Texas Instruments BQ24314ADSGT

Overview

BQ24314ADSGT from Texas Instruments is a Li-ion battery front-end protection IC that provides simultaneous input overvoltage (OVP), user-programmable input overcurrent (OCP), and battery overvoltage (BVOVP) protection in a single 2×2 mm WSON-8 package. It features 5.85 V typical OVP threshold, 1.0 A typical OCP threshold (set via external R_ILIM), and 4.35 V fixed BVOVP threshold, with <200 ns OVP response time - deployed in mobile phones, Bluetooth headsets, and MP3 players to safeguard charging circuits from adapter faults.

For engineers reviewing the BQ24314ADSGT datasheet, BQ24314ADSGT pinout, BQ24314ADSGT application, or BQ24314ADSGT equivalent, key selection considerations include its 30 V absolute max input rating, 170–280 mV dropout voltage at 1 A, thermal shutdown at 140°C, open-drain FAULT signaling, and CE-controlled enable/disable functionality for system-level fault management.

Technical Context

The BQ24314ADSGT integrates three independent protection channels: an ultrafast comparator-based OVP circuit (<200 ns propagation delay), a programmable current-sense amplifier with blanking timer (t_BLANK(OCP) = 176 µs) and recovery delay (t_REC(OCP) = 64 ms), and a precision bandgap-referenced BVOVP detector with 275 mV hysteresis. All protections drive a shared open-drain FAULT pin and disable the internal 28 mΩ N-channel pass FET (Q1).

Its functional modes include OPERATION (continuous monitoring with soft-start), POWER-DOWN (UVLO <2.7 V), and POWER-ON RESET (with 8 ms deglitch timer). The device supports reverse current flow from OUT to IN when V_OUT > UVLO + 0.7 V, enabling accessory power delivery without diode loss - though reverse-direction OCP is not implemented.

Key Specifications

Pinout & Package

Package: 8-pin WSON (DSG) with 2.00 mm × 2.00 mm body and exposed thermal pad electrically connected to VSS. Requires solder paste stencil optimization and thermal via array under pad for reliable 125°C continuous operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS259210DRCR and BQ24315DRVT, the BQ24314ADSGT uniquely combines input OVP/OCP, battery OVP, and thermal shutdown in a 2×2 mm footprint - making it the sole option when all three protections must coexist without external components or secondary monitoring.

Availability

BQ24314ADSGT is available at Aetrix Electronics and suitable for mobile phones, Bluetooth headsets, and MP3 players requiring stable component supply across extended production lifecycles and varying regional adapter standards.

Supply support for BQ24314ADSGT 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, with decades of expertise in battery safety and portable power solutions.

The BQ24314ADSGT belongs to TI's battery front-end protection IC product line, engineered specifically to eliminate single-point failures in Li-ion charging paths for space-constrained consumer electronics.

FAQ

What protection functions does the BQ24314ADSGT provide?

The BQ24314ADSGT provides four concurrent protection functions: input overvoltage (OVP) with <200 ns response, user-programmable input overcurrent (OCP) via R_ILIM, battery overvoltage (BVOVP) at 4.35 V, and thermal shutdown at 140°C. All faults trigger the open-drain FAULT pin and disable the internal pass FET, isolating the battery from hazardous conditions. The BQ24314ADSGT integrates these into one monolithic IC without external comparators or timers.

How is the overcurrent threshold set on the BQ24314ADSGT?

The overcurrent threshold of the BQ24314ADSGT is set by connecting an external resistor R_ILIM between Pin 7 (ILIM) and VSS. The relationship is approximated by I_OCP ≈ 25 / R_ILIM (in kΩ), yielding a programmable range from 300 mA to 1.5 A. For example, a 24.9 kΩ resistor sets I_OCP to ~1.0 A. The BQ24314ADSGT includes a 176 µs blanking window to ignore startup surges, followed by 64 ms recovery delay after persistent overcurrent.

Can the BQ24314ADSGT support reverse current flow from OUT to IN?

Yes, the BQ24314ADSGT supports controlled reverse current flow from OUT to IN when V_OUT > UVLO + 0.7 V (~3.4 V), enabling accessory power delivery (e.g., phone powering a headset). In this mode, the internal FET conducts bidirectionally with the same 1.5 A forward rating, minimizing voltage drop versus a discrete diode. However, the BQ24314ADSGT does not provide overcurrent protection in the reverse direction - only forward OCP is active.

What is the recommended layout practice for the thermal pad on the BQ24314ADSGT?

The exposed thermal pad on the BQ24314ADSGT must be soldered to a dedicated VSS copper pour with ≥4 thermal vias (0.3 mm