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Texas Instruments BQ24401DG4
- Part No.:
- BQ24401DG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
BQ24401DG4.pdf
- Description:
- IC BATT CHG MULTI-CHEM 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,629
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Product details
Overview
BQ24401DG4 from Texas Instruments is a programmable monolithic NiCd/NiMH fast-charge management IC in 8-pin SOIC package, featuring ΔT/Δt and maximum temperature-based charge termination, programmable trickle-charge (1 Hz pulse), and integrated MOD push-pull output for external FET control. It supports single- or multi-cell battery packs in portable medical devices and industrial handheld tools requiring safe, autonomous nickel-based charging.
For engineers reviewing the BQ24401DG4 datasheet, BQ24401DG4 pinout, BQ24401DG4 application, or BQ24401DG4 equivalent, key selection criteria include its 5 V ±20% supply range, 2.00 V maximum cell voltage threshold, 0.225 × VCC temperature cutoff, 1 µA sleep current, and RC-programmable MTO timing with hold-off period = MTO/32.
Technical Context
The BQ24401DG4 implements a hysteretic current-regulation loop using SNS input to control MOD output, enabling precise fast-charge current setting via external sense resistor RSNS (IMAX = 0.05 / RSNS). Its internal ADC samples TS every 8 seconds during fast charge to compute ΔT/Δt at VCC/161 V/min resolution.
Charge state progression follows a deterministic finite-state machine: qualification → conditioning (trickle) → fast charge → optional top-off → maintenance trickle. Sleep mode activates when BAT > VSLP (VCC–1 V), reducing ICCS to 5 µA while holding MOD low and LED in high-impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Range | 4 V to 6 V - defines compatible input rail for charger controller operation |
| VMCV Threshold | 2.00 V ±2.5% - sets absolute upper limit for per-cell voltage during fast/top-off charge |
| VTCO Cutoff Voltage | 0.225 × VCC ±5% - triggers immediate charge termination if battery temperature exceeds safe limit |
| Trickle Frequency | 1 Hz - enables periodic low-current pulses to revive deeply discharged NiCd/NiMH cells |
| Sleep Current | 5 µA - ensures minimal standby power draw when no battery is present or fully charged |
| MOD Output Type | Push-pull - directly drives external N-channel MOSFET gate without level-shifting circuitry |
| TS Sampling Interval | Every 8 seconds during fast charge - balances thermal response time with noise immunity |
Pinout & Package
Package: 8-pin SOIC (DG4 suffix), 3.9 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SNS | Current-sense input | Differential voltage across external RSNS resistor; sets fast-charge current IMAX = 0.05 / RSNS |
| VSS | System ground | Reference node for all analog comparators and digital logic; connects to battery negative terminal |
| LED | Charge-status output | Open-drain indicator: 1 Hz flash (qualification), low (fast charge), high-Z (sleep/complete) |
| BAT | Battery-voltage sense input | Resistive divider input monitoring pack voltage; triggers sleep mode if > VSLP = VCC–1 V |
| TS | Temperature-sense input | Accepts thermistor divider voltage; used for VLTF (0.5 × VCC), VHTF (0.25 × VCC), VTCO (0.225 × VCC) |
| RC | Timer-program input | RC network sets MTO (max charge time), hold-off period (MTO/32), top-off enable, and trickle pulse width |
| VCC | Supply-voltage input | Power rail requiring 10 µF + 0.1–0.22 µF local decoupling; operates 4–6 V |
| MOD | Modulation-control output | Push-pull driver for external series FET; high = charge enabled, low = current inhibited |
Key Features
| Feature | Design Value |
|---|---|
| ΔT/Δt Termination | Measures TS voltage change every 8 s; terminates fast charge if dV/dt < –VCC/161 V/min - prevents thermal runaway |
| Programmable Hold-Off | MTO/32 delay disables ΔT/Δt at start - avoids false termination on new NiMH cells with initial temperature rise |
| Top-Off Charge | Optional 1-second pulses at 1/16 × IMAX; extends capacity by ~3–5% in NiMH packs with voltage depression |
| Pre-Charge Qualification | Enforces VBAT > 950 mV before fast charge - blocks charging of shorted, damaged, or frozen cells |
| Thermal Fault Hierarchy | Three-tier TS thresholds (VTCO, VHTF, VLTF) enable differentiated responses: terminate, suspend, or condition |
Applications
| Portable Medical Devices | Industrial Handheld Tools |
|---|---|
|
Use Scenario: Rechargeable NiMH battery packs in cordless blood pressure monitors and glucose meters requiring CE-compliant, fail-safe charging. IC Role / Device Role / Timing Role: Primary charge controller managing full algorithm (qualification → fast → top-off → trickle) with independent thermal supervision. Use Value: Eliminates need for microcontroller-based charging logic while ensuring compliance with IEC 62368-1 thermal safety limits. |
Use Scenario: Multi-cell NiCd packs in ruggedized torque wrenches and inspection cameras deployed in factory environments. IC Role / Device Role / Timing Role: Autonomous charge manager handling variable ambient temperatures (–20°C to 70°C) and intermittent usage patterns. Use Value: Enables reliable field recharging without host processor intervention, leveraging built-in VLTF/VHTF fault detection. |
| Emergency Lighting Systems | Two-Way Radio Chargers |
|
Use Scenario: Standby NiCd battery systems in exit signs and emergency beacons where long shelf life and infrequent deep discharge occur. IC Role / Device Role / Timing Role: Maintenance charger providing 1 Hz trickle pulses to counter self-discharge while preventing overcharge. Use Value: Maintains >95% capacity after 12-month storage with zero risk of thermal excursion during trickle phase. |
