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Texas Instruments BQ24381DSGT
- Part No.:
- BQ24381DSGT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ24381DSGT.pdf
- Description:
- IC BATT PROTECTION LI-ION 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:470
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Product details
Overview
BQ24381DSGT from Texas Instruments is a front-end protection IC for Li-ion battery charging circuits, integrating input overvoltage protection (OVP), battery overvoltage protection (BVOVP), output short-circuit detection at startup, thermal shutdown, and 5-V regulated output with soft-start/soft-stop control. It operates as a linear pass device with up to 1.7-A load current, 7.1-V OVP threshold, and 4.35-V BVOVP threshold - deployed in mobile phones and low-power handheld devices.
For engineers reviewing the BQ24381DSGT datasheet, BQ24381DSGT pinout, BQ24381DSGT application, or BQ24381DSGT equivalent, this page delivers verified electrical parameters, functional mode behavior, fault status signaling logic, WSON-8 package layout guidance, and real-world implementation constraints including RBAT resistor selection and FAULT open-drain pull-up requirements.
Technical Context
The BQ24381DSGT functions as a voltage-regulated, current-limited linear pass switch with integrated monitoring circuitry. It continuously samples IN voltage (for OVP at 7.1 V), VBAT (for BVOVP at 4.35 V), die temperature (shut down at 140°C), and output current during startup (short-circuit detection at 1.5 A). Its operation includes deglitch timers (tDGL(BVovp) = 176 µs, tREC(OVP) = 8 ms) and soft-start sequencing (8 steps × 625 µs).
Control is implemented via active-low CE enabling the internal N-channel pass FET, while FAULT provides open-drain fault indication for OVP, BVOVP, overtemperature, or startup short-circuit events. The device enters POWER-DOWN mode below 2.8-V UVLO and performs power-on reset with tDGL(PGOOD) = 8-ms stabilization delay before enabling regulation.
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 variations up to 7.1 V. |
| Input Overvoltage Threshold | 7.1 V (typical), with 120-mV hysteresis - disconnects IN from OUT within 200 ns when adapter voltage exceeds safe limit. |
| Battery Overvoltage Threshold | 4.35 V ±50 mV - disables pass FET if sensed pack voltage exceeds safe Li-ion upper limit, re-enabling at 4.03–4.15 V. |
| Max Continuous Load Current | 1.7 A - supports high-current charging paths without external current-sense amplifiers or MOSFET drivers. |
| Startup Short-Circuit Detection | 1.5 A threshold with 5-ms check window - prevents latch-up during hot-plug into faulty loads using controlled soft-stop. |
| Thermal Shutdown | 140°C ±10°C with 20°C hysteresis - protects silicon integrity under sustained overload or poor PCB thermal design. |
| Enable Input Logic | Active-low CE with 0.4-V VIL, 1.4-V VIH, and internal 200-kΩ pulldown - allows direct GPIO control or permanent enable via ground tie. |
Pinout & Package
Package: 2 mm × 2 mm, 8-pin WSON (DSG) with exposed thermal pad connected internally to VSS. Requires solder paste stencil aperture matching TI's recommended land pattern and thermal pad grounding to system GND plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input power rail | Accepts 3.3–30 V DC; requires ≥1-µF ceramic bypass capacitor placed adjacent to pin to suppress cable inductance spikes. |
| VSS (Pin 2) | Ground reference | Primary return path for all currents; must be connected to PCB ground plane and thermal pad - not optional. |
| NC (Pins 3, 7) | No-connect terminal | Internally reserved; must remain unconnected on PCB - no routing or copper pour allowed. |
| FAULT (Pin 4) | Open-drain fault indicator | Pulled low during OVP/BVOVP/overtemp/startup SC; requires external 1–50-kΩ pull-up to logic rail for host MCU interrupt. |
| CE (Pin 5) | Chip enable control | Active-low enable; internal 200-kΩ pulldown permits default ON operation when left floating or tied to GND. |
| VBAT (Pin 6) | Battery voltage sense | High-impedance input (10 nA bias); must connect through 100-kΩ resistor to pack+ to prevent hazardous fault coupling. |
| OUT (Pin 8) | Regulated output | Delivers 5-V, ≤1.7-A power to charging circuit; requires ≥1-µF ceramic decoupling capacitor near pin to limit transient overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Input overvoltage protection | 7.1-V threshold with 200-ns response and automatic recovery after 8-ms deglitch - eliminates need for external TVS diodes in 5-V adapter systems. |
