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Texas Instruments BQ25887RGER
- Part No.:
- BQ25887RGER
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
BQ25887RGER.pdf
- Description:
- IC BAT BALANCER LI-ION 2C 24VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
BQ25887RGER from Texas Instruments is a 2-cell (2s) Li-ion battery charger IC with integrated boost-mode switching, I²C control, and active cell balancing. It delivers up to 2-A charge current from 3.9–6.2-V USB input, achieves ±0.5% voltage regulation and 93.4% efficiency at 1-A/7.6-V, and supports real-time monitoring via a 16-bit ADC for bus/battery voltage/current, cell voltages, temperature, and die temperature. It is designed for compact portable electronics requiring precise dual-cell management.
For engineers reviewing the BQ25887RGER datasheet, BQ25887RGER pinout, BQ25887RGER application, or BQ25887RGER equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters, and two rigorously cross-checked alternative parts for 2s Li-ion boost charging with cell balancing and I²C interface.
Technical Context
The BQ25887RGER implements a synchronous boost converter architecture operating at 1.35–1.65 MHz to charge two series-connected Li-ion cells from a single USB-compatible input. Its control loop integrates input voltage (VINDPM) and current (IINDPM) regulation, JEITA-compliant thermistor-based thermal qualification, and automatic cell balancing using internal FETs with up to 400 mA balancing current.
It embeds a 16-bit ADC with programmable sampling rates (3–24 ms per measurement) covering VBUS, IBUS, BAT, IBAT, MID (top/bottom cell), TS, and die temperature. All MOSFETs, current sensing, and loop compensation are integrated - eliminating external power-path components while maintaining ±5% charge current accuracy and ±7.5% input current regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Topology | Integrated synchronous boost-mode switcher for 2s Li-ion (7.2–8.4 V nominal) |
| Max Charge Current | 2.2 A - supports fast-charge profiles for high-capacity 2s packs in space-constrained designs |
| Input Voltage Range | 3.9–6.2 V - compatible with USB 2.0/3.0 adapters and USB PD 5-V profiles |
| Voltage Regulation Accuracy | ±0.5% - ensures cell-level voltage precision critical for longevity and safety compliance |
| Cell Balancing Current | Up to 400 mA - actively equalizes voltage mismatch between series cells without external circuitry |
| ADC Resolution | 16-bit effective - enables high-fidelity system telemetry for battery health estimation and fault diagnostics |
| Switching Frequency | 1.5 MHz typical - allows use of small 1-µH inductors and reduces EMI filtering requirements |
| Package | VQFN-24 (4.0 mm × 4.0 mm, 0.5-mm pitch) - thermally enhanced for high-power density layouts |
Pinout & Package
VQFN-24 package (4.0 mm × 4.0 mm, 0.5-mm pitch) with exposed thermal pad; RoHS-compliant, moisture-sensitive level 2a per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBUS | Power Input | Main DC input (3.9–6.2 V); supports input current limiting and voltage regulation |
| BAT | Battery Power | Connects to 2s battery stack anode/cathode; handles up to 2.2-A charge and 5-A RMS discharge |
| PMID | Blocking MOSFET Output | Post-regulation node; isolates VBUS from battery during shutdown or fault conditions |
| SW | Switch Node | High-frequency switching point for external inductor; rated for 13-V max transient |
| BTST | Bootstrap Supply | Drives high-side gate; requires 47-nF capacitor between BTST and SW |
| REGN | LDO Output | 4.8-V, 50-mA bias rail for internal drivers and logic; bypassed with 4.7-µF ceramic |
| SNS | Current Sense | Differential sense input for charge current; stability requires 44-µF ceramic capacitor |
| MID | Midpoint Monitor | Measures bottom-cell voltage in 2s configuration; enables cell balancing and individual cell ADC |
| CBSET | Cell Balance Control | Current-set pin for balancing FETs; resistor value determines balancing current (max 400 mA) |
| TS | Thermistor Interface | Analog input for NTC thermistor; enables JEITA-compliant charge enable/disable based on temperature zones |
| ILIM | Input Current Set | Analog pin setting IINDPM (500–3300 mA); 0.8-V reference enables resistor-based programming |
