My Inquiry
My Account
Texas Instruments BQ24314DSJR
- Part No.:
- BQ24314DSJR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
BQ24314DSJR.pdf
- Description:
- IC BATT PROTECTION LI-ION 12VSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,454
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BQ24314DSJR from Texas Instruments is a Li-ion battery front-end protection IC that provides integrated overvoltage, overcurrent, and battery overvoltage protection in a single 8-pin WSON (2 mm × 2 mm) package. It features 5.85 V input overvoltage threshold (typ), 1 A user-programmable overcurrent limit (via ILIM resistor), and 4.35 V battery overvoltage cutoff - all with sub-1 μs OVP response - for use in mobile phone and smart phone charging circuits.
For engineers reviewing the BQ24314DSJR datasheet, BQ24314DSJR pinout, BQ24314DSJR application, or BQ24314DSJR equivalent, this device serves as a critical safety guard between AC adapter inputs and Li-ion battery charging systems - requiring precise coordination of CE enable control, FAULT status monitoring, and ILIM resistor selection to meet IEC 62368-1 system-level safety requirements.
Technical Context
The BQ24314DSJR integrates three independent protection channels: input overvoltage detection with <1 μs propagation delay, programmable input overcurrent limiting using an external ILIM resistor (25 kΩ yields 1 A threshold), and fixed 4.35 V battery overvoltage sensing with 275 mV hysteresis. All protections trigger internal P-FET shutdown and assert open-drain FAULT low.
It operates across 3.3–26 V input range, supports up to 1.5 A continuous output current, and includes thermal shutdown at 145 °C (with 20 °C hysteresis). The CE pin enables host-controlled power gating, while UVLO (2.7 V typ) and soft-start prevent inrush-induced ringing during power-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input OVP Threshold | 5.85 V (typ); triggers immediate FET shutdown within 1 μs to prevent downstream damage from faulty adapters |
| Input Overcurrent Limit | 1 A (typ, RILIM = 25 kΩ); user-programmable via resistor to match system cable and charger capability |
| Battery OVP Threshold | 4.35 V (nom); protects Li-ion cells from overcharge by disconnecting IN–OUT path when VBAT exceeds threshold |
| Operating Input Range | 3.3–26 V; accommodates USB PD, 5 V wall adapters, and higher-voltage industrial supplies |
| Thermal Shutdown | 145 °C (TJ(OFF)); disables FET and asserts FAULT until junction cools by ≥20 °C |
| Quiescent Current | 400 μA (typ, CE = Low); enables low-power always-on protection without significant battery drain |
| Package | 8-pin WSON (DSJ suffix), 2.0 mm × 2.0 mm; exposes thermal pad tied to VSS for PCB heat dissipation |
Pinout & Package
Package: 8-pin WSON (DSJ), 2.0 mm × 2.0 mm body, exposed thermal pad electrically connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1,2) | Input power supply terminal | Accepts DC adapter input; must be decoupled with ≥1 μF ceramic capacitor close to pin |
| VSS (Pin 3) | Ground reference | Primary ground return; thermal pad must be soldered to same net for thermal management |
| 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 5) | Chip enable control | Active-low enable; internal pulldown allows floating for default-on operation; resets OCP/BOVP counters on toggle |
| NC (Pin 6) | No-connect | Internally unused; must remain unconnected per datasheet |
| ILIM (Pin 7) | Overcurrent threshold programming | Connects to VSS via resistor (e.g., 25 kΩ for 1 A); sets IOCP = 25 / RILIM (kΩ) in amperes |
| VBAT (Pin 8) | Battery voltage sense input | Monitors pack voltage through series resistor (100–470 kΩ recommended) to limit fault-current risk |
| OUT (Pin 8, shared) | Protected output to charging circuit | Delivers regulated input to downstream charger IC; requires ≥1 μF ceramic capacitor at pin |
Key Features
| Feature | Design Value |
|---|---|
| Rapid input overvoltage response | <1 μs propagation delay ensures protection before transient energy damages downstream Li-ion charger ICs |
| User-programmable overcurrent limit | Resistor-based IOCP setting (300–1500 mA range) enables precise matching to cable gauge and adapter rating |
| Dual-stage OCP recovery | 176 μs blanking window prevents false trips from inrush, followed by 64 ms auto-retry after persistent overcurrent |
| Fail-safe battery voltage monitoring | Fixed 4.35 V BVOVP with 275 mV hysteresis avoids cell overcharge while preventing oscillation near threshold |
| Integrated thermal shutdown | 145 °C trip point with 20 °C hysteresis maintains safe junction temperature under sustained overload or poor PCB layout |
Applications
| Smartphone Charging Protection | Bluetooth Headset Power Management |
|---|---|
|
Use Scenario: Prevents damage from counterfeit AC adapters delivering >6 V to smartphone charging circuits. IC Role / Device Role / Timing Role: Front-end safety switch that isolates faulty input before it reaches the main charger IC (e.g., BQ24080). Use Value: Eliminates need for discrete TVS + fuse + resettable PTC stack; reduces BOM count by 3 components while improving response time. |
Use Scenario: Safeguards ultra-low-power Bluetooth headsets against overvoltage events during rapid plug/unplug cycles. IC Role / Device Role / Timing Role: Always-on protector between micro-USB port and linear charger, asserting FAULT within 1 μs on OVP. Use Value: Enables reliable hot-plug operation without brownout or latch-up - critical for wearables with no user-serviceable fuses. |
| MP3 Player Battery Safety | PDA System-Level Compliance |
|
Use Scenario: Ensures Li-ion cells in portable media players never exceed 4.4 V during abnormal charging conditions. IC Role / Device Role / Timing Role: Battery overvoltage monitor feeding VBAT pin; triggers permanent shutdown after 15 BOVP faults per charge cycle. Use Value: Meets IEC 62368-1 Clause 6.3.2 requirement for redundant overvoltage protection in Class III equipment. |
Use Scenario: Supports regulatory certification of PDAs by providing documented, testable overcurrent protection independent of host firmware. IC Role / Device Role / Timing Role: Hardware-enforced current limiter with CE-controlled enable/disable for audit-ready safety architecture. Use Value: Reduces functional safety validation effort by replacing software-based current monitoring with deterministic analog protection. |
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 |
|---|---|---|---|
| BQ24316DSGR | Higher 6.8 V input OVP threshold (vs. 5.85 V); identical pinout and feature set | Suitable for 9 V adapter-based systems where 5.85 V OVP would cause nuisance tripping | Select BQ24316DSGR only if input source nominal voltage exceeds 5.5 V and system tolerates higher OVP threshold |
| TPS259211DRCR | Programmable overcurrent only (no battery OVP or input OVP); 2.7–18 V input; 5.5 A max | Used in non-battery applications like USB-C PD sink protection where battery monitoring is absent | Choose TPS259211DRCR only when full triple-protection (OVP/OCP/BOVP) is not required and higher current capacity is needed |
Compared with BQ24314DSJR, BQ24316DSGR offers higher input OVP headroom but identical protection architecture, while TPS259211DRCR trades battery and input overvoltage coverage for wider current range and simpler configuration - making BQ24314DSJR the only option meeting full Li-ion front-end safety requirements in compact 2×2 mm footprint.
