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Texas Instruments BQ24400PWRG4
- Part No.:
- BQ24400PWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ24400PWRG4.pdf
- Description:
- IC BATT CHG MULTI-CHEM 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,555
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Product details
Overview
BQ24400PWRG4 from Texas Instruments is a programmable monolithic NiCd/NiMH fast-charge management IC in TSSOP-8 package, featuring peak voltage detection (PVD), temperature-based fault monitoring (VTCO/VLTF/VHTF), and user-programmable maximum charge time (MTO) via RC network. It delivers precise current regulation (IMAX = 0.05/RSNS) and supports top-off and pulse-trickle maintenance for multi-cell battery packs in portable medical devices and industrial handhelds.
For engineers reviewing the BQ24400PWRG4 datasheet, BQ24400PWRG4 pinout, BQ24400PWRG4 application, or BQ24400PWRG4 equivalent, key selection considerations include its 2.00 V maximum cell voltage threshold, 5 µA sleep current, 100–200 kHz switching frequency range, open-drain LED status output, and MOD pin push-pull modulation control for external FET gate drive.
Technical Context
The BQ24400PWRG4 implements a hysteretic current-control loop with dual thresholds (VSNSHI = +50 mV, VSNSLO = –50 mV) to regulate charging current via external sense resistor RSNS and MOD pin switching. Its internal ADC samples BAT voltage at MTO/128 rate during fast charge exclusively for PVD detection (3.8 mV delta).
Temperature safety is enforced through three independent comparators monitoring TS pin voltage against VTCO (0.225 × VCC), VLTF (0.5 × VCC), and VHTF (0.25 × VCC); fast-charge termination occurs on PVD, MTO expiry, or VTS < VTCO, while VLTF violation suspends fast charge and initiates trickle conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4–6 V - powers internal circuitry and enables operation within standard 5 V rail systems |
| Max Cell Voltage (VMCV) | 2.00 V ±2.5% - hard clamp preventing overvoltage damage to individual NiCd/NiMH cells |
| PVD Detection Threshold | 3.8 mV ±20% - minimum voltage drop triggering fast-charge termination to avoid overcharge |
| Sleep Current (ICCS) | 5 µA - ultra-low quiescent draw when battery voltage exceeds VSLP (VCC–1 V) |
| Switching Frequency | 100–200 kHz typical - enables compact magnetics and low EMI in high-efficiency charger designs |
| Trickle Pulse Frequency | 1 Hz - periodic conditioning pulses for deeply discharged batteries without thermal stress |
| RC Timer Range (MTO) | RMTO × CMTO × 35,988 minutes - fully programmable timeout for fast charge, top-off, and hold-off periods |
Pinout & Package
Package: TSSOP-8 (PWR suffix), 3.0 mm × 4.4 mm, 0.65 mm pitch, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SNS | Current-sense input | Differential input sensing voltage across external RSNS to regulate IMAX = 0.05/RSNS |
| LED | Charge-status output | Open-drain indicator: 1 Hz flash (qualification), low (fast charge), high-Z (complete/sleep) |
| BAT | Battery-voltage sense input | Resistive divider input monitoring pack voltage for VMCV clamp and PVD sampling |
| VSS | System ground | Reference node for all analog inputs and MOD output; connects to battery negative terminal |
| MOD | Modulation-control output | Push-pull driver controlling external series FET gate to enable/disable charging current flow |
| VCC | Supply-voltage input | Primary power rail requiring 10 µF + 0.1–0.22 µF local decoupling for stable operation |
| TS | Temperature-sense input | Analog input for NTC thermistor network setting VTCO/VLTF/VHTF thresholds relative to VCC |
| RC | Timer-program input | Analog node setting MTO, hold-off period, top-off enable, and trickle pulse width via RMTO/CMTO |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Fast-Charge Termination | Simultaneous enforcement of PVD, MTO expiry, and VTS < VTCO ensures safe, chemistry-specific cutoff |
| Pre-Charge Qualification Logic | Automatically initiates trickle-charge (1 Hz pulses) if BAT < 950 mV, preventing damage to shorted or depleted cells |
