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Texas Instruments BQ24315DSGT
- Part No.:
- BQ24315DSGT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ24315DSGT.pdf
- Description:
- IC BATT PROTECTION LI-ION 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:219
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Product details
Overview
BQ24315DSGT from Texas Instruments is a Li-ion battery front-end protection IC designed for AC adapter-powered portable systems. It provides integrated input overvoltage (5.85 V threshold), user-programmable input overcurrent (adjustable 300–1500 mA), and battery overvoltage (4.35 V) protection, with linear regulation to 5.5 V output and rapid <200 ns OVP response. It serves as a safety-critical interface between DC input and charging circuitry in compact handheld devices.
For engineers reviewing the BQ24315DSGT datasheet, BQ24315DSGT pinout, BQ24315DSGT application, or BQ24315DSGT equivalent, key selection criteria include its 5.85 V OVP threshold, 2 mm × 2 mm SON package, 1.5 A input current capability, thermal shutdown at 140°C, and open-drain FAULT signaling for host microcontroller integration.
Technical Context
The BQ24315DSGT implements independent analog monitoring loops for input voltage (OVP), input current (via ILIM resistor), and battery voltage (VBAT sense), each triggering internal FET Q1 shutdown within microseconds upon fault detection. Its linear regulator architecture maintains regulated 5.5 V output when input is between 5.5 V and 5.85 V, with dropout voltage ≤280 mV at 1 A.
Control logic includes undervoltage lockout (2.7 V), CE-enabled active-low enable, deglitch timers (tDGL(PGOOD) = 8 ms, tON(OVP) = 8 ms), and dual fault counters (15-event latch-up for OCP and BVOVP). Thermal shutdown (140°C) and hysteresis (20°C) operate independently of other protections.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 5.85 V ±0.15 V - triggers immediate FET shutdown on adapter overvoltage, preventing downstream damage |
| Output Regulation | 5.5 V ±0.15 V - stable LDO-mode supply for charger ICs when input is 5.7–5.85 V |
| Input Current Limit | Adjustable 300–1500 mA via ILIM resistor - enables precise system-level current budgeting |
| Battery OVP | 4.35 V ±0.05 V - disconnects charging path if Li+ cell exceeds safe voltage, protecting cell integrity |
| Thermal Shutdown | 140°C ±10°C - disables FET until die cools by ≥20°C, preventing thermal runaway |
| Package | 2 mm × 2 mm SON-8 with PowerPAD™ - enables high-power density layout with low RθJA (75°C/W) |
| Propagation Delay | <200 ns OVP response - critical for surviving fast-rising ESD or surge transients |
Pinout & Package
Package: 2 mm × 2 mm SON-8 with exposed thermal pad (internally connected to VSS); requires PCB ground plane coupling via thermal vias for reliable 1.5 A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input power supply | Accepts 3.3–30 V DC; must be bypassed with ≥1 µF ceramic capacitor to suppress cable-induced transients |
| VSS (Pin 2) | Ground reference | Primary return path; thermal pad is electrically tied to this pin and must connect to PCB ground plane |
| NC (Pin 3) | No connect | Internal test pin - no external connection permitted during normal operation |
| FAULT (Pin 4) | Open-drain fault indicator | Drives low on OVP/OCP/BVOVP/thermal fault; requires external pullup for host GPIO monitoring |
| CE (Pin 5) | Active-low enable | Pulled down internally; tie to GND for always-on operation or drive high to disable protection and clear fault counters |
| VBAT (Pin 6) | Battery voltage sense | High-impedance input (10 nA bias); connect through 100–470 kΩ resistor to avoid hazardous fault currents |
| ILIM (Pin 7) | OCP programming | Resistor-to-ground sets current limit per IOCP = 25 / R(ILIM) (kΩ) in amps; tolerance affects trip accuracy |
| OUT (Pin 8) | Regulated output | Delivers up to 1.5 A to downstream charger IC; bypass with ≥1 µF ceramic capacitor for OVP loop stability |
Key Features
| Feature | Design Value |
|---|---|
| Rapid input overvoltage cutoff | <200 ns propagation delay ensures survival against fast transients without clamping diodes |
