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Texas Instruments BQ7721606PWR
- Part No.:
- BQ7721606PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7721606PWR.pdf
- Description:
- VOLTAGE AND TEMPERATURE PROTECTI
- Quantity:
- Payment:
- Shipping:
Inventory:1,881
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Product details
Overview
BQ7721606PWR from Texas Instruments is a fixed-threshold, 16-cell Li-ion battery voltage and temperature protection IC with integrated delay timers. It provides independent overvoltage (4.275 V ±20 mV), undervoltage (2.5 V ±50 mV), open-wire, overtemperature (75°C), and undertemperature (disabled) protection for 3–16 series cell packs. It drives active-high COUT/DOUT outputs to control external FETs or fuses in handheld power tools and e-bike battery management systems.
For engineers reviewing the BQ7721606PWR datasheet, BQ7721606PWR pinout, BQ7721606PWR application, or BQ7721606PWR equivalent, this page delivers verified functional specifications, confirmed TSSOP-24 pin mapping, real-world use cases in cordless tools and light EVs, and two validated alternative parts with documented threshold and timing differences.
Technical Context
The BQ7721606PWR implements independent per-cell voltage monitoring using precision analog comparators with ±20 mV accuracy across 0°C–60°C, and fixed internal delay timers (1 s for OVP/UVP, 4 s for OT). Its TS pin interfaces ratiometrically with an external NTC thermistor via a factory-trimmed 20 kΩ internal pullup to detect overtemperature at 75°C.
It features dual fault outputs: COUT activates on overvoltage or open-wire faults; DOUT activates on undervoltage or open-wire faults; both activate simultaneously on overtemperature. Output drive is active-high with 6 V capability and 4.5 mA source current, supporting direct interface to gate drivers without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.275 V ±20 mV @ 0°C–60°C - sets precise upper cell voltage limit before triggering COUT |
| UVP Threshold | 2.5 V ±50 mV @ –40°C–110°C - defines minimum cell voltage before triggering DOUT |
| OVP/UVP Delay | 1 s - fixed internal timer prevents false trips from transient spikes during normal operation |
| OT Threshold | 75°C - fixed overtemperature trip point detected via NTC on TS pin with ±5°C accuracy |
| Supply Current | ≈3.5 µA (no fault) - enables ultra-low-power always-on monitoring in battery-backed systems |
| Output Drive | Active-high COUT/DOUT, 6 V capable, 4.5 mA source - directly drives gate of high-side FET or logic input |
| Open-Wire Detect | Disabled - eliminates false triggers in applications where cell interconnect integrity is externally managed |
Pinout & Package
Package: 24-pin TSSOP (PW), body size 4.40 mm × 7.80 mm, 0.65 mm lead pitch, leaded, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15, 16 | NC | No internal connection; must be left floating or tied to ground per layout best practice |
| 2 | VDD | Main unregulated supply input (5–75 V); powers internal regulator and sensing circuitry |
| 3–20 | V16–V1 | Cell voltage sense inputs for 16-series stack; V1 connects to lowest cell anode, V16 to top cell cathode |
| 21 | VSS | IC ground reference and connection to negative terminal of lowest cell (V1–) |
| 22 | COUT | Active-high fault output for overvoltage/open-wire/overtemperature; drives to 6 V, 4.5 mA source |
| 23 | DOUT | Active-high fault output for undervoltage/open-wire/overtemperature; identical drive specs as COUT |
| 24 | TS | NTC thermistor input; internally pulled up to VDD via 20 kΩ resistor for ratiometric temperature measurement |
Key Features
| Feature | Design Value |
|---|---|
| Fixed OVP/UVP thresholds | Factory-programmed 4.275 V / 2.5 V eliminates external resistor networks and calibration overhead |
| Active-high 6 V outputs | COUT/DOUT drive to 6 V with 4.5 mA source current enables direct interface to common gate drivers |
| Low quiescent current | 3.5 µA typical supply current extends battery shelf life and reduces self-discharge in standby |
| Customer Test Mode (CTM) | Reduces fault delay to 50 ms for rapid production-line validation without modifying hardware |
| Random cell connection support | Allows flexible PCB layout and field servicing by accepting cell connections in any order without damage |
Applications
| Handheld Power Tools | Cordless Vacuum Cleaners |
|---|---|
Use Scenario: 12–16 cell Li-ion packs powering brushless motors in drills, saws, and impact drivers under high-current, intermittent load. IC Role / Device Role / Timing Role: Monitors individual cell voltages and pack temperature to prevent overcharge, deep discharge, and thermal runaway during aggressive duty cycles. Use Value: Prevents irreversible cell damage and fire risk while enabling full utilization of pack capacity through accurate ±20 mV OVP/UVP detection. |
Use Scenario: 10–14 cell battery packs supplying variable-speed suction motors and digital control boards in portable vacuum systems. IC Role / Device Role / Timing Role: Provides fast-response overvoltage and open-wire detection to safeguard against cell imbalance during frequent charge/discharge cycles. Use Value: Ensures safe operation across 0–60°C ambient range with 1 s delay, avoiding nuisance shutdowns during motor surge currents. |
| Light Electric Vehicles | UPS Battery Backup |
Use Scenario: 13–16 cell e-bike or e-scooter battery packs subjected to regenerative braking, vibration, and wide temperature swings. IC Role / Device Role / Timing Role: Detects overtemperature at 75°C via NTC on TS pin and triggers dual COUT/DOUT to disable charging/discharging paths. Use Value: Enables reliable thermal protection with ±5°C accuracy and eliminates need for external ADC or microcontroller polling. |
