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Texas Instruments BQ24350DSGT
- Part No.:
- BQ24350DSGT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ24350DSGT.pdf
- Description:
- IC BATT PROTECTION LI-ION 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
BQ24350DSGT from Texas Instruments is an over-voltage and over-current charger front-end protection IC with integrated P-FET, designed for Li-ion battery charging circuits in portable electronics. It provides input OVP (6.17 V), input OCP (1.2 A typ), battery OVP (4.35 V), thermal shutdown (150°C), and LDO-mode CHGIN output regulation (5.5 V). It operates across 4.4–15 V ACIN and supports up to 1 A load current in mobile phone power path protection.
For engineers reviewing the BQ24350DSGT datasheet, BQ24350DSGT pinout, BQ24350DSGT application, or BQ24350DSGT equivalent, this page delivers verified functional role, validated protection thresholds, confirmed 2 mm × 2 mm SON-8 package mapping, real-world soft-start/soft-stop timing behavior, and direct alternative part comparisons grounded in TI's official ordering and electrical specifications.
Technical Context
The BQ24350DSGT implements dual internal P-FETs (Q1 and Q2) controlled by host-charger logic via GATDRV, enabling precise gate-driven charge path management. Its protection architecture includes independent deglitch timers for input OVP (256 µs), battery OVP (8.2 ms), and OCP (8.2 ms), plus blanking time (10 ms) and recovery delays (8.2–131 ms) to prevent false triggering during transients.
It operates in three distinct modes: power-on reset with soft-start, sleep mode (activated below VSENTRY = 10–105 mV ΔACIN–VOUT), and LDO regulation (CHGIN regulated to 5.5 V when ACIN exceeds VO(REG)). The integrated FETs deliver RDS(on) of 415–685 mΩ (ACIN→OUT) and 165–225 mΩ (CHGIN→OUT), with thermal shutdown hysteresis of 20°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input OVP Threshold | 6.17 V - triggers shutdown within 256 µs if ACIN exceeds this level, protecting downstream analog baseband ICs rated ≤5.5 V. |
| Input OCP Threshold | 1.2 A typical - limits inrush and fault current; activates after 8.2 ms deglitch window to avoid false trips on startup spikes. |
| Battery OVP Threshold | 4.35 V - disables power path if VBAT exceeds safe Li-ion full-charge voltage, with 250 mV hysteresis for stable recovery. |
| CHGIN Output Regulation | 5.5 V ±0.17 V - supplies stable LDO-mode power to host charger controller, eliminating need for external linear regulator. |
| Operating Input Range | 4.4 V to 15 V - supports standard USB, wall adapters, and automotive accessory port inputs without external scaling. |
| Junction Temp Limit | 150°C - thermal shutdown engages with 20°C hysteresis, ensuring reliable operation under sustained 1 A load in compact layouts. |
| Package | 2 mm × 2 mm WSON-8 (DSG) - exposes thermal pad tied to GND; requires PCB copper area + thermal vias for ≤75°C/W θJA. |
Pinout & Package
Package: 2 mm × 2 mm, 8-pin WSON (DSG) with exposed thermal pad electrically connected to GND. Requires soldering thermal pad to PCB ground plane for thermal performance and mechanical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ACIN (Pins 1,2) | Power supply input | Dual-pin high-current input node; accepts 4.4–15 V DC; requires ≥1 µF ceramic bypass capacitor to GND. |
| GND (Pin 3) | Ground reference | Primary signal and power return; thermal pad is internally bonded to this pin and must be connected to PCB GND. |
| VBAT (Pin 4) | Battery voltage sense | High-impedance input (10 nA leakage); connects to pack+ via 100–470 kΩ resistor RBAT for safe BVOVP monitoring. |
| GATDRV (Pin 5) | Host gate drive interface | Input controlling internal P-FET Q1/Q2; driven by host charger controller to enable/disable charge path dynamically. |
| CHGIN (Pin 6) | Host controller power output | LDO-regulated 5.5 V output (±0.17 V); supplies host charger IC; requires ≥1 µF local bypass capacitor. |
| OUT (Pins 7,8) | Charging system output | Dual-pin high-current output to battery/charging circuit; carries full load current up to 1 A through integrated FETs. |
Key Features
| Feature | Design Value |
|---|---|
| Soft-start sequence | Controls inrush current during power-up to minimize ringing from adapter cable inductance and input capacitance resonance. |
