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Texas Instruments BQ2004ESNTRG4
- Part No.:
- BQ2004ESNTRG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
BQ2004ESNTRG4.pdf
- Description:
- IC BATT CONTRL MULTI-CHEM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,683
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Product details
Overview
BQ2004ESNTRG4 from Texas Instruments is a monolithic CMOS fast-charge IC for NiCd/NiMH batteries, providing closed-loop hysteretic PWM current regulation (IREG = 0.225V/RSNS), six independent fast-charge termination methods (∆T/∆t, -∆V, PVD, max voltage, max temperature, max time), and logic-level low-power mode (<1 µA standby). It supports discharge-before-charge, configurable LED status outputs, and operates across -20°C to +70°C ambient.
For engineers reviewing the BQ2004ESNTRG4 datasheet, BQ2004ESNTRG4 pinout, BQ2004ESNTRG4 application, or BQ2004ESNTRG4 equivalent, key selection considerations include its 16-pin SOIC package, VCC = 4.5–5.5 V operation, SNS-based current sensing thresholds (VSNSLO = 0.04×VCC ±25 mV, VSNSHI = 0.05×VCC ±25 mV), and support for two-cell battery voltage monitoring with resistor-divider scaling.
Technical Context
The BQ2004ESNTRG4 implements a state-machine-driven charge algorithm with pre-charge qualification (VEDV < VCELL < VMCV, VHTF < VTEMP < VLTF), hold-off period (260 µs on / 1820 µs off modulation), and multi-phase charging (fast → optional top-off → pulse-trickle). Its MOD output drives external switching FETs or gates regulated current sources.
Termination logic integrates analog sensing (TS, BAT, SNS referenced to SNS) with digital timing control via TM1/TM2 inputs, enabling programmable safety timers (e.g., 39–650 min fast-charge limit), PVD/-∆V hold-off (68–546 s), and top-off rate (C/16 to C/2). Voltage sampling occurs every 34 s (16 or 32 measurements per sample), rejecting 50/60 Hz ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - powers internal logic and analog blocks; ±10% tolerance defines valid operating window |
| Fast-Charge Termination | Six methods: ∆T/∆t (16 mV drop over 68 s), -∆V (12 mV/cell), PVD (6 mV/cell), max voltage (VMCV = 0.8×VCC ±30 mV), max temp (VTCO threshold), max time (configurable up to 650 min) |
| SNS Thresholds | VSNSLO = 0.04×VCC ±25 mV (MOD high), VSNSHI = 0.05×VCC ±25 mV (MOD low) - sets 10 mV hysteresis for current regulation |
| Standby Current | <1 µA - achieved when INH = low; enables ultra-low-power storage or system sleep modes |
| Operating Temp | -20°C to +70°C - commercial-grade range validated for portable charger and industrial battery-pack applications |
| LED Outputs | LED1/LED2 push-pull - directly drive indicator LEDs per Table 2 display modes (e.g., Mode 1: Fast charge = LED1 low / LED2 high) |
| MOD Frequency | Up to 300 kHz - supports high-efficiency switch-mode regulator design with minimal external component count |
Pinout & Package
Package: 16-pin narrow SOIC (SOIC-D, 3.9 mm width, 1.75 mm height, JEDEC MS-012AC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INH) | Charge inhibit input | Active-low signal that suspends all charge actions and forces outputs to high-impedance; transition high initiates new charge cycle |
| 2 (DIS) | Discharge control output | Push-pull driver for external transistor; enables discharge-before-charge to end-of-discharge voltage (EDV) |
| 3 (MOD) | Charge current control output | Push-pull gate driver for external switch; regulates charging current via SNS feedback with 260 µs/1820 µs modulation during hold-off/top-off |
| 4 (VCC) | Power supply input | 5.0 V ±10% CMOS supply; powers internal oscillator, state machine, and analog comparators |
| 5 (VSS) | System ground | Reference node for all analog inputs (BAT, TS, TCO, SNS); must be low-impedance connection to minimize noise |
| 6 (LED2) | Charge status output 2 | Configurable push-pull LED driver; behavior defined by DSEL and charge state (e.g., Mode 1: Fast charge = high) |
| 7 (LED1) | Charge status output 1 | Configurable push-pull LED driver; used with LED2 for dual-status indication per Table 2 |
| 8 (SNS) | Charging current sense input | Reference potential for BAT and TS; voltage drop across RSNS determines MOD duty cycle (IREG = 0.225 V / RSNS) |
| 9 (DCMD) | Discharge command input | Internally pulled-up; negative pulse triggers immediate discharge-before-charge; tied low enables automatic discharge on every cycle |
| 10 (DSEL) | Display select input | Three-state control (VSS/floating/VCC) selecting LED1/LED2 behavior and enabling/disabling top-off/pulse-trickle |
| 11 (VSEL) | Voltage termination select | Three-state input selecting termination method: high = PVD, floating = -∆V, low = both disabled |
| 12 (TM1) | Timer mode select 1 | Three-state input configuring fast-charge safety timer, hold-off, top-off, and trickle rates per Table 1 |
