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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Battery Chargers

Texas Instruments BQ2002ESNTR

Name: BQ2002ESNTR
Brand: Texas Instruments
SKU: BQ2002ESNTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BQ2002ESNTR

Manufacturer:: Texas Instruments

Category:: Battery Chargers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: BQ2002ESNTR.pdf

Description:: IC BATT CONTRL MULTI-CHEM 8SOIC

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Product details

Overview

BQ2002ESNTR from Texas Instruments is a CMOS NiCd/NiMH fast-charge management IC in 8-pin SOIC (D) package, featuring -∆V and peak voltage detection (PVD) termination, maximum voltage (2 V ±5%), temperature cutoff (0.5 × VCC ±5%), and configurable fast-charge safety timer (40–200 min). It drives an external MOSFET via open-drain CC output and provides LED status indication for charge state monitoring in portable battery-powered systems.

For engineers reviewing the BQ2002ESNTR datasheet, BQ2002ESNTR pinout, BQ2002ESNTR application, or BQ2002ESNTR equivalent, key selection criteria include its dual-termination logic (-∆V/PVD), TM-pin-selectable timing modes, pulse-trickle rate (C/32), low-power shutdown threshold (VCC − 1.5 V), and compatibility with single- to multi-cell NiCd/NiMH packs requiring precise, cost-effective charging control without microcontroller supervision.

Technical Context

The BQ2002ESNTR implements a state-machine-based charge controller with synchronized voltage sampling-triggered by INH pulses-to reject 50/60 Hz line ripple during -∆V or PVD detection. Its analog front-end includes high-impedance BAT input (≥50 MΩ) and thermistor-sense TS input (0.5–VCC range), enabling accurate cell-voltage and temperature monitoring using external resistor-divider and NTC networks.

Charge sequencing is fully autonomous: fast charge initiates on VCC power-up or BAT voltage drop below 2 V, then terminates on any of five conditions--∆V (−12 mV ±3 mV), PVD (−2.5 mV ±2.5 mV), VBAT ≥ 2 V, VTS < 0.5 × VCC, or TM-configured timeout. Post-fast-charge top-off (C/16 average rate) and maintenance pulse-trickle (C/32, 1.17 s period) are optional and TM-selectable.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.0–6.0 V - supports standard 5 V rail with ±20% tolerance; enables direct use with USB-powered or wall-adapter-based chargers.
Fast-Charge Termination	-∆V (−12 mV ±3 mV) or PVD (−2.5 mV ±2.5 mV) - selectable via TM pin; sampling synchronized to INH pulses to suppress AC ripple artifacts.
Max Cell Voltage Limit	2 V ±5% - hard clamp preventing overvoltage damage to NiCd/NiMH cells; triggers immediate termination if exceeded.
Temperature Cutoff	0.5 × VCC ±5% at TS pin - corresponds to ~2.5 V at 5 V supply; disables fast charge if battery thermistor indicates unsafe thermal condition.
Standby Current	<1 µA - achieved in low-power mode when VBAT ≥ VCC − 1.5 V; critical for long-term storage or battery-backed applications.
CC Output Type	Open-drain - allows direct interface to external N-channel MOSFET gate; sinks up to 10 mA for robust charge-current switching.
LED Output	Open-drain with Z-state idle - pulls low only during active fast charge; high-Z otherwise, enabling shared LED bus or external pull-up flexibility.

Pinout & Package

Package: 8-pin SOIC (D), 150-mil width, 1.75 mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1 (260°C reflow unlimited).

