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Texas Instruments BQ2000SN-B5G4
- Part No.:
- BQ2000SN-B5G4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
BQ2000SN-B5G4.pdf
- Description:
- IC BAT CHG MULT-CHEM 1-4CL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,880
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Product details
Overview
BQ2000SN-B5G4 from Texas Instruments is a programmable multi-chemistry fast-charge management IC for NiCd, NiMH, and Li-Ion battery packs. It performs safe fast-charge control via peak voltage detection (3.8 mV PVD), minimum current termination (14% IMAX for Li-Ion), and dual temperature thresholds (VLTF = 0.5 × VCC, VHTF = 0.25 × VCC). It operates with 4–6 V supply, supports 8-pin SOIC packaging, and delivers charge control in portable power tools and medical handheld devices.
For engineers reviewing the BQ2000SN-B5G4 datasheet, BQ2000SN-B5G4 pinout, BQ2000SN-B5G4 application, or BQ2000SN-B5G4 equivalent, key selection criteria include its programmable RC-based timing (MTO up to ~250 min), MOD pin push-pull output for external FET control, SNS input with ±50 mV hysteresis for current sensing, and integrated sleep mode (5 µA ICCS) for low-power standby operation.
Technical Context
The BQ2000SN-B5G4 implements a dual-loop hysteretic switching controller: inner loop regulates charge current via SNS feedback with ±50 mV thresholds and external RSNS, outer loop clamps BAT voltage at 2.00 V per cell (VMCV ±0.75%). Its state machine autonomously selects NiCd/NiMH vs. Li-Ion chemistry based on BAT voltage profile during initial fast-charge phase.
Termination logic differs by chemistry: NiCd/NiMH uses PVD (3.8 mV drop after hold-off period), while Li-Ion switches to constant-voltage regulation followed by minimum-current cutoff (IMIN = 0.14 × IMAX). Temperature supervision uses three thresholds (VTCO = 0.225 × VCC, VLTF = 0.5 × VCC, VHTF = 0.25 × VCC) applied to TS pin with NTC thermistor network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 6 V - defines compatible input supply rails for charger front-end design |
| VMCV Threshold | 2.00 V ±0.75% - sets maximum per-cell voltage limit for Li-Ion and NiMH/NiCd regulation |
| PVD Sensitivity | 3.8 mV ±20% - determines peak-voltage-detection resolution for NiCd/NiMH fast-charge termination |
| IMIN Termination | 14% of IMAX - triggers Li-Ion constant-voltage phase end when charging current drops below this ratio |
| TS Input Thresholds | VLTF = 0.5 × VCC, VHTF = 0.25 × VCC, VTCO = 0.225 × VCC - define thermal fault bands for safe charge suspension |
| Sleep Current | 5 µA - enables ultra-low-power standby during battery removal or idle periods |
| MOD Output Type | Push-pull - directly drives external N-channel MOSFET gate without level-shifting or external driver |
Pinout & Package
Package: 8-pin narrow SOIC (SOIC-NB), body width 3.9 mm, lead pitch 1.27 mm, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SNS | Current-sense input | Detects voltage across external sense resistor (RSNS); ±50 mV hysteresis enables stable hysteretic current regulation |
| VSS | System ground | Reference node for all analog inputs and MOD/LED outputs; must connect to battery negative terminal |
| LED | Charge-status output | Open-drain indicator for charge state (blinking = qualification, on = fast charge, off = suspended/maintenance) |
| BAT | Battery-voltage input | Monitors scaled pack voltage via resistive divider; used for VMCV comparison and PVD sampling |
| TS | Temperature-sense input | Accepts voltage from NTC thermistor network; enables three-point thermal supervision (LTF/HTF/TCO) |
| RC | Timer-program input | Configures MTO, top-off enable/disable, trickle rate, and hold-off period via RC time constant |
| VCC | Supply-voltage input | Power rail requiring 10 µF + 0.1–0.22 µF local decoupling; 4–6 V operating range |
| MOD | Modulation-control output | Push-pull driver for external series FET; high = charge enabled, low = charge inhibited |