| Soft-stop shutdown | Gradually reduces gate drive during OVP/OCP faults to suppress voltage spikes caused by LC resonance in input cabling. |
| Integrated dual P-FETs | Eliminates external reverse-blocking diode and discrete FET, reducing BOM count and forward voltage drop in charge path. |
| Sleep mode auto-entry/exit | Activates below 10–105 mV ACIN–VOUT differential and exits above 24–160 mV, enabling diode-like behavior without external components. |
| Accurate protection thresholds | Input OVP (±0.18 V), battery OVP (±0.05 V), and OCP (±0.18 A) tolerances ensure robust fault detection across –40°C to 125°C junction range. |
Applications
| Mobile Phone Power Path Protection | Low-Power Handheld Device Charger Front-End |
|---|---|
|
Use Scenario: AC adapter plug-in causes input voltage spike up to 16 V before regulation; battery voltage rises to 4.35 V during CC/CV charge termination. IC Role / Device Role / Timing Role: Front-end protector that monitors ACIN and VBAT in real time, disabling Q1/Q2 within 256 µs (OVP) or 8.2 ms (BVOVP) to isolate battery and host. Use Value: Prevents damage to 5.5 V-rated analog baseband ICs and avoids overcharged Li-ion cells, meeting IEC 62368-1 transient safety requirements. |
Use Scenario: Intermittent USB power delivery with variable source impedance; host charger controller requires clean, regulated 5.5 V supply. IC Role / Device Role / Timing Role: Dual-role device providing both protected power path (ACIN→OUT) and regulated auxiliary supply (ACIN→CHGIN) with shared protection logic. Use Value: Delivers stable CHGIN voltage while enforcing OVP/OCP/BVOVP on main path-reducing component count versus discrete protection + LDO solution. |
| Current-Limited Host Controller Power Supply | Li-ion Battery Pack Safety Interface |
|
Use Scenario: Host microcontroller initiates charging only when system is awake; power must be cut rapidly during brownout or thermal fault. IC Role / Device Role / Timing Role: Controlled power switch with GATDRV input, enabling host-synchronized enable/disable while retaining autonomous OVP/OCP response. Use Value: Enables firmware-controlled power sequencing without sacrificing hardware-level fault response speed (<1 ms for OVP). |
Use Scenario: Battery pack with no built-in protection circuitry; relies on front-end IC to enforce safe charge voltage and detect cell overvoltage. IC Role / Device Role / Timing Role: Battery-side monitor using VBAT pin with precision 4.35 V threshold and 250 mV hysteresis to prevent Li-ion degradation or thermal runaway. Use Value: Provides certified battery OVP function without requiring dedicated fuel gauge or protection ASIC, lowering total BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charger front-end protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24352DSGT | Higher input OVP threshold (7.1 V vs. 6.17 V); identical pinout, package, and all other protections. | Suitable for systems using higher-voltage adapters (e.g., 9 V USB PD) where 6.17 V OVP would cause nuisance shutdowns. | Select BQ24352DSGT when ACIN sources exceed 6.35 V peak; otherwise BQ24350DSGT ensures tighter margin against 5.5 V downstream IC stress. |
| TPS259211DRCR | Single-channel eFuse with 6.1 V OVP, 1.5 A OCP, but no battery OVP, no CHGIN LDO output, and no GATDRV control interface. | Provides basic input protection only; cannot replace BQ24350DSGT in host-controlled charge architectures requiring VBAT monitoring or auxiliary supply. | Use TPS259211DRCR only for non-battery applications needing simple input rail protection; not a functional substitute for BQ24350DSGT's integrated charger front-end role. |
Compared with BQ24352DSGT, the BQ24350DSGT offers tighter input OVP margin for 5 V adapter systems, while TPS259211DRCR lacks battery monitoring, host gate control, and regulated CHGIN output-making it unsuitable as a drop-in or feature-complete alternative.
Availability
BQ24350DSGT is available at Aetrix Electronics and suitable for mobile phone power path protection, low-power handheld device charger front-ends, and current-limited host controller power supply designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for BQ24350DSGT 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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in battery management and power protection ICs.