Pin/Terminal	Circuit Role	Design Meaning
1 (VCC)	Positive supply input	Accepts 4.0–6.0 V; powers internal bandgap reference, logic, and comparators; must be bypassed with ≥0.1 µF ceramic capacitor.
2 (VSS)	System ground	Reference node for all analog measurements (BAT, TS) and digital logic; requires low-impedance connection to minimize noise coupling.
3 (BAT)	Battery voltage sense	High-impedance input (≥50 MΩ); monitors divided cell voltage; valid range 0–VCC; used for PVD/-∆V, VMCV, and VLBAT checks.
4 (TS)	Temperature sense input	Accepts voltage from NTC thermistor divider (VCC–TS–VSS); triggers thermal cutoff if VTS < 0.5 × VCC ±5%.
5 (INH)	Charge inhibit control	Active-high logic input; suspends fast charge and top-off while preserving trickle; resets voltage history on >12 ms high pulse.
6 (CC)	Charge control output	Open-drain driver for external MOSFET; modulated during top-off (73 ms on / 1097 ms off); sinks 10 mA max at 0.8 V.
7 (LED)	Charge status indicator	Open-drain output; driven low only during fast charge; high-Z otherwise - supports shared LED or custom status signaling.
8 (TM)	Timer mode select	Three-level analog input (low/mid/high) setting fast-charge time, top-off duration, PVD/-∆V mode, hold-off, and trickle rate.

Key Features

Feature	Design Value
Multi-criteria fast-charge termination	Simultaneous monitoring of -∆V, PVD, voltage ceiling (2 V), temperature (0.5 × VCC), and TM-configured time - eliminates reliance on single-point failure modes.
Synchronized voltage sampling	INH-triggered sampling (100 ns–3.5 ms pulses) rejects 50/60 Hz ripple; 32-sample PVD or 16-sample -∆V averaging ensures stable termination under noisy supply conditions.
Configurable top-off and pulse-trickle	TM-selectable top-off (C/16 avg. rate, 40–200 min) and maintenance trickle (C/32, 1.17 s period) extend capacity retention without overcharge risk.
Low-power shutdown mode	Automatic entry when VBAT ≥ VCC − 1.5 V; reduces ICC to <1 µA - preserves system battery during storage or standby.
Direct LED status signaling	Dedicated open-drain LED output with unambiguous fast-charge-only low-state - eliminates need for external logic or MCU polling.

Applications

Portable Medical Devices	Two-Way Radios
Use Scenario: Rechargeable NiMH battery pack in handheld blood glucose meters or portable ECG monitors requiring reliable, maintenance-free charging between clinical uses. IC Role / Device Role / Timing Role: Autonomous charge manager performing full-cycle control - fast charge, top-off, and pulse-trickle - without host processor intervention. Use Value: Ensures consistent cell voltage and temperature compliance across repeated cycles, extending battery service life and meeting IEC 60601-1 leakage current limits during charging.	Use Scenario: Battery charger circuit in professional land-mobile radios where rapid recharge between field operations is essential and ambient temperature varies widely. IC Role / Device Role / Timing Role: Dual-termination charge controller using both -∆V and temperature sensing to adapt to hot/cold environments and prevent thermal runaway. Use Value: Prevents premature termination in cold weather (via VLBAT validation) and avoids overtemperature faults in hot enclosures (via TS-based cutoff), improving operational uptime.
Power Tools	Emergency Lighting
Use Scenario: Charging subsystem in cordless drill/driver battery packs where high-current fast charge must coexist with strict safety margins. IC Role / Device Role / Timing Role: Primary charge safety supervisor enforcing maximum voltage (2 V), time-limited fast charge (configurable via TM), and real-time temperature monitoring. Use Value: Guarantees no cell exceeds safe voltage or temperature thresholds during aggressive C/2 or 1C charging, satisfying UL 2580 and IEC 62133 requirements.	Use Scenario: Standby battery charger in commercial emergency exit signs powered by AC mains with NiCd backup batteries. IC Role / Device Role / Timing Role: Maintenance charger providing periodic pulse-trickle (C/32) to offset self-discharge while disabling fast charge unless battery voltage drops below 0.175 × VCC. Use Value: Maintains battery readiness over years of standby with zero risk of overcharge or thermal stress, complying with NFPA 101 and EN 1838 luminance hold-time mandates.

