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Texas Instruments BQ296217DSGR
- Part No.:
- BQ296217DSGR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ296217DSGR.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,833
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Product details
Overview
BQ296217DSGR from Texas Instruments is a high-accuracy, low-power overvoltage protector IC for 2–4 series Li-ion battery packs, featuring factory-programmed 4.55V OVP threshold, 6.5s fixed delay timer, ±10mV OVP accuracy, 3.3V regulated output (2mA max), and 2.8V undervoltage self-disable threshold - used to safeguard notebook PC and medical battery packs against cell overvoltage events.
For engineers reviewing the BQ296217DSGR datasheet, BQ296217DSGR pinout, BQ296217DSGR application, or BQ296217DSGR equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, regulator stability specs, and validated alternative options for battery protection system design.
Technical Context
The BQ296217DSGR independently monitors each cell voltage in 2–4 series stacks using precision analog comparators referenced to a factory-trimmed 4.55V overvoltage threshold with 300mV hysteresis. Upon detection, it initiates a fixed 6.5s internal delay before asserting the active-high OUT signal to trigger external FET-based fuse blow circuits.
Its integrated 3.3V regulated supply delivers up to 2mA with ±30mV load regulation (0–2mA), self-disables when any cell drops below 2.8V (with 6s delay and 300mV hysteresis), and draws only 1.2µA quiescent current when disabled - enabling always-on RTC support without battery drain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.55V ±10mV at 25°C - enables precise cell voltage clamping before thermal runaway risk escalates |
| OVP Delay Timer | 6.5s fixed (±20%) - provides deterministic fault response window for fuse activation without nuisance tripping |
| Regulated Output | 3.3V ±30mV (0–2mA load) - powers RTC or supervisor ICs with stable bias independent of pack voltage sag |
| Supply Current (REG on) | 4–8µA (–40°C to +110°C) - ensures multi-year operation in battery-backed systems without measurable capacity loss |
| Input Leakage per Cell | <100nA - prevents cell imbalance drift during long-term storage or standby |
| UV Self-Disable Threshold | 2.8V ±50mV - halts REG output before deep discharge damages Li-ion cells |
| Operating Temp Range | –40°C to +110°C - supports automotive cabin and industrial UPS environments |
Pinout & Package
8-pin WSON package (2.00mm × 2.00mm, 0.5mm pitch), thermally enhanced with exposed pad connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power input | Unregulated supply input (3–20V); connects to top of battery stack; requires RC filter for noise immunity |
| VSS | Ground reference | IC ground and negative terminal of lowest cell; must be connected first during assembly to prevent REG damage |
| V1–V4 | Cell voltage sense inputs | Differential inputs monitoring (V1–VSS), (V2–V1), (V3–V2), (V4–V3); support 2–4 series configurations via pin shorting |
| OUT | Fault signal output | CMOS active-high output; drives NMOS gate to short fuse to ground upon OVP detection after 6.5s delay |
| REG | Regulated supply output | 3.3V/2mA output; requires 0.47µF ceramic capacitor to VSS; self-disables if any cell <2.8V for 6s |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP | 4.55V threshold with ±10mV accuracy eliminates external resistor network and calibration overhead |
| Fixed 6.5s OVP delay | Deterministic timing avoids software dependency and ensures consistent fuse-blow behavior across temperature |
| 3.3V regulated output | Delivers 2mA with ±30mV regulation - sufficient for RTC, microcontroller reset supervisors, or low-power logic |
| Self-disable on undervoltage | Turns off REG when any cell falls below 2.8V (6s delay, 300mV hysteresis) - prevents deep discharge damage |
| Ultra-low leakage | <100nA per sense input - maintains cell voltage balance during multi-year storage without active monitoring |
Applications
| Notebook PC Battery Packs | Medical Portable Devices |
|---|---|
Use Scenario: Protecting 3-series Li-ion packs in ultrabooks during fast charging where cell voltage imbalance may trigger overvoltage. IC Role / Device Role / Timing Role: Second-level hardware OVP monitor that asserts active-high OUT after 6.5s delay to blow fuse before thermal runaway. Use Value: Prevents fire hazard by enforcing hard 4.55V clamp with ±10mV accuracy - tighter than typical charger IC tolerances. |
Use Scenario: Ensuring fail-safe power retention in battery-backed ECG monitors requiring continuous RTC and memory backup. IC Role / Device Role / Timing Role: Provides 3.3V/2mA regulated supply to RTC while self-disabling if any cell drops below 2.8V. Use Value: Extends usable battery life by avoiding deep discharge - preserves >95% cell capacity after 2-year shelf life. |
| UPS Battery Backup Systems | Industrial Handheld Scanners |
Use Scenario: Monitoring 4-series Li-ion strings in uninterruptible power supplies where overvoltage can occur during grid-swing charging. IC Role / Device Role / Timing Role: Independently senses all four cell voltages and triggers fuse blow only if ≥1 exceeds 4.55V for full 6.5s. Use Value: Eliminates false trips from transient spikes - 300mV hysteresis ensures recovery only after safe 4.25V margin. |
Use Scenario: Enabling always-on wake-on-scan functionality in ruggedized barcode scanners powered by 2-series Li-ion packs. IC Role / Device Role / Timing Role: Supplies 3.3V to low-power MCU sleep circuitry while drawing only 1.2µA when REG is disabled. Use Value: Achieves >5-year battery life in standby mode - critical for maintenance-free field deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ296223DSGR | Same 4.50V OVP threshold, identical 6.5s delay and 3.3V REG output, but 2.5V UV disable instead of 2.8V | Suitable for packs where deeper discharge is acceptable before REG shutdown | Select when system-level undervoltage cutoff is set lower than 2.8V and compatibility with existing 2.5V UV logic is required |
| BQ296231DSGR | 4.60V OVP threshold (50mV higher), same 6.5s delay and 3.3V REG, 2.5V UV disable | Allows higher charge termination voltage - useful with newer high-voltage Li-ion chemistries | Choose for next-gen NMC or silicon-anode cells rated to 4.6V/cell; verify thermal margin at elevated OVP trip point |
Compared with BQ296217DSGR, BQ296223DSGR offers identical timing and regulation but relaxes undervoltage protection, while BQ296231DSGR raises OVP tolerance for advanced chemistries - both require validation of cell voltage distribution and thermal derating in final layout.
