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Texas Instruments BQ29200DRBR
- Part No.:
- BQ29200DRBR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
BQ29200DRBR.pdf
- Description:
- IC BATT PROT LI-ION 2CELL 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:1,650
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Product details
Overview
BQ29200DRBR from Texas Instruments is a secondary overvoltage protection IC for 2-series Li-ion battery packs, providing precision cell voltage monitoring, ±25 mV overvoltage detection accuracy (0°C to 60°C), 4.35 V fixed OVP threshold, and automatic cell imbalance correction with ±30 mV enable/0 mV disable thresholds. It operates across –40°C to +110°C and delivers <3 µA typical supply current in normal mode, enabling robust second-level protection in portable power tools and netbook battery packs.
For engineers reviewing the BQ29200DRBR datasheet, BQ29200DRBR pinout, BQ29200DRBR application, or BQ29200DRBR equivalent, key selection criteria include its 8-pin VSON (DRB) package, external capacitor-controlled delay timing (9 s/µF nominal), internal balancing current up to 15 mA, CB_EN–controlled balancing activation, and compatibility with 2-cell stack topologies requiring high-accuracy dual-cell voltage supervision.
Technical Context
The BQ29200DRBR implements independent voltage comparators for VC1 (bottom cell) and VC2 (top cell), each referenced to a factory-trimmed 4.35 V internal threshold. Overvoltage detection triggers a programmable delay via external capacitor on CD pin before asserting high-level output on OUT.
Cell balancing is initiated when voltage difference between VC2–VC1 and VC1–GND exceeds ±30 mV and ceases at ≤0 mV differential; control is asserted via active-low CB_EN pin, with internal switch resistance RCB1/RCB2 ≈ 2.5–3.0 Ω. The device supports both internal balancing (up to 15 mA) and external FET-based balancing configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.35 V - Factory-programmed fixed overvoltage trip point for both cells, enabling consistent secondary protection without external resistor networks. |
| OVP Accuracy | ±25 mV (0°C to 60°C) - Ensures reliable overcharge detection within tight margin, critical for Li-ion safety compliance. |
| Supply Current | <3 µA typical (VCELL < VPROTECT) - Ultra-low quiescent current extends battery shelf life and minimizes parasitic drain in standby. |
| Delay Scale Factor | 9 s/µF nominal - Enables precise, capacitor-programmable overvoltage response time (e.g., 0.33 µF → ~3 s delay). |
| Cell Balance Enable | CB_EN active-low with 1 V ON / 2.2 V OFF thresholds - Allows system-level control of balancing function based on SOC or thermal state. |
| Operating Temp | –40°C to +110°C - Supports industrial and power tool environments where wide ambient range is required. |
| Package | 8-pin VSON (DRB), 3.0 mm × 3.0 mm - Compact footprint suitable for space-constrained battery pack PCB layouts. |
Pinout & Package
8-pin VSON (DRB) package with exposed thermal pad (PWR PAD) requiring solder connection to PCB ground plane for thermal performance and functional stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC2 | Top cell voltage sense input | Monitors voltage across upper Li-ion cell (PACK+ to VC1); referenced to internal 4.35 V OVP threshold. |
| VC1 | Bottom cell voltage sense input | Monitors voltage across lower Li-ion cell (VC1 to GND); enables independent per-cell overvoltage detection. |
| VC1_CB | Internal cell balance switch node for bottom cell | Connects to internal NMOS switch; used with RCB to set balancing current for VC1–GND path. |
| CB_EN | Active-low cell balance enable control | Pulling low enables automatic imbalance correction; pulling ≥2.2 V disables balancing to conserve energy at low SOC. |
| CD | Capacitor connection for overvoltage delay timer | External capacitor sets delay time (td = CCD × XDELAY); charges to ~5 V LDO rail during overvoltage event. |