| 13 (TM2) | Timer mode select 2 | Three-state input paired with TM1 to define full timing configuration (e.g., TM1=low/TM2=high → 77 min fast-charge limit for BQ2004E) |
| 14 (TCO) | Temperature cutoff threshold | Analog input setting max allowable battery temperature; voltage divider between VCC and VSS configures VTCO = 0.2–0.4×VCC |
| 15 (TS) | Temperature sense input | Input for NTC thermistor network; referenced to SNS; used for ∆T/∆t detection and thermal fault protection |
| 16 (BAT) | Battery voltage input | High-impedance sense node for two-cell battery; requires resistor divider (RB1/RB2 = N/2−1) to scale VPACK into 0.4–0.8×VCC range |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic PWM current regulation | Enables efficient switch-mode charger design without external error amplifier or compensation components |
| Six independent fast-charge termination methods | Provides robust, chemistry-adaptive safety coverage-no single-point failure can prevent safe shutdown |
| Discharge-before-charge capability | Supports battery conditioning and capacity determination via controlled EDV discharge before each charge cycle |
| Configurable LED status outputs | Eliminates need for external microcontroller or logic to indicate charge phase (pending, fast, complete, absent) |
| Programmable timing via TM1/TM2 | Allows one IC to serve multiple battery capacities and chemistries by adjusting safety timers and top-off rates |
| Logic-level low-power inhibit (INH) | Reduces system standby power to sub-microwatt levels while preserving full state retention and instant wake-on-charge |
Applications
| Portable Power Tools | Medical Battery Packs |
|---|---|
Use Scenario: Cordless drill/driver with removable NiMH battery pack requiring rapid recharging between shifts. IC Role / Device Role / Timing Role: Primary fast-charge controller managing current regulation, temperature/voltage monitoring, and multi-criteria termination. Use Value: Enables full recharge in under 1 hour with built-in cell-balancing via discharge-before-charge and thermal fault protection meeting IEC 62133. | Use Scenario: Portable ultrasound or infusion pump using sealed NiMH packs needing reliable, maintenance-free charging in clinical environments. IC Role / Device Role / Timing Role: Standalone charger IC implementing medical-grade safety protocols including dual-temperature fault detection (VHTF/VLTF) and max-time enforcement. Use Value: Eliminates risk of overcharge or thermal runaway through redundant termination (PVD + ∆T/∆t + max temp), supporting long-term reliability in life-critical devices. |
| Consumer Electronics Chargers | Industrial Test Equipment |
Use Scenario: Desktop charger for RC hobby batteries (AA/AAA NiMH) with LED status feedback and auto-restart on battery insertion. IC Role / Device Role / Timing Role: System-integrated charge manager handling battery presence detection, pre-qualification, and top-off/maintenance phases. Use Value: Reduces BOM cost by integrating LED drivers, timing logic, and analog comparators-no MCU or external regulators required. | Use Scenario: Benchtop multimeter or oscilloscope with internal rechargeable battery requiring unattended overnight charging with zero user intervention. IC Role / Device Role / Timing Role: Autonomous charger IC executing full algorithm (pending → fast → top-off → pulse-trickle) without host supervision. Use Value: Guarantees full capacity restoration via optional top-off (0.235×fast-charge time) and compensates self-discharge with C/512 pulse-trickle, extending runtime between charges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast-charge control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2004HPN | Same functionality but scaled timing: fast-charge safety time, hold-off, and top-off durations doubled vs. BQ2004ESNTRG4; different LED display mapping (Table 2) | Preferred for slower-charge-rate systems (e.g., C/8) where longer safety windows improve margin for aging cells | Select BQ2004HPN only if extended timing parameters align with battery chemistry and pack size requirements |
| BQ2010SN | Dedicated NiCd/NiMH charger with integrated power FETs (vs. external MOD-driven FETs); fixed -∆V/PVD termination; no discharge-before-charge or pulse-trickle | Suitable for cost-sensitive, space-constrained designs where external MOSFETs are undesirable and advanced features are unnecessary | Choose BQ2010SN when simplifying layout and reducing external component count outweighs flexibility in termination and maintenance charging |
Compared with BQ2004ESNTRG4, BQ2004HPN offers doubled timing constants for enhanced safety margin with aging batteries, while BQ2010SN trades configurability for integration-eliminating external FETs but removing discharge-before-charge and pulse-trickle capabilities critical for high-reliability applications.
