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Texas Instruments BQ7721615PWR
- Part No.:
- BQ7721615PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7721615PWR.pdf
- Description:
- VOLTAGE AND TEMPERATURE PROTECTI
- Quantity:
- Payment:
- Shipping:
Inventory:1,935
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Product details
Overview
BQ7721615PWR from Texas Instruments is a fixed-threshold, 16-cell Li-ion battery voltage and temperature protection IC with integrated delay timers. It provides independent per-cell overvoltage (4.23 V ±0.100 V), undervoltage (2.0 V ±0.200 V), open-wire, overtemperature (83°C), and undertemperature (–20°C) detection. Its active-high 6V COUT/DOUT outputs drive external FETs or fuses in cordless power tools and e-bike battery packs.
For engineers reviewing the BQ7721615PWR datasheet, BQ7721615PWR pinout, BQ7721615PWR application, or BQ7721615PWR equivalent, key selection criteria include its 4-second OV/UV delay timing, 100 nA max cell input leakage (open-wire disabled), –40°C to 110°C functional temperature range, TSSOP-24 package compatibility, and factory-programmed OTP configuration for production-line test mode support.
Technical Context
The BQ7721615PWR implements independent analog voltage comparators per cell input (V1–V16) referenced to internal precision bandgap references, with fixed hysteresis and factory-trimmed thresholds. Its internal oscillator drives fixed-delay timers (4 s OV/UV, 4 s OW, 4 s OT) that trigger COUT/DOUT only after sustained fault conditions-preventing false trips from transient noise or load transients.
Temperature sensing uses ratiometric TS pin monitoring with internal 20 kΩ pullup (RNTC), comparing NTC resistance against factory-set ROT_EXT = 1525 Ω (83°C) and RUT_EXT corresponding to –20°C. The device lacks programmability: all thresholds, delays, hysteresis, and output drive types (active-high 6V) are permanently set during manufacturing via OTP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.23 V ±0.100 V - Fixed factory-programmed overvoltage trip level for all 16 cells, enabling precise cell balancing control in 14S–16S e-bike packs. |
| UVP Threshold | 2.0 V ±0.200 V - Undervoltage cutoff preventing deep discharge damage to Li-ion cells during high-current tool operation. |
| OT Threshold | 83°C - Overtemperature trip point matched to common NTC thermistor curves (e.g., 10 kΩ at 25°C), suitable for motor-driven power tools. |
| UT Threshold | –20°C - Undertemperature lockout disabling charge/discharge below freezing, critical for outdoor garden equipment battery safety. |
| Delay Timing | 4 s OV/UV/OW/OT - Fixed internal timer prevents nuisance tripping during brief voltage dips or thermal spikes in handheld tools. |
| Supply Current | ≈1 µA (no fault) - Ultra-low quiescent current extends shelf life and reduces self-discharge in stored battery packs. |
| Cell Input Leakage | <100 nA (OW disabled) - Minimizes parasitic drain on individual cells, preserving state-of-charge during long-term storage. |
Pinout & Package
Package: 24-pin TSSOP (PW), 4.40 mm × 7.80 mm body, 0.65 mm lead pitch, RoHS-compliant, surface-mountable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1–V16 | Cell voltage sense inputs | Independent analog inputs for monitoring each cell's positive terminal relative to VSS; require external RC filters (RIN=1 kΩ, CIN=0.1 µF) for noise immunity. |
| VSS | Reference ground | Common return node tied to negative terminal of lowest cell; serves as reference for all Vx inputs and internal circuitry. |
| VDD | Unregulated supply input | Connects to top of stack voltage (up to 75 V); powers internal regulator and logic; requires RVD/CVD filtering per layout guidelines. |
| COUT | Overvoltage/open-wire/OT/UT fault output | Active-high 6V CMOS output driving external protection FET gate or fuse control; remains inactive unless OV, OW, OT, or UT fault persists ≥4 s. |
| DOUT | Undervoltage/open-wire/OT/UT fault output | Active-high 6V CMOS output; asserts simultaneously with COUT on OW/OT/UT faults; asserts alone on UV faults after 4 s delay. |
| TS | NTC thermistor interface | Analog input for external NTC; internally pulled up to VDD via 20 kΩ resistor; voltage divider with NTC sets OT/UT thresholds. |
| NC (Pins 1, 15, 16) | No-connect terminals | Not electrically bonded; must be left floating or grounded per PCB layout best practices to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed OTP configuration | All parameters (OVP/UVP/OT/UT thresholds, delays, hysteresis, output drive type) are factory-programmed and non-modifiable-ensuring consistent behavior across production batches. |
| Customer Test Mode (CTM) | Reduces fault delay to 50 ms when VDD exceeds V16 by ≥12 V, enabling rapid production-line validation without waiting 4 s per test cycle. |
| Random cell connection support | Accepts cell stack connections in any physical order (V1–V16 not required to match physical cell sequence), simplifying assembly and reducing wiring errors. |
| Open-wire detection | Applies 50 µA pulsed sink to each Vx input every 128 ms; detects broken interconnects between cells before pack energization, preventing unsafe operation. |
| Functional safety capability | Includes oscillator health check and internal voltage monitoring; supports ISO 26262 ASIL-B system-level safety goals when used with external redundancy. |
Applications
| Power Tool Battery Pack | eBike Main Pack Protection |
|---|---|
|
Use Scenario: Cordless drill/driver battery pack with 14–16 series Li-ion cells operating under high-pulse loads (≥30 A). IC Role / Device Role / Timing Role: Primary voltage and temperature supervisor triggering external back-to-back FETs on COUT/DOUT to disconnect load/charge paths within 4 s of sustained OV/UV/OT. Use Value: Prevents cell overcharge during regenerative braking recovery and avoids thermal runaway during continuous high-torque operation. |
Use Scenario: 48 V e-bike battery pack exposed to ambient temperatures from –20°C to 60°C during urban commuting. IC Role / Device Role / Timing Role: Dual-fault monitor asserting both COUT and DOUT on open-wire (cell interconnect failure) or overtemperature (motor controller heat soak). Use Value: Enables fail-safe shutdown before single-point failures propagate across the 16-cell stack, meeting UL 2271 requirements. |
