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Texas Instruments BQ77PL900DLR
- Part No.:
- BQ77PL900DLR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
BQ77PL900DLR.pdf
- Description:
- IC BATT PROT LI-ION 5-10C 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,621
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Product details
Overview
BQ77PL900DLR from Texas Instruments is a 5–10 series-cell lithium-ion/lithium-polymer battery protector and analog front end (AFE) with integrated PMOS FET drive, dual LDOs (5 V/25 mA and 3.3 V/25 mA), I²C interface, and programmable overvoltage/undervoltage/overcurrent/short-circuit protection. It operates from 7 V to 50 V supply and draws only 450 µA typical quiescent current, enabling use in cordless power tools and UPS systems.
For engineers reviewing the BQ77PL900DLR datasheet, BQ77PL900DLR pinout, BQ77PL900DLR application, or BQ77PL900DLR equivalent, this page delivers verified technical context, confirmed pin functions, real-world protection thresholds (e.g., 4.15–4.5 V OV default, 1.4–2.9 V UV default), cell-balancing capability up to 10 cells, and host-control mode via I²C for fuel gauge integration.
Technical Context
The BQ77PL900DLR implements autonomous safety protection using EEPROM-programmable thresholds and delay times for overvoltage, undervoltage, overcurrent discharge, and short-circuit detection - all without external components. Its internal charge pump enables high-side FET gate drive across full 50 V pack voltage range.
As an AFE, it provides precision analog outputs: VOUT for individual cell voltage measurement (±2% gain error, 0.975 V or 1.2 V full-scale), IOUT for charge/discharge current sensing (±3 mV offset), and TOUT/TIN for thermistor-based temperature monitoring with 50–150 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | 5 to 10 series Li-ion/LiPo cells - enables scalable battery pack design from 18 V to 42 V nominal. |
| Supply Voltage Range | 7 V to 50 V - supports wide-input battery packs including 10S configurations up to 42 V nominal. |
| Quiescent Current | 450 µA typical - extends standby life in always-on battery management systems. |
| Protection Thresholds | OV: 4.15–4.5 V/cell; UV: 1.4–2.9 V/cell; OCD: 10–85 mV across 1-mΩ sense resistor - configurable via EEPROM. |
| LDO Outputs | 5 V/25 mA and 3.3 V/25 mA - powers host microcontrollers or external sensors without auxiliary regulators. |
| Interface | I²C-compatible serial interface with open-drain SDATA/SCLK - enables host-controlled cell balancing and status readback. |
| Cell Voltage Accuracy | ±2% full-scale error at 0.975 V or 1.2 V output - supports precise state-of-charge estimation in host firmware. |
Pinout & Package
Package: SSOP-48 (DL package, 10.2 mm × 12.8 mm, 0.635 mm pitch). Pin count: 48 terminals, including 11 VC pins for cell voltage monitoring (VC1–VC11), dual FET drives (CHG, DSG), I²C interface (SCLK, SDATA), dual LDO outputs (VREG1, VREG2), and dedicated thermal sensing (TIN, TOUT).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT | Primary power input | Accepts 7–50 V supply; powers internal circuitry when PACK is disconnected. |
| PACK | High-side pack voltage reference | Connects to battery pack positive; used for overvoltage/undervoltage detection relative to cell stack. |
| VC1–VC11 | Cell voltage sensing inputs | VC1–VC10 monitor individual cell voltages; VC11 is stack ground reference - enables per-cell monitoring up to 10 cells. |
| CHG / DSG | PMOS FET gate drivers | Directly control external high-side charge and discharge FETs - no level-shifting required. |
| SCLK / SDATA | I²C bidirectional interface | Open-drain signals with internal 10-kΩ pullups to VLOG - support host-controlled configuration and telemetry. |
| VREG1 / VREG2 | Regulated power outputs | 5 V/25 mA and 3.3 V/25 mA outputs - eliminate need for external LDOs in host subsystems. |
| TIN / TOUT | Thermal sensing interface | TOUT supplies bias current to NTC thermistor; TIN reads resulting voltage - enables overtemperature shutdown at 150°C. |
| XALERT / XRST | Status and reset signaling | XALERT asserts low on protection event; XRST is active-low power-on reset with internal 3-kΩ pullup - simplifies system-level fault handling. |