Availability
BQ24314DSJR is available at Aetrix Electronics and suitable for smartphone charging circuits, Bluetooth headset power paths, and MP3 player battery safety systems requiring stable component supply and long-term lifecycle support.
Supply support for BQ24314DSJR 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, designing analog and embedded processing products for industrial, automotive, and personal electronics markets.
The BQ24314DSJR belongs to TI's battery management portfolio, engineered specifically to provide hardware-enforced, triple-protection safety for Li-ion charging front-ends in space-constrained portable devices.
FAQ
What is the exact input overvoltage protection threshold for BQ24314DSJR?
The BQ24314DSJR has a typical input overvoltage protection threshold of 5.85 V, with a minimum of 5.71 V and maximum of 6.0 V across temperature and process variation. This value is factory-trimmed and specified in the Electrical Characteristics table of the SLUS763D datasheet. The BQ24314DSJR uses this threshold to disable its internal pass FET within 1 μs when VIN exceeds the limit - ensuring robust protection against faulty 5 V adapters.
How do I configure the overcurrent limit for BQ24314DSJR?
The BQ24314DSJR overcurrent limit is set by connecting a resistor between the ILIM pin and VSS. Using the formula IOCP = 25 ÷ RILIM (where RILIM is in kΩ and IOCP is in A), a 25 kΩ resistor configures a 1 A limit. The BQ24314DSJR supports 300–1500 mA range; values outside this range may cause inaccurate triggering or failure to activate protection. Always verify with oscilloscope current measurement during fault testing.
Does BQ24314DSJR require external components for basic operation?
Yes - the BQ24314DSJR requires at minimum: (1) a 1 μF ceramic capacitor from IN to VSS, (2) a 1 μF ceramic capacitor from OUT to VSS, (3) a resistor from ILIM to VSS for overcurrent setting, and (4) a pull-up resistor on FAULT for host monitoring. The BQ24314DSJR also recommends a 100–470 kΩ resistor between VBAT and battery positive to limit fault current - omitting this compromises safety compliance per TI design guidelines.
Can BQ24314DSJR be used without a microcontroller?
Yes - the BQ24314DSJR can operate autonomously with CE pin tied to VSS (enabled) or left floating (enabled via internal pulldown). FAULT status can be monitored with a simple LED or comparator without firmware. However, the BQ24314DSJR's OCP and BOVP fault counters reset only on CE toggle or power cycle, so full diagnostic logging requires host interaction. Standalone use meets basic protection needs but limits fault history visibility.
What is the thermal pad connection requirement for BQ24314DSJR?
The exposed thermal pad of the BQ24314DSJR must be soldered directly to the VSS copper pour on the PCB - it is internally connected to the VSS pin and serves as the primary heat dissipation path. The BQ24314DSJR datasheet specifies RθJB = 24.9 °C/W for the DSJ package; insufficient thermal pad area or voiding will degrade thermal performance and risk premature thermal shutdown. Never use the thermal pad as sole ground return - the VSS pin must also be routed.
BQ24314DSJR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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)
BQ24314DSJR FAQ
1.How can I place an order for BQ24314DSJR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24314DSJR 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 BQ24314DSJR reliable?
The price and inventory of BQ24314DSJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24314DSJR is usually 5 days.
3.What payment methods are accepted for BQ24314DSJR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24314DSJR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24314DSJR?
BQ24314DSJR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24314DSJR 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 BQ24314DSJR?
For technical support, including BQ24314DSJR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24314DSJR requirements.
6.How does Aetrix verify that BQ24314DSJR is sourced from the original manufacturer or authorized distributors?
All BQ24314DSJR 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 BQ24314DSJR meets industry standards.
7.What is the process for return or replacement of BQ24314DSJR?
All BQ24314DSJR units undergo pre-shipment inspection (PSI). If there is an issue with BQ24314DSJR, 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 BQ24314DSJR part is unused and in its original packaging.
Return procedure for BQ24314DSJR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ24314DSJR 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…
