My Inquiry
My Account
Texas Instruments BQ28400PWR
- Part No.:
- BQ28400PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ28400PWR.pdf
- Description:
- IC BATT GAS GAUGE LIION 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,830
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BQ28400PWR from Texas Instruments is a fully integrated 2-series Li-Ion battery gas gauge and protection IC with SMBus v1.1 interface, 16-bit integrating ADC for coulomb counting (±10 µV offset), dual 16-bit delta-sigma ADCs for cell voltage/temperature sensing (±20 mV cell voltage accuracy), and high-side P-channel FET drive for charge/discharge control - deployed in tablet PCs, netbooks, and slate devices requiring precise state-of-charge estimation under JEITA-compliant charging.
For engineers reviewing the BQ28400PWR datasheet, BQ28400PWR pinout, BQ28400PWR application, or BQ28400PWR equivalent, key selection considerations include its 20-pin TSSOP package, integrated CEDV gauging algorithm with self-discharge compensation, programmable overvoltage/undervoltage/short-circuit/overtemperature protection thresholds, SHA-1 authentication responder support, and zero-volt pre-charge capability for deeply discharged cells.
Technical Context
The BQ28400PWR implements a dual-ADC architecture: a high-resolution 16-bit integrating delta-sigma ADC for bidirectional current sensing across SRP/SRN (–0.20 V to +0.25 V range, 15-bit effective resolution), and a separate 16-bit delta-sigma ADC with 16-channel multiplexer for simultaneous cell voltage (VC1/VC2), pack voltage (BAT/PACK), and thermistor (TS1) measurements. It embeds a fast CPU executing Compensated End-of-Discharge Voltage (CEDV) gauging with temperature- and SOC-dependent self-discharge modeling.
Protection logic operates independently of host communication via dedicated analog comparators and configurable registers stored in on-chip flash memory. The device supports three power modes - Normal (1-second update interval), Sleep (wake-on-current or SMBus activity), and Shutdown (<1 µA quiescent current) - with internal clock synthesizer eliminating external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Configuration | 2-series Li-Ion or Li-Polymer battery packs - enables direct monitoring of individual cell voltages VC1 and VC2 for imbalance detection and JEITA compliance. |
| Coulomb Counting ADC | 16-bit integrating delta-sigma ADC with ±10 µV offset error - delivers high-accuracy charge/discharge integration across 5–20 mΩ sense resistors without external calibration. |
| Cell Voltage Accuracy | ±20 mV over –20°C to 85°C - ensures reliable overvoltage/undervoltage protection triggering at ±50 mV thresholds per cell. |
| Protection Response Time | t(SCDD) = 1830 µs max short-circuit discharge delay - provides rapid FET shutdown before thermal runaway in fault conditions. |
| Supply Current Modes | 400 µA (Normal), 55 µA (Low-Power), 0.5–1 µA (Shutdown) - extends battery pack shelf life and reduces parasitic drain during storage. |
| SMBus Interface | SMBus v1.1 slave mode, 10–100 kHz clock frequency - interoperates with standard SBS-compliant host controllers without protocol translation. |
| Flash Memory | 10-year data retention, 20k write cycles - stores user-programmable protection settings, calibration coefficients, and lifetime logging data non-volatilely. |
Pinout & Package
20-pin TSSOP (PW) RoHS-compliant package with exposed pad thermal path; 0.65 mm pitch, 6.5 mm × 4.4 mm body size; rated for –40°C to 85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT | Power input | Alternate supply input referenced to VSS; connects to most positive cell terminal in 2-series stack. |
| DSG | Digital output | P-channel discharge FET gate drive; actively pulls low to disable discharge path during overcurrent or short-circuit events. |
| VC1 | Analog input | Sense input for most positive cell; also drives external balancing FET via internal 3.7 kΩ pull-down when CB_EN active. |
| VC2 | Analog input | Sense input for lowest cell; also drives external balancing FET via internal 1.75 kΩ pull-down when CB_EN active. |
| SRP / SRN | Analog inputs | Differential coulomb counter inputs across sense resistor; support bidirectional current measurement from –0.20 V to +0.25 V. |
| CHG / ZVCHG | Digital outputs | P-channel charge FET gate drive (CHG) and pre-charge FET gate drive (ZVCHG); enable controlled charging of deeply discharged cells. |
| FUSE | Digital output | Push-pull fuse circuit drive; asserts permanent open-circuit condition upon safety-level faults (e.g., safety overvoltage). |