Availability
BQ296217DSGR is available at Aetrix Electronics and suitable for notebook PC battery management, medical portable device safety systems, and UPS battery backup applications requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for BQ296217DSGR 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 safety ICs and high-reliability power solutions.
The BQ296xxx product line is designed specifically for second-level hardware overvoltage protection in multi-cell Li-ion battery packs - prioritizing accuracy, ultra-low power, and autonomous fault response without host controller intervention.
FAQ
What is the exact overvoltage protection threshold and accuracy of the BQ296217DSGR?
The BQ296217DSGR has a factory-programmed overvoltage protection threshold of 4.55V with ±10mV accuracy at 25°C and ±54mV accuracy across –40°C to +110°C. This tight tolerance ensures reliable cell voltage clamping before thermal instability begins, making it suitable for high-safety applications like medical devices and notebooks where precise voltage control is critical.
How does the BQ296217DSGR regulate its 3.3V output and what is its load capability?
The BQ296217DSGR delivers a regulated 3.3V output capable of supplying up to 2mA with ±30mV load regulation (0–2mA) and ±15mV line regulation (VDD = 4–15V). It requires a 0.47µF ceramic capacitor on the REG pin to VSS for stability and includes short-circuit current limiting (4mA typical) to protect against downstream faults.
What is the purpose and behavior of the undervoltage self-disable function in the BQ296217DSGR?
The BQ296217DSGR disables its REG output when any monitored cell voltage falls below 2.8V for 6 seconds - preventing further discharge that could permanently damage Li-ion cells. Recovery occurs only after all cells exceed 3.1V (2.8V + 300mV hysteresis), ensuring safe re-enabling of backup circuits like RTCs without risking cell reversal.
Does the BQ296217DSGR support 2-cell, 3-cell, and 4-cell battery configurations?
Yes, the BQ296217DSGR supports 2-, 3-, and 4-series Li-ion configurations via its V1–V4 sense inputs. Unused inputs (e.g., V4 in a 3-cell pack) are shorted to the adjacent lower pin (V3), and the device automatically ignores unconnected differential pairs - enabling flexible reuse across multiple pack designs without firmware changes.
What is the recommended PCB layout practice for the BQ296217DSGR to ensure reliability?
TI specifies that VSS must be connected first during cell attachment or PCB test to avoid REG pin damage. Layout requires RC filters (1kΩ + 0.1µF) on each Vx pin placed adjacent to the IC, 0.47µF ceramic capacitor within 2mm of REG–VSS, and the exposed thermal pad soldered directly to a VSS copper pour - all critical to maintain ±10mV OVP accuracy and prevent latch-up under ESD stress.
BQ296217DSGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 2 ~ 4
- Fault Protection:
- Over Voltage
- Interface:
- -
- Operating Temperature:
- -40°C ~ 110°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (2x2)
BQ296217DSGR FAQ
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Please submit a Request for Quotation (RFQ) for BQ296217DSGR 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 BQ296217DSGR reliable?
The price and inventory of BQ296217DSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ296217DSGR is usually 5 days.
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Once your BQ296217DSGR 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 BQ296217DSGR?
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6.How does Aetrix verify that BQ296217DSGR is sourced from the original manufacturer or authorized distributors?
All BQ296217DSGR 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 BQ296217DSGR meets industry standards.
7.What is the process for return or replacement of BQ296217DSGR?
All BQ296217DSGR units undergo pre-shipment inspection (PSI). If there is an issue with BQ296217DSGR, 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 BQ296217DSGR part is unused and in its original packaging.
Return procedure for BQ296217DSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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