Use Scenario: 8–12 cell backup battery modules in telecom or network infrastructure UPS systems requiring long-term reliability and low self-discharge. IC Role / Device Role / Timing Role: Delivers ultra-low ICC ≈ 3.5 µA monitoring to minimize standby drain while maintaining continuous voltage supervision. Use Value: Extends shelf life and runtime between maintenance cycles without compromising safety margin or detection accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7721605PWR | OVP = 4.225 V, UVP = 2.6 V, UV hysteresis = 0.2 V, open-wire disabled | Better suited for higher-voltage Li-ion chemistries requiring tighter UVP margin and reduced UV hysteresis | Select when system requires 2.6 V undervoltage cutoff and enhanced noise immunity on UV detection |
| BQ7721607PWR | OVP = 4.25 V, UVP = 2.5 V, OT = 83°C, UT = –30°C, open-wire enabled | Supports wider temperature range and adds undertemperature protection for cold-climate deployments | Choose when operating below 0°C and needing both over- and undertemperature response with open-wire diagnostics |
Compared with BQ7721606PWR, BQ7721605PWR offers lower OVP and higher UVP thresholds for conservative voltage margins, while BQ7721607PWR adds undertemperature response and higher OT trip-both retain identical TSSOP-24 packaging and active-high 6 V outputs but differ in factory-programmed thresholds and fault enablement.
Availability
BQ7721606PWR is available at Aetrix Electronics and suitable for handheld power tools, cordless vacuum cleaners, and light electric vehicle battery packs requiring stable component supply, long-term lifecycle support, and TI-qualified automotive-grade reliability.
Supply support for BQ7721606PWR 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 is designed specifically for cost-sensitive, high-volume Li-ion battery protection in consumer and industrial portable equipment-emphasizing fixed-function reliability, minimal external components, and production-test efficiency.
FAQ
What is the overvoltage protection threshold of the BQ7721606PWR?
The BQ7721606PWR has a factory-programmed overvoltage protection (OVP) threshold of 4.275 V with ±20 mV accuracy across 0°C to 60°C. This value is trimmed during manufacturing and cannot be adjusted externally. The OVP hysteresis is fixed at 0.2 V, meaning recovery occurs at 4.075 V. This specification ensures consistent cell balancing and prevents overcharge in multi-cell Li-ion packs used in power tools and e-bikes.
Does the BQ7721606PWR support undertemperature protection?
No, the BQ7721606PWR does not support undertemperature (UT) protection. According to the device comparison table, UT is disabled for this variant. Only overtemperature (OT) protection at 75°C is enabled via the TS pin and external NTC thermistor. If undertemperature response is required-for example, for cold-weather e-bike operation-the BQ7721607PWR or BQ7721613PWR should be selected instead.
How does the Customer Test Mode (CTM) function in the BQ7721606PWR?
The BQ7721606PWR enters Customer Test Mode when VDD exceeds V16 by at least 12 V, reducing all fault delay times to 50 ms. This allows rapid validation of protection functionality during battery pack assembly without waiting for full 1 s or 4 s delays. CTM exits automatically when the VDD–V16 differential drops below 10 V. No configuration pins or commands are needed-mode entry is purely voltage-based and fully supported in production test environments.
What is the maximum number of cells the BQ7721606PWR can monitor?
The BQ7721606PWR supports up to 16-series Li-ion cells, with dedicated sense inputs V1 through V16. It monitors each cell's voltage independently for overvoltage, undervoltage, and open-wire conditions. The device is rated for total stack voltages up to 75 V (VDD max), making it suitable for configurations ranging from 3-cell (e.g., 10.8 V) to 16-cell (e.g., 57.6 V nominal) battery packs used in cordless tools and light EVs.
Can the BQ7721606PWR outputs drive external MOSFET gates directly?
Yes, the BQ7721606PWR's COUT and DOUT pins are configured as active-high outputs capable of sourcing 4.5 mA at 6 V, allowing direct drive of common N-channel high-side gate drivers or logic-level FETs without external level shifters. When no fault is present, outputs remain low (0 V); during fault, they rise to 6 V. For low-side switching, external pull-down resistors may be added-but the native drive strength and voltage compliance meet standard gate-drive requirements for discrete protection circuits.
BQ7721606PWR 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
BQ7721606PWR FAQ
1.How can I place an order for BQ7721606PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7721606PWR 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 BQ7721606PWR reliable?
The price and inventory of BQ7721606PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7721606PWR is usually 5 days.
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BQ7721606PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7721606PWR 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 BQ7721606PWR?
For technical support, including BQ7721606PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7721606PWR requirements.
6.How does Aetrix verify that BQ7721606PWR is sourced from the original manufacturer or authorized distributors?
All BQ7721606PWR 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 BQ7721606PWR meets industry standards.
7.What is the process for return or replacement of BQ7721606PWR?
All BQ7721606PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7721606PWR, 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 BQ7721606PWR part is unused and in its original packaging.
Return procedure for BQ7721606PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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