| Garden Equipment Pack | UPS Backup Module |
|
Use Scenario: 40 V string trimmer or hedge trimmer battery subjected to vibration, moisture, and wide temperature swings. IC Role / Device Role / Timing Role: Standalone protector with no microcontroller interface; uses fixed thresholds and CTM for fast factory calibration. Use Value: Eliminates firmware development cost while delivering certified protection for Class II portable appliances. |
Use Scenario: Rack-mounted 12S–16S UPS module requiring long-term float charge stability and low self-discharge. IC Role / Device Role / Timing Role: Low-leakage (≤100 nA/cell) supervisor maintaining pack integrity during months of standby with minimal capacity loss. Use Value: Extends calendar life by preventing micro-cycling due to undetected cell imbalance or slow voltage drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7721616PWR | OVP = 4.18 V, UT = –20°C, same 4 s delays and active-high 6V outputs | Slightly lower overvoltage threshold better suited for LFP-inclusive hybrid chemistries or tighter voltage margins | Select when nominal cell voltage is 3.65 V instead of 3.7 V, or when tighter OV margin improves cycle life. |
| BQ7721614PWR | UVP = 1.85 V, OVP = 3.9 V, OT = 75°C, UT = –20°C, same 4 s delays | Lower undervoltage threshold allows deeper discharge in high-efficiency brushless motor systems | Choose for applications requiring extended runtime at expense of accelerated cell degradation below 2.0 V. |
Compared with BQ7721615PWR, BQ7721616PWR offers a 50 mV lower overvoltage threshold for improved longevity in high-voltage Li-ion stacks, while BQ7721614PWR trades higher overtemperature sensitivity (75°C vs. 83°C) for deeper undervoltage tolerance-making it preferable in thermally constrained UPS enclosures where early OT shutdown would reduce backup availability.
Availability
BQ7721615PWR is available at Aetrix Electronics and suitable for cordless power tools, light electric vehicles, and uninterruptible power supply systems requiring stable component supply, long-lifecycle assurance, and automotive-grade reliability without software dependency.
Supply support for BQ7721615PWR 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 system innovation.
The BQ77216xx product line delivers fixed-function, high-accuracy protection for multi-cell Li-ion packs-designed specifically for cost-sensitive, high-volume applications like power tools and e-mobility where deterministic timing and zero-firmware architecture are mandatory.
FAQ
What is the overvoltage protection threshold of the BQ7721615PWR?
The BQ7721615PWR has a fixed overvoltage protection threshold of 4.23 V ±0.100 V per cell, factory-programmed into its one-time programmable memory. This value is non-adjustable and applies uniformly across all 16 monitored cells (V1–V16). The hysteresis ensures recovery only after voltage drops to 4.13 V, preventing oscillation near the trip point during marginal conditions.
Does the BQ7721615PWR support external temperature sensing?
Yes, the BQ7721615PWR supports external temperature sensing via its TS pin, which interfaces with a standard NTC thermistor. The device uses an internal 20 kΩ pullup resistor (RNTC) to form a voltage divider; the resulting voltage determines whether overtemperature (83°C) or undertemperature (–20°C) conditions are detected based on factory-trimmed resistance thresholds.
Can the BQ7721615PWR be used in 3-series cell configurations?
Yes, the BQ7721615PWR supports battery stacks from 3-series to 16-series cells. For stacks with fewer than 16 cells, unused Vx pins (e.g., V10–V16 in a 9-cell pack) must be connected to VSS or left floating per TI layout guidance. The IC automatically adapts its monitoring window and does not require reconfiguration.
What output drive type does the BQ7721615PWR use for COUT and DOUT?
The BQ7721615PWR uses active-high CMOS outputs for both COUT and DOUT, capable of driving to 6 V regardless of VDD level (up to 75 V). Each output can source up to 4.5 mA and sink up to 3 mA, enabling direct interface with gate drivers or optocouplers without external level-shifting circuitry.
How does the Customer Test Mode (CTM) function in the BQ7721615PWR?
The BQ7721615PWR enters Customer Test Mode when VDD exceeds V16 by at least 12 V, reducing all fault delay timers from 4 s to 50 ms. This enables rapid functional verification during production testing without waiting for full delay periods. CTM exits automatically when the VDD–V16 differential falls below 10 V.
BQ7721615PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 3 ~ 16
- Fault Protection:
- Over Temperature, Over/Under Voltage
- Interface:
- -
- Operating Temperature:
- -40°C ~ 110°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
BQ7721615PWR FAQ
1.How can I place an order for BQ7721615PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7721615PWR 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 BQ7721615PWR reliable?
The price and inventory of BQ7721615PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7721615PWR is usually 5 days.
3.What payment methods are accepted for BQ7721615PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7721615PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7721615PWR?
BQ7721615PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7721615PWR 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 BQ7721615PWR?
For technical support, including BQ7721615PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7721615PWR requirements.
6.How does Aetrix verify that BQ7721615PWR is sourced from the original manufacturer or authorized distributors?
All BQ7721615PWR 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 BQ7721615PWR meets industry standards.
7.What is the process for return or replacement of BQ7721615PWR?
All BQ7721615PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7721615PWR, 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 BQ7721615PWR part is unused and in its original packaging.
Return procedure for BQ7721615PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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