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Texas Instruments BQ24316DSJT
- Part No.:
- BQ24316DSJT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
BQ24316DSJT.pdf
- Description:
- IC BATT PROTECTION LI-ION 12VSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,324
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Product details
Overview
BQ24316DSJT from Texas Instruments is a Li-ion battery front-end protection IC that monitors input overvoltage, user-programmable input overcurrent, and battery overvoltage in portable charging systems. It features 6.8 V input OVP threshold, 1.0 A typical OCP (set via ILIM resistor), 4.35 V battery OVP, <1 μs OVP response, and thermal shutdown. It is used in smartphone and PDA charger circuits to isolate faulty adapters before damage occurs.
For engineers reviewing the BQ24316DSJT datasheet, BQ24316DSJT pinout, BQ24316DSJT application, or BQ24316DSJT equivalent, this page delivers verified functional role, exact protection thresholds, real-world timing behavior (tPD(OVP) = 1 μs), package-specific thermal metrics (RθJA = 49.8 °C/W), and validated alternative parts for Li-ion front-end safety design.
Technical Context
The BQ24316DSJT integrates three independent protection channels: a fast analog comparator for input overvoltage (6.8 V threshold, <1 μs propagation delay), a current-sense amplifier with programmable blanking (176 μs) and recovery (64 ms), and a precision bandgap-referenced battery voltage monitor (4.35 V ±25 mV). All functions operate autonomously without host intervention.
Its internal P-channel FET switch (Q1) is controlled by overlapping logic blocks - UVLO (2.7 V), OVP, OCP, BOVP, and thermal shutdown (145 °C) - with hierarchical priority and hysteresis (e.g., 60 mV OVP hysteresis). Fault status is reported via open-drain FAULT pin, while CE enables full system-level control and counter reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input OVP Threshold | 6.6–7.0 V (bq24316 variant; enables safe AC adapter rejection above 5.5 V USB-OTG or 6.3 V wall adapter rails) |
| OVP Response Time | <1 μs (prevents transient-induced battery stress or downstream IC damage during adapter plug-in spikes) |
| Input OCP Range | 0.3–1.5 A (user-set via ILIM resistor; supports 500 mA–1.2 A charging paths with 25 kΩ → 1.0 A nominal) |
| Battery OVP Threshold | 4.30–4.40 V (tight 4.35 V nominal; prevents Li-ion cell overcharge and gas generation at pack level) |
| Junction Temp Shutdown | 140–150 °C (thermal cutoff with 20 °C hysteresis; protects against PCB hotspots during sustained 1.5 A operation) |
| Supply Current (Active) | 400–600 μA (ultra-low quiescent draw; extends battery runtime in always-on protection mode) |
| Package Thermal Resistance | RθJA = 49.8 °C/W (VSON-8 3×4 mm; enables 1.5 A continuous operation with minimal copper area) |
Pinout & Package
Package: VSON-8 (DSJ), 3.00 mm × 4.00 mm, exposed thermal pad connected internally to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1, 2) | Power input node | Must be shorted on PCB; accepts up to 30 V DC; requires ≥1 μF ceramic bypass to VSS |
| VSS (Pin 3) | Ground reference | Primary return path; thermal pad must be soldered to same net for thermal performance |
| FAULT (Pin 4) | Open-drain fault indicator | Drives low on OVP/OCP/BOVP/thermal fault; requires external pull-up for host GPIO monitoring |
| CE (Pin 7) | Chip enable control | Active-low; internal pulldown allows floating for default-enable; resets OCP/BOVP counters on toggle |
| ILIM (Pin 9) | OCP threshold programming | Resistor-to-VSS sets current limit per IOCP ≈ 25 / RILIM (kΩ); e.g., 25 kΩ → 1.0 A |
| OUT (Pins 10, 11) | Protected output to charger | Switched P-FET source; connects to downstream charging IC; requires ≥1 μF ceramic bypass |
| VBAT (Pin 8) | Battery voltage sense | High-impedance input (10 nA bias); connect via 100–470 kΩ resistor to Li-ion pack+ for safety isolation |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent protection | Simultaneous real-time monitoring of VIN, IIN, and VBAT with no software dependency |
| User-programmable OCP | Adjustable 300–1500 mA range via single external resistor - no firmware update needed |
| Sub-microsecond OVP response | 1 μs propagation delay isolates downstream circuitry before transient energy couples into battery |
| Fault event counter | 15-event lockout per charge cycle prevents repeated fault cycling; cleared only by power cycle or CE toggle |
| Thermal-aware switching | Soft-stop FET turn-off during OCP/BOVP avoids input voltage ringing caused by cable inductance |
Applications
| Smartphone Charging Protection | Bluetooth Headset Power Management |
|---|---|
Use Scenario: AC adapter plugged into smartphone during active charging; adapter fails and outputs 12 V instead of 5 V. IC Role / Device Role / Timing Role: Front-end protector; detects overvoltage in <1 μs and disconnects IN from OUT via internal P-FET. Use Value: Prevents 12 V from reaching the main charger IC (e.g., BQ2419x) and Li-ion pack, avoiding fire hazard or permanent damage. |
Use Scenario: USB-powered Bluetooth headset experiences cable-induced current surge during hot-plug. IC Role / Device Role / Timing Role: Input current limiter; clamps IIN at programmed threshold (e.g., 500 mA) for 176 μs before disconnecting. Use Value: Stops inrush from damaging low-voltage LDOs or audio codecs while allowing normal 100 mA charging to continue. |
| PDA Battery Safety Monitoring | MP3 Player Adapter Fault Isolation |
Use Scenario: Aging Li-ion pack in PDA develops internal short, causing terminal voltage to rise to 4.5 V during charge. IC Role / Device Role / Timing Role: Battery overvoltage detector; compares VBAT against 4.35 V reference and asserts FAULT within 176 μs. Use Value: Disables charging path before cell venting or thermal runaway initiates, meeting IEC 62133 safety requirements. |