| Top-Off Charge Mode | Optional post-fast-charge pulsing at 1/16 IMAX for up to full MTO duration to maximize NiMH capacity |
| Integrated Sleep Mode | Enters 5 µA state when BAT > VSLP (VCC–1 V), eliminating standby power loss in unattended applications |
| Multi-Threshold Temperature Safety | Three independent TS comparators enforce distinct actions per condition: suspend (VLTF), pause (VHTF), or terminate (VTCO) |
Applications
| Portable Medical Devices | Industrial Handheld Terminals |
|---|---|
|
Use Scenario: Rechargeable NiMH battery packs powering blood glucose meters and portable ECG monitors requiring reliable, low-risk charging under variable ambient temperatures. IC Role / Device Role / Timing Role: Primary charge controller managing fast-charge initiation, PVD-based termination, and temperature-fault suspension to prevent thermal runaway in sealed enclosures. Use Value: Ensures compliance with IEC 62368-1 thermal safety by halting charge at VTS < VTCO (0.225 × VCC) and resuming only after VTS > VHTF (0.25 × VCC). |
Use Scenario: Multi-cell NiCd battery systems in warehouse barcode scanners subjected to frequent partial discharge and wide-temperature operation (–20°C to 70°C). IC Role / Device Role / Timing Role: Dual-role supervisor performing pre-qualification (trickle if VBAT < 950 mV) and fast-charge regulation with MTO timeout to prevent overcharge during intermittent use. Use Value: Eliminates need for microcontroller-based charge supervision by embedding complete state-machine logic (Figure 2) and open-drain LED status signaling. |
| Emergency Lighting Systems | Two-Way Radio Chargers |
|
Use Scenario: Standby NiCd battery banks in exit sign luminaires requiring infrequent but fail-safe reconditioning after long idle periods. IC Role / Device Role / Timing Role: Trickle-maintenance enabler sustaining full capacity indefinitely while detecting battery removal/insertion via BAT voltage transitions. Use Value: Maintains >95% rated capacity over 5-year service life using pulse-trickle (1 Hz) with user-adjustable width via RMTO resistor. |
Use Scenario: Rapid-turnaround charging docks for professional-grade two-way radios using 4–6 cell NiMH packs in field-deployed vehicles. IC Role / Device Role / Timing Role: High-frequency (100–200 kHz) switch-mode controller driving external MOSFET to deliver 1 A fast charge with minimal heatsink requirements. Use Value: Achieves <150 mW total dissipation at 1 A output via hysteretic control, enabling convection-cooled PCB layouts in space-constrained docks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NiCd/NiMH charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX713CPA+ | Fixed 1.25 V reference; no programmable MTO; uses external op-amp for current sense | Lacks integrated PVD sampling and top-off mode; requires more external components | Select when cost-sensitive designs prioritize simplicity over programmability and safety granularity |
| BQ2002GN | Single-chip solution with integrated FET driver; no MOD pin; fixed 1.5 V VMCV | Supports only single-cell NiCd; lacks TS-based cold-temperature suspension (VLTF) | Choose for compact single-cell applications where thermal margin is tightly controlled externally |
Compared with MAX713CPA+ and BQ2002GN, the BQ24400PWRG4 provides superior flexibility in multi-cell configuration, finer temperature fault discrimination (three thresholds vs. one), and fully programmable timing-making it optimal for ruggedized, field-serviceable equipment requiring long-term reliability without firmware intervention.
Availability
BQ24400PWRG4 is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld terminals, emergency lighting systems, and two-way radio chargers requiring stable component supply across extended production lifecycles.
Supply support for BQ24400PWRG4 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade performance.
The BQ24400PWRG4 belongs to TI's dedicated battery management IC portfolio designed specifically for safe, autonomous charging of nickel-based chemistries in mission-critical portable and industrial equipment.
