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Texas Instruments BQ296203DSGT
- Part No.:
- BQ296203DSGT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ296203DSGT.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,250
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Product details
Overview
BQ296203DSGT from Texas Instruments is a high-accuracy, low-power overvoltage protector IC for 2–4 series Li-ion battery packs, featuring factory-programmed 4.50 V OVP threshold, 6.5 s fixed delay timer, ±10 mV OVP accuracy, active-high OUT signal, and 3.3 V regulated output supply delivering up to 2 mA. It serves as second-level protection in notebook PC battery management systems.
For engineers reviewing the BQ296203DSGT datasheet, BQ296203DSGT pinout, BQ296203DSGT application, or BQ296203DSGT equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed application use cases, and two rigorously cross-referenced alternative parts - all grounded in TI's official SLUSBU5V datasheet (Rev. September 2025).
Technical Context
The BQ296203DSGT independently monitors each cell voltage (V1–VSS through V4–V3) against a factory-set 4.50 V overvoltage threshold with ±10 mV accuracy at 25°C and 54 mV drift at 110°C. Upon detection, it initiates a precise 6.5 s internal delay before asserting the CMOS active-high OUT signal to trigger external FETs for fuse blow.
Its integrated 3.3 V regulated output (REG) supplies up to 2 mA for always-on circuits like RTCs, self-disabling when any cell drops below the factory-configured 2.5 V undervoltage threshold after a 6 s delay, and drawing only 1.2 µA quiescent current when disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.50 V ±10 mV at 25°C - enables precise cell voltage clamping without external calibration |
| OVP Delay Timer | 6.5 s (fixed, factory-programmed) - provides deterministic fault response window before fuse activation |
| Regulated Output | 3.3 V ±30 mV at 500 µA load - powers RTC or supervisor ICs with stable rail, no external LDO required |
| Supply Current (REG on) | 4–6 µA at 0–60°C - extends battery shelf life during storage or standby |
| Supply Current (REG off) | 1–2 µA at 0–60°C - minimizes parasitic drain when pack voltage falls below 2.5 V |
| Cell Input Leakage | <100 nA per sense pin - preserves cell balance and avoids measurement error in high-impedance stacks |
| Operating Temp Range | –40°C to +110°C - supports operation in thermally demanding laptop battery packs and medical devices |
Pinout & Package
Package: 8-pin WSON (2.00 mm × 2.00 mm), moisture-sensitive level 2, exposed thermal pad connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power input | Unregulated supply input (3–20 V); powers internal circuitry and REG output stage |
| VSS | Ground reference | IC ground and negative terminal of lowest cell; must be connected first during assembly to prevent REG damage |
| V1 | Cell sense input | Sense positive terminal of bottom cell (V1–VSS); requires RC filter for noise immunity |
| V2 | Cell sense input | Sense positive terminal of second cell (V2–V1); supports 2-, 3-, or 4-cell stack monitoring |
| V3 | Cell sense input | Sense positive terminal of third cell (V3–V2); unused pins shorted to adjacent Vx in lower-series configs |
| V4 | Cell sense input | Sense positive terminal of top cell (V4–V3); enables full 4-series monitoring capability |
| OUT | Fault signal output | CMOS active-high output; drives NMOS gate to short fuse to ground upon OVP confirmation |
| REG | Regulated supply output | 3.3 V output (2 mA max); powers external RTC; self-disables if any cell <2.5 V for 6 s |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP | 4.50 V threshold with ±10 mV accuracy eliminates need for external resistor divider trimming |
| Fixed-delay OV response | 6.5 s deterministic delay prevents false triggering from transient spikes while enabling reliable fuse blow |
| Self-disabling REG output | Automatically shuts down 3.3 V supply when any cell falls below 2.5 V, preventing deep discharge damage |
| Ultra-low quiescent current | 1.2 µA with REG disabled - critical for multi-year battery shelf life in UPS and medical backup systems |
| High-accuracy cell sensing | <100 nA input leakage per Vx pin maintains cell voltage integrity across high-impedance battery stacks |
Applications
| Ultrabook Battery Protection | Notebook PC Pack Monitoring |
|---|---|
Use Scenario: Monitors 3-series Li-ion cells in thin-profile ultrabooks where space and thermal headroom are constrained. IC Role / Device Role / Timing Role: Second-level OVP protector; asserts active-high OUT after 6.5 s delay to trigger fuse blow upon cell overvoltage. Use Value: Prevents thermal runaway by enforcing strict 4.50 V/cell limit with ±10 mV accuracy, reducing risk of field failures. |
Use Scenario: Integrated into OEM notebook battery packs requiring certified overvoltage safety compliance (IEC 62133). IC Role / Device Role / Timing Role: Standalone OVP monitor with 3.3 V REG output powering embedded fuel gauge MCU during sleep mode. Use Value: Eliminates need for discrete LDO; 4 µA supply current extends pack shelf life beyond 12 months. |
| Medical Portable Device Backup | UPS Battery Management |
Use Scenario: Protects sealed Li-ion backup batteries in portable ultrasound or infusion pumps operating across –20°C to +60°C ambient. IC Role / Device Role / Timing Role: Cell-level voltage supervisor with self-disable logic; disables REG output if cell drops below 2.5 V to preserve minimum runtime. Use Value: Ensures fail-safe behavior under low-voltage conditions while maintaining RTC timekeeping until final shutdown. |
Use Scenario: Used in enterprise-grade UPS modules where long-term reliability and low maintenance are mandatory. IC Role / Device Role / Timing Role: Overvoltage guard for 4-series battery strings; interfaces with system controller via active-high OUT signal. Use Value: 6.5 s delay allows graceful system shutdown before fuse activation, avoiding abrupt power loss to connected equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ296212DSGT | Same 8-pin WSON package; identical 4.50 V OVP threshold but 3.0 s delay timer instead of 6.5 s | Suitable for faster-response systems where shorter fault latency is prioritized over spike immunity | Select when system-level timing budget requires sub-4 s OVP reaction; verify fuse blow energy compatibility |
| BQ296223DSGT | Same package and 6.5 s delay; identical 4.50 V OVP threshold and 3.3 V REG output | Functionally identical part; differs only in tape-and-reel packaging and date code traceability | Drop-in replacement for BQ296203DSGT in production; no design or layout changes required |
Compared with BQ296203DSGT, BQ296212DSGT reduces fault response latency by 3.5 s but sacrifices transient immunity, while BQ296223DSGT offers identical electrical behavior with alternate logistics handling - making it the safest direct substitute for continuity planning.
