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Texas Instruments BQ7721607PWR
- Part No.:
- BQ7721607PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7721607PWR.pdf
- Description:
- VOLTAGE AND TEMPERATURE PROTECTI
- Quantity:
- Payment:
- Shipping:
Inventory:5,322
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Product details
Overview
BQ7721607PWR 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 (4.25 V ±10 mV at 25°C), undervoltage (2.5 V), overtemperature (83°C), and undertemperature (–30°C) detection, plus open-wire fault detection - all in a 24-pin TSSOP package for handheld power tools and e-bike battery packs.
For engineers reviewing the BQ7721607PWR datasheet, BQ7721607PWR pinout, BQ7721607PWR application, or BQ7721607PWR equivalent, this device delivers production-ready, functional-safety-capable cell monitoring with active-high 6V COUT/DOUT outputs, 4s OV/UV delay timing, and <1 µA quiescent current under no-fault conditions - critical for low-power, high-reliability battery management systems.
Technical Context
The BQ7721607PWR implements independent analog voltage comparators per cell input (V1–V16) with precision reference trimming, enabling ±10 mV OVP accuracy at 25°C and ±20 mV across 0°C to 60°C. Its internal oscillator drives fixed delay timers (4 s for OVP/UVP, 4 s for OW/OT) that trigger COUT or DOUT only after timeout - preventing false trips from transient spikes.
Temperature sensing uses ratiometric TS pin monitoring with internal 20 kΩ pullup and external NTC thermistor; OT threshold is factory-set to 83°C and UT to –30°C. Output drive is configured as active-high CMOS with 6V capability on both COUT and DOUT, supporting direct interface to external FET gate drivers or fuse control circuits without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.25 V ±10 mV at 25°C - enables precise high-voltage cutoff before cell degradation in 16S Li-ion stacks. |
| UVP Threshold | 2.5 V - prevents deep discharge damage to cells in cordless power tool applications. |
| OT / UT Thresholds | 83°C / –30°C - factory-trimmed thresholds for thermal runaway prevention and low-temp charge blocking. |
| Delay Timing | 4 s OVP/UVP, 4 s OW/OT - fixed internal timers eliminate external component dependency and reduce BOM count. |
| Quiescent Current | ≈1 µA (VCELL(ALL) < VOV) - extends shelf life and reduces self-discharge in standby battery packs. |
| Output Drive | Active-high CMOS, 6V capable - directly drives external MOSFET gates or logic-level fuses without pull-up resistors. |
| Cell Input Leakage | <100 nA (OW disabled) - minimizes measurement error and preserves cell balance in high-impedance sensing networks. |
Pinout & Package
Package: 24-pin TSSOP (PW), 4.40 mm × 7.80 mm body size, 0.65 mm lead pitch, leaded surface-mount format compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15, 16 | NC | No-connect pins - must be left floating; no internal connection or function. |
| 2 | VDD | Main unregulated supply input (5–75 V); powers internal regulator and sensing circuitry for up to 16-series stacks. |
| 3–20 | V16 to V1 | Independent cell voltage sense inputs - connect sequentially to top (V16) through bottom (V1) of stack; each monitors Vn–Vn−1 differential. |
| 21 | VSS | IC ground and stack negative reference - electrically tied to lowest cell's negative terminal. |
| 22 | COUT | Active-high 6V fault output - asserted on OVP, OW, OT, or UT; drives external protection FETs or fuses directly. |
| 23 | DOUT | Active-high 6V fault output - asserted on UVP, OW, OT, or UT; used for secondary disconnect or system alert signaling. |
| 24 | TS | NTC thermistor interface - ratiometric input with internal 20 kΩ pullup; requires external NTC for temperature monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Per-cell voltage monitoring | 16 independent analog inputs (V1–V16) with ±10 mV OVP accuracy at 25°C - ensures reliable cell-level fault detection without multiplexing. |
| Fixed internal delay timers | Factory-programmed 4 s delays for OVP/UVP/OW/OT - eliminates external RC timing components and improves production consistency. |
| Open-wire detection | Enabled with 50 µA pulsed sink per input - identifies broken interconnects between cells before pack operation begins. |
| Functional safety capability | Includes oscillator health check and ratiometric TS monitoring - supports ISO 26262 ASIL-B readiness in automotive-adjacent applications. |
| Customer Test Mode (CTM) | 50 ms fault detection delay when VDD > V16 + 12 V - accelerates production-line validation without modifying hardware. |
Applications
| Handheld Power Tools | eBike Battery Packs |
|---|---|
|
Use Scenario: Cordless drill/driver battery packs with 12–16 series Li-ion cells operating in variable-load, high-current environments. IC Role / Device Role / Timing Role: Primary voltage and temperature protector - monitors each cell independently and asserts COUT/DOUT to disable charge/discharge paths upon fault. Use Value: Prevents overvoltage-induced thermal runaway during fast charging and undervoltage-induced copper shunting during high-torque motor stalls. |
Use Scenario: 48 V nominal e-bike battery modules requiring robust overtemperature and open-wire detection across 13–14 series cells. IC Role / Device Role / Timing Role: Standalone protection AFE - detects 83°C OT and –30°C UT via NTC, triggers dual-output shutdown to isolate motor and charger interfaces. Use Value: Enables safe regenerative braking and low-temp charging compliance without microcontroller intervention. |
| Cordless Vacuum Cleaners | UPS Battery Backup |
|
Use Scenario: High-power, short-duration vacuum cleaner batteries with aggressive discharge profiles and tight thermal constraints. IC Role / Device Role / Timing Role: Fault supervisor - uses 4 s OVP delay to tolerate brief voltage spikes during brushless motor commutation while rejecting noise. Use Value: Avoids nuisance shutdowns during peak suction loads while maintaining strict 4.25 V per-cell ceiling for cycle life preservation. |