Portable Medical Devices

Two-Way Radios

Use Scenario: Rechargeable NiMH battery pack in handheld blood glucose meters or portable ECG monitors requiring reliable, maintenance-free charging between clinical uses.

IC Role / Device Role / Timing Role: Autonomous charge manager performing full-cycle control - fast charge, top-off, and pulse-trickle - without host processor intervention.

Use Value: Ensures consistent cell voltage and temperature compliance across repeated cycles, extending battery service life and meeting IEC 60601-1 leakage current limits during charging.

Use Scenario: Battery charger circuit in professional land-mobile radios where rapid recharge between field operations is essential and ambient temperature varies widely.

IC Role / Device Role / Timing Role: Dual-termination charge controller using both -∆V and temperature sensing to adapt to hot/cold environments and prevent thermal runaway.

Use Value: Prevents premature termination in cold weather (via VLBAT validation) and avoids overtemperature faults in hot enclosures (via TS-based cutoff), improving operational uptime.

Power Tools

Emergency Lighting

Use Scenario: Charging subsystem in cordless drill/driver battery packs where high-current fast charge must coexist with strict safety margins.

IC Role / Device Role / Timing Role: Primary charge safety supervisor enforcing maximum voltage (2 V), time-limited fast charge (configurable via TM), and real-time temperature monitoring.

Use Value: Guarantees no cell exceeds safe voltage or temperature thresholds during aggressive C/2 or 1C charging, satisfying UL 2580 and IEC 62133 requirements.

Use Scenario: Standby battery charger in commercial emergency exit signs powered by AC mains with NiCd backup batteries.

IC Role / Device Role / Timing Role: Maintenance charger providing periodic pulse-trickle (C/32) to offset self-discharge while disabling fast charge unless battery voltage drops below 0.175 × VCC.

Use Value: Maintains battery readiness over years of standby with zero risk of overcharge or thermal stress, complying with NFPA 101 and EN 1838 luminance hold-time mandates.

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
BQ2002GSNTR	Different TM-programmed timing limits: 160 min fast-charge (vs. 200 min), 80 min top-off (vs. none for BQ2002ESNTR), identical -∆V/PVD thresholds and pinout.	Preferred for designs requiring shorter fast-charge windows or mandatory top-off phase; same PCB layout and bill-of-materials except TM resistor network.	Select BQ2002GSNTR when tighter charge-time control or guaranteed top-off is required; verify TM biasing matches Table 1 mid/high settings.
MAX713CPA+	5 V fixed supply only (no 4–6 V range); uses different termination algorithm (dV/dt + temperature); 16-pin PDIP/SOIC package - not pin-compatible.	Used in legacy industrial chargers; lacks synchronized sampling and PVD mode; requires external op-amps for precision voltage sensing.	Choose MAX713CPA+ only for drop-in replacement in existing 16-pin layouts; expect redesign effort for voltage reference, timing, and TS interface.

Compared with BQ2002ESNTR, BQ2002GSNTR offers tighter timing granularity and enabled top-off at the cost of reduced maximum fast-charge duration, while MAX713CPA+ demands board-level redesign due to differing pin count, supply constraints, and analog architecture - making BQ2002ESNTR optimal for new SOIC-based NiCd/NiMH charger designs prioritizing integration and ripple-immune termination.

Availability

BQ2002ESNTR is available at Aetrix Electronics and suitable for portable medical devices, two-way radios, power tools, and emergency lighting systems requiring stable component supply, long-lifecycle support, and RoHS-compliant SOIC packaging.

Supply support for BQ2002ESNTR 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 decades of expertise in battery management and precision analog IC design.

The BQ2002E/G series was designed specifically for cost-sensitive, standalone NiCd/NiMH fast-charge applications - delivering integrated termination, status indication, and safety monitoring in a single 8-pin IC without MCU dependency.

FAQ

What termination methods does the BQ2002ESNTR support for NiCd/NiMH fast charging?