Key Features
| Feature | Design Value |
|---|---|
| Multi-chemistry auto-detection | Identifies NiCd/NiMH vs. Li-Ion in real time using BAT voltage trajectory during initial fast-charge phase |
| Programmable termination timing | MTO set via RC network (2 kΩ–250 kΩ resistor + 0.001–1 µF capacitor) enables precise max charge duration tuning |
| Thermal fault recovery | Resumes charging automatically when TS voltage returns within VLTF–VHTF window after overtemperature suspension |
| Trickle-charge pulse control | RMTO resistor value directly sets pulse width (e.g., ~62.5 ms at 150 kΩ) for battery revival and maintenance |
| Integrated hold-off period | Fixed MTO/32 delay disables PVD at fast-charge start to prevent premature termination on new cells |
Applications
| Power Tools | Medical Handheld Devices |
|---|---|
Use Scenario: Cordless drill/driver with interchangeable NiMH and Li-Ion battery packs requiring automatic chemistry recognition and safe fast-charge. IC Role / Device Role / Timing Role: BQ2000SN-B5G4 acts as primary charge controller, managing current regulation, voltage clamping, and dual-chemistry termination without microcontroller intervention. Use Value: Eliminates need for separate chargers per chemistry; ensures full capacity delivery to NiMH via optional top-off and prevents Li-Ion overvoltage via VMCV enforcement. | Use Scenario: Portable ultrasound or glucose monitor using single-cell Li-Ion battery with strict safety and runtime requirements. IC Role / Device Role / Timing Role: BQ2000SN-B5G4 executes CC/CV charge algorithm with IMIN termination and thermal supervision to meet IEC 62368-1 compliance. Use Value: Guarantees charge completion within 2×MTO timeout while maintaining <2.00 V/cell accuracy, reducing risk of swelling or thermal runaway. |
| Industrial Test Equipment | Emergency Lighting Systems |
Use Scenario: Battery-backed multimeter or oscilloscope with long shelf life and infrequent deep discharge cycles. IC Role / Device Role / Timing Role: BQ2000SN-B5G4 provides pre-qualification trickle charge (VBAT < 950 mV), sleep-mode current limiting (5 µA), and automatic reinitiation on power-up. Use Value: Revives deeply discharged packs safely; maintains charge readiness over months of storage without self-discharge-induced failure. | Use Scenario: LED emergency light with NiCd backup battery requiring maintenance charging and temperature-compensated operation in unconditioned environments. IC Role / Device Role / Timing Role: BQ2000SN-B5G4 manages continuous trickle maintenance post-fast-charge and suspends charging if ambient temperature falls below –10°C (VTS > VHTF). Use Value: Extends NiCd service life by preventing overcharge at high temp and undercharge at low temp through adaptive TS thresholding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2002D | Fixed NiCd/NiMH-only support; no Li-Ion algorithm or VMCV-based chemistry detection | Limited to nickel chemistries; lacks Li-Ion CC/CV mode and IMIN termination | Select only for cost-sensitive NiCd/NiMH-only systems where Li-Ion compatibility is unnecessary |
| BQ24075 | Integrated power-path FETs and USB-compatible input regulation; fixed Li-Ion-only operation | Designed for USB-powered portable devices; no NiCd/NiMH support or PVD capability | Choose when system requires seamless source selection (AC adapter/USB) and embedded power-FET integration |
Compared with BQ2000SN-B5G4, BQ2002D offers lower cost but forfeits Li-Ion support and programmability, while BQ24075 provides higher integration for USB-centric designs but eliminates multi-chemistry flexibility and external FET control.
Availability
BQ2000SN-B5G4 is available at Aetrix Electronics and suitable for industrial test equipment, medical handheld devices, cordless power tools, and emergency lighting systems requiring stable component supply and long-term lifecycle support.
