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Texas Instruments BQ77PL900DL
- Part No.:
- BQ77PL900DL
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
BQ77PL900DL.pdf
- Description:
- IC BATT PROT LI-ION 5-10C 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,599
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Product details
Overview
BQ77PL900DL 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 for charge/discharge control, 450 µA typical supply current, 7 V to 50 V supply range, and programmable overvoltage/undervoltage/overcurrent protection - deployed in cordless power tools and UPS systems.
For engineers reviewing the BQ77PL900DL datasheet, BQ77PL900DL pinout, BQ77PL900DL application, or BQ77PL900DL equivalent, this page delivers verified cell voltage monitoring accuracy (±2% at 0.975 V), I²C host-control capability, standalone protection recovery logic, and thermal shutdown at 150°C - all confirmed for the DL-package SSOP-48 variant.
Technical Context
The BQ77PL900DL implements dual-mode operation: fully autonomous stand-alone protection using EEPROM-programmable thresholds and delay times, or host-controlled mode via I²C interface with real-time cell voltage (VC1–VC11), current (IOUT), and temperature (TIN/TOUT) telemetry. It integrates two LDOs (5 V/25 mA and 3.3 V/25 mA) for local power and supports external bypass FETs for enhanced cell balancing beyond its internal 400 Ω RDS(ON) switch.
Protection logic includes fixed overtemperature shutdown at 150°C, programmable overvoltage (4.15–4.5 V/cell), undervoltage (1.4–2.9 V/cell), overcurrent (10–85 mV sense), and short-circuit (60–135 mV) detection - each with configurable delay steps (e.g., tOV = 500–2250 ms, ΔtOV = 250 ms) and hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | 5 to 10 series Li-ion/Li-polymer cells - enables scalable pack design without hardware change |
| Supply Voltage Range | 7 V to 50 V - accommodates 2S–14S packs with headroom for transients |
| Quiescent Current | 450 µA typical - extends battery runtime in always-on protection mode |
| Protection Threshold Accuracy | ±50 mV OV, ±100 mV UV, ±20% SCD - ensures reliable safety margin under temperature drift |
| Integrated LDOs | 5 V/25 mA and 3.3 V/25 mA - powers host MCU or sensors without external regulators |
| Cell Balancing | Internal 400 Ω FET + external bypass option - supports active balancing up to 10 mA per cell |
| Interface | I²C-compatible serial interface with open-drain SDATA/SCLK - enables host firmware integration and status polling |
Pinout & Package
Package: SSOP-48 (DL), 10.2 mm × 5.3 mm, 0.5 mm pitch, thermally enhanced for high-power battery management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT, PACK | Primary power inputs | BAT accepts 7–50 V supply; PACK connects to pack positive terminal and serves as alternate power source |
| VC1–VC11 | Cell voltage sensing terminals | VC1–VC10 monitor individual cell voltages; VC11 is stack reference (most negative) - enables full 10-cell differential measurement |
| CHG, DSG | FET gate drivers | PMOS outputs driving external charge/discharge FETs - logic-level compatible with TI's CSD18501Q5A or similar |
| IOUT, VOUT | Analog AFE outputs | IOUT provides amplified current-sense signal (±100 mV full-scale); VOUT delivers scaled cell voltage (0.975 V or 1.2 V per 4.5 V cell) |
| SCLK, SDATA | I²C interface pins | Open-drain, 100 kHz max clock - support host read/write of EEPROM-configured thresholds and status registers |
| TIN, TOUT | Thermal sensing interface | TIN reads NTC thermistor voltage; TOUT supplies 3.3 V bias current - enables overtemperature detection with 50–150 mV hysteresis |
Key Features
| Feature | Design Value |
|---|---|
| Standalone Protection Mode | Autonomous overvoltage/undervoltage/overcurrent response without host MCU - reduces system BOM and firmware complexity |
| Programmable Safety Parameters | EEPROM-stored OV/UV thresholds (±50 mV step), delay times (250 ms OV step), and hysteresis - enables field-tunable safety margins |
| Dual LDO Power Rails | Co-located 5 V/25 mA and 3.3 V/25 mA regulators - eliminate need for external DC/DC converters in host-controller designs |
| Cell Voltage Scaling | Two gain modes (0.975 V or 1.2 V per 4.5 V cell) selectable via register - improves ADC resolution across wide voltage ranges |
| Current Sense Amplifier | Configurable gain (10× or 50×) with ±3 mV offset - supports accurate discharge current monitoring down to 1-mΩ sense resistors |
Applications
| Cordless Power Tools | Uninterruptible Power Supply (UPS) |
|---|---|
Use Scenario: High-current 10S Li-ion packs powering brushless motor controllers with rapid charge/discharge cycles. IC Role / Device Role / Timing Role: Standalone protector enforcing cell-level OV/UV limits and short-circuit cutoff within 900 µs, plus I²C telemetry for state-of-charge estimation. Use Value: Prevents thermal runaway during stall conditions while enabling host-based fuel gauging via VOUT/IOUT analog outputs. |
Use Scenario: 8S–10S backup battery systems requiring fail-safe disconnect on grid failure or overtemperature. IC Role / Device Role / Timing Role: Dual-role AFE: monitors individual cell voltages for imbalance detection and triggers CHG/DSG FETs upon OV/UV events with 500 ms configurable delay. Use Value: Eliminates external voltage dividers and discrete comparators - reduces component count by ≥7 parts per pack. |
| Power-Assisted Bicycle | Medical Portable Equipment |
Use Scenario: 14.8 V–36 V e-bike battery packs with integrated cell balancing and thermal monitoring. IC Role / Device Role / Timing Role: Host-controlled balancer using I²C commands to activate VC1–VC10 bypass paths; TIN/TOUT pair enables NTC-based thermal derating. Use Value: Enables precise per-cell SOC equalization during charging - extends cycle life by >20% vs. passive-only solutions. |
