDL?
All BQ26220PWRDL units undergo pre-shipment inspection (PSI). If there is an issue with BQ26220PWRDL, 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 BQ26220PWRDL part is unused and in its original packaging.
Return procedure for BQ26220PWRDL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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