Key Features
| Feature | Design Value |
|---|---|
| Stand-alone protection mode | Autonomous overvoltage, undervoltage, overcurrent, and short-circuit response without host MCU - reduces system BOM and firmware complexity. |
| Programmable protection parameters | EEPROM-stored OV/UV/OCD/SCD thresholds and delay times - allows field-tuning for specific cell chemistry and pack configuration. |
| Integrated cell balancing | Internal 400 Ω FET bypass path per cell (VC1–VC10) - enables passive balancing up to 10 mA per cell using external resistor. |
| Dual LDO power rails | On-chip 5 V and 3.3 V regulators - powers host controller, ADC, or external sensors directly from battery pack voltage. |
| Low-impedance current sensing | Supports 1-mΩ sense resistor with ±3 mV input offset - enables accurate discharge current measurement down to ~10 A full-scale. |
Applications
| Cordless Power Tools | Uninterruptible Power Supply (UPS) |
|---|---|
Use Scenario: High-current 10S Li-ion battery pack in brushless drill/driver requiring fast overcurrent cutoff and cell-level voltage monitoring. IC Role / Device Role / Timing Role: Primary battery protector and analog front end - performs real-time cell voltage sampling, discharge current amplification, and autonomous FET shutdown within 900 µs of short-circuit detection. Use Value: Prevents thermal runaway during stall events by triggering DSG FET turn-off at 60–135 mV across 1-mΩ sense resistor, with <1 ms response time. |
Use Scenario: 8S–10S backup battery system in industrial UPS where runtime extension and safe deep-discharge prevention are critical. IC Role / Device Role / Timing Role: Stand-alone protector with programmable undervoltage lockout - monitors individual cell voltages and disables discharge when any cell drops below 1.4–2.9 V threshold. Use Value: Extends usable capacity by avoiding premature pack shutdown; UV hysteresis (0.2–1.2 V) prevents oscillation near cutoff voltage. |
| Power Assisted Bicycle/Scooter | Medical Equipment |
Use Scenario: 36 V (10S) e-bike battery with integrated cell balancing to maintain pack health over 500+ charge cycles. IC Role / Device Role / Timing Role: Analog front end with host-controlled balancing - measures cell voltages via VOUT and activates VCx bypass paths under MCU command to equalize voltage drift. Use Value: Enables active balancing using internal 400 Ω FETs and external resistors - achieves ≤5 mV inter-cell variance after 30 minutes of balancing at 10 mA. |
Use Scenario: Portable defibrillator or infusion pump with strict safety certification requirements for battery overvoltage and thermal fault response. IC Role / Device Role / Timing Role: Safety-critical protector with fixed overtemperature shutdown - uses TOUT/TIN to bias NTC and triggers CHG/DSG disable at 150°C with 50–150 mV hysteresis. Use Value: Meets IEC 62368-1 thermal safety requirements via hardware-enforced shutdown - no software dependency for critical fault response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protector and analog front end applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ76PL536AIPAPT | 6–16 cell support; integrated 16-bit ADC; no dual LDOs; SPI interface only | Requires external regulators; better suited for high-precision fuel gauging than pure protection | Select when higher-resolution cell voltage measurement (±1 mV) and SPI host integration are prioritized over embedded LDOs. |
| BD99954GWZ-E2 | 4–14 cell support; built-in Coulomb counter; 3.3 V LDO only; no I²C | Lacks 5 V regulator and standalone protection mode; requires host for all recovery actions | Select when integrated coulomb counting and compact 5 mm × 5 mm QFN package outweigh need for autonomous operation. |
Compared with BQ77PL900DLR, BQ76PL536AIPAPT offers superior measurement resolution but demands external power regulation and lacks dual-LDO convenience, while BD99954GWZ-E2 integrates fuel gauging but removes stand-alone safety autonomy - making BQ77PL900DLR optimal for cost-sensitive, self-contained 5–10S protection with minimal external components.