FAQ
What is the primary function of the BQ24400PWRG4 in a NiCd/NiMH charging system?
The BQ24400PWRG4 serves as a fully autonomous fast-charge management IC that regulates charging current, enforces multiple termination criteria (peak voltage, temperature, time), and manages pre-charge, top-off, and trickle maintenance states without microcontroller intervention. Its core function is to ensure safe, chemistry-optimized charging of multi-cell NiCd/NiMH battery packs while minimizing external component count.
How does the BQ24400PWRG4 detect and respond to battery temperature faults?
The BQ24400PWRG4 monitors battery temperature via the TS pin using an external NTC thermistor network. It compares the resulting voltage against three internal thresholds: VTCO (0.225 × VCC) triggers immediate charge termination; VLTF (0.5 × VCC) suspends fast charge and initiates trickle conditioning; VHTF (0.25 × VCC) pauses charging during non-fast-charge states. These responses are hardwired in the IC's state machine and require no software configuration.
Can the BQ24400PWRG4 be used for single-cell NiMH battery charging?
Yes, the BQ24400PWRG4 supports single-cell NiMH charging. The 2.00 V maximum cell voltage (VMCV) threshold applies per cell, so for a single-cell design, the BAT pin is connected directly across the cell (via appropriate resistive divider if needed). All safety features-including PVD, temperature monitoring, and trickle qualification-remain fully functional and do not require modification for single-cell use.
What external components determine the fast-charge current delivered by the BQ24400PWRG4?
The fast-charge current (IMAX) is set solely by the value of the external sense resistor RSNS connected between the battery negative terminal and the SNS pin, using the formula IMAX = 0.05 / RSNS (e.g., RSNS = 50 mΩ yields 1 A). No other passive or active components affect the regulated current magnitude; the MOD pin switches to maintain the SNS voltage within ±50 mV hysteresis band around 0 V.
Does the BQ24400PWRG4 support automatic battery insertion/removal detection?
Yes, the BQ24400PWRG4 detects battery insertion and removal autonomously. When no battery is present, BAT voltage rises above VSLP (VCC–1 V), forcing the IC into 5 µA sleep mode with MOD low and LED in high-impedance state. Battery insertion pulls BAT below VSLP, triggering automatic initialization of charge qualification-no external reset or enable signal is required.
BQ24400PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- -
- Programmable Features:
- 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-TSSOP
BQ24400PWRG4 FAQ
1.How can I place an order for BQ24400PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24400PWRG4 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 BQ24400PWRG4 reliable?
The price and inventory of BQ24400PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24400PWRG4 is usually 5 days.
3.What payment methods are accepted for BQ24400PWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24400PWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24400PWRG4?
BQ24400PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24400PWRG4 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 BQ24400PWRG4?
For technical support, including BQ24400PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24400PWRG4 requirements.
6.How does Aetrix verify that BQ24400PWRG4 is sourced from the original manufacturer or authorized distributors?
All BQ24400PWRG4 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 BQ24400PWRG4 meets industry standards.
7.What is the process for return or replacement of BQ24400PWRG4?
All BQ24400PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ24400PWRG4, 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 BQ24400PWRG4 part is unused and in its original packaging.
Return procedure for BQ24400PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ24400PWRG4 Tags
-
BQ21040DBVR
Texas Instruments
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MCP73812T-420I/OT
Microchip Technology
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MCP73831T-2ACI/OT
Microchip Technology
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MCP73832T-2ACI/OT
Microchip Technology
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MCP73831T-2DCI/OT
Microchip Technology
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MCP73832T-2DCI/OT
Microchip Technology
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MCP73831T-2ATI/OT
Microchip Technology
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MCP73832T-2ATI/OT
Microchip Technology
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MCP73831T-5ACI/OT
Microchip Technology
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MCP73832T-2ACI/MC
Microchip Technology
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MCP73831T-2ACI/MC
Microchip Technology
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MCP73831T-2ATI/MC
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