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Texas Instruments BQ24381DSGR
- Part No.:
- BQ24381DSGR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ24381DSGR.pdf
- Description:
- IC BATT PROTECTION LI-ION 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,663
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Product details
Overview
BQ24381DSGR from Texas Instruments is a front-end protection IC for Li-ion battery charging circuits, functioning as a 5-V linear regulator with integrated input overvoltage (7.1 V threshold), battery overvoltage (4.35 V), and thermal (140°C) protection. It delivers up to 1.7 A load current, features soft-start/soft-stop control, and provides open-drain FAULT signaling - deployed in mobile phones and low-power handheld devices.
For engineers reviewing the BQ24381DSGR datasheet, BQ24381DSGR pinout, BQ24381DSGR application, or BQ24381DSGR equivalent, this page delivers verified electrical parameters, WSON-8 package layout, fault-handling behavior under OVP/BVOVP/overtemperature events, and real-world implementation guidance for charger front-end safety design.
Technical Context
The BQ24381DSGR operates as a controlled linear pass device with internal N-channel FET, regulating output to 5.0 V ±0.2 V across 3.3–30 V input while continuously monitoring IN voltage, VBAT sense, and die temperature. Its protection logic triggers immediate FET shutdown on input overvoltage (>7.1 V), battery overvoltage (>4.35 V for >176 µs), or junction temperature >140°C.
It implements 8-step soft-start (625 µs/step) to limit inrush, soft-stop to suppress voltage spikes during fault shutdown, and start-up short-circuit detection with 1.5 A clamp and 64 ms retry interval. The CE pin enables host-controlled enable/disable with internal 200 kΩ pulldown, and FAULT provides active-low open-drain status reporting of all four fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Regulation Voltage | 5.0 V ±0.2 V - maintains stable 5-V supply to downstream charger ICs despite input variation up to 30 V. |
| Input Overvoltage Threshold | 7.1 V (typ) with 120 mV hysteresis - disconnects system within 200 ns when adapter fault exceeds safe level. |
| Battery Overvoltage Threshold | 4.35 V ±0.05 V - disables pass FET if sensed pack voltage exceeds safe Li-ion termination, with 320 mV hysteresis. |
| Max Continuous Load Current | 1.7 A - supports high-current portable applications without external current limiting components. |
| Thermal Shutdown Threshold | 140°C ±10°C - protects against PCB-level overheating; resumes operation only after cooling to ≤120°C. |
| Standby Current | 100 µA - enables ultra-low power state when CE = HIGH, critical for battery-backed always-on systems. |
| Dropout Voltage | 280 mV at 1 A - ensures regulation stability even with marginal input headroom (e.g., 5.28 V IN → 5.0 V OUT). |
Pinout & Package
Package: 2 mm × 2 mm, 8-pin WSON (DSG) with exposed thermal pad connected internally to VSS. Requires soldering thermal pad to PCB ground plane for thermal performance (RθJB = 33.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input power supply | Accepts 3.3–30 V DC; requires ≥1 µF ceramic bypass capacitor to suppress cable-induced transients. |
| VSS (Pin 2) | Ground reference | Primary ground connection; must be tied to PCB ground plane and thermal pad for thermal and noise integrity. |
| NC (Pins 3, 7) | No-connect terminal | Internally unused; must remain unconnected per TI design guidelines to avoid test-mode interference. |
| FAULT (Pin 4) | Open-drain fault indicator | Pulled low on OVP/BVOVP/overtemperature/startup short; requires external pull-up (1–50 kΩ) to host logic rail. |
| CE (Pin 5) | Active-low enable control | Drives internal pass FET ON when LOW; internal 200 kΩ pulldown allows direct GPIO interface or floating for always-on use. |
| VBAT (Pin 6) | Battery voltage sense input | Monitors pack voltage via 100 kΩ series resistor; isolates battery from IN during failure (max 30 V tolerance). |
| OUT (Pin 8) | Regulated output | Delivers 5.0 V to charging circuitry; requires ≥1 µF ceramic capacitor near pin for transient response and OVP clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Input overvoltage protection | 7.1 V threshold with 200 ns propagation delay and automatic recovery after 8 ms stabilization window. |
| Battery overvoltage lockout | 4.35 V detection with 176 µs deglitch time and soft-stop shutdown to prevent voltage spikes on battery line. |
| Soft-start / soft-stop sequencing | 8-step current ramp (625 µs/step) at power-on; gate-drive ramp-down during fault shutdown minimizes VOUT overshoot. |
| Start-up short-circuit detection | 1.5 A current clamp during soft-start; initiates 64 ms retry cycle if overload persists beyond 5 ms check window. |
| Thermal shutdown with hysteresis | 140°C trip point with 20°C hysteresis ensures reliable re-enabling only after sufficient die cooling (≤120°C). |
Applications
| Smartphone Charging Front-End | USB-Powered Portable Device |
|---|---|
Use Scenario: AC adapter supplies variable voltage (5–12 V) to smartphone charging IC; adapter failure may cause >6 V surge. IC Role / Device Role / Timing Role: Primary overvoltage guard between adapter and charger IC; responds within 200 ns to isolate system before damage occurs. Use Value: Prevents catastrophic failure of downstream PMIC and battery by cutting off unsafe input before it reaches charging circuitry. |
Use Scenario: Portable medical monitor powered via USB-C PD source; battery pack requires strict 4.2–4.35 V charge voltage window. IC Role / Device Role / Timing Role: Battery voltage supervisor that disables power path if pack voltage exceeds 4.35 V during charging or standby. Use Value: Eliminates risk of Li-ion overcharge and thermal runaway by enforcing hard 4.35 V cutoff with 320 mV hysteresis. |
| Low-Power Handheld Instrument | Industrial PDA with Hot-Swappable Battery |
Use Scenario: Field-deployed data logger uses wall adapter and Li-ion backup; ambient temperature can exceed 85°C during operation. IC Role / Device Role / Timing Role: Thermal watchdog that shuts down power path at 140°C junction temperature, then auto-restarts only after cooling to 120°C. Use Value: Enables safe operation in high-temp environments without requiring external thermal sensors or firmware intervention. |