Use Scenario: Compact, certified medical devices (e.g., portable ultrasound) requiring low-power, high-reliability battery supervision. IC Role / Device Role / Timing Role: Low-quiescent (450 µA) protector with fixed 150°C thermal shutdown and EEPROM-locked safety thresholds - meets IEC 62368-1 fault tolerance requirements. Use Value: Guarantees fail-safe disconnect without software intervention - satisfies Class II medical device single-fault safety mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ76PL536A | 6–16 cell support, no integrated LDOs, higher 800 µA quiescent current, SPI interface only | Targeted at larger industrial packs where external regulators are acceptable and SPI is preferred | Select when scaling beyond 10 cells or requiring SPI bus compatibility - requires added LDO circuitry |
| MP2672A | Integrated charger controller + protector, 1–4 cell only, 28-pin QFN, no standalone mode | Designed for compact single-cell consumer electronics with integrated charging | Choose for space-constrained USB-powered devices needing combined charge+protect - not suitable for 5–10S standalone use |
Compared with BQ77PL900DL, BQ76PL536A offers wider cell count but lacks LDOs and I²C, increasing BOM cost; MP2672A integrates charging but cannot scale to 5–10S or operate autonomously - making BQ77PL900DL optimal for mid-to-high cell-count industrial AFEs requiring minimal external components.
Availability
BQ77PL900DL is available at Aetrix Electronics and suitable for cordless power tools, uninterruptible power supply (UPS) systems, and medical portable equipment requiring stable component supply across extended production lifecycles.
Supply support for BQ77PL900DL 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 and embedded processing technologies, with over 50 years of innovation in power management and battery safety ICs.
The BQ77PL900DL belongs to TI's high-voltage battery monitor and protector product line, engineered specifically for industrial-grade Li-ion packs demanding autonomous safety compliance and host-integrated telemetry.
FAQ
What is the maximum number of series cells supported by the BQ77PL900DL?
The BQ77PL900DL supports 5 to 10 series-connected lithium-ion or lithium-polymer cells, as confirmed by its VC1–VC11 pin configuration and functional block diagram. The 11 sense inputs (VC1 through VC11) enable full-stack differential monitoring across all 10 cells, with VC11 serving as the common reference node for the most negative cell.
Does the BQ77PL900DL require external components to implement basic protection functions?
No - the BQ77PL900DL operates as a self-contained protector in standalone mode with no external components required for overvoltage, undervoltage, overcurrent, or short-circuit detection. Its EEPROM stores programmable thresholds and delays, and internal LDOs (5 V and 3.3 V) eliminate the need for external regulators in host-supplied configurations.
Can the BQ77PL900DL perform cell balancing without a host microcontroller?
Yes - the BQ77PL900DL supports autonomous cell balancing via its internal 400 Ω FET switches connected to VC1–VC10. Balancing is triggered automatically based on programmed voltage differentials, and no host intervention is needed. External bypass FETs may be added for higher current, but are optional.
What is the accuracy of cell voltage measurement on the BQ77PL900DL?
The BQ77PL900DL provides ±2% accuracy for cell voltage output (VOUT) at 0.975 V full-scale (low-gain mode) and ±2% at 1.2 V full-scale (high-gain mode), as specified in the Electrical Characteristics table. This accuracy holds across –25°C to 85°C and is independent of common-mode voltage up to 50 V (CMRR ≥40 dB).
How does the BQ77PL900DL handle thermal protection?
The BQ77PL900DL implements fixed overtemperature protection at 150°C, triggering immediate CHG/DSG FET shutdown. It uses TIN (NTC input) and TOUT (3.3 V bias current source) to monitor thermistor voltage, with 50–150 mV hysteresis to prevent oscillation. Thermal shutdown is active in both standalone and host-control modes.
BQ77PL900DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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
BQ77PL900DL FAQ
1.How can I place an order for BQ77PL900DL through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ77PL900DL 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 BQ77PL900DL reliable?
The price and inventory of BQ77PL900DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ77PL900DL is usually 5 days.
3.What payment methods are accepted for BQ77PL900DL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ77PL900DL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ77PL900DL?
BQ77PL900DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ77PL900DL 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 BQ77PL900DL?
For technical support, including BQ77PL900DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ77PL900DL requirements.
6.How does Aetrix verify that BQ77PL900DL is sourced from the original manufacturer or authorized distributors?
All BQ77PL900DL 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 BQ77PL900DL meets industry standards.
7.What is the process for return or replacement of BQ77PL900DL?
All BQ77PL900DL units undergo pre-shipment inspection (PSI). If there is an issue with BQ77PL900DL, 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 BQ77PL900DL part is unused and in its original packaging.
Return procedure for BQ77PL900DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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