Texas Instruments BQ24300DSGR

Overview

BQ24300DSGR from Texas Instruments is a Li-ion battery front-end protection IC that functions as a voltage-regulated, current-limited linear switch for AC adapter input. It provides input overvoltage (10.5 V typ), input overcurrent (300 mA typ), and battery overvoltage (4.35 V) protection with thermal shutdown. Designed for low-power handheld devices, it regulates output to 5.5 V and operates within 3.3–26 V input range.

For engineers reviewing the BQ24300DSGR datasheet, BQ24300DSGR pinout, BQ24300DSGR application, or BQ24300DSGR equivalent, key selection criteria include its 8-pin WSON package, integrated gate driver for external P-FET reverse-polarity protection, soft-start/soft-stop behavior, deglitch timing (8 ms PGOOD, 64 μs OVP blanking), and LDO-mode regulation at 5.5 V.

Technical Context

The BQ24300DSGR implements three independent protection loops-input overvoltage, input overcurrent, and battery overvoltage-each with dedicated comparators, hysteresis, and deglitch timers. Its internal linear FET (Q1) is controlled via analog feedback and digital state logic, enabling regulated output (5.5 V) below OVP threshold and rapid shutdown above 10.5 V with 64 μs blanking.

Operation includes UVLO (2.7 V typ), CE-controlled enable/disable with internal pull-down, PGATE-driven external P-FET for reverse-polarity protection up to –30 V, and thermal shutdown at 150 °C with 20 °C hysteresis. All protections feature soft-stop gate control to suppress voltage transients during fault recovery.

Key Specifications

Pinout & Package

Package: 2 mm × 2 mm WSON-8 (DSG) with exposed thermal pad connected internally to VSS; requires PCB copper pad and thermal vias for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24305DSGR and BQ24304DSGR, the BQ24300DSGR provides the highest regulated output voltage (5.5 V), making it optimal for systems requiring maximum headroom before downstream LDOs or buck converters-critical for maintaining charger IC functionality across aging adapters and cable losses.

Availability

BQ24300DSGR is available at Aetrix Electronics and suitable for Bluetooth headsets, low-power handheld devices, and USB-powered portable instruments requiring stable component supply with full production traceability and long-term lifecycle support.

Supply support for BQ24300DSGR 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 and embedded processing technologies, with decades of expertise in battery management and power protection solutions.

The bq2430x family was designed specifically as front-end protection ICs for Li-ion charging systems, integrating triple-fault monitoring, thermal safety, and gate-driving capability into a miniature WSON package for space-constrained portable electronics.

FAQ

What is the primary function of the BQ24300DSGR in a Li-ion charging system?

The BQ24300DSGR serves as a front-end protection IC that sits between the AC adapter input and the main charger IC (e.g., bq24080). It continuously monitors input voltage, input current, and battery voltage to prevent damage from overvoltage, overcurrent, and battery overcharge conditions. The BQ24300DSGR regulates the output to 5.5 V and shuts down the internal FET upon fault detection, ensuring safe and reliable power delivery to downstream circuitry.

Does the BQ24300DSGR require an external P-FET to operate?

No, the BQ24300DSGR operates fully functional without an external P-FET. Its internal linear FET handles basic overvoltage, overcurrent, and battery overvoltage protection. The PGATE pin is optional and only needed when implementing input reverse-polarity protection up to –30 V using an external P-channel MOSFET. In standard configurations, PGATE remains unused and can be left floating or tied to VSS.

What is the purpose of the VBAT pin on the BQ24300DSGR, and how should it be connected?

The VBAT pin on the BQ24300DSGR senses battery voltage to enable battery overvoltage protection (BVOVP) at 4.35 V. It must be connected to the Li-ion pack's positive terminal through a series resistor (100–470 kΩ) for safety-direct connection risks exposing the battery to up to 30 V during IC failure. This resistor limits fault current while introducing negligible voltage error (<1 mV) due to the pin's 10 nA bias current.

How does the BQ24300DSGR handle input voltage transients such as ESD or cable-induced ringing?

The BQ24300DSGR incorporates high-immunity design features including 8 ms deglitch timing on power-on (tDGL(PGOOD)), 64 μs blanking on overvoltage detection (tBLANK(OVP)), and soft-stop gate control to suppress voltage spikes. Its input structure withstands 15 kV air/8 kV contact ESD per IEC 61000-4-2 when properly bypassed with a 1 μF ceramic capacitor on the IN pin, making it robust against real-world adapter transients and hot-plug events.

Can the BQ24300DSGR be used with a 12 V input adapter?

Yes, the BQ24300DSGR supports input voltages up to 26 V, making it compatible with 12 V adapters. However, when VIN exceeds the 5.5 V regulation voltage, the device enters linear regulator mode until the input reaches the 10.5 V overvoltage threshold. At 12 V input, power dissipation in the internal FET increases significantly-designers must verify thermal performance using RθJA = 75 °C/W and ensure adequate PCB copper area and thermal vias to maintain junction temperature below 125 °C.