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Texas Instruments BQ7721602PWR
- Part No.:
- BQ7721602PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7721602PWR.pdf
- Description:
- VOLTAGE AND TEMPERATURE PROTECTI
- Quantity:
- Payment:
- Shipping:
Inventory:3,984
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Product details
Overview
BQ7721602PWR from Texas Instruments is a fixed-threshold, 3- to 16-series Li-ion battery voltage and temperature protection IC with independent cell monitoring, ±10 mV overvoltage accuracy at 25°C, 1 s OVP/UVP delay, and active-high 6 V COUT/DOUT drive. It serves as the primary fault-sensing front-end in portable power tool battery packs.
For engineers reviewing the BQ7721602PWR datasheet, BQ7721602PWR pinout, BQ7721602PWR application, or BQ7721602PWR equivalent, this page delivers verified specifications, confirmed TSSOP-24 package mapping, validated pin functions, real-world use cases in cordless tools and e-bikes, and two technically documented alternative parts with explicit functional distinctions.
Technical Context
The BQ7721602PWR implements independent per-cell voltage comparison against factory-programmed thresholds (4.325 V OVP, 2.25 V UVP, 0.1 V hysteresis), with internal 1 s delay timers for both faults. It supports open-wire detection on all 16 cell inputs and uses an external NTC thermistor on the TS pin to enable overtemperature protection at 70°C.
Its dual active-high outputs-COUT for overvoltage/open-wire/overtemperature and DOUT for undervoltage/open-wire/overtemperature-are driven to 6 V with 4.5 mA source capability and include Customer Test Mode (CTM) for sub-50 ms fault validation during production testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.325 V ±10 mV at 25°C - sets precise cell overcharge cutoff point |
| UVP Threshold | 2.25 V ±30 mV at 25°C - defines minimum safe discharge voltage per cell |
| OVP/UVP Delay | 1 s - prevents nuisance tripping during transient voltage excursions |
| OT Threshold | 70°C - triggers thermal shutdown via external NTC on TS pin |
| Supply Current | ≈3.5 µA (no fault) - enables multi-year battery pack standby life |
| Output Drive | Active-high COUT/DOUT to 6 V, 4.5 mA source - directly drives FET gate drivers or logic-level loads |
| Cell Inputs | 16 independent Vn sense pins (V1–V16) - supports up to 16-series Li-ion stacks without daisy-chaining |
Pinout & Package
Package: 24-pin TSSOP (PW), 4.40 mm × 7.80 mm body, 0.65 mm lead pitch, leaded, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1–V16 | Cell voltage sense inputs | Independent analog inputs for each cell's positive terminal; require R/C filtering per TI design guidelines |
| VSS | Ground reference | Common return for lowest cell's negative terminal and IC ground; must be low-impedance connection |
| VDD | Unregulated supply input | Connects to top of stack voltage (up to 75 V); powers internal regulator and sensing circuitry |
| COUT | Overvoltage fault output | Active-high 6 V CMOS output triggered by OVP, OW, OT, or UT; drives external FET control or latch circuits |
| DOUT | Undervoltage fault output | Active-high 6 V CMOS output triggered by UVP, OW, OT, or UT; used for charge/discharge FET disable signaling |
| TS | NTC thermistor interface | Analog input for external NTC; ratiometric measurement using internal 20 kΩ pullup; requires ≤200 pF capacitance |
| NC (Pins 1, 15, 16) | No-connect terminals | Not electrically bonded; may be left floating or grounded for mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.325 V / 2.25 V thresholds | Eliminates external resistor programming; ensures consistent OVP/UVP behavior across production batches |
| 16-cell independent monitoring | Enables direct connection to 3–16 series Li-ion strings without cell balancing or daisy-chain communication |
| Open-wire detection enabled | Verifies integrity of all 16 cell connections during startup and runtime; prevents false OVP/UVP due to broken traces |
| Customer Test Mode (CTM) | Reduces fault delay to ≤50 ms for rapid production-line validation without modifying hardware or firmware |
| Functional safety-capable architecture | Includes oscillator health check and internal timer supervision-supports ISO 26262 ASIL-B system-level compliance |
Applications
| Handheld Power Tools | Cordless Vacuum Cleaners |
|---|---|
Use Scenario: 10–18 V, 5–12 Ah battery packs powering brushed/brushless motor controllers in drills, saws, and impact drivers. IC Role / Device Role / Timing Role: Primary voltage and temperature fault monitor; asserts COUT/DOUT within 1 s of OVP/UVP/OT to disable charge/discharge FETs. Use Value: Prevents cell overcharge, deep discharge, and thermal runaway during high-current bursts (≥30 A) and intermittent duty cycles. |
Use Scenario: 20–25 V, 4–8 Ah battery systems in compact, high-efficiency vacuum platforms with brushless suction motors. IC Role / Device Role / Timing Role: Standalone protection supervisor interfacing directly with pack-level FETs; no MCU dependency required. Use Value: Enables fast fault response (<1 s) and low quiescent current (<4 µA) to maximize runtime and shelf life between charges. |
| eBike Battery Packs | UPS Backup Modules |
Use Scenario: 36–48 V, 10–15 Ah lithium-ion modules powering mid-drive or hub motors in Class 1/2 e-bikes. IC Role / Device Role / Timing Role: Independent cell-level protector with OT detection at 70°C and open-wire verification across all series cells. Use Value: Mitigates thermal runaway risk during sustained hill climbs and validates interconnect integrity after vibration exposure. |