The BQ2002ESNTR supports five independent fast-charge termination methods: negative delta voltage (-∆V) detection at −12 mV ±3 mV, peak voltage detection (PVD) at −2.5 mV ±2.5 mV, maximum cell voltage (2 V ±5%), maximum temperature (via TS pin voltage < 0.5 × VCC ±5%), and TM-configurable maximum time (40–200 min). All methods operate concurrently, and termination occurs upon the first condition met. This multi-layered approach ensures robust safety across varying battery chemistries and environmental conditions in the BQ2002ESNTR.

How does the TM pin configure BQ2002ESNTR behavior?

The TM pin is a three-level analog input that selects fast-charge time (40/80/200 min), top-off enablement and duration, PVD vs. -∆V termination mode, voltage hold-off period, and pulse-trickle rate. Mid-level (VCC/2 ±0.5 V) sets PVD mode and 200-min fast-charge limit for BQ2002ESNTR; low-level enables -∆V and 80-min limit; high-level selects 40-min limit and disables top-off. Resistor dividers between VCC and VSS generate the required voltage levels, and the BQ2002ESNTR interprets them without external logic.

Can BQ2002ESNTR be used for multi-cell NiMH battery packs?

Yes, the BQ2002ESNTR supports multi-cell NiMH packs through external resistor-divider networks on the BAT pin. For an N-cell pack, RB1/RB2 = N − 1 sets the divider ratio so that full-pack voltage maps to ≤2 V at BAT - maintaining validity for the 2 V ±5% maximum cell voltage check. Input impedance must be 200 kΩ–1 MΩ. The BQ2002ESNTR itself monitors per-cell-equivalent voltage, not total pack voltage, ensuring correct termination regardless of series count.

What is the function of the INH pin on BQ2002ESNTR?

The INH pin is an active-high charge inhibit input that suspends fast charge and top-off activity while preserving the internal timer state and allowing pulse-trickle to continue. When INH goes high, the BQ2002ESNTR freezes LED output and erases PVD/-∆V voltage history after >12 ms; returning INH low resumes charging from the suspended point. It also enables synchronized voltage sampling when pulsed (100 ns–3.5 ms), which is critical for rejecting AC ripple during termination decisions in the BQ2002ESNTR.

Does BQ2002ESNTR include built-in protection against reverse battery insertion?

No, the BQ2002ESNTR does not integrate reverse-polarity protection. Its BAT pin accepts 0–VCC input but lacks internal diode clamping or polarity-sensing circuitry. Reverse battery connection may damage external components or cause undefined behavior. System-level protection - such as a series Schottky diode or ideal diode controller on the battery input path - must be implemented externally to safeguard the BQ2002ESNTR and associated circuitry.

BQ2002ESNTR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Battery Chemistry:: Multi-Chemistry

Number of Cells:: -

Current - Charging:: Constant, Pulsed

Programmable Features:: Voltage

Fault Protection:: -

Charge Current - Max:: -

Battery Pack Voltage:: 2V

Voltage - Supply (Max):: 6V

Interface:: -

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

BQ2002ESNTR FAQ

1.How can I place an order for BQ2002ESNTR through Aetrix?

Please submit a Request for Quotation (RFQ) for BQ2002ESNTR 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 BQ2002ESNTR reliable?

The price and inventory of BQ2002ESNTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2002ESNTR is usually 5 days.

3.What payment methods are accepted for BQ2002ESNTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2002ESNTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BQ2002ESNTR?

BQ2002ESNTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BQ2002ESNTR 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 BQ2002ESNTR?

For technical support, including BQ2002ESNTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2002ESNTR requirements.

6.How does Aetrix verify that BQ2002ESNTR is sourced from the original manufacturer or authorized distributors?

All BQ2002ESNTR 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 BQ2002ESNTR meets industry standards.

7.What is the process for return or replacement of BQ2002ESNTR?

All BQ2002ESNTR units undergo pre-shipment inspection (PSI). If there is an issue with BQ2002ESNTR, 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 BQ2002ESNTR part is unused and in its original packaging.

Return procedure for BQ2002ESNTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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