Use Scenario: Rugged PDA supports hot-swap battery replacement; insertion causes transient inrush and potential voltage spike on VBAT line. IC Role / Device Role / Timing Role: Fault-aware power controller using CE pin to coordinate safe power sequencing during battery swap. Use Value: FAULT signal alerts host processor of unsafe conditions, enabling controlled suspend/resume instead of uncontrolled reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar front-end protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS259211DSGR | 2.7–18 V input, 5.15 V fixed output, no battery overvoltage monitoring; integrates precise current limiting (0.5–5 A). | Designed for general load-switch protection, not battery-specific safety; lacks VBAT sense and BVOVP function. | Select when primary need is programmable current limiting and fast OVP, but battery voltage supervision is handled elsewhere. |
| BQ24392DSGR | Same 7.1 V OVP and 4.35 V BVOVP thresholds, but adds integrated LDO mode (3.3 V/200 mA) and enhanced ESD (±8 kV HBM). | Targets space-constrained designs needing auxiliary regulated rail; higher cost and pin count (12-pin WQFN). | Choose when dual-rail output (5 V + 3.3 V) and higher ESD robustness are required, accepting larger footprint and complexity. |
Compared with TPS259211DSGR and BQ24392DSGR, the BQ24381DSGR offers optimal balance of dedicated Li-ion battery safety features (BVOVP, soft-stop), compact 2×2 mm WSON package, and minimal external component count - making it ideal for cost-sensitive, battery-critical portable applications where VBAT supervision is mandatory.
Availability
BQ24381DSGR is available at Aetrix Electronics and suitable for smartphone charging circuits, USB-powered portable devices, and low-power handheld instruments requiring stable component supply with full lifecycle support.
Supply support for BQ24381DSGR 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 specializing in analog and embedded processing technologies, with leadership in power management and battery-related ICs.
The BQ24381DSGR belongs to TI's bq2438x family of front-end protection ICs, designed specifically to safeguard Li-ion battery charging systems from adapter faults, overvoltage, overtemperature, and battery overcharge events.
FAQ
What is the exact input overvoltage protection threshold for BQ24381DSGR?
The BQ24381DSGR has a nominal input overvoltage protection (OVP) threshold of 7.1 V, with a minimum of 6.88 V and maximum of 7.31 V across temperature and process variation. This value is specific to the BQ24381DSGR variant and differs from the BQ24380 (6.3 V) and BQ24382 (10.5 V). The OVP hysteresis is 120 mV, ensuring stable re-enablement only after input drops to ≤6.98 V.
Does BQ24381DSGR support battery overvoltage protection, and how does it behave?
Yes, the BQ24381DSGR provides dedicated battery overvoltage protection (BVOVP) with a fixed 4.35 V threshold and 320 mV hysteresis. When VBAT exceeds 4.35 V for longer than 176 µs, the internal pass FET shuts down using soft-stop to prevent voltage spikes, and FAULT goes low. Power resumes only after VBAT falls to ≤4.03 V and the device completes its restart sequence.
What is the recommended external resistor value for the VBAT pin on BQ24381DSGR?
Texas Instruments recommends a 100 kΩ series resistor (RBAT) between the battery pack and the VBAT pin of the BQ24381DSGR. This limits fault current to <250 µA if IN voltage appears on VBAT due to internal failure, while introducing only ~1 mV sensing error - negligible versus the ±50 mV BVOVP tolerance. Values up to 470 kΩ are acceptable if tighter BVOVP accuracy is not required.
Can BQ24381DSGR operate without a microcontroller, and how is enable controlled?
Yes, the BQ24381DSGR can operate autonomously: its CE pin has an internal 200 kΩ pulldown resistor, so leaving CE unconnected or tying it to GND enables the device permanently. For host-controlled operation, drive CE LOW to activate the pass FET and HIGH to disable it. During CE = HIGH, FAULT is high-impedance and quiescent current drops to 100 µA.
What thermal performance can be expected from BQ24381DSGR in its WSON-8 package?
In the 2 mm × 2 mm WSON-8 (DSG) package, the BQ24381DSGR achieves a junction-to-board thermal resistance (RθJB) of 33.9°C/W when the exposed thermal pad is properly soldered to a solid PCB ground plane. With 1.7 A load and 280 mV dropout, power dissipation is ~476 mW - resulting in ~16°C junction rise above board temperature, well within the 125°C max operating range.
BQ24381DSGR 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, Short Circuit
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (2x2)
BQ24381DSGR FAQ
1.How can I place an order for BQ24381DSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24381DSGR 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 BQ24381DSGR reliable?
The price and inventory of BQ24381DSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24381DSGR is usually 5 days.
3.What payment methods are accepted for BQ24381DSGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24381DSGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24381DSGR?
BQ24381DSGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24381DSGR 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 BQ24381DSGR?
For technical support, including BQ24381DSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24381DSGR requirements.
6.How does Aetrix verify that BQ24381DSGR is sourced from the original manufacturer or authorized distributors?
All BQ24381DSGR 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 BQ24381DSGR meets industry standards.
7.What is the process for return or replacement of BQ24381DSGR?
All BQ24381DSGR units undergo pre-shipment inspection (PSI). If there is an issue with BQ24381DSGR, 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 BQ24381DSGR part is unused and in its original packaging.
Return procedure for BQ24381DSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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