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Texas Instruments BQ24305DSGR
- Part No.:
- BQ24305DSGR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ24305DSGR.pdf
- Description:
- IC BATT PROTECTION LI-ION 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,981
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Product details
Overview
BQ24305DSGR from Texas Instruments is a Li-ion battery front-end protection IC that functions as a programmable linear regulator with integrated overvoltage, overcurrent, and battery overvoltage protection. It delivers 5.0 V regulated output at up to 250 mA, features 10.5 V input overvoltage threshold, 300 mA input current limit, and operates across 3.3–26 V input range for AC adapter-powered portable systems.
For engineers reviewing the BQ24305DSGR datasheet, BQ24305DSGR pinout, BQ24305DSGR application, or BQ24305DSGR equivalent, this device serves as a critical safety guard between unregulated DC input and downstream Li-ion charging circuitry-requiring precise knowledge of its OVP blanking time (64 μs), thermal shutdown (150 °C), CE logic thresholds, and PGATE gate-drive behavior under reverse-polarity conditions.
Technical Context
The BQ24305DSGR implements three independent protection loops: input overvoltage detection with 10.5 V threshold and 100 mV hysteresis, input overcurrent limiting at 300 mA with 5 ms blanking, and battery overvoltage cutoff at 4.35 V with 275 mV hysteresis. All protections trigger soft-stop gate control to suppress voltage transients.
It operates in LDO mode with 5.0 V regulation (±150 mV), 75 mV dropout at 250 mA, and integrates UVLO (2.7 V), thermal shutdown (150 °C), and enable-controlled power gating via active-low CE pin. The PGATE driver supports external P-FET for optional reverse-polarity protection up to –30 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Regulation Voltage | 5.0 V ±150 mV - maintains stable 5 V supply to charger IC even during input fluctuations within operating range. |
| Input Overvoltage Threshold | 10.5 V ±300 mV - triggers protection if adapter voltage exceeds safe level; includes 100 mV hysteresis to reject noise. |
| Input Current Limit | 300 mA typical - limits fault current into downstream circuitry; blanked for 5 ms before shutdown. |
| Battery Overvoltage Threshold | 4.35 V ±50 mV - disconnects system when Li-ion cell voltage exceeds safe charge termination point. |
| Dropout Voltage | 75 mV at 250 mA - enables low-loss regulation from inputs as low as 5.075 V while sustaining full load. |
| Operating Input Range | 3.3 V to 26 V - supports wide-input AC adapters and USB PD sources without external pre-regulation. |
| Junction Temperature Limit | 150 °C with 20 °C hysteresis - shuts down during thermal overload and auto-recovers only after die cools to 130 °C. |
Pinout & Package
Package: 2 mm × 2 mm, 8-pin WSON (DSG) with exposed thermal pad connected to VSS. Requires JEDEC High-K board layout with 2×3 thermal via array under PowerPAD™ for RθJA = 75 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input power supply | Accepts 3.3–26 V DC; requires ≥0.1 μF ceramic bypass capacitor to VSS for stability and transient immunity. |
| VSS (Pin 2) | Ground reference | Primary ground return; electrically tied to exposed thermal pad-must be connected to PCB ground plane. |
| PGATE (Pin 3) | P-FET gate driver | Drives external P-channel MOSFET for reverse-polarity protection; clamped to VIN – 15 V above 17 V input. |
| NC (Pins 4 & 7) | No-connect | Internally used for test; must remain unconnected in application circuits per TI design guidance. |
| CE (Pin 5) | Chip enable input | Active-low logic control; internal 200 kΩ pull-down allows floating for always-on operation. |
| VBAT (Pin 6) | Battery voltage sense | Monitors Li-ion pack voltage via high-impedance input (10 nA bias); requires 100–470 kΩ series resistor for safety. |
| OUT (Pin 8) | Regulated output | Delivers 5.0 V to downstream charger IC; requires ≥1 μF ceramic capacitor to VSS for OVP response and decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-protection architecture | Simultaneous monitoring of input voltage, input current, and battery voltage with independent fault responses. |
| Soft-start and soft-stop control | Gradual FET turn-on minimizes inrush-induced ringing; controlled gate ramp-down prevents voltage spikes during OCP/OVP events. |
| High-immunity deglitch timing | 8 ms power-on deglitch (tDGL(PGOOD)), 64 μs OVP blanking, and 176 μs BOVP deglitch reject ESD and cable-transient false triggers. |
| Optional reverse-polarity protection | PGATE output enables external P-FET to block –30 V input faults-no additional controller or discrete components required. |
| Low quiescent current | 410–500 μA operating current and 65–95 μA standby current extend battery-backed system runtime during idle states. |
Applications
| USB-Powered Portable Charger | Bluetooth Headset Charging Module |
|---|---|
|
Use Scenario: A compact Bluetooth headset uses a single-cell Li-ion battery charged via micro-USB port with variable adapter voltages (5–12 V). IC Role / Device Role / Timing Role: BQ24305DSGR acts as front-end protector-regulating input to 5.0 V, blocking >10.5 V surges, limiting inrush, and halting charge if battery reaches 4.35 V. Use Value: Prevents thermal runaway and charger IC damage during adapter hot-plug, cable-induced transients, or faulty battery cells. |
Use Scenario: Low-power wearable audio device with integrated linear charger and tight PCB space constraints. IC Role / Device Role / Timing Role: BQ24305DSGR provides fail-safe interface between USB input and bq24080 charger IC-enabling robust 5 V rail generation with minimal external components. Use Value: Eliminates need for discrete TVS, current-sense resistors, and comparator-based protection-reducing BOM count by 4+ parts. |
| Industrial Handheld Scanner | Medical Point-of-Care Monitor |
|