| OUT | Open-drain overvoltage alarm output | Drives high (≤9.5 V, IOH = 0) upon OVP timeout; sinks ≥30 µA when low; interfaces directly with fuse drivers or MCU GPIO. |
| VDD | Power supply input | Accepts 4–10 V from battery stack; powers internal circuitry and supplies bias for VCx comparators and balancing switches. |
| GND | Analog and power ground reference | Common return for all sensing, logic, and balancing paths; must be low-impedance connection to pack ground. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed OVP threshold | 4.35 V with ±25 mV accuracy over 0°C–60°C ensures repeatable, calibration-free secondary protection. |
| Programmable overvoltage delay | External CD capacitor sets delay time (e.g., 0.33 µF → 3 s), allowing design flexibility for different charge termination strategies. |
| Auto-balancing with hysteresis | Starts at ±30 mV cell mismatch, stops at ≤0 mV - prevents oscillation and reduces unnecessary balancing cycles. |
| Low-power operation | <3 µA ICC in normal mode extends battery shelf life and avoids measurable self-discharge in storage. |
| Internal balancing capability | Supports up to 15 mA per cell via integrated switches (RCB1/RCB2 ≈ 2.5–3.0 Ω), eliminating need for external FETs in low-current applications. |
Applications
| Power Tools | Netbook Computers |
|---|---|
Use Scenario: Cordless drill/driver battery packs with dual 3.7 V Li-ion cells in series, subject to uneven aging and charging stress. IC Role / Device Role / Timing Role: Secondary overvoltage protector and auto-balancer that monitors individual cell voltages and corrects imbalance before OVP triggers. Use Value: Prevents single-cell overcharge during fast charging or high-temp operation, extending pack cycle life and meeting UL2054/IEC62133 safety requirements. | Use Scenario: Slim-profile notebook battery modules where PCB space limits discrete protection components. IC Role / Device Role / Timing Role: Standalone 2-cell supervisor providing OVP cutoff and passive balancing without MCU intervention. Use Value: Reduces BOM count by integrating precision voltage detection, delay timing, and balancing control into one 3×3 mm IC. |
| Battery Backup Systems | Portable Medical Devices |
Use Scenario: UPS or emergency lighting packs using 2S Li-ion for compact, high-energy-density backup. IC Role / Device Role / Timing Role: Fail-safe secondary protector that asserts OUT signal to disconnect load/fuse when either cell exceeds 4.35 V. Use Value: Adds redundancy to primary protection ICs, ensuring safe shutdown even if main controller fails or firmware locks up. | Use Scenario: Handheld diagnostic instruments requiring long shelf life and guaranteed cell voltage matching during infrequent use. IC Role / Device Role / Timing Role: Low-quiescent supervisor that balances cells during storage to prevent drift-induced capacity loss. Use Value: Maintains ≤5 mV inter-cell variance after 6-month storage, preserving runtime accuracy and avoiding premature low-voltage cutoff. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-cell Li-ion secondary protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29209DRBR | 4.30 V OVP threshold (vs. BQ29200DRBR's 4.35 V); otherwise identical pinout, features, and specs. | Suitable for chemistries or systems requiring tighter overvoltage margin (e.g., NMC with lower max cell voltage). | Select BQ29209DRBR only when 4.30 V OVP is explicitly required; not drop-in for 4.35 V designs. |
| BD14000EFV-C | 4.25 V OVP, no integrated balancing, 6-pin TSOT-23 package, higher ICC (12 µA), no CB_EN control. | Limited to basic OVP-only use cases; requires external balancing circuitry and offers less precision (±50 mV). | Choose only when balancing is handled externally and ultra-low ICC is not required; not functionally equivalent. |
Compared with BQ29200DRBR, BQ29209DRBR provides identical functionality at a lower OVP threshold, while BD14000EFV-C lacks balancing integration and accuracy-making BQ29200DRBR the optimal choice for space-constrained, auto-balancing 2S Li-ion systems demanding ±25 mV OVP precision.