| PSEL | Source Selection | Digital input indicating USB host (HIGH = 500 mA) vs. adapter (LOW = 3.0 A) |
| SDA / SCL | I²C Interface | Standard bidirectional data/clock lines; support 1-MHz operation with 10-kΩ pull-ups |
| /INT / STAT / /PG | Status Outputs | Open-drain indicators: interrupt event, charge status, and input power-good (all require 10-kΩ pull-up) |
| CD | Chip Disable | Active-HIGH disable; places device in high-impedance mode while preserving I²C and ADC functionality |
| GND | Ground Reference | Two dedicated pins (19, 20) for low-impedance return path and thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Charger + Cell Balancer | Eliminates need for separate balancer IC or discrete FETs; reduces BOM count and PCB area by >30% |
| Input Current Optimizer (ICO) | Automatically adjusts VINDPM to maximize power extraction without overloading USB sources |
| 16-bit System Monitoring ADC | Simultaneously measures VBUS, IBUS, VBAT, IBAT, VMID (top/bottom cell), TS, and die temperature |
| JEITA Thermal Qualification | Five-zone thermistor comparator (0°C to 60°C) with hysteresis enables safe charging across environmental extremes |
| Automatic Cell Balancing | Configurable start/stop delta thresholds (80–190 mV start, 30–100 mV stop) prevent over-balancing and extend cycle life |
| High-Accuracy Regulation | ±0.5% VREG, ±5% ICHG, ±7.5% IINDPM - meets stringent safety and runtime requirements for premium portable devices |
Applications
| Electronic Toys | VR Headsets |
|---|---|
Use Scenario: Rechargeable robotic toys with dual-cell Li-ion packs requiring compact, safe, and autonomous charging. IC Role / Device Role: Primary 2s battery charger managing USB input, cell balancing, and thermal safety without host intervention. Use Value: Enables full-charge autonomy and extended runtime while preventing cell imbalance-induced capacity loss in consumer-grade toys. |
Use Scenario: Standalone VR headsets powered by slim 2s Li-ion batteries needing efficient 5-V USB charging and accurate state-of-charge telemetry. IC Role / Device Role: Integrated charger and monitor providing real-time cell voltage, temperature, and charge current to headset MCU via I²C. Use Value: Delivers precise battery health reporting and JEITA-compliant thermal throttling to maintain user comfort and battery longevity. |
| IP Network Cameras | Drone Payloads |
Use Scenario: Outdoor IP cameras with sealed 2s battery enclosures requiring robust, maintenance-free charging from PoE-derived 5-V supplies. IC Role / Device Role: USB-input boost charger with integrated cell balancing and wide-temp ADC for remote battery diagnostics. Use Value: Ensures consistent cell matching over years of field operation, reducing premature failure due to voltage drift in unattended deployments. |
Use Scenario: Modular drone payloads (e.g., gimbals, sensors) with space-limited 2s batteries needing rapid, safe recharge between flights. IC Role / Device Role: High-efficiency (93.4% @1A) boost charger with automatic balancing and fault reporting via /INT pin. Use Value: Cuts recharge time by enabling full 2.2-A charge while preventing overvoltage faults that could damage sensitive payload electronics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2s Li-ion boost charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ25883RGER | No cell balancing; identical pinout, same 2s boost topology and I²C interface | Suitable only where passive balancing or external balancers are acceptable | Select when cell balancing is unnecessary and cost reduction is prioritized over autonomous pack maintenance |
| BQ25886RGER | Higher VBUS min (4.3 V); no cell balancing; standalone (no I²C) control | Requires external microcontroller for configuration; lacks telemetry and adaptive regulation | Choose for fixed-function, low-software-overhead applications where USB-C 5-V input is guaranteed and telemetry is not required |
Compared with BQ25887RGER, BQ25883RGER removes balancing but retains full I²C configurability and telemetry, while BQ25886RGER trades both balancing and I²C for lower BOM cost and simpler firmware - making BQ25887RGER the sole option when autonomous cell matching and real-time system monitoring are mandatory.
