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Texas Instruments BQ24308DSGR
- Part No.:
- BQ24308DSGR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ24308DSGR.pdf
- Description:
- IC BATT PROTECTION LI-ION 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:5,417
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Product details
Overview
BQ24308DSGR from Texas Instruments is an integrated Li-ion battery front-end protection IC that provides simultaneous input overvoltage (6.3 V), input overcurrent (700 mA typ.), and battery overvoltage (4.35 V) protection with 5 V LDO-mode regulation. It features internal FET switching, programmable OCP via ILIM pin, thermal shutdown at 145 °C, and PGATE output for external reverse-polarity P-FET control - deployed in mobile phone charging circuits to prevent damage from faulty adapters.
For engineers reviewing the BQ24308DSGR datasheet, BQ24308DSGR pinout, BQ24308DSGR application, or BQ24308DSGR equivalent, this page delivers verified functional roles, validated protection thresholds, confirmed WSON-8 package mapping, real-world timing behavior (e.g., 0.2–1 µs OVP propagation delay), and precise alternative selection guidance for battery safety-critical front-end designs.
Technical Context
The BQ24308DSGR implements a dual-stage fault response: fast hard-shutdown for OVP (sub-µs turn-off) and current-limiting with blanking (5 ms) followed by latched shutdown for persistent OCP. Its protection logic continuously monitors IN, OUT, and VBAT while coordinating UVLO (2.7 V), soft-start, and deglitch timers (tDGL(PGOOD) = 8 ms, tDGL(BOVP) = 176 µs) to avoid false triggering from transients.
It integrates a charge-pump-based gate driver (PGATE) with clamp voltage of 15 V (typ.) for external P-FET control, enabling –30 V reverse-polarity tolerance. The CE pin provides active-low enable with internal 200 kΩ pulldown, and VBAT sensing uses ultra-low 10 nA bias current to minimize error from RBAT divider networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input OVP Threshold | 6.3 V (typ.) - triggers immediate FET turn-off if adapter exceeds safe level; 60 mV hysteresis prevents oscillation during recovery |
| Input OCP Threshold | 700 mA (typ.) - limits surge current; programmable up to 1.5 A using external RILIM resistor per IOCP(program) = IOCP + 25 kΩ/RILIM |
| Battery OVP Threshold | 4.35 V (nom.) - protects Li+ cells from overcharge; 275 mV hysteresis ensures stable re-enable after voltage drops to 4.075 V |
| Regulated Output Voltage | 5.0 V ±150 mV - supplies stable 5 V to downstream charger ICs; maintains regulation down to 250 mA load with 75 mV dropout |
| Thermal Shutdown | 145 °C (typ.) - disables FET until junction cools by 20 °C hysteresis; critical for sustained 1.5-A operation in compact handheld enclosures |
| Supply Current | 500 µA (typ.) - enables low-power always-on monitoring; standby current drops to 95 µA when CE = high |
| Package | 2 mm × 2 mm WSON-8 - exposes thermal pad tied to VSS; requires PCB copper pour for RθJB = 29.7 °C/W thermal performance |
Pinout & Package
Package: 2 mm × 2 mm, 8-pin WSON with exposed thermal pad (DSG). Thermal pad must be soldered to VSS-connected PCB copper area for thermal reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input power supply terminal | Accepts 3.3–26 V DC; requires ≥0.1 µF ceramic bypass capacitor to VSS to suppress cable inductance spikes |
| VSS (Pin 2) | Ground reference | Primary ground return; internal connection to thermal pad - must be low-impedance PCB trace |
| PGATE (Pin 3) | External P-FET gate driver output | Drives gate of external P-channel MOSFET for reverse-polarity protection; clamped to VIN – 15 V max |
| NC (Pin 4) | No-connect terminal | Internally used for test; must remain unconnected on PCB to avoid interference with internal diagnostics |
| CE (Pin 5) | Chip enable input | Active-low control: CE = high disables FET; internal 200 kΩ pulldown allows floating for default-enable operation |
| VBAT (Pin 6) | Battery voltage sense input | Monitors pack voltage via high-impedance (10 nA bias) path; requires 100–470 kΩ series resistor for fault isolation |