Use Scenario: Rack-mounted UPS systems using 16S Li-ion strings where long-term reliability and zero-maintenance operation are mandatory. IC Role / Device Role / Timing Role: Maintenance-free protector - leverages <1 µA ICC and open-wire detection to ensure pack integrity during multi-year standby. Use Value: Guarantees fail-safe disconnect on cell disconnection or thermal excursion without periodic calibration or firmware updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7721610PWR | Same 24-pin TSSOP package and 4.25 V OVP, but COUT is active-high 6V while DOUT is active-low - differs in output polarity configuration. | Requires external pull-up on DOUT for logic compatibility; better suited for designs needing asymmetric fault signaling. | Select BQ7721610PWR only if active-low DOUT is required for existing gate driver or latch circuit topology. |
| BQ7721613PWR | Identical OVP (4.25 V), UV (2.0 V), OT (83°C), and UT (–30°C), but uses 0.2 V hysteresis vs. 0.1 V - slightly wider recovery window. | Reduces chattering on marginal UVP events in high-noise power tool environments; trades tighter threshold control for stability. | Choose BQ7721613PWR when field reliability under EMI-heavy conditions outweighs need for minimal UV hysteresis. |
Compared with BQ7721607PWR, BQ7721610PWR offers mixed-output polarity for flexible interface design, while BQ7721613PWR provides enhanced noise immunity via doubled UV hysteresis - both retain identical cell count, timing, and thermal thresholds but differ in output behavior and hysteresis tuning.
Availability
BQ7721607PWR is available at Aetrix Electronics and suitable for handheld power tools, e-bike battery packs, cordless vacuum cleaners, and UPS battery backup systems requiring stable component supply, long-lifecycle support, and functional-safety-capable protection ICs.
Supply support for BQ7721607PWR 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 solutions.
The BQ77216xx product line is designed specifically for cost-sensitive, high-volume Li-ion battery protection in consumer and light industrial applications - delivering fixed-function safety without MCU dependency or firmware overhead.
FAQ
What is the overvoltage protection threshold of the BQ7721607PWR?
The BQ7721607PWR has a factory-programmed overvoltage protection (OVP) threshold of 4.25 V per cell, with ±10 mV accuracy at 25°C and ±20 mV accuracy from 0°C to 60°C. This value is permanently stored in one-time-programmable (OTP) memory and cannot be adjusted externally. The BQ7721607PWR uses this fixed threshold to trigger COUT after a 4 s delay when any monitored cell exceeds 4.25 V.
Does the BQ7721607PWR support undertemperature protection?
Yes, the BQ7721607PWR supports undertemperature (UT) protection with a factory-set threshold of –30°C, detected via the TS pin using an external NTC thermistor and internal 20 kΩ pullup resistor. When the thermistor resistance rises above the UT trip point, the device asserts both COUT and DOUT after a 4 s delay. The BQ7721607PWR does not require additional configuration to enable UT - it is active by default.
What output drive type does the BQ7721607PWR use on COUT and DOUT?
The BQ7721607PWR uses active-high CMOS output drive on both COUT and DOUT, capable of sourcing up to 4.5 mA at 6 V. This allows direct connection to gate drivers or logic inputs without external pull-up resistors. Unlike open-drain variants, the BQ7721607PWR's outputs actively drive high during faults and return low when cleared - confirmed by Device Comparison Table entry for BQ7721607PWR showing "Active High, 6V Drive".
Can the BQ7721607PWR monitor fewer than 16 cells?
Yes, the BQ7721607PWR supports 3- to 16-series cell configurations. Unused Vx pins (e.g., V16–V4 for a 3S pack) must be connected to VSS to prevent floating inputs, per TI's layout guidance. The device automatically adapts its monitoring range based on physical connections - no configuration register or strap pins are required. All BQ7721607PWR functionality remains fully operational regardless of actual cell count within the 3–16 range.
What is the purpose of Customer Test Mode (CTM) in the BQ7721607PWR?
Customer Test Mode (CTM) in the BQ7721607PWR reduces fault detection delay from 4 s to 50 ms by applying VDD ≥ V16 + 12 V, enabling rapid production-line validation of protection timing without modifying hardware. CTM is temporary and self-exiting: when VDD drops below the threshold, the device returns to normal 4 s timing. The BQ7721607PWR does not retain CTM state after power cycle - it always boots into normal mode.
BQ7721607PWR 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
BQ7721607PWR FAQ
1.How can I place an order for BQ7721607PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7721607PWR 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 BQ7721607PWR reliable?
The price and inventory of BQ7721607PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7721607PWR is usually 5 days.
3.What payment methods are accepted for BQ7721607PWR?
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4.How is shipping managed for BQ7721607PWR?
BQ7721607PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7721607PWR 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 BQ7721607PWR?
For technical support, including BQ7721607PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7721607PWR requirements.
6.How does Aetrix verify that BQ7721607PWR is sourced from the original manufacturer or authorized distributors?
All BQ7721607PWR 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 BQ7721607PWR meets industry standards.
7.What is the process for return or replacement of BQ7721607PWR?
All BQ7721607PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7721607PWR, 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 BQ7721607PWR part is unused and in its original packaging.
Return procedure for BQ7721607PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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