The BQ24350DSGT belongs to TI's bq243xx family of charger front-end protection ICs, engineered specifically to safeguard Li-ion batteries and host controllers in space-constrained portable devices against input transients, overcurrent, overvoltage, and thermal faults.
FAQ
What is the primary function of the BQ24350DSGT in a Li-ion charging system?
The BQ24350DSGT serves as a front-end protection IC that safeguards Li-ion batteries and downstream analog ICs from hazardous conditions including input over-voltage (6.17 V), input over-current (1.2 A), battery over-voltage (4.35 V), and thermal overload (150°C). It integrates dual P-FETs and provides a regulated 5.5 V CHGIN output for the host charger controller, eliminating the need for external discrete protection components in mobile phone and handheld device designs. The BQ24350DSGT enables robust, compact, and standards-compliant power path architecture.
Does the BQ24350DSGT require external components to implement battery over-voltage protection?
Yes-the BQ24350DSGT requires an external resistor (RBAT) between the battery pack positive terminal and the VBAT pin to safely implement battery over-voltage protection. TI recommends RBAT values between 100 kΩ and 470 kΩ to limit fault current to <270 µA while keeping BVOVP measurement error below 1 mV. Direct connection of VBAT to the battery is unsafe due to potential 30 V fault voltage coupling; the BQ24350DSGT's internal 4.35 V BVOVP comparator relies on this resistive divider for accurate, fail-safe monitoring.
How does the BQ24350DSGT handle input voltage transients during AC adapter plug-in?
The BQ24350DSGT combats input transients using coordinated soft-start and soft-stop behaviors. During plug-in, its soft-start sequence limits inrush current to prevent LC resonance-induced ringing. If a transient exceeds 6.17 V, the BQ24350DSGT disables internal FETs within 256 µs (tDGL(OVP))-but only after a 10 ms blanking time (tBLK(CHGIN)) to ignore startup spikes. Upon fault clearance, it recovers after 8.2 ms (tREC(OVP)), ensuring stable re-engagement only when ACIN stabilizes below 5.87 V (6.17 V – 300 mV hysteresis).
Can the BQ24350DSGT operate without a host microcontroller or charger controller?
No-the BQ24350DSGT requires active host control via the GATDRV pin to enable or disable its internal P-FETs (Q1/Q2) for normal charge path operation. While it autonomously executes protection responses (OVP/OCP/BVOVP), the gate drive signal must be supplied by an external charger controller or microcontroller. In absence of GATDRV drive, the BQ24350DSGT remains latched off after power-up reset. It does not support standalone or self-timed charging functions; the BQ24350DSGT is explicitly designed as a host-managed protection layer, not a complete charger IC.
What is the purpose of the CHGIN pin on the BQ24350DSGT, and what load can it drive?
The CHGIN pin on the BQ24350DSGT delivers a regulated 5.5 V (±0.17 V) LDO output derived from the ACIN supply, intended to power the host charger controller IC. It supports up to 1 A load current with typical RDS(on) of 250–495 mΩ (ACIN→CHGIN), and requires a minimum 1 µF ceramic bypass capacitor to GND. This eliminates the need for a separate LDO regulator in the power tree, simplifying design and improving efficiency-especially critical in space-constrained mobile platforms where the BQ24350DSGT is commonly deployed.
BQ24350DSGT 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)
BQ24350DSGT FAQ
1.How can I place an order for BQ24350DSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24350DSGT 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 BQ24350DSGT reliable?
The price and inventory of BQ24350DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24350DSGT is usually 5 days.
3.What payment methods are accepted for BQ24350DSGT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24350DSGT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24350DSGT?
BQ24350DSGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24350DSGT 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 BQ24350DSGT?
For technical support, including BQ24350DSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24350DSGT requirements.
6.How does Aetrix verify that BQ24350DSGT is sourced from the original manufacturer or authorized distributors?
All BQ24350DSGT 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 BQ24350DSGT meets industry standards.
7.What is the process for return or replacement of BQ24350DSGT?
All BQ24350DSGT units undergo pre-shipment inspection (PSI). If there is an issue with BQ24350DSGT, 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 BQ24350DSGT part is unused and in its original packaging.
Return procedure for BQ24350DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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