Texas Instruments BQ24314CDSGT

Overview

BQ24314CDSGT from Texas Instruments is a Li-ion battery front-end protection IC that provides integrated overvoltage, overcurrent, and battery overvoltage protection in a single 8-pin WSON package. It features 5.85 V input overvoltage threshold, 1.0 A programmable input current limit (with 24.9 kΩ R_ILIM), 4.45 V battery overvoltage cutoff, <1 µs OVP response time, and thermal shutdown at 140°C - deployed in smartphone charging paths to isolate faulty adapters before damage occurs.

For engineers reviewing the BQ24314CDSGT datasheet, BQ24314CDSGT pinout, BQ24314CDSGT application, or BQ24314CDSGT equivalent, key selection considerations include its bidirectional reverse-current capability (OUT→IN), user-programmable OCP via ILIM resistor, open-drain FAULT signaling for host microcontroller integration, and robust false-trigger immunity against input transients in portable power systems.

Technical Context

The BQ24314CDSGT implements three independent protection loops: input overvoltage detection with sub-microsecond FET turn-off, programmable input overcurrent limiting using an external resistor on ILIM, and fixed-threshold battery overvoltage monitoring with 280 mV hysteresis. Each fault condition drives the open-drain FAULT pin low and disables the internal N-channel pass FET.

It operates in three functional modes: POWER-DOWN (IN < 2.7 V UVLO), OPERATION (normal forward conduction with real-time monitoring), and POWER-ON RESET (with 8 ms deglitch delay). The CE pin enables host-controlled enable/disable with automatic reset of internal fault counters, and the device supports reverse current flow from OUT to IN when V_OUT exceeds UVLO + 0.7 V - critical for accessory-powering use cases.

Key Specifications

Pinout & Package

Package: 8-pin WSON (DSG) with 2.00 mm × 2.00 mm body size and exposed thermal pad electrically connected to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS259210DRCR and BQ24315DSGR, the BQ24314CDSGT uniquely combines Li+-specific battery overvoltage detection, reverse-current capability, and sub-microsecond OVP response in a 2×2 mm package - making it optimal for space-constrained consumer electronics where battery safety and accessory power sharing are co-required.

Availability

BQ24314CDSGT is available at Aetrix Electronics and suitable for smartphone charging protection, Bluetooth headset power delivery, MP3 player battery safety, and low-power PDA system protection requiring stable component supply across production lifecycles.

Supply support for BQ24314CDSGT 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 power management and battery safety solutions.

The BQ24314CDSGT belongs to TI's battery front-end protection IC product line, engineered specifically for safeguarding Li-ion cells against adapter faults, overcurrent events, and thermal hazards in portable consumer electronics.

FAQ

What protection functions does the BQ24314CDSGT provide?

The BQ24314CDSGT provides four hardware-enforced protection functions: input overvoltage (5.85 V threshold), input overcurrent (programmable 300–1500 mA), battery overvoltage (4.45 V cutoff), and thermal shutdown (140°C). Each condition disables the internal pass FET and pulls the FAULT pin low. The BQ24314CDSGT integrates all these functions into a single 2×2 mm WSON package without requiring external controllers or discrete components.

How is the input overcurrent threshold set on the BQ24314CDSGT?

The input overcurrent threshold on the BQ24314CDSGT is set by connecting an external resistor (R_ILIM) between the ILIM pin and VSS. Using the formula IOCP ≈ 25 / R_ILIM (with current in amperes and resistance in kΩ), a 24.9 kΩ resistor yields ~1.0 A limit. R_ILIM must be between 15 kΩ and 90 kΩ to ensure valid operation. The BQ24314CDSGT monitors current continuously and initiates blanking and recovery timing based on this programmed value.

Can the BQ24314CDSGT support reverse current flow from OUT to IN?

Yes, the BQ24314CDSGT supports reverse current flow from OUT to IN when V_OUT exceeds UVLO + 0.7 V (~3.4 V), enabling accessory power delivery (e.g., smartphone powering a headset). In this mode, the internal FET conducts bidirectionally with the same 1.5 A current rating, but overcurrent protection is disabled in the reverse direction. The BQ24314CDSGT maintains full forward-direction protection while allowing seamless accessory use without additional switches.

What is the role of the VBAT pin on the BQ24314CDSGT?

The VBAT pin on the BQ24314CDSGT senses battery voltage for overvoltage protection. It must be connected to the battery pack's positive terminal through an external resistor (recommended 100 kΩ) to limit fault current if the IC fails. This resistor introduces negligible error (<1 mV) while preventing hazardous 30 V from reaching the battery. If battery overvoltage protection is not needed, the VBAT pin should be tied directly to VSS - a configuration explicitly supported in the BQ24314CDSGT datasheet.

How does the CE pin affect fault handling in the BQ24314CDSGT?

The CE pin on the BQ24314CDSGT is an active-low enable input that resets internal fault counters (OCP and BVOVP) when toggled. When CE is high, the FET is disabled and FAULT enters high-impedance state; when CE is pulled low, the device resumes monitoring and will assert FAULT on any fault condition. This allows host processors to clear accumulated fault counts and re-enable protection after corrective action - a critical feature for field-recoverable systems using the BQ24314CDSGT.