Supply support for BQ2000SN-B5G4 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 broad industrial and automotive portfolio coverage.
The bq2000 product line delivers programmable, monolithic fast-charge controllers for multi-chemistry battery packs, targeting applications where autonomous, safe, and flexible charging is required without host MCU involvement.
FAQ
What battery chemistries does the BQ2000SN-B5G4 support?
The BQ2000SN-B5G4 supports NiCd, NiMH, and Li-Ion battery chemistries. It automatically detects chemistry during fast-charge initialization by analyzing the BAT pin voltage profile-reaching VMCV (2.00 V) indicates Li-Ion, while slower voltage rise confirms nickel-based chemistry. This enables single-charger compatibility across mixed-battery fleets without manual configuration or firmware updates.
How does the BQ2000SN-B5G4 terminate fast charge for NiCd/NiMH batteries?
The BQ2000SN-B5G4 terminates NiCd/NiMH fast charge using peak voltage detection (PVD) with 3.8 mV sensitivity, maximum charge time (MTO), maximum temperature (via TS pin), and minimum cell voltage (VLBAT = 950 mV). PVD sampling occurs at MTO/128 intervals during constant-current phase, and an initial hold-off period (MTO/32) prevents false triggering on new cells' voltage overshoot.
Can the BQ2000SN-B5G4 be used with multi-cell battery packs?
Yes, the BQ2000SN-B5G4 supports multi-cell packs via external resistive dividers on BAT and TS pins. For N-series cells, BAT divider scales total pack voltage to ≤2.00 V per cell (e.g., 6.0 V for 3S Li-Ion), and TS network uses NTC thermistor with precision resistors to map temperature to defined voltage thresholds (VLTF, VHTF, VTCO). Layout must maintain low-noise routing to SNS and RC pins.
What is the function of the MOD pin on the BQ2000SN-B5G4?
The MOD pin on the BQ2000SN-B5G4 is a push-pull output that directly controls the gate of an external N-channel MOSFET in the charging path. When MOD is high, charging current flows; when low, current is blocked. Unlike open-drain drivers, MOD requires no pull-up and delivers full VCC swing, simplifying gate drive design and improving efficiency in high-current (>1 A) applications.
Does the BQ2000SN-B5G4 include thermal protection features?
Yes, the BQ2000SN-B5G4 implements three-tier thermal supervision via the TS pin: VLTF (0.5 × VCC) triggers battery conditioning suspension, VHTF (0.25 × VCC) halts charging entirely, and VTCO (0.225 × VCC) forces permanent suspension until reset. These thresholds correspond to user-configurable NTC thermistor networks, enabling precise fault band definition across –20°C to +70°C operating range.
BQ2000SN-B5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1 ~ 4
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current, Timer, Voltage
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 6V
- Interface:
- -
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
BQ2000SN-B5G4 FAQ
1.How can I place an order for BQ2000SN-B5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2000SN-B5G4 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 BQ2000SN-B5G4 reliable?
The price and inventory of BQ2000SN-B5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2000SN-B5G4 is usually 5 days.
3.What payment methods are accepted for BQ2000SN-B5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2000SN-B5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2000SN-B5G4?
BQ2000SN-B5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2000SN-B5G4 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 BQ2000SN-B5G4?
For technical support, including BQ2000SN-B5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2000SN-B5G4 requirements.
6.How does Aetrix verify that BQ2000SN-B5G4 is sourced from the original manufacturer or authorized distributors?
All BQ2000SN-B5G4 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 BQ2000SN-B5G4 meets industry standards.
7.What is the process for return or replacement of BQ2000SN-B5G4?
All BQ2000SN-B5G4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2000SN-B5G4, 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 BQ2000SN-B5G4 part is unused and in its original packaging.
Return procedure for BQ2000SN-B5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ2000SN-B5G4 Tags
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BQ21040DBVR
Texas Instruments
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