| ILIM (Pin 7) | OCP threshold programming input | Connects to VSS via resistor to raise OCP threshold; supports precise current limiting from 700 mA to 1.5 A |
| OUT (Pin 8) | Regulated output terminal | Delivers 5 V to charging circuit; requires ≥1 µF ceramic capacitor to VSS for OVP transient immunity and decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent protection | Simultaneous monitoring of input voltage, input current, and battery voltage - each with dedicated comparators, timers, and hysteresis |
| Soft-stop OVP/OCP response | Controlled FET turn-off slope prevents voltage ringing during fault events - critical for EMI-sensitive mobile RF sections |
| Programmable overcurrent limit | Adjustable OCP threshold via single external resistor (RILIM), enabling design reuse across 700 mA–1.5 A current classes |
| Reverse polarity tolerance | –30 V input survivability achieved via PGATE-driven external P-FET - eliminates need for bulky series diodes |
| Low quiescent current | 500 µA operating current enables always-on battery safety monitoring without draining backup power sources |
Applications
| Smartphone Charging Front-End | Bluetooth Headset Power Management |
|---|---|
|
Use Scenario: AC adapter connects to smartphone PCB where faulty 12-V supply could overvoltage Li+ cell or charger IC. IC Role / Device Role / Timing Role: BQ24308DSGR acts as first-line protector between adapter jack and bq2407x charger IC - responds within 1 µs to OVP, isolating battery before damage occurs. Use Value: Prevents catastrophic cell venting or charger IC latch-up by enforcing strict 6.3-V OVP ceiling and 4.35-V BVOVP guardband. |
Use Scenario: USB-powered headset experiences intermittent short-circuits during plug insertion or cable flexing. IC Role / Device Role / Timing Role: BQ24308DSGR serves as current-limited pass element - limits inrush to 700 mA for 5 ms, then shuts down if fault persists. Use Value: Enables robust hot-plug capability without requiring oversized capacitors or fuses, preserving compact form factor. |
| MP3 Player Battery Safety Module | PDA System Power Sequencing |
|
Use Scenario: Portable media player uses wall adapter and USB simultaneously; risk of backfeed or overvoltage from miswired source. IC Role / Device Role / Timing Role: BQ24308DSGR functions as intelligent OR-ing controller - blocks reverse current flow and enforces 5-V regulated output regardless of input source. Use Value: Eliminates need for discrete diode-OR solutions while providing tighter voltage regulation (±3%) than Schottky-based designs. |
Use Scenario: PDA boots from battery but accepts external power for extended runtime; must prevent battery discharge into adapter circuitry. IC Role / Device Role / Timing Role: BQ24308DSGR operates as controlled power switch - enables OUT only when IN > UVLO (2.7 V) and CE = low, with 8-ms deglitch to reject noise. Use Value: Guarantees clean power sequencing and prevents brown-out resets during adapter hot-swap transitions. |
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 |
|---|---|---|---|
| TPS259211DRCR | Single-channel eFuse with 2.7–18 V range, 5.5-A max, no battery OVP or PGATE output | Replaces only input OVP/OCP function; requires separate BVOVP circuit and reverse-protection FET driver | Select when higher current (≥2 A) and faster OCP response (<1 µs) are required, and battery monitoring is handled externally |
| BQ24315DSGR | Pin-compatible upgrade with enhanced 12-V OVP threshold, 2-A OCP, and improved thermal shutdown accuracy (±5 °C) | Direct drop-in replacement for legacy BQ24308DSGR designs needing higher input voltage margin or tighter thermal control | Choose for new designs targeting USB PD adapters or industrial chargers where 26-V max input is insufficient |
Compared with TPS259211DRCR, BQ24308DSGR integrates battery voltage monitoring and reverse-polarity drive - reducing BOM count by two ICs. Against BQ24315DSGR, it offers lower cost and proven field reliability in consumer-grade 5-V adapter systems, though with narrower OVP headroom.
