Texas Instruments BQ24304DSGR

Overview

BQ24304DSGR from Texas Instruments is a Li-ion battery front-end protection IC designed for USB/AC adapter-powered portable devices. It provides integrated input overvoltage (10.5 V), input overcurrent (300 mA), and battery overvoltage (4.35 V) protection with 4.5 V regulated output, thermal shutdown, and enable control - deployed in Bluetooth headsets and low-power handhelds.

For engineers reviewing the BQ24304DSGR datasheet, BQ24304DSGR pinout, BQ24304DSGR application, or BQ24304DSGR equivalent, this device serves as a dedicated safety monitor between power source and Li+ charger ICs - requiring attention to VBAT sensing resistor selection, PGATE external P-FET drive, and OVP/OCP blanking timing for robust transient immunity.

Technical Context

The BQ24304DSGR operates as a linear regulator with fixed 4.5 V output regulation (VO(REG)) up to 250 mA load, using an internal N-channel FET (Q1) between IN and OUT. It continuously monitors VIN, IIN, and VBAT via dedicated comparators with deglitch timers (tDGL(PGOOD) = 8 ms, tDGL(BOVP) = 176 μs) and blanking windows (tBLANK(OVP) = 64 μs, tBLANK(OCP) = 5 ms) to reject false triggers from voltage spikes or current transients.

Protection logic includes soft-start at power-on, soft-stop during fault shutdown, and thermal shutdown at TJ = 150 °C with 20 °C hysteresis. The CE pin enables host-controlled disable (active-low), while PGATE drives an external P-channel MOSFET for optional reverse-polarity protection up to –30 V, with gate clamp at 15 V (VGCLMP).

Key Specifications

Pinout & Package

Package: 2 mm × 2 mm WSON (DSG) with PowerPAD™ thermal pad connected internally to VSS. Requires PCB copper pad tied to ground plane via ≥6 thermal vias for reliable thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24304DSGR, BQ24300DSGR delivers 1.0 V higher regulated output for legacy charger compatibility, while BQ24305DSGR offers mid-point 5.0 V regulation with ±150 mV tolerance - all three share identical protection logic, timing, and thermal behavior, enabling direct substitution where output voltage aligns with downstream requirements.

Availability

BQ24304DSGR is available at Aetrix Electronics and suitable for Bluetooth headsets, USB-powered medical sensors, and ruggedized handheld scanners requiring stable component supply with guaranteed long-term lifecycle support.

Supply support for BQ24304DSGR 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 - serving automotive, industrial, and personal electronics markets with high-reliability silicon solutions.

The BQ24304DSGR belongs to TI's bq2430x family of Li+ battery front-end protection ICs, engineered specifically to replace discrete OVP/OCP circuits in space- and cost-sensitive portable chargers - emphasizing robustness against real-world adapter faults and thermal stress.

FAQ

What is the primary function of the BQ24304DSGR in a Li+ charging system?

The BQ24304DSGR acts as a dedicated safety monitor between the power source (USB/AC adapter) and the main charger IC. It continuously checks input voltage, input current, and battery voltage - shutting down the power path within microseconds if any parameter exceeds safe limits. Its core role is preventing overvoltage, overcurrent, and overcharge damage to the Li+ cell and downstream circuitry, making it essential for certified portable electronics.

Can the BQ24304DSGR be used without an external P-channel MOSFET?

Yes, the BQ24304DSGR functions fully without an external P-FET - providing input overvoltage, input overcurrent, and battery overvoltage protection using its internal N-channel FET. The PGATE pin remains inactive unless the external FET is added for reverse-polarity protection. In standard configurations, IN connects directly to the adapter, OUT feeds the charger IC, and VBAT senses the battery through a series resistor - no P-FET required for basic protection.

What is the recommended value for the RBAT resistor on the BQ24304DSGR VBAT pin?

Texas Instruments recommends RBAT between 100 kΩ and 470 kΩ. A 100 kΩ resistor limits fault current to ≤270 μA if the IC fails with 30 V on IN, while introducing only ~1 mV error in the 4.35 V battery overvoltage threshold - well within the device's ±50 mV tolerance. Values above 470 kΩ increase BVOVP measurement error; below 100 kΩ risk excessive fault current into the battery during failure modes.

How does the BQ24304DSGR handle input voltage transients like ESD or cable ringback?

The BQ24304DSGR uses dual-stage immunity: hardware-level robustness (15 kV IEC 61000-4-2 contact ESD rating on IN) plus timing-based filtering. Its 64 μs OVP blanking window ignores sub-64 μs spikes, while the 8 ms power-on deglitch timer prevents false triggering during initial adapter connection. This combination allows it to tolerate typical USB cable inductance-induced ringback (e.g., 12 V overshoot for <50 μs) without disrupting charging.

Is the BQ24304DSGR pin-compatible with other devices in the bq2430x family?

Yes, the BQ24304DSGR shares identical 8-pin WSON (DSG) package, pinout, and electrical interface with BQ24300DSGR and BQ24305DSGR - differing only in output regulation voltage (4.5 V vs. 5.5 V or 5.0 V) and marking. All three use the same PCB footprint, thermal pad layout, and external component values (CIN, COUT, RBAT), enabling drop-in replacement when output voltage requirements change across product variants.