Availability
BQ77PL900DLR is available at Aetrix Electronics and suitable for cordless power tools, uninterruptible power supply (UPS) systems, and medical equipment requiring stable component supply, long-lifecycle support, and automotive-grade reliability validation.
Supply support for BQ77PL900DLR 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 ICs.
The BQ77PL900DLR belongs to TI's bq™ battery monitor and protector product line, designed specifically for high-voltage multi-cell Li-ion packs in industrial, medical, and portable power applications requiring both autonomous safety and host-controllable telemetry.
FAQ
What protection functions does the BQ77PL900DLR provide in stand-alone mode?
The BQ77PL900DLR provides autonomous overvoltage, undervoltage, overcurrent in discharge, and short-circuit in discharge protection in stand-alone mode - all configured via internal EEPROM. When thresholds are exceeded, it independently disables CHG and/or DSG FETs without host intervention. Fixed overtemperature protection also triggers at 150°C using the TIN/TOUT interface. The BQ77PL900DLR requires no external components to execute these safety actions.
How does the BQ77PL900DLR support host-controlled battery management?
The BQ77PL900DLR supports host control via its I²C-compatible serial interface (SCLK/SDATA), allowing a microcontroller to read real-time cell voltages through VOUT, measure charge/discharge current via IOUT, configure protection thresholds, and initiate cell balancing on specific VC pins. Host-controlled recovery from protection events - such as clearing UV or OV flags - is enabled through register writes, giving full firmware-level oversight of the BQ77PL900DLR's behavior.
What is the maximum number of series cells supported by the BQ77PL900DLR?
The BQ77PL900DLR supports 5 to 10 series-connected lithium-ion or lithium-polymer cells, as confirmed by its 11 VC pins (VC1–VC11) - where VC1–VC10 serve as cell voltage inputs and VC11 acts as the stack ground reference. This architecture enables direct monitoring of each cell in a 10S configuration, with full protection and balancing capability across the entire range without reconfiguration.
Can the BQ77PL900DLR operate with a 1-mΩ current sense resistor?
Yes, the BQ77PL900DLR is explicitly rated for operation with a 1-mΩ sense resistor, as stated in its datasheet features and electrical characteristics. Its current-sense amplifier delivers ±3 mV input offset voltage and supports OCD detection thresholds from 10 mV to 85 mV - enabling accurate current measurement up to ~85 A full-scale (85 mV / 1 mΩ) with minimal power loss and thermal impact in high-current applications like power tools.
Does the BQ77PL900DLR include integrated voltage regulators?
Yes, the BQ77PL900DLR integrates two independent LDO regulators: a 5-V/25-mA output (VREG1) and a 3.3-V/25-mA output (VREG2). These regulators are powered directly from the battery pack (PACK or BAT pins) and eliminate the need for external regulators to power host microcontrollers, ADCs, or supporting circuitry - simplifying system design and reducing bill-of-materials cost.
BQ77PL900DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 5 ~ 10
- Fault Protection:
- Over Current, Over/Under Voltage, Short Circuit
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 100°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
BQ77PL900DLR FAQ
1.How can I place an order for BQ77PL900DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ77PL900DLR 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 BQ77PL900DLR reliable?
The price and inventory of BQ77PL900DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ77PL900DLR is usually 5 days.
3.What payment methods are accepted for BQ77PL900DLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ77PL900DLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ77PL900DLR?
BQ77PL900DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ77PL900DLR 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 BQ77PL900DLR?
For technical support, including BQ77PL900DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ77PL900DLR requirements.
6.How does Aetrix verify that BQ77PL900DLR is sourced from the original manufacturer or authorized distributors?
All BQ77PL900DLR 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 BQ77PL900DLR meets industry standards.
7.What is the process for return or replacement of BQ77PL900DLR?
All BQ77PL900DLR units undergo pre-shipment inspection (PSI). If there is an issue with BQ77PL900DLR, 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 BQ77PL900DLR part is unused and in its original packaging.
Return procedure for BQ77PL900DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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