Use Scenario: Third-party wall adapter delivers unstable 7.2 V ripple to MP3 player; causes repeated OVP trips. IC Role / Device Role / Timing Role: Adaptive protection controller; uses 60 mV OVP hysteresis and 8 ms deglitch to reject false triggers from ripple. Use Value: Maintains system uptime by ignoring benign line noise while still responding to true hazardous overvoltage events. |
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 |
|---|---|---|---|
| BQ24314DSGT | Lower 5.71–6.0 V input OVP threshold; identical pinout, package, and BOVP/thermal specs | Suitable for 5 V-only systems (e.g., USB-PD 5 V mode); not robust for 6.3 V adapter tolerance stacks | Select BQ24314DSGT when adapter rail is strictly ≤5.5 V and tighter OVP margin is acceptable. |
| TPS259211DSGR | Single-function 2.7–18 V eFuse with 0.6–5.3 A adjustable OCP; no BOVP or OVP - only current limiting | Requires external OVP/BOVP circuitry; lacks integrated battery voltage monitoring and fault coordination | Choose TPS259211DSGR only if BOVP is handled elsewhere and ultra-fast current limiting (<100 ns) is prioritized over integrated safety. |
Compared with BQ24316DSJT, BQ24314DSGT offers lower OVP headroom but identical integration, while TPS259211DSGR provides superior current-limit speed but requires added components for full Li-ion protection - making BQ24316DSJT the only single-chip solution covering all three critical failure modes.
Availability
BQ24316DSJT is available at Aetrix Electronics and suitable for smartphone charging circuits, portable medical monitors, and Bluetooth headset power management requiring stable component supply across multi-year production cycles.
Supply support for BQ24316DSJT 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, embedded processing, and power management technologies, with leadership in battery management and protection solutions.
The BQ24316DSJT belongs to TI's bq2431x family of integrated Li-ion front-end protectors, designed specifically to replace discrete OVP/OCP/BOVP circuits in space-constrained portable electronics where reliability and safety certification are mandatory.
FAQ
What is the exact input overvoltage protection threshold for BQ24316DSJT?
The BQ24316DSJT has a guaranteed input overvoltage protection threshold of 6.6 V minimum, 6.8 V typical, and 7.0 V maximum at room temperature. This value is factory-trimmed and applies specifically to the bq24316 variant - distinct from the bq24314's 5.71–6.0 V range. The 60 mV hysteresis ensures stable re-engagement after fault clearance.
How does the ILIM pin set overcurrent protection on BQ24316DSJT?
The ILIM pin on BQ24316DSJT sets input overcurrent protection by connecting an external resistor (RILIM) from ILIM to VSS. The threshold follows IOCP ≈ 25 / RILIM (with RILIM in kΩ and IOCP in A); for example, a 25 kΩ resistor yields 1.0 A nominal. The device measures the voltage drop across this resistor to regulate current before triggering shutdown.
Can BQ24316DSJT be used without connecting the VBAT pin?
Yes, BQ24316DSJT can operate without VBAT connection if battery overvoltage protection is not required - in that case, VBAT must be tied directly to VSS. However, omitting VBAT disables BOVP functionality entirely, leaving the system unprotected against overcharged Li-ion cells, which violates basic safety standards for portable devices.
What is the thermal performance difference between BQ24316DSJT and BQ24316DSGT?
BQ24316DSJT (VSON-8, 3×4 mm) has RθJA = 49.8 °C/W, while BQ24316DSGT (WSON-8, 2×2 mm) has RθJA = 58.6 °C/W. This 8.8 °C/W difference means BQ24316DSJT sustains 1.5 A continuous current with ~9 °C lower junction rise under identical PCB conditions - critical for compact layouts with limited copper area.
Does BQ24316DSJT provide reverse current blocking?
No, BQ24316DSJT does not provide reverse current blocking. Its internal P-FET is unidirectional (source to IN, drain to OUT), allowing current flow only from input to output. If reverse current from battery to adapter is possible in the system (e.g., during adapter removal), an external reverse-blocking diode or MOSFET must be added upstream of the BQ24316DSJT IN pins.
BQ24316DSJT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-VFDFN 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:
- 12-VSON (4x3)
BQ24316DSJT FAQ
1.How can I place an order for BQ24316DSJT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24316DSJT 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 BQ24316DSJT reliable?
The price and inventory of BQ24316DSJT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24316DSJT is usually 5 days.
3.What payment methods are accepted for BQ24316DSJT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24316DSJT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24316DSJT?
BQ24316DSJT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24316DSJT 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 BQ24316DSJT?
For technical support, including BQ24316DSJT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24316DSJT requirements.
6.How does Aetrix verify that BQ24316DSJT is sourced from the original manufacturer or authorized distributors?
All BQ24316DSJT 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 BQ24316DSJT meets industry standards.
7.What is the process for return or replacement of BQ24316DSJT?
All BQ24316DSJT units undergo pre-shipment inspection (PSI). If there is an issue with BQ24316DSJT, 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 BQ24316DSJT part is unused and in its original packaging.
Return procedure for BQ24316DSJT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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