Availability
BQ2004ESNTRG4 is available at Aetrix Electronics and suitable for portable power tools, medical battery packs, consumer electronics chargers, and industrial test equipment requiring stable component supply and long-lifecycle support.
Supply support for BQ2004ESNTRG4 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 and embedded processing solutions, with deep expertise in power management and battery interface ICs.
The BQ2004E/H product line was designed specifically for cost-effective, standalone or system-integrated NiCd/NiMH fast chargers-emphasizing safety, configurability, and minimal external component count.
FAQ
What battery chemistries does the BQ2004ESNTRG4 support?
The BQ2004ESNTRG4 is explicitly designed for nickel-cadmium (NiCd) and nickel-metal hydride (NiMH) batteries. Its termination algorithms-including -∆V, peak voltage detection (PVD), and ∆T/∆t-are calibrated for the voltage and thermal profiles of these chemistries. It does not support lithium-ion or lead-acid batteries, as their charge profiles and safety requirements differ fundamentally. The BQ2004ESNTRG4 datasheet confirms compatibility only with NiCd/NiMH in both the General Description and Absolute Maximum Ratings sections.
How does the BQ2004ESNTRG4 implement discharge-before-charge?
The BQ2004ESNTRG4 implements discharge-before-charge via the DCMD input and DIS output. When DCMD is tied low, the IC automatically initiates discharge on every new charge cycle start, driving DIS high until the battery voltage (VCELL) falls to the end-of-discharge voltage (VEDV = 0.4×VCC ±30 mV). A negative-going pulse on DCMD triggers immediate discharge regardless of state. This function is confirmed in the Pin Descriptions and Functional Description sections of the BQ2004ESNTRG4 datasheet, and supports battery conditioning and capacity determination.
What are the voltage thresholds for battery and temperature qualification before fast charge begins?
Before fast charge starts, the BQ2004ESNTRG4 requires VCELL to be between VEDV (0.4×VCC ±30 mV) and VMCV (0.8×VCC ±30 mV), and VTEMP to be between VHTF ((1/3×VLTF)+(2/3×VTCO) ±30 mV) and VLTF (0.4×VCC ±30 mV). These thresholds are defined in the DC Thresholds table and validated in the Pre-charge Qualification section of the BQ2004ESNTRG4 datasheet. If either condition fails, the IC enters charge-pending mode and applies top-off or trickle charge until limits are met.
Can the BQ2004ESNTRG4 be used with multi-cell battery packs?
Yes-the BQ2004ESNTRG4 is designed for two-cell NiCd/NiMH packs, as stated in the General Description and Figure 1. The BAT input expects a two-cell voltage (e.g., ~2.4 V nominal), and the recommended resistor divider ratio RB1/RB2 = N/2−1 ensures proper scaling for N-cell packs. For example, a four-cell pack requires RB1/RB2 = 1. The datasheet specifies "battery voltage sense input, referenced to SNS" and confirms two-cell operation in the Voltage and Temperature Monitoring diagram, making it unsuitable for direct use with single-cell or >4-cell configurations without redesign.
What is the purpose of the SNS pin and how is current regulation achieved?
The SNS pin serves as the reference potential for BAT and TS inputs and enables current regulation by sensing voltage drop across an external sense resistor (RSNS). When the SNS voltage falls below VSNSLO (0.04×VCC ±25 mV), MOD goes high to enable charging current; when it exceeds VSNSHI (0.05×VCC ±25 mV), MOD goes low to inhibit current. This 10 mV hysteresis creates constant-current regulation with IREG = 0.225 V / RSNS. This mechanism is detailed in the Charge Current Control section and DC Thresholds table of the BQ2004ESNTRG4 datasheet.
BQ2004ESNTRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- Constant, Pulsed
- Programmable Features:
- Voltage
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 5.5V
- Interface:
- -
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
BQ2004ESNTRG4 FAQ
1.How can I place an order for BQ2004ESNTRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2004ESNTRG4 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 BQ2004ESNTRG4 reliable?
The price and inventory of BQ2004ESNTRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2004ESNTRG4 is usually 5 days.
3.What payment methods are accepted for BQ2004ESNTRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2004ESNTRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2004ESNTRG4?
BQ2004ESNTRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2004ESNTRG4 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 BQ2004ESNTRG4?
For technical support, including BQ2004ESNTRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2004ESNTRG4 requirements.
6.How does Aetrix verify that BQ2004ESNTRG4 is sourced from the original manufacturer or authorized distributors?
All BQ2004ESNTRG4 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 BQ2004ESNTRG4 meets industry standards.
7.What is the process for return or replacement of BQ2004ESNTRG4?
All BQ2004ESNTRG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2004ESNTRG4, 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 BQ2004ESNTRG4 part is unused and in its original packaging.
Return procedure for BQ2004ESNTRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ2004ESNTRG4 Tags
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Texas Instruments
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