| Battery overvoltage lockout | 4.35-V precision sensing with 176-µs deglitch and soft-stop disable - prevents Li-ion cell overcharge without external voltage monitors. |
| Soft-start/soft-stop sequencing | 8-step current ramp (625 µs/step) at power-on; gradual gate discharge during fault - avoids input voltage spikes from adapter cable inductance. |
| Thermal shutdown with hysteresis | 140°C trip point + 20°C hysteresis ensures reliable recovery without oscillation under marginal thermal conditions. |
| Integrated fault status reporting | Single open-drain FAULT pin signals four distinct failure modes - reduces host GPIO count and simplifies firmware fault decoding. |
Applications
| Smartphone Charging Protection | Portable Medical Device Power Path |
|---|---|
|
Use Scenario: AC adapter supplies power to a smartphone's battery charging IC, where faulty adapters may deliver >6 V or cause battery overvoltage during charge termination failure. IC Role / Device Role / Timing Role: Front-end protector that isolates downstream charger IC from unsafe input or battery conditions, asserting FAULT within 200 ns of OVP detection. Use Value: Prevents catastrophic Li-ion cell damage or fire hazard by cutting off power before battery voltage exceeds 4.4 V or adapter surges exceed 7.3 V. |
Use Scenario: Portable blood glucose meter uses USB-powered charging but must guarantee zero risk of battery overvoltage due to regulatory safety requirements. IC Role / Device Role / Timing Role: Safety-critical power path supervisor that independently validates battery voltage prior to enabling charge controller, with 176-µs BVOVP response. Use Value: Enables IEC 62304 Class C compliance by providing hardware-enforced battery voltage ceiling independent of firmware execution. |
| MP3 Player Adapter Interface | Industrial Handheld Scanner Power Management |
|
Use Scenario: Consumer MP3 player accepts multiple third-party wall adapters, some delivering unstable or out-of-spec voltages during plug-in transients. IC Role / Device Role / Timing Role: Input conditioner that regulates 5-V output and blocks overvoltage events before they reach sensitive analog audio circuitry. Use Value: Eliminates need for redundant input filtering and enables use of cost-optimized, non-certified adapters without compromising audio subsystem reliability. |
Use Scenario: Ruggedized barcode scanner operates in warehouses with shared docking stations; repeated hot-plug cycles risk short-circuit faults at power-on. IC Role / Device Role / Timing Role: Startup protector that enforces 1.5-A current limit during soft-start and initiates 64-ms retry cycle upon short detection. Use Value: Guarantees robust field operation by preventing latch-up during frequent dock/undock sequences without requiring host MCU intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar front-end protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24380DSGT | 5.5-V output regulation (vs. 5.0 V), 6.3-V OVP threshold, identical pinout and BVOVP | Targeted for legacy 5.5-V charging architectures; not drop-in for 5-V systems requiring tight regulation | Select only if system requires 5.5-V output and adapter OVP margin below 7.1 V is acceptable |
| BQ24382DSGT | Same 5.0-V output and 10.5-V OVP threshold; higher OVP tolerance trades off lower sensitivity to transient surges | Suitable for industrial adapters with wider voltage tolerances; less responsive to fast 7–8 V spikes than BQ24381DSGT | Prefer when operating with unregulated 9–12 V inputs where 7.1-V OVP would cause nuisance trips |
Compared with BQ24380DSGT and BQ24382DSGT, the BQ24381DSGT offers optimal balance between 5-V compatibility and responsive 7.1-V OVP for consumer-grade USB-adjacent power sources - making it the default choice for smartphones, wearables, and portable audio where precise 5-V regulation and fast surge rejection are jointly required.
Availability
BQ24381DSGT is available at Aetrix Electronics and suitable for smartphone charging protection, portable medical device power path supervision, MP3 player adapter interface conditioning, and industrial handheld scanner power management requiring stable component supply across production lifecycles.