| User-adjustable overcurrent threshold | 300–1500 mA range set by single external resistor, enabling precise system-level current allocation |
| Dual fault counters with latch-up | 15-event counters for OCP and BVOVP prevent repeated fault cycling; cleared only by power cycle or CE toggle |
| Soft-stop reverse current handling | Supports accessory power delivery (OUT→IN) up to 1.5 A when VOUT > UVLO + 0.7 V, with no reverse OCP |
| Integrated thermal protection | 140°C shutdown with 20°C hysteresis eliminates need for external thermal sensors in space-constrained designs |
Applications
| Smartphone Charging Protection | Bluetooth Headset Power Management |
|---|---|
Use Scenario: AC adapter powers smartphone while simultaneously charging Li-ion battery and powering USB peripherals. IC Role / Device Role / Timing Role: Front-end protector isolating adapter from charger IC and battery; monitors IN, OUT, and VBAT in real time. Use Value: Prevents 30 V adapter faults from damaging 4.2 V battery or 5 V USB circuitry via sub-microsecond OVP response and 4.35 V BVOVP enforcement. | Use Scenario: Compact Bluetooth headset draws power from shared micro-USB port used for both charging and data. IC Role / Device Role / Timing Role: Bidirectional power gate enabling accessory power delivery (OUT→IN) while maintaining OVP/OCP protection during charge mode. Use Value: Enables safe reverse current flow up to 1.5 A without additional MOSFETs, leveraging internal FET's low RDS(on) and eliminating need for external reverse-blocking diode. |
| MP3 Player Battery Safety | PDA System-Level Fault Isolation |
Use Scenario: Portable MP3 player uses wall adapter for playback and charging; battery voltage must never exceed 4.35 V during fast-charge cycles. IC Role / Device Role / Timing Role: Battery overvoltage monitor that disconnects charging path before cell reaches unsafe voltage, independent of charger IC control. Use Value: Adds hardware-enforced BVOVP layer with 176 µs deglitch time, preventing software-only charger IC failures from causing thermal runaway. | Use Scenario: PDA with multiple power domains (LCD, CPU, radio) requires robust isolation between adapter input and sensitive subsystems. IC Role / Device Role / Timing Role: Single-point fault detector that removes all downstream power on any OVP/OCP/BVOVP/thermal event, signaled via FAULT pin to system controller. Use Value: Provides deterministic, sub-millisecond fault response across four independent failure modes, replacing discrete protection schemes with one 2×2 mm IC. |
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 |
|---|---|---|---|
| BQ24313DSGT | OVP threshold 10.5 V vs. BQ24315DSGT's 5.85 V; identical package, pinout, and feature set otherwise | Suitable for higher-voltage adapters (e.g., 9–12 V industrial chargers) where 5.85 V OVP would cause nuisance tripping | Select BQ24313DSGT only when input source exceeds 6.5 V nominal; verify adapter ripple stays below 10.2 V minimum OVP threshold |
| TPS259211DRCR | Programmable OVP (4.5–18 V) and OCP (1–5 A); no BVOVP or VBAT sense; 1.2 µs OVP response | Used in general-purpose load switching, not battery-specific protection; lacks battery voltage monitoring and fault latching | Choose TPS259211DRCR for non-battery applications requiring wider OVP/OCP adjustment range and faster response, but not for Li-ion safety-critical BVOVP enforcement |
Compared with BQ24313DSGT, the BQ24315DSGT offers lower OVP threshold optimized for 5 V adapter systems, while TPS259211DRCR provides broader programmability at the cost of missing battery-specific protections - making BQ24315DSGT the only option with integrated 4.35 V BVOVP and VBAT sensing in this footprint.
Availability
BQ24315DSGT is available at Aetrix Electronics and suitable for smartphone charging protection, Bluetooth headset power management, MP3 player battery safety, and PDA system-level fault isolation requiring stable component supply and long-term lifecycle support.
Supply support for BQ24315DSGT 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.