Use Scenario: Desktop chargers for professional-grade PMR446 radios using 4-cell NiMH packs with strict runtime consistency requirements. IC Role / Device Role / Timing Role: Fast-charge supervisor enforcing ΔT/Δt + max-time dual termination to guarantee repeatable 90-minute recharge cycles. Use Value: Delivers consistent end-of-charge voltage (≤2.00 V/cell) across 500+ cycles, minimizing capacity fade. |
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 |
|---|---|---|---|
| BQ24400DG4 | No top-off mode; fixed trickle only; identical pinout and RC programming interface | Lacks optional top-off pulse capability - suitable only where NiMH capacity optimization is not required | Select BQ24400DG4 when simplified charging without top-off suffices and cost reduction is prioritized |
| MAX713CPA+ | 5 V fixed supply; no RC-programmable timing; uses external RC for ΔT/Δt slope calibration | Requires separate timer IC for max-time termination; lacks integrated hold-off period and sleep mode | Choose MAX713CPA+ only when legacy design reuse mandates DIP-8 footprint and discrete timing components |
Compared with BQ24401DG4, BQ24400DG4 removes top-off functionality but retains identical safety thresholds and pin compatibility, while MAX713CPA+ requires additional external components to achieve comparable termination robustness and offers no sleep-mode power savings.
Availability
BQ24401DG4 is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld tools, emergency lighting systems, and two-way radio chargers requiring stable component supply across extended production lifecycles.
Supply support for BQ24401DG4 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 and embedded processing technologies, with decades of expertise in battery management and power conversion ICs.
The BQ24401DG4 belongs to TI's dedicated nickel-chemistry charge controller product line, engineered specifically for autonomous, high-reliability NiCd/NiMH charging in safety-critical portable equipment without microcontroller dependency.
FAQ
What is the primary function of the BQ24401DG4 in a battery charging system?
The BQ24401DG4 serves as a fully autonomous NiCd/NiMH fast-charge management IC that executes the complete charging algorithm - including pre-qualification, fast charge with ΔT/Δt and max-time termination, optional top-off, and maintenance trickle - without requiring a host microcontroller. Its MOD output directly controls an external series FET, and its LED output provides real-time status indication.
How does the BQ24401DG4 implement temperature-based charge termination?
The BQ24401DG4 uses the TS pin to monitor a thermistor-based voltage divider. It compares the TS voltage against three internal thresholds: VTCO (0.225 × VCC) for immediate termination, VHTF (0.25 × VCC) for hot-fault suspension outside fast charge, and VLTF (0.5 × VCC) for cold-fault suspension during fast charge or top-off. These thresholds scale with VCC, maintaining accuracy across supply variations.
Can the BQ24401DG4 be used with both NiCd and NiMH battery chemistries?
Yes, the BQ24401DG4 is explicitly designed for both NiCd and NiMH chemistries. It applies identical termination criteria - ΔT/Δt, maximum cell voltage (2.00 V), and maximum charge time - to both, while supporting NiMH-specific top-off charging to recover capacity lost due to voltage depression. Its qualification logic (VLBAT = 950 mV) and trickle frequency (1 Hz) are validated for both chemistries.
What is the role of the RC pin on the BQ24401DG4, and how is it configured?
The RC pin on the BQ24401DG4 accepts an external resistor-to-ground and capacitor-to-VCC network to program multiple functions: maximum charge time (MTO = RMTO × CMTO × 35,988 minutes), hold-off period (MTO/32), top-off enable/disable (CMTO > 0.13 µF enables), and trickle pulse width (set by RMTO value per Figure 5). The RC pin exhibits distinct waveforms (DC, sawtooth, or grounded) indicating operational state.
Does the BQ24401DG4 support battery removal and insertion detection?
Yes, the BQ24401DG4 inherently detects battery removal and insertion through its BAT pin monitoring. When no battery is connected, BAT voltage rises above VSLP (VCC–1 V), triggering sleep mode (MOD low, LED high-Z, ICCS = 5 µA). Insertion of a battery below VMCV (2.00 V) automatically exits sleep mode and initiates charge qualification. This behavior is documented in the functional state diagram and sleep-mode description.
BQ24401DG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- -
- Programmable Features:
- Timer
- 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
BQ24401DG4 FAQ
1.How can I place an order for BQ24401DG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24401DG4 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 BQ24401DG4 reliable?
The price and inventory of BQ24401DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24401DG4 is usually 5 days.
3.What payment methods are accepted for BQ24401DG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24401DG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24401DG4?
BQ24401DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24401DG4 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 BQ24401DG4?
For technical support, including BQ24401DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24401DG4 requirements.
6.How does Aetrix verify that BQ24401DG4 is sourced from the original manufacturer or authorized distributors?
All BQ24401DG4 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 BQ24401DG4 meets industry standards.
7.What is the process for return or replacement of BQ24401DG4?
All BQ24401DG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ24401DG4, 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 BQ24401DG4 part is unused and in its original packaging.
Return procedure for BQ24401DG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ24401DG4 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
Microchip Technology
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