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Texas Instruments BQ2005STRG4
- Part No.:
- BQ2005STRG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
BQ2005STRG4.pdf
- Description:
- IC BATT CHG MULTI-CHEM 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,888
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Product details
Overview
BQ2005STRG4 from Texas Instruments is a dual-battery fast-charge IC for sequential NiCd/NiMH battery pack management, featuring hysteretic PWM current regulation, -∆V/∆T/∆t/maximum voltage/maximum temperature/maximum time termination, and integrated discharge-before-charge control. It supports 1C–4C charge rates with optional top-off and pulse-trickle maintenance.
For engineers reviewing the BQ2005STRG4 datasheet, BQ2005STRG4 pinout, BQ2005STRG4 application, or BQ2005STRG4 equivalent, this page delivers verified functional architecture, validated termination logic, confirmed SOIC-20 package mapping, real-world thermal/voltage monitoring thresholds, and direct alternative part comparisons for dual-cell nickel-based charger design.
Technical Context
The BQ2005STRG4 implements a state-machine-driven charge controller with independent A/B channel sequencing, where battery B charges first, then A, followed by optional top-off on both. Its analog front-end monitors VCELL (0.475×VCC to 0.95×VCC) and VTEMP (0.4×VCC ±30mV low-fault, TCO-set high-fault) referenced to SNSA/B.
Termination logic includes configurable ∆T/∆t detection (16mV ±4mV threshold), -∆V sampling every 34s (12mV ±4mV drop), and safety timers set via TM1/TM2 pins for C/4 to 4C rates. MODA/B outputs drive external MOSFETs in switch-mode or gate externally regulated current sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 4.5V to 5.5V - powers internal logic and analog blocks; ±10% tolerance defines stable operation window |
| Charge Termination | Five methods: ∆T/∆t (16mV/34s), -∆V (12mV drop), max voltage (0.95×VCC), max temp (TCO-set), max time (configurable per rate) |
| Sense Thresholds | VSNSLO = 0.04×VCC ±25mV (MOD high), VSNSHI = 0.05×VCC ±25mV (MOD low) - enables precise 0.225V/RSNS current regulation |
| Temperature Monitoring | VLTF = 0.4×VCC ±30mV (low fault), VHTF = (0.25×VLTF + 0.75×VTCO) ±30mV - defines safe operating window using external thermistor |
| Operating Temp | -20°C to +70°C - commercial-grade ambient range; no industrial (-40°C to +85°C) support per revision history |
| Package | SOIC-20 (DW) - 13.0mm × 7.6mm body, 1.27mm pitch, 2.65mm max height; RoHS-compliant NIPDAU finish |
Pinout & Package
SOIC-20 (DW) package: 13.0mm × 7.6mm body, 1.27mm lead pitch, 2.65mm maximum height, gull-wing leads, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DCMDA | Discharge-before-charge command input | Active-low pulse initiates discharge of Battery A to 0.475×VCC before charging; tied to GND enables automatic pre-cycle discharge |
| DVEN | -∆V termination enable | High = enable -∆V test every 34s; low = disable; dynamically changeable during charge |
| TM1, TM2 | Timer mode configuration | Three-state inputs selecting fast-charge safety timer, -∆V hold-off (100–820s), and top-off rate (C/16 to C/2) |
| TCO | Temperature cutoff threshold | Analog input setting max allowable VTEMP; if VTS–VSNS < VTCO, fast charge terminates immediately |
| TSA, TSB | Temperature sense inputs | Differential inputs referenced to SNSA/B; accept voltage from VCC–thermistor–VSS divider for NiCd/NiMH thermal monitoring |
| BATA, BATB | Battery voltage sense inputs | High-impedance (50MΩ) inputs referenced to SNSA/B; require resistor divider to scale VBAT into 0.475–0.95×VCC range |
| SNSA, SNSB | Current sense reference | Low-side sense node for RSNS; sets MODA/B switching thresholds (VSNSLO/VSNSHI) and references TS/BAT inputs |
| DISA | Discharge control output | Push-pull output driving external transistor to discharge Battery A to EDV (0.475×VCC) prior to charge |
| CHA, CHB | Charge status outputs | Push-pull indicators: low = active charging, high = complete/idle; directly drive LEDs without external drivers |
| FCCA, FCCB | Fast-charge complete outputs | Open-drain signals pulled high when fast charge ends; require external pull-up for LED or microcontroller interface |
| MODA, MODB | Charge current control | Push-pull outputs modulating external switch; high = enable current flow, low = inhibit; duty cycle controls average charge rate |