The BQ24315DSGT belongs to TI's battery management IC portfolio, engineered specifically for front-end protection of Li-ion cells in space-constrained portable electronics where hardware-enforced safety margins are mandatory.
FAQ
What is the exact overvoltage protection threshold for BQ24315DSGT?
The BQ24315DSGT has a fixed input overvoltage protection threshold of 5.85 V, with a typical tolerance of ±0.15 V (5.70 V to 6.00 V). This value is factory-trimmed and specified over –40°C to 125°C junction temperature. It triggers immediate FET shutdown within 200 ns, and recovery occurs after the input falls to 5.75 V (5.85 V minus 100 mV hysteresis) and a deglitch time of 8 ms. The BQ24315DSGT datasheet confirms this threshold is distinct from the BQ24313DSGT's 10.5 V rating.
How do I configure the overcurrent protection threshold for BQ24315DSGT?
The BQ24315DSGT overcurrent threshold is set by an external resistor (RILIM) connected between the ILIM pin and VSS. The relationship is IOCP = 25 / RILIM, where current is in amperes and resistance in kΩ. For example, a 25 kΩ resistor yields 1 A trip point. The BQ24315DSGT supports 300–1500 mA range using 15–90 kΩ resistors, with typical accuracy ±10% over temperature. Always verify actual trip current with bench testing due to resistor tolerance and layout parasitics.
Does BQ24315DSGT provide battery overvoltage protection, and how does it behave?
Yes, the BQ24315DSGT provides dedicated battery overvoltage protection at 4.35 V ±0.05 V, monitored continuously on the VBAT pin. When battery voltage exceeds this threshold, the internal FET switches off gradually ("soft-stop") and the FAULT pin goes low. Recovery occurs only after VBAT drops to 4.35 V minus hysteresis (200–320 mV), and the internal counter increments. Fifteen consecutive BVOVP events cause permanent latch-up until power is cycled or CE is toggled - a behavior explicitly documented for BQ24315DSGT in the SLUS817A datasheet.
Can BQ24315DSGT support reverse current flow from OUT to IN, and under what conditions?
Yes, the BQ24315DSGT supports reverse current (OUT → IN) for accessory power delivery when VOUT exceeds UVLO + 0.7 V (≈3.4 V), enabling conduction through the internal FET instead of a body diode. This mode supports up to 1.5 A with no overcurrent protection in reverse direction. The BQ24315DSGT datasheet specifies this capability in "Powering Accessories" section and Figure 25, confirming bidirectional operation is intrinsic to its architecture - but reverse OCP is intentionally omitted per design.
What is the recommended PCB layout practice for thermal management of BQ24315DSGT?
For optimal thermal performance, the BQ24315DSGT's exposed PowerPAD™ must be soldered to a solid copper area on the PCB connected to the VSS net via ≥4 thermal vias (0.3 mm diameter, spaced ≤1 mm apart). The datasheet specifies RθJA = 75°C/W with this layout; omitting vias or undersizing the copper pad risks exceeding 125°C junction limit at 1.5 A. Place input/output bypass capacitors (≥1 µF ceramic each) within 2 mm of their respective pins, and route VSS traces wide and short - all practices validated in BQ24315DSGT application note SLUS817A.
BQ24315DSGT 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (2x2)
BQ24315DSGT FAQ
1.How can I place an order for BQ24315DSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24315DSGT 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 BQ24315DSGT reliable?
The price and inventory of BQ24315DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24315DSGT is usually 5 days.
3.What payment methods are accepted for BQ24315DSGT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24315DSGT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24315DSGT?
BQ24315DSGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24315DSGT 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 BQ24315DSGT?
For technical support, including BQ24315DSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24315DSGT requirements.
6.How does Aetrix verify that BQ24315DSGT is sourced from the original manufacturer or authorized distributors?
All BQ24315DSGT 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 BQ24315DSGT meets industry standards.
7.What is the process for return or replacement of BQ24315DSGT?
All BQ24315DSGT units undergo pre-shipment inspection (PSI). If there is an issue with BQ24315DSGT, 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 BQ24315DSGT part is unused and in its original packaging.
Return procedure for BQ24315DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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