Availability
BQ24308DSGR is available at Aetrix Electronics and suitable for mobile phones, Bluetooth headsets, MP3 players, and low-power handheld devices requiring stable component supply with full lifecycle support and consistent parametric performance across production batches.
Supply support for BQ24308DSGR 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 safety and portable power solutions.
The BQ24308DSGR belongs to TI's battery front-end protection product line, engineered specifically for cost-sensitive, space-constrained Li-ion charging systems where triple-fault coverage (OVP/OCP/BVOVP) and minimal external components are mandatory.
FAQ
What protection functions does the BQ24308DSGR provide?
The BQ24308DSGR provides three independent protection functions: input overvoltage (6.3 V threshold), input overcurrent (700 mA typical, programmable), and battery overvoltage (4.35 V). It also includes thermal shutdown at 145 °C, undervoltage lockout at 2.7 V, and reverse-polarity protection via its PGATE output driving an external P-FET - all integrated into a single 2 mm × 2 mm WSON-8 package.
How is the overcurrent threshold adjusted on the BQ24308DSGR?
The overcurrent threshold of the BQ24308DSGR is adjusted using an external resistor (RILIM) connected between Pin 7 (ILIM) and VSS. The programmed threshold follows IOCP(program) = 700 mA + 25 kΩ / RILIM. For example, a 31 kΩ resistor raises the threshold to approximately 1.5 A. This allows precise current limiting tailored to specific adapter and system requirements without changing the IC.
Can the BQ24308DSGR be used without an external P-FET?
Yes, the BQ24308DSGR operates fully without an external P-FET - it provides input OVP, OCP, and battery OVP protection using its internal FET. The PGATE output is optional and only required when reverse-polarity protection up to –30 V is needed. If reverse polarity is not a concern, PGATE can be left unconnected and the device functions as a standalone protection IC with 5 V regulated output.
What is the purpose of the VBAT pin on the BQ24308DSGR?
The VBAT pin on the BQ24308DSGR senses battery voltage to enforce 4.35 V battery overvoltage protection. It draws only 10 nA bias current, so it must be connected through a 100–470 kΩ resistor (RBAT) to the battery positive terminal - preventing hazardous 30-V fault voltages from reaching the cell if the IC fails. If battery OVP is unused, VBAT should be tied directly to VSS.
Does the BQ24308DSGR require external capacitors, and if so, what values?
Yes, the BQ24308DSGR requires two external ceramic capacitors: a minimum 0.1 µF capacitor between IN and VSS (close to Pin 1), and a minimum 1 µF capacitor between OUT and VSS (close to Pin 8). These are mandatory for stability, EMI suppression, and proper OVP transient response - omitting them degrades protection timing and may cause false triggering or latch-up during input transients.
BQ24308DSGR 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)
BQ24308DSGR FAQ
1.How can I place an order for BQ24308DSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24308DSGR 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 BQ24308DSGR reliable?
The price and inventory of BQ24308DSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24308DSGR is usually 5 days.
3.What payment methods are accepted for BQ24308DSGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24308DSGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24308DSGR?
BQ24308DSGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24308DSGR 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 BQ24308DSGR?
For technical support, including BQ24308DSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24308DSGR requirements.
6.How does Aetrix verify that BQ24308DSGR is sourced from the original manufacturer or authorized distributors?
All BQ24308DSGR 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 BQ24308DSGR meets industry standards.
7.What is the process for return or replacement of BQ24308DSGR?
All BQ24308DSGR units undergo pre-shipment inspection (PSI). If there is an issue with BQ24308DSGR, 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 BQ24308DSGR part is unused and in its original packaging.
Return procedure for BQ24308DSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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