Texas Instruments BQ24316DSGR

Overview

BQ24316DSGR 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 typical OCP (set via ILIM resistor), 4.35 V battery OVP, <1 μs OVP response, and integrated thermal shutdown. It serves as a safety-critical pass element controller between AC adapter and charging circuitry in smartphones and handheld devices.

For engineers reviewing the BQ24316DSGR datasheet, BQ24316DSGR pinout, BQ24316DSGR application, or BQ24316DSGR equivalent, this page delivers verified functional role, validated 8-pin WSON package mapping, confirmed protection timing specs (t_PD(OVP) = 1 μs, t_BLANK(OCP) = 176 μs), real-world fault indication behavior, and two field-validated alternative parts with documented differences.

Technical Context

The BQ24316DSGR implements three independent, concurrent protection loops: a fast analog comparator for input overvoltage (6.8 V threshold, <1 μs propagation delay), a current-sense amplifier with programmable threshold (via external ILIM resistor), and a precision bandgap-referenced battery voltage monitor (4.35 V ±25 mV). All protection events trigger an open-drain FAULT signal and disable the internal P-FET switch.

It operates in three functional modes: POWER-DOWN (IN < 2.7 V), POWER-ON RESET (with 8 ms deglitch time), and OPERATION (continuous monitoring). The CE pin enables host-controlled enable/disable with internal pulldown, and FAULT status is only active when CE = low - confirming strict logic dependency between control and reporting.

Key Specifications

Pinout & Package

Package: 8-pin WSON (DSG suffix), 2.0 mm × 2.0 mm body, 0.5 mm 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 BQ24314DSGR, the BQ24316DSGR provides higher input OVP margin critical for unregulated adapters, while TPS259211DSGR trades battery-specific protections for broader voltage range and current capacity - making it unsuitable as a drop-in replacement but viable for non-Li-ion systems.

Availability

BQ24316DSGR is available at Aetrix Electronics and suitable for smartphone charging protection, Bluetooth headset power path management, MP3 player input safety, and PDA battery overvoltage guard applications requiring stable component supply across production lifecycles.

Supply support for BQ24316DSGR 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 specializing in analog and embedded processing technologies, with leadership in power management and battery interface solutions.

The BQ24316DSGR belongs to TI's bq2431x family of Li-ion front-end protection ICs, designed specifically to safeguard portable electronics against input overvoltage, overcurrent, and battery overvoltage faults in space-constrained, safety-critical applications.

FAQ

What is the exact input overvoltage protection threshold for BQ24316DSGR?

The BQ24316DSGR has a guaranteed input overvoltage protection threshold of 6.6 V minimum, 6.8 V typical, and 7.0 V maximum - a specification unique to the bq24316 variant and distinct from the bq24314's 5.71–6.0 V range. This higher threshold enables robust operation with 5 V ±20% adapters and transient margin. The BQ24316DSGR datasheet SLUS763D explicitly defines these values in Section 6.5 under "INPUT OVERVOLTAGE PROTECTION".

How does BQ24316DSGR handle input overcurrent events?

The BQ24316DSGR implements a two-phase overcurrent response: first, it limits current at the programmed IOCP threshold (e.g., 1 A with 25 kΩ ILIM resistor) for 176 μs (blanking time); if the overcurrent persists beyond that, it turns off the internal FET for 64 ms (recovery time) and asserts FAULT low. The BQ24316DSGR repeats this cycle up to 15 times per charge cycle before latching off permanently - a behavior confirmed in Section 7.3.3.2 of the official datasheet.

Can BQ24316DSGR be used without a microcontroller?

Yes, the BQ24316DSGR can operate autonomously without a microcontroller: its CE pin has an internal pulldown resistor, so leaving CE unconnected defaults to enabled operation. All protection functions - input OVP, OCP, battery OVP, and thermal shutdown - activate automatically upon valid input voltage (IN > 2.7 V). The FAULT pin remains high-impedance during normal operation and only pulls low during faults, requiring only an external pull-up resistor for basic status indication.

What is the purpose of the VBAT pin on BQ24316DSGR and how should it be connected?

The VBAT pin on BQ24316DSGR senses battery voltage for overvoltage protection and must be connected through a 100–470 kΩ resistor (RBAT) to the battery positive terminal - never directly. This resistor limits fault current if the IC fails and IN voltage appears on VBAT (up to 30 V). With RBAT = 100 kΩ, worst-case current is 246 μA, and voltage drop is <1 mV - preserving BVOVP accuracy. Direct connection violates TI's safety recommendation in Section 8.2.2.1 of the BQ24316DSGR datasheet.

Does BQ24316DSGR provide reverse current blocking?

No, the BQ24316DSGR does not provide reverse current blocking. Its internal P-FET is configured as a high-side switch between IN and OUT, conducting only from IN to OUT. When disabled (CE high or fault condition), the FET turns off and blocks forward current, but it offers no protection against reverse current flow from OUT to IN - a scenario not addressed by the device's protection architecture. System-level reverse-blocking diodes or dedicated load switches must be added externally if required.