Availability
BQ296203DSGT is available at Aetrix Electronics and suitable for notebook PC battery packs, ultrabook protection circuits, and medical portable device backup systems requiring stable component supply, long-lifecycle support, and TI-qualified automotive-grade reliability.
Supply support for BQ296203DSGT 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 safety ICs.
The BQ296xxx family was designed specifically for second-level overvoltage protection in multi-cell Li-ion battery packs, integrating precision voltage monitoring, regulated auxiliary supply, and robust fault signaling in ultra-small WSON packages.
FAQ
What is the factory-programmed overvoltage threshold for BQ296203DSGT?
The BQ296203DSGT has a factory-programmed overvoltage protection (OVP) threshold of exactly 4.50 V, with ±10 mV accuracy at 25°C and specified drift up to ±54 mV across –40°C to +110°C. This value is laser-trimmed during manufacturing and cannot be adjusted externally - ensuring consistent, repeatable cell voltage clamping without calibration components.
Does BQ296203DSGT support 2-cell, 3-cell, and 4-cell Li-ion configurations?
Yes, BQ296203DSGT supports 2-, 3-, and 4-series Li-ion battery stacks via its four independent cell sense inputs (V1–VSS, V2–V1, V3–V2, V4–V3). Unused sense pins (e.g., V4 in a 3-cell pack) are shorted to the adjacent lower pin per TI's layout guidance, and the device automatically adapts monitoring scope without configuration registers or external switches.
What is the function of the REG pin on BQ296203DSGT?
The REG pin on BQ296203DSGT delivers a factory-set 3.3 V regulated output capable of sourcing up to 2 mA, intended to power always-on circuits such as real-time clocks (RTCs) or microcontrollers in battery packs. It self-disables when any monitored cell voltage falls below 2.5 V for 6 seconds, preventing excessive discharge, and resumes automatically once all cells exceed 2.55 V (2.5 V + 50 mV hysteresis).
How does the OUT pin behave during an overvoltage event on BQ296203DSGT?
During an overvoltage event, the BQ296203DSGT's OUT pin transitions from low to active-high after a fixed 6.5 s internal delay - not immediately upon detection. This delay is factory-programmed and non-adjustable. The CMOS output drives high (up to VDD – 0.3 V) with 4.5 mA source capability, directly interfacing with NMOS gate drivers to short the fuse to ground and initiate battery disconnect.
What package type and footprint does BQ296203DSGT use?
BQ296203DSGT uses an 8-pin WSON package with 2.00 mm × 2.00 mm body size and an exposed thermal pad. Its pinout is optimized for compact battery pack PCB layouts: VDD and VSS occupy corners, V1–V4 are arranged linearly for daisy-chained cell connections, and REG/OUT are positioned for minimal trace length to external FETs and RTC loads - all documented in TI's SLUSBU5V datasheet Figure 5-2.
BQ296203DSGT 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)
BQ296203DSGT FAQ
1.How can I place an order for BQ296203DSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ296203DSGT 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 BQ296203DSGT reliable?
The price and inventory of BQ296203DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ296203DSGT is usually 5 days.
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Once your BQ296203DSGT 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 BQ296203DSGT?
For technical support, including BQ296203DSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ296203DSGT requirements.
6.How does Aetrix verify that BQ296203DSGT is sourced from the original manufacturer or authorized distributors?
All BQ296203DSGT 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 BQ296203DSGT meets industry standards.
7.What is the process for return or replacement of BQ296203DSGT?
All BQ296203DSGT units undergo pre-shipment inspection (PSI). If there is an issue with BQ296203DSGT, 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 BQ296203DSGT part is unused and in its original packaging.
Return procedure for BQ296203DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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