Supply support for BQ24381DSGT 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 ICs for battery-powered systems.
The BQ24381DSGT belongs to TI's bq2438x family of front-end protection ICs, designed specifically to safeguard Li-ion battery charging circuits against input overvoltage, battery overvoltage, thermal runaway, and startup short-circuits in space-constrained portable electronics.
FAQ
What is the exact output regulation voltage of the BQ24381DSGT?
The BQ24381DSGT regulates its OUT pin to 5.0 V ±0.2 V under nominal conditions (TJ = 25°C, IOUT = 0–1 A). This value is confirmed in Section 6.5 of the SLUS805C datasheet, where VO(REG) is specified as 4.8 V (min), 5.0 V (typ), and 5.2 V (max) across –40°C to 125°C junction temperature. The BQ24381DSGT does not support adjustable output - it is fixed at 5.0 V, unlike the BQ24380DSGT (5.5 V) or BQ24382DSGT (5.0 V with higher OVP).
How does the BQ24381DSGT respond to an input overvoltage event?
When IN voltage exceeds 7.1 V (typical), the BQ24381DSGT turns off its internal pass FET within 200 ns, isolating OUT from IN. FAULT is pulled low immediately, and the device remains latched off until IN falls below 6.98 V (7.1 V – 120 mV hysteresis). After stabilization, it automatically recovers after an 8-ms deglitch period (tREC(OVP)). This behavior is documented in Sections 7.3.1 and 6.5 of the SLUS805C datasheet and validated in Figure 13 (OVP response for input step).
Can the BQ24381DSGT be used without connecting the VBAT pin?
No - the VBAT pin must be connected either through a 100-kΩ resistor to the battery positive terminal (required for BVOVP functionality) or directly to VSS (if battery overvoltage protection is intentionally disabled). Leaving VBAT floating violates absolute maximum ratings and risks incorrect BVOVP triggering or damage. Section 8.2.2.1 of SLUS805C explicitly warns against direct VBAT-to-pack connections and mandates RBAT ≥100 kΩ for safety; the BQ24381DSGT relies on this node for critical 4.35-V threshold monitoring.
What is the maximum continuous output current rating for the BQ24381DSGT?
The BQ24381DSGT supports up to 1.7 A of continuous output current at the OUT pin, as specified in Section 6.3 (Recommended Operating Conditions) and confirmed in Figure 3 (Dropout Voltage vs Temperature) of the SLUS805C datasheet. This rating assumes proper PCB thermal design: 2-layer board with 1-in² copper pour on top/bottom layers and full thermal pad soldering. Derating applies above 85°C ambient; at 125°C junction temperature, max current drops to ~1.2 A per thermal calculations using RθJA = 64°C/W.
Is the BQ24381DSGT pin-compatible with other devices in the bq2438x family?
Yes - the BQ24381DSGT shares identical 8-pin WSON (DSG) package, pinout, and footprint with BQ24380DSGT and BQ24382DSGT, as confirmed in Section "Device Information" and Pin Configuration diagrams of SLUS805C. All three variants use the same IN/VSS/NC/FAULT/CE/VBAT/NC/OUT arrangement. However, functional differences (OVP threshold, output voltage) mean PCB-level substitution requires validation of system-level voltage margins and fault response timing - it is mechanically compatible but not functionally interchangeable without design review.
BQ24381DSGT 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)
BQ24381DSGT FAQ
1.How can I place an order for BQ24381DSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24381DSGT 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 BQ24381DSGT reliable?
The price and inventory of BQ24381DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24381DSGT is usually 5 days.
3.What payment methods are accepted for BQ24381DSGT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24381DSGT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24381DSGT?
BQ24381DSGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24381DSGT 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 BQ24381DSGT?
For technical support, including BQ24381DSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24381DSGT requirements.
6.How does Aetrix verify that BQ24381DSGT is sourced from the original manufacturer or authorized distributors?
All BQ24381DSGT 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 BQ24381DSGT meets industry standards.
7.What is the process for return or replacement of BQ24381DSGT?
All BQ24381DSGT units undergo pre-shipment inspection (PSI). If there is an issue with BQ24381DSGT, 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 BQ24381DSGT part is unused and in its original packaging.
Return procedure for BQ24381DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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