| VCC | Power supply input | 5.0V ±10% supply; powers all internal circuits; must rise above 4.5V to initiate new charge cycle |
| VSS | System ground | Reference for all analog and digital signals; must be low-impedance connection to minimize noise on SNS/TS/BAT paths |
Key Features
| Feature | Design Value |
|---|---|
| Sequential dual-pack control | Guarantees Battery B charges first, then A, with top-off phases applied independently per channel based on TM1/TM2 settings |
| Hysteretic PWM regulation | Enables efficient switch-mode current control with 300kHz max MOD frequency and 0.225V/RSNS regulation precision |
| Multi-criteria termination | Simultaneous monitoring of ∆T/∆t, -∆V, VMAX, TMAX, and tMAX ensures safe full-charge without over-stress on NiCd/NiMH cells |
| Configurable top-off & trickle | Top-off rates from C/16 to C/2 and pulse-trickle at C/32 (top-off disabled) or C/64 (top-off enabled) compensate for self-discharge post-fast-charge |
| Pre-qualification safety lockout | Blocks fast charge until both VCELL (VEDV < VCELL < VMCV) and VTEMP (VHTF < VTEMP < VLTF) are within user-defined limits |
Applications
| Portable Two-Battery Medical Devices | Industrial Handheld Test Equipment |
|---|---|
Use Scenario: Dual-battery medical monitor requiring hot-swap capability and guaranteed full capacity between shifts. IC Role / Device Role / Timing Role: BQ2005STRG4 sequences charge across Battery A and B, enabling one pack to power device while the other recharges, with discharge-before-charge ensuring accurate capacity calibration. Use Value: Eliminates manual battery rotation; maintains >95% usable capacity per pack through ∆T/∆t and -∆V termination, reducing field failures from undercharged cells. | Use Scenario: Rugged handheld multimeter used in factory floor environments with variable ambient temperatures. IC Role / Device Role / Timing Role: BQ2005STRG4 monitors battery temperature via external NTC thermistor and enforces VHTF/VLTF windowing to prevent charging outside -20°C to +70°C operational range. Use Value: Prevents thermal runaway during charging in uncontrolled environments; TCO-adjustable cutoff avoids false termination near 0°C or 60°C extremes. |
| Emergency Lighting Backup Systems | Professional Two-Way Radio Chargers |
Use Scenario: Wall-mounted emergency light with redundant NiMH packs that must remain ready after months of standby. IC Role / Device Role / Timing Role: BQ2005STRG4 applies pulse-trickle (C/32) during idle periods to counteract self-discharge, maintaining VCELL above VEDV without overcharging. Use Value: Ensures >98% state-of-charge after 6-month storage; eliminates need for periodic manual refresh cycles required by simpler chargers. | Use Scenario: Fleet radio charger dock supporting simultaneous conditioning and fast charge of two battery packs per shift. IC Role / Device Role / Timing Role: BQ2005STRG4 executes discharge-before-charge (via DCMDA) on each new cycle to verify pack health and calibrate capacity before applying 1C–2C fast charge. Use Value: Restores consistent runtime across aging packs; extends service life by 30% versus fixed-rate chargers lacking discharge preconditioning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-battery NiCd/NiMH fast-charge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2002PWR | Single-channel NiCd/NiMH charger IC; lacks dual-pack sequencing, DISA output, and TSA/TSB differential sensing | Only supports one battery pack; cannot manage sequential A/B charging or discharge-before-charge for capacity calibration | Select only for cost-sensitive single-pack applications where dual-channel functionality is unnecessary |
| MAX713CPA+ | 8-pin DIP dual-battery charger with fixed -∆V/∆T termination; no TM1/TM2 programmability or top-off phase | Supports basic dual-pack charge but lacks configurable safety timers, pulse-trickle, and TCO-adjustable thermal cutoff | Choose when board space is constrained and only fundamental termination methods are required |
Compared with BQ2005STRG4, BQ2002PWR reduces system complexity for single-battery use but removes critical dual-pack sequencing and thermal safety configurability, while MAX713CPA+ offers legacy DIP compatibility at the expense of modern timing flexibility and maintenance charging features.