| SMBD / SMBC | I/O bidirectional | SBS data and clock lines; compliant with SMBus v1.1 electrical specifications including 600–1300 kΩ internal pull-downs. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CEDV Gauging | Compensates for temperature, SOC, and self-discharge in real time - delivers <3% state-of-charge error across full operating range without periodic full-charge recalibration. |
| Programmable Protection | Independent configuration of OV/UV/SC/OT/CIM thresholds via flash registers - enables custom safety margins aligned with specific cell chemistry and pack design. |
| SHA-1 Authentication Responder | Verifies pack authenticity using challenge-response protocol - prevents counterfeit battery insertion in OEM systems requiring secure supply chain validation. |
| Zero-Volt Pre-Charge Mode | Enables safe recovery of cells discharged below 2.0 V via ZVCHG-controlled current-limited pre-charge - avoids lithium plating damage during initial recharge. |
| RAM Backup via RBI Pin | Supports 0.1 µF capacitor hold-up for internal SRAM during momentary power loss - preserves runtime state and prevents gauging discontinuity during hot-swap events. |
Applications
| Tablet PC Battery Management | Netbook Smart Battery Pack |
|---|---|
Use Scenario: Real-time SoC reporting and JEITA-compliant charging control in 7–10 inch Android/iOS tablets with dual-cell Li-Polymer packs. IC Role / Device Role / Timing Role: Primary gas gauge and protection controller; performs 1-second CEDV updates and sub-millisecond fault response via autonomous analog comparators. Use Value: Enables accurate battery runtime prediction and prevents thermal excursions during fast charging by enforcing voltage/temperature limits per JEITA standard. |
Use Scenario: Integrated battery management in fanless x86 netbooks with 2S Li-Ion packs requiring SBS-compliant SMBus communication with BIOS. IC Role / Device Role / Timing Role: SMBus slave device providing standardized battery status (Voltage, Current, Temperature, RemainingCapacity) per SBS spec v1.1. Use Value: Eliminates need for discrete protection IC + separate fuel gauge, reducing BOM count and PCB area while ensuring OS-level battery health visibility. |
| Slate PC Power Safety System | Smartbook Energy Control Unit |
Use Scenario: High-reliability battery supervision in ruggedized slate PCs used in field service applications with wide ambient temperature exposure. IC Role / Device Role / Timing Role: Dual-role monitor: analog hardware protection layer (OV/UV/SC/OT) plus digital gauging engine with flash-stored calibration data. Use Value: Maintains functional safety integrity down to –20°C and up to 85°C ambient, with shutdown mode limiting leakage to <1 µA during extended storage. |
Use Scenario: Energy-aware battery control in ARM-based smartbooks where runtime optimization depends on precise self-discharge modeling. IC Role / Device Role / Timing Role: CEDV algorithm host with built-in self-discharge estimator updated hourly - corrects capacity drift caused by temperature-dependent parasitic losses. Use Value: Reduces reported SoC error by >40% after 30-day shelf life compared to uncompensated coulomb counters, improving user confidence in standby estimates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery gas gauge and protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ28Z610RSMR | 4–6 series support, integrated 3.3 V LDO, enhanced SHA-256 security, 12-bit ADC resolution for current sensing | Targets higher-cell-count laptop and power tool packs requiring wider voltage range and stronger cryptographic authentication | Select for new designs needing >2S scalability or NIST-compliant security; not drop-in due to different pinout and register map |
| BQ28550RGER | 2S-only like BQ28400PWR but adds integrated 2.7 V LDO, improved cell voltage accuracy (±10 mV), and extended temperature range (–40°C to 105°C) | Designed for automotive-grade portable medical and industrial equipment requiring AEC-Q200 alignment | Prefer when extended temp range or integrated LDO simplifies power tree; shares SMBus command set but requires firmware adaptation for new protection registers |
Compared with BQ28Z610RSMR and BQ28550RGER, the BQ28400PWR offers lower system cost and simpler layout for 2S consumer tablet/netbook applications, trading off advanced security and extended temperature rating for proven JEITA compliance and minimal external component count.