Availability
BQ29200DRBR is available at Aetrix Electronics and suitable for power tools, netbook computers, and battery backup systems requiring stable component supply, long-lifecycle support, and consistent second-source availability for safety-critical Li-ion protection.
Supply support for BQ29200DRBR 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 BQ29200DRBR belongs to TI's bq2920x family of secondary protection ICs, designed specifically for high-accuracy, low-power, 2-series Li-ion battery pack supervision with integrated cell balancing control.
FAQ
What is the exact overvoltage protection threshold for BQ29200DRBR?
The BQ29200DRBR has a factory-programmed fixed overvoltage protection (OVP) threshold of 4.35 V per cell, with ±25 mV accuracy over 0°C to 60°C ambient temperature. This value is trimmed during manufacturing and cannot be adjusted externally. The BQ29200DRBR does not support user-configurable OVP thresholds-only the pin-compatible BQ29209DRBR offers 4.30 V as an alternative.
How does the BQ29200DRBR perform automatic cell balancing?
The BQ29200DRBR initiates automatic cell balancing when the voltage difference between VC2–VC1 and VC1–GND exceeds ±30 mV, and stops when the differential falls to ≤0 mV. Balancing is enabled by pulling CB_EN low, activating internal NMOS switches (RCB1/RCB2 ≈ 2.5–3.0 Ω) to discharge the higher-voltage cell through an external RCB resistor. The BQ29200DRBR supports up to 15 mA internal balancing current and also allows external FET-based configurations for higher currents.
What package type and dimensions does BQ29200DRBR use?
The BQ29200DRBR uses an 8-pin VSON (DRB) package with nominal body size of 3.00 mm × 3.00 mm and 0.5 mm lead pitch. It includes an exposed thermal pad (PWR PAD) that must be soldered to a PCB ground plane for proper thermal dissipation and functional stability. This package is RoHS-compliant and optimized for automated SMT assembly in battery pack modules.
Can BQ29200DRBR be used in 3-series or higher battery configurations?
No, the BQ29200DRBR is strictly designed for 2-series Li-ion battery stacks only. Its internal architecture monitors exactly two voltage nodes: VC1 (bottom cell to GND) and VC2 (top cell to VC1). Attempting to use it in 3S or higher configurations will result in incorrect voltage referencing, missing OVP coverage for intermediate cells, and undefined behavior. For >2S systems, TI recommends the BQ77PL900 or BQ769x2 families instead.
What is the recommended external capacitor value for a 2-second overvoltage delay with BQ29200DRBR?
Using the BQ29200DRBR's nominal delay scale factor of 9 s/µF, a 2-second overvoltage delay requires a CD capacitor of approximately 0.22 µF (2 s ÷ 9 s/µF = 0.222 µF). A standard 0.22 µF X7R ceramic capacitor with ±10% tolerance is recommended. Ensure the capacitor is placed close to the CD pin and rated for ≥10 V to handle transient conditions during OVP events.
BQ29200DRBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 2
- Fault Protection:
- Over Voltage
- Interface:
- -
- Operating Temperature:
- -40°C ~ 110°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SON (3x3)
BQ29200DRBR FAQ
1.How can I place an order for BQ29200DRBR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29200DRBR 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 BQ29200DRBR reliable?
The price and inventory of BQ29200DRBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29200DRBR is usually 5 days.
3.What payment methods are accepted for BQ29200DRBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29200DRBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ29200DRBR?
BQ29200DRBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29200DRBR 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 BQ29200DRBR?
For technical support, including BQ29200DRBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29200DRBR requirements.
6.How does Aetrix verify that BQ29200DRBR is sourced from the original manufacturer or authorized distributors?
All BQ29200DRBR 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 BQ29200DRBR meets industry standards.
7.What is the process for return or replacement of BQ29200DRBR?
All BQ29200DRBR units undergo pre-shipment inspection (PSI). If there is an issue with BQ29200DRBR, 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 BQ29200DRBR part is unused and in its original packaging.
Return procedure for BQ29200DRBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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