Use Scenario: Rugged handheld scanner powered by AC adapter in field environments where input voltage spikes and polarity reversal are common. IC Role / Device Role / Timing Role: BQ24305DSGR guards against 12 V adapter overvoltage, 300 mA short-circuit faults, and reverse-connection attempts using external P-FET driven by PGATE. Use Value: Enables certified Class I/II medical-grade reliability without redesigning power path-meeting IEC 61000-4-2 Level 4 (8 kV contact discharge) immunity. |
Use Scenario: Battery-backed patient monitor requiring uninterrupted operation and strict Li-ion safety compliance per UL 2054. IC Role / Device Role / Timing Role: BQ24305DSGR enforces hard battery overvoltage cutoff at 4.35 V with 275 mV hysteresis-preventing overcharge during extended AC operation. Use Value: Provides independently verified, hardware-level battery protection that remains active even if host MCU fails or freezes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion front-end protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| bq24304DSGR | 4.5 V output regulation (vs. 5.0 V); identical OVP/OCP/BOVP thresholds and timing. | Requires downstream 4.5 V–compatible charger IC; unsuitable for 5 V nominal systems. | Select only when system architecture mandates 4.5 V intermediate rail and all other specs align. |
| bq24300DSGR | 5.5 V output regulation (vs. 5.0 V); same protection thresholds but higher dropout voltage (100 mV typ at 250 mA). | Suitable for legacy 5.5 V charger inputs; less efficient at low VIN due to higher dropout. | Prefer for backward compatibility with existing 5.5 V designs; avoid if optimizing for low-input efficiency. |
Compared with bq24304DSGR and bq24300DSGR, the BQ24305DSGR offers optimal balance for modern 5.0 V USB-charged systems-delivering tighter regulation tolerance (±150 mV), lower dropout (75 mV), and direct compatibility with industry-standard 5 V charger ICs like bq2407x and bq25120.
Availability
BQ24305DSGR is available at Aetrix Electronics and suitable for USB-powered portable chargers, Bluetooth headsets, industrial handheld scanners, and medical point-of-care monitors requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for BQ24305DSGR 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, embedded processing, and connectivity solutions with emphasis on reliability, precision, and power efficiency across industrial, automotive, and personal electronics markets.
The bq2430x family was designed specifically for Li-ion battery safety in space-constrained portable devices-integrating triple-protection monitoring, LDO regulation, and gate-driver functionality into a thermally enhanced 2 mm × 2 mm package.
FAQ
What is the exact output regulation voltage of the BQ24305DSGR?
The BQ24305DSGR delivers a nominal 5.0 V output with a tolerance of ±150 mV (4.85 V to 5.15 V) under recommended operating conditions (VIN = 6 V, IOUT = 250 mA, TJ = 0–125 °C). This value is factory-trimmed and specified in the Electrical Characteristics table of the SLUS764C datasheet.
Does the BQ24305DSGR support reverse-polarity protection?
Yes-the BQ24305DSGR supports optional reverse-polarity protection up to –30 V when used with an external P-channel MOSFET. The PGATE pin drives the FET gate, and the internal clamp limits VGS to –15 V maximum, enabling robust input fault handling without additional controllers.
What is the purpose of the VBAT pin on the BQ24305DSGR?
The VBAT pin on the BQ24305DSGR senses battery voltage for battery overvoltage protection (BVOVP) at 4.35 V. It must be connected through a 100–470 kΩ resistor (RBAT) to the Li-ion pack positive terminal to prevent hazardous current injection during IC failure-never connect directly.
How does the BQ24305DSGR respond to an input overvoltage event?
When input voltage exceeds 10.5 V, the BQ24305DSGR initiates a 64 μs blanking window. If the overvoltage persists beyond this time, it executes a soft-stop gate turn-off-ramping down PGATE to suppress transients-then disables OUT. Recovery requires VIN to fall below 10.5 V and wait 8 ms before soft-start re-enables output.
Is the BQ24305DSGR pin-compatible with other bq2430x variants?
Yes-the BQ24305DSGR shares identical 8-pin WSON (DSG) package, pinout, and footprint with bq24300DSGR and bq24304DSGR. Only the output regulation voltage differs (5.5 V / 4.5 V / 5.0 V), making them drop-in replacements where regulation voltage matches system requirements.
BQ24305DSGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- -
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage
- Interface:
- -
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (2x2)
BQ24305DSGR FAQ
1.How can I place an order for BQ24305DSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24305DSGR 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 BQ24305DSGR reliable?
The price and inventory of BQ24305DSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24305DSGR is usually 5 days.
3.What payment methods are accepted for BQ24305DSGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24305DSGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24305DSGR?
BQ24305DSGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24305DSGR 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 BQ24305DSGR?
For technical support, including BQ24305DSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24305DSGR requirements.
6.How does Aetrix verify that BQ24305DSGR is sourced from the original manufacturer or authorized distributors?
All BQ24305DSGR 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 BQ24305DSGR meets industry standards.
7.What is the process for return or replacement of BQ24305DSGR?
All BQ24305DSGR units undergo pre-shipment inspection (PSI). If there is an issue with BQ24305DSGR, 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 BQ24305DSGR part is unused and in its original packaging.
Return procedure for BQ24305DSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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