Availability
BQ28400PWR is available at Aetrix Electronics and suitable for tablet PCs, netbooks, and slate devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for BQ28400PWR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The BQ28400PWR belongs to TI's battery management IC product line, engineered specifically for compact, cost-sensitive 2-series Li-Ion smart battery packs in mobile computing applications where integration, accuracy, and JEITA compliance are critical.
FAQ
What is the primary function of the BQ28400PWR in a battery pack?
The BQ28400PWR serves as a fully integrated gas gauge and protection IC for 2-series Li-Ion/Li-Polymer battery packs. It performs coulomb counting via dual ADCs, executes CEDV-based state-of-charge estimation, monitors cell voltages and temperature, and controls charge/discharge FETs using programmable protection thresholds - all within a single 20-pin TSSOP package.
Does the BQ28400PWR support SMBus communication with standard host controllers?
Yes, the BQ28400PWR implements SMBus v1.1 in slave mode and is fully compliant with Smart Battery System (SBS) specification commands. It responds to standard SBS registers including Temperature (0x08), Voltage (0x09), Current (0x0a), RemainingCapacity (0x0f), and BatteryStatus (0x16), enabling plug-and-play integration with BIOS and embedded host processors.
How does the BQ28400PWR handle deeply discharged batteries?
The BQ28400PWR supports zero-volt pre-charge mode via the ZVCHG pin, allowing safe recovery of cells discharged below 2.0 V. When enabled, it applies controlled current through an external pre-charge FET until cell voltage rises above the minimum threshold, preventing lithium plating and enabling subsequent normal charging - a feature explicitly implemented in the BQ28400PWR's protection firmware.
What protection features are configurable in the BQ28400PWR?
The BQ28400PWR provides user-programmable protection including overvoltage (OV), undervoltage (UV), short circuit (SC), overtemperature (OT), and cell imbalance (CIM) detection. Thresholds and delays (e.g., t(SCDD) = 0–1830 µs) are stored in on-chip flash memory and can be adjusted via SMBus writes to dedicated configuration registers without hardware changes.
Is external calibration required for accurate gauging with the BQ28400PWR?
No, the BQ28400PWR undergoes factory calibration for voltage measurement accuracy (±20 mV over –20°C to 85°C) and includes offset/gain correction in firmware. While high-precision applications may benefit from end-of-line current-sense resistor calibration, the BQ28400PWR delivers usable SoC accuracy out-of-box using its integrated CEDV algorithm and self-discharge compensation - no mandatory external calibration is needed for typical tablet/netbook use cases.
BQ28400PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Multi-Function Controller
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 2
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage, Short Circuit
- Interface:
- SMBus
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
BQ28400PWR FAQ
1.How can I place an order for BQ28400PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ28400PWR 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 BQ28400PWR reliable?
The price and inventory of BQ28400PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ28400PWR is usually 5 days.
3.What payment methods are accepted for BQ28400PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ28400PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ28400PWR?
BQ28400PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ28400PWR 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 BQ28400PWR?
For technical support, including BQ28400PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ28400PWR requirements.
6.How does Aetrix verify that BQ28400PWR is sourced from the original manufacturer or authorized distributors?
All BQ28400PWR 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 BQ28400PWR meets industry standards.
7.What is the process for return or replacement of BQ28400PWR?
All BQ28400PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ28400PWR, 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 BQ28400PWR part is unused and in its original packaging.
Return procedure for BQ28400PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ28400PWR Tags
-
BQ29700DSER
Texas Instruments
-
S-8241ABKMC-GBKT2G
ABLIC Inc.
-
S-8241ABPMC-GBPT2G
ABLIC Inc.
-
BQ27427YZFR
Texas Instruments
-
BQ27426YZFR
Texas Instruments
-
STC3117IJT
STMicroelectronics
-
STC3115IJT
STMicroelectronics
-
BQ76925RGER
Texas Instruments
-
NPM1100-QDAA-R
Nordic Semiconductor ASA
-
BQ27441DRZR-G1A
Texas Instruments
-
STC3115AIQT
STMicroelectronics
-
S-8252AAL-M6T1U
ABLIC Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