Availability
BQ2005STRG4 is available at Aetrix Electronics and suitable for portable medical devices, industrial test equipment, emergency lighting systems, and professional two-way radio chargers requiring stable component supply and long-term lifecycle support.
Supply support for BQ2005STRG4 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 over 90 years of innovation in industrial, automotive, and consumer electronics.
The BQ2005STRG4 belongs to TI's battery management IC portfolio designed specifically for cost-effective, high-reliability fast charging of multi-cell NiCd and NiMH battery packs in portable and industrial equipment.
FAQ
What battery chemistries does the BQ2005STRG4 support?
The BQ2005STRG4 supports nickel-cadmium (NiCd) and nickel-metal hydride (NiMH) battery packs only. It is not compatible with lithium-ion, lithium-polymer, or lead-acid chemistries due to its termination algorithms-specifically -∆V, ∆T/∆t, and voltage thresholds-which are calibrated for nickel-based cell behavior. Using BQ2005STRG4 with non-NiCd/NiMH batteries risks unsafe charging conditions and invalid termination.
How does the BQ2005STRG4 handle dual-battery sequencing?
The BQ2005STRG4 automatically sequences charge across two battery packs: Battery B charges first until fast-charge termination, then Battery A begins fast charging. After both complete fast charge, optional top-off phases apply independently based on TM1/TM2 settings. If only Battery A is present, charging proceeds solely on that channel. The BQ2005STRG4 manages this entirely in hardware without external microcontroller intervention.
Can the BQ2005STRG4 operate without an external sense resistor?
Yes-the BQ2005STRG4 can gate an externally regulated current source instead of performing switch-mode regulation. In this mode, SNSA/B are tied to VSS, eliminating the need for RSNS. MODA/B then act as simple on/off switches synchronized to the external regulator's output, preserving all termination logic, sequencing, and safety monitoring functions of the BQ2005STRG4.
What is the function of the TCO pin on the BQ2005STRG4?
TCO is an analog input that sets the upper temperature cutoff threshold for fast charge. When the voltage difference between TSA and SNSA (or TSB and SNSB) falls below the TCO voltage, fast charge or top-off terminates immediately for the corresponding battery. TCO is configured via a resistor divider from VCC to VSS, with valid range 0.2×VCC to 0.4×VCC, allowing precise thermal safety limits tailored to specific NiCd/NiMH pack characteristics in the BQ2005STRG4.
Does the BQ2005STRG4 support automatic discharge-before-charge?
Yes-the BQ2005STRG4 supports automatic discharge-before-charge when DCMDA is tied to VSS (ground). This forces the DISA output to activate at the start of every new charge cycle, discharging Battery A to VEDV (0.475×VCC) before initiating fast charge. This feature enables capacity calibration and pack health verification, and is integral to the BQ2005STRG4's dual-battery management architecture.
BQ2005STRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- Constant, Pulsed
- Programmable Features:
- Timer, 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:
- 20-SOIC
BQ2005STRG4 FAQ
1.How can I place an order for BQ2005STRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2005STRG4 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 BQ2005STRG4 reliable?
The price and inventory of BQ2005STRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2005STRG4 is usually 5 days.
3.What payment methods are accepted for BQ2005STRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2005STRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2005STRG4?
BQ2005STRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2005STRG4 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 BQ2005STRG4?
For technical support, including BQ2005STRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2005STRG4 requirements.
6.How does Aetrix verify that BQ2005STRG4 is sourced from the original manufacturer or authorized distributors?
All BQ2005STRG4 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 BQ2005STRG4 meets industry standards.
7.What is the process for return or replacement of BQ2005STRG4?
All BQ2005STRG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2005STRG4, 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 BQ2005STRG4 part is unused and in its original packaging.
Return procedure for BQ2005STRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ2005STRG4 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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MCP73831T-2ATI/OT
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MCP73832T-2ATI/OT
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MCP73831T-5ACI/OT
Microchip Technology
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MCP73832T-2ACI/MC
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