Texas Instruments BQ24316DSJR

Overview

BQ24316DSJR 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, 4.35 V battery OVP, <1 μs OVP response, and thermal shutdown. It is used in smartphone and PDA charging circuits to isolate faulty adapters before damage occurs.

For engineers reviewing the BQ24316DSJR datasheet, BQ24316DSJR pinout, BQ24316DSJR application, or BQ24316DSJR equivalent, key selection criteria include its 6.8 V input overvoltage protection threshold, 1 A programmable overcurrent limit, 4.35 V battery overvoltage cutoff, 8-pin VSON (3 mm × 4 mm) package, and open-drain FAULT output for host fault reporting.

Technical Context

The BQ24316DSJR integrates three independent protection channels: input overvoltage detection with sub-1-μs propagation delay, resistor-programmable input overcurrent limiting with 176 μs blanking time, and fixed 4.35 V battery overvoltage sensing. Its internal P-FET switch disconnects IN from OUT upon any fault condition.

Operation includes power-on reset with 8 ms deglitch timing, soft-start to suppress input ringing, and fault latching with 15-event counter before permanent shutdown. The CE pin enables host-controlled enable/disable with internal pulldown, and FAULT is an active-low open-drain status indicator shared across all four fault types.

Key Specifications

Pinout & Package

Package: 8-pin VSON (DSJ suffix), 3.0 mm × 4.0 mm body, 0.65 mm lead pitch, exposed thermal pad electrically connected to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24316DSJR, BQ24314DSGR offers lower OVP for tighter 5 V adapter tolerance but lacks the 6.8 V headroom needed for 9 V fast-charging adapters; TPS259211DDBVR provides higher current and adjustable OVP but omits battery voltage monitoring entirely-making it unsuitable as a drop-in replacement for Li-ion front-end protection.

Availability

BQ24316DSJR is available at Aetrix Electronics and suitable for smartphone charging circuits, PDA power management subsystems, and portable media player battery protection requiring stable component supply and long-term lifecycle support.

Supply support for BQ24316DSJR 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 BQ24316DSJR belongs to TI's battery management IC portfolio, designed specifically to safeguard Li-ion charging paths against adapter faults, overcurrent events, and battery overvoltage-enabling robust, certified-safe portable power architectures.

FAQ

What is the input overvoltage protection threshold of the BQ24316DSJR?

The BQ24316DSJR has a fixed input overvoltage protection threshold of 6.6 V minimum, 6.8 V typical, and 7.0 V maximum. This value is specific to the bq24316 variant and differs from the bq24314 (5.71–6.0 V). The threshold is internally trimmed and does not require external components. The BQ24316DSJR uses this threshold to immediately disable the internal FET within <1 μs if the IN pin voltage exceeds the limit.

How is the input overcurrent limit programmed on the BQ24316DSJR?

The input overcurrent limit on the BQ24316DSJR is programmed using an external resistor (RILIM) connected between the ILIM pin and VSS. The relationship follows IOCP ≈ 25 ÷ RILIM, where IOCP is in amperes and RILIM is in kilo-ohms. For example, a 25 kΩ resistor sets the threshold to approximately 1 A. The BQ24316DSJR supports a full range of 300 mA to 1500 mA using standard E24 resistor values between 15 kΩ and 90 kΩ.

Does the BQ24316DSJR provide battery overvoltage protection, and what is its threshold?

Yes, the BQ24316DSJR provides dedicated battery overvoltage protection with a fixed threshold of 4.30 V minimum, 4.35 V typical, and 4.40 V maximum. This function monitors the VBAT pin and disables the internal FET if the sensed battery voltage exceeds the threshold-preventing Li-ion cell overcharge. The BQ24316DSJR requires an external resistor (≥100 kΩ) between VBAT and battery+ for safety isolation, as specified in TI's application guidance.

What package type and dimensions does the BQ24316DSJR use?

The BQ24316DSJR uses the DSJ package: an 8-pin VSON (very thin small outline no-lead) measuring 3.0 mm × 4.0 mm with 0.65 mm lead pitch and an exposed thermal pad. This package is distinct from the DSG (WSON) variant used by the bq24314. The thermal pad must be soldered to a VSS-copper pour on the PCB, and pins 1 & 2 (IN) and pins 10 & 11 (OUT) must be shorted externally per TI's layout guidelines for the BQ24316DSJR.

How does the FAULT pin operate on the BQ24316DSJR?

The FAULT pin on the BQ24316DSJR is an active-low, open-drain output that goes low during any of four fault conditions: input overvoltage, input overcurrent, battery overvoltage, or thermal shutdown. It remains high-impedance when no fault is present or when the CE pin is high. The BQ24316DSJR requires an external pull-up resistor (typically 22–100 kΩ) to a host logic rail. Fault persistence triggers a 15-event counter; after 15 occurrences, the FET latches off until power cycle or CE toggle.