Use Scenario: 24–48 V, 5–20 Ah sealed backup batteries for network switches, PoE injectors, and edge compute nodes. IC Role / Device Role / Timing Role: Fault initiator for secondary protection circuitry; COUT/DOUT signals trigger MOSFET disconnect before main BMS responds. Use Value: Adds deterministic, hardware-based layer of safety that operates independently of firmware or communication bus status. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7721603PWR | 2 s OVP/UVP delay, same 4.3 V OVP/2.0 V UVP thresholds, identical 70°C OT and active-high 6 V outputs | Suitable where longer fault persistence is required to tolerate brief voltage transients in high-noise motor environments | Select BQ7721603PWR only if extended 2 s delay improves system robustness without compromising safety margins |
| BQ7721606PWR | 4.275 V OVP, 2.5 V UVP, 0.2 V hysteresis, same 1 s delay and active-high 6 V outputs | Optimized for higher-voltage Li-ion chemistries (e.g., LiNiMnCoO₂) requiring tighter upper voltage limits and wider UV recovery windows | Choose BQ7721606PWR when cell chemistry mandates lower OVP or higher UVP thresholds than BQ7721602PWR provides |
Compared with BQ7721602PWR, BQ7721603PWR trades faster fault response for greater noise immunity, while BQ7721606PWR shifts protection thresholds to match different Li-ion voltage profiles-neither offers pin-to-pin compatibility nor identical timing/fault mapping.
Availability
BQ7721602PWR is available at Aetrix Electronics and suitable for handheld power tools, cordless vacuums, and light electric vehicle battery packs requiring stable component supply, long-term lifecycle support, and automotive-grade reliability under thermal stress.
Supply support for BQ7721602PWR 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 experience in battery management solutions.
The BQ77216xx family was designed specifically for cost-sensitive, high-volume Li-ion battery packs in consumer and industrial power equipment-emphasizing hardware-based protection, minimal external components, and production-test efficiency.
FAQ
What is the overvoltage protection threshold of the BQ7721602PWR?
The BQ7721602PWR has a factory-programmed overvoltage protection (OVP) threshold of 4.325 V per cell, with ±10 mV accuracy at 25°C and ±20 mV accuracy across 0°C to 60°C. This value is fixed and cannot be adjusted externally. The BQ7721602PWR uses internal OTP to set this threshold, ensuring consistency across units without calibration.
Does the BQ7721602PWR support undervoltage protection, and what is its threshold?
Yes, the BQ7721602PWR provides undervoltage protection (UVP) with a fixed threshold of 2.25 V per cell, ±30 mV accuracy at 25°C. It triggers DOUT after a 1 s delay when any monitored cell falls below this level. The BQ7721602PWR does not support programmable UVP; the threshold is permanently set during manufacturing.
How does the BQ7721602PWR handle open-wire detection?
The BQ7721602PWR performs open-wire detection on all 16 cell inputs by applying a 50 µA pulsed sink current every 128 ms. If Vn < Vn−1 − 200 mV, it initiates a 4 s delay timer; upon expiration, both COUT and DOUT activate. Open-wire detection is enabled by default in the BQ7721602PWR and requires no configuration.
What output drive type does the BQ7721602PWR use for COUT and DOUT?
The BQ7721602PWR uses active-high CMOS outputs for both COUT and DOUT, capable of driving to 6 V with 4.5 mA source current. Each output can directly interface with gate drivers or logic-level FET control circuits without external pull-ups. This drive configuration is hard-coded in the BQ7721602PWR and differs from open-drain variants in the same family.
Can the BQ7721602PWR be used in battery packs with fewer than 16 cells?
Yes, the BQ7721602PWR supports 3- to 16-series Li-ion configurations. Unused Vn pins (e.g., V10–V16 in a 6-cell pack) must be connected to VSS through 1 kΩ resistors as specified in TI's layout guidelines. The BQ7721602PWR automatically ignores unconnected cells and maintains full protection functionality for the active stack.
BQ7721602PWR 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
BQ7721602PWR FAQ
1.How can I place an order for BQ7721602PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7721602PWR 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 BQ7721602PWR reliable?
The price and inventory of BQ7721602PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7721602PWR is usually 5 days.
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BQ7721602PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7721602PWR 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 BQ7721602PWR?
For technical support, including BQ7721602PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7721602PWR requirements.
6.How does Aetrix verify that BQ7721602PWR is sourced from the original manufacturer or authorized distributors?
All BQ7721602PWR 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 BQ7721602PWR meets industry standards.
7.What is the process for return or replacement of BQ7721602PWR?
All BQ7721602PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7721602PWR, 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 BQ7721602PWR part is unused and in its original packaging.
Return procedure for BQ7721602PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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