Availability
BQ25887RGER is available at Aetrix Electronics and suitable for electronic toys, VR headsets, IP network cameras, and drone payload control requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for BQ25887RGER 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 high-reliability electronics.
The BQ25887RGER belongs to TI's Battery Management IC product line, engineered specifically for space-constrained, USB-powered portable devices requiring precise 2s Li-ion charging, cell balancing, and comprehensive system telemetry without external support components.
FAQ
What is the primary function of the BQ25887RGER?
The BQ25887RGER is a fully integrated 2-cell (2s) Li-ion battery charger IC with boost-mode switching, I²C control, and active cell balancing. It accepts 3.9–6.2-V USB input, delivers up to 2.2-A charge current, regulates cell voltage to ±0.5%, and monitors system parameters via a 16-bit ADC. The BQ25887RGER enables autonomous, safe, and efficient charging in compact portable electronics without external power-path components.
Does the BQ25887RGER support cell balancing, and how is it implemented?
Yes, the BQ25887RGER supports active cell balancing with up to 400 mA current using integrated FETs. Balancing is triggered when the voltage difference between top and bottom cells exceeds a programmable threshold (80–190 mV), and stops when the delta falls below a lower hysteresis threshold (30–100 mV). The CBSET pin sets balancing current via an external resistor, and MID pin provides mid-point voltage sensing essential for 2s configurations. This implementation is confirmed in the BQ25887RGER datasheet Section 8.3.
What are the key thermal management features of the BQ25887RGER?
The BQ25887RGER includes junction temperature regulation at 120°C, thermal shutdown at 150°C (with 120°C hysteresis), and JEITA-compliant thermistor-based qualification across five temperature zones (0°C to 60°C). The TS pin interfaces with an NTC thermistor, and internal comparators suspend charging outside safe ranges. Its VQFN-24 package has RΘJA = 32.4°C/W and RΘJB = 10.7°C/W, supporting reliable operation up to 85°C ambient. These features are specified in BQ25887RGER Sections 7.4 and 7.5.
Can the BQ25887RGER operate without I²C communication?
No - the BQ25887RGER requires I²C for configuration and control; it does not support standalone operation. Default register settings enable basic charging, but cell balancing, JEITA zones, ADC sampling, and fault response must be configured via I²C. The absence of a standalone mode distinguishes it from variants like BQ25886RGER. This dependency is explicitly stated in the BQ25887RGER datasheet Feature List and Section 8.4.
What is the role of the MID pin in the BQ25887RGER?
The MID pin on the BQ25887RGER connects to the interconnection point between the two series Li-ion cells, enabling direct measurement of the bottom-cell voltage (VMID) and facilitating active cell balancing. It serves as the reference for the internal ADC's cell-voltage monitoring and provides the feedback path for balancing FET control. A 300-Ω series resistor is recommended for reverse-plug protection. This function is defined in BQ25887RGER Pin Functions Table (Section 6) and Figure 1.
BQ25887RGER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Balancer
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 2
- Fault Protection:
- Over Current, Over Temperature, Over Voltage
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-VQFN (4x4)
BQ25887RGER FAQ
1.How can I place an order for BQ25887RGER through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ25887RGER 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 BQ25887RGER reliable?
The price and inventory of BQ25887RGER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ25887RGER is usually 5 days.
3.What payment methods are accepted for BQ25887RGER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ25887RGER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ25887RGER?
BQ25887RGER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ25887RGER 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 BQ25887RGER?
For technical support, including BQ25887RGER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ25887RGER requirements.
6.How does Aetrix verify that BQ25887RGER is sourced from the original manufacturer or authorized distributors?
All BQ25887RGER 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 BQ25887RGER meets industry standards.
7.What is the process for return or replacement of BQ25887RGER?
All BQ25887RGER units undergo pre-shipment inspection (PSI). If there is an issue with BQ25887RGER, 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 BQ25887RGER part is unused and in its original packaging.
Return procedure for BQ25887RGER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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