Texas Instruments BQ24316DSGT

Overview

BQ24316DSGT 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 A programmable OCP (with 25 kΩ ILIM resistor), 4.35 V battery OVP, <1 μs OVP response, and thermal shutdown. It is used in smartphone and PDA charging paths to isolate faulty adapters before damage occurs.

For engineers reviewing the BQ24316DSGT datasheet, BQ24316DSGT pinout, BQ24316DSGT application, or BQ24316DSGT equivalent, this page delivers verified functional role, exact protection thresholds, real-world timing behavior (tPD(OVP) = 1 μs, tBLANK(OCP) = 176 μs), package-specific thermal metrics (RθJA = 58.6 °C/W), and validated alternative options for Li-ion charger front-end protection.

Technical Context

The BQ24316DSGT 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 ±15 mV). All protections drive a single open-drain FAULT output.

It operates in three functional modes: POWER-DOWN (IN < 2.7 V), POWER-ON RESET (with 8 ms deglitch time), and OPERATION (continuous monitoring with soft-start and fault latching). The CE pin enables host-controlled enable/disable, resetting internal OCP and Bat-OVP counters on re-enable.

Key Specifications

Pinout & Package

Package: 8-pin WSON (DSG), 2.0 mm × 2.0 mm body, exposed thermal pad electrically connected to VSS. Requires PCB thermal pad connection to ground plane for RθJA = 58.6 °C/W performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Li-ion charger front-end protection applications.

Compared with bq24314DSGT, BQ24316DSGT provides higher input OVP headroom for USB-PD and industrial adapters, while TPS259211DSGR offers broader OVP/OCP programmability but omits battery-side safety - making BQ24316DSGT the only option with integrated triple-protection for Li-ion charging front-ends.

Availability

BQ24316DSGT is available at Aetrix Electronics and suitable for smartphone charging circuits, Bluetooth headset power management, and PDA battery safety systems requiring stable component supply across production lifecycles.

Supply support for BQ24316DSGT 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, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The bq2431x product line was designed specifically for Li-ion battery front-end protection in portable devices, integrating input OVP, programmable OCP, and battery OVP into a single compact IC to replace discrete MOSFET + comparator solutions.

FAQ

What is the exact input overvoltage protection threshold for BQ24316DSGT?

The BQ24316DSGT has a fixed input overvoltage protection threshold of 6.8 V (typical), with min/max values of 6.6 V and 7.0 V across temperature and process variation. This value is specific to the bq24316 variant and differs from the bq24314's 5.85 V threshold. The BQ24316DSGT uses this higher threshold to accommodate USB-PD 9 V negotiation and industrial adapter tolerances while maintaining safe margin below its 30 V absolute maximum rating.

How does the BQ24316DSGT implement input overcurrent protection?

The BQ24316DSGT implements input overcurrent protection using an external resistor (RILIM) connected from the ILIM pin to VSS. The threshold is calculated as IOCP = 25 ÷ RILIM (with current in A and resistance in kΩ); for example, a 25 kΩ resistor sets IOCP = 1000 mA. When exceeded, the device limits current for 176 μs (blanking time), then turns off the internal FET if the condition persists, asserting FAULT low after 64 ms recovery delay. The BQ24316DSGT repeats this cycle up to 15 times before latching off.

Can BQ24316DSGT be used without connecting the VBAT pin?

No - the VBAT pin must not be left floating. If battery overvoltage protection is not required, the BQ24316DSGT VBAT pin must be connected directly to VSS. Leaving it unconnected risks undefined behavior and potential failure to detect battery faults. For functional Bat-OVP, TI mandates a series resistor (RBAT = 100–470 kΩ) between the battery pack and VBAT to limit fault current to <250 μA in case of internal IC failure, ensuring safety compliance per IEC 62368-1.

What is the thermal performance of BQ24316DSGT in its DSG package?

The BQ24316DSGT in the 8-pin WSON DSG package has a junction-to-ambient thermal resistance (RθJA) of 58.6 °C/W under standard JEDEC PCB conditions. Its junction-to-board (RθJB) is 29.7 °C/W, confirming strong thermal coupling to the PCB ground plane via the exposed thermal pad. To achieve rated 1.5 A operation continuously, the PCB must provide adequate copper area under the thermal pad; derating is required above 85 °C ambient unless forced airflow or enhanced layout is used. The BQ24316DSGT thermal shutdown activates at 140–150 °C with 20 °C hysteresis.

Is BQ24316DSGT pin-compatible with other devices in the bq2431x family?

Yes - the BQ24316DSGT is pin-compatible with the bq24314DSGT in the same DSG (8-pin WSON) package, sharing identical pinout, footprint, and thermal pad configuration. Both devices use Pins 1/2 for IN, Pin 4 for FAULT, Pin 5 for CE, Pin 6 for VBAT, Pin 7 for ILIM, and Pin 8 for OUT. However, the BQ24316DSGT's higher 6.8 V OVP threshold means direct substitution may require validation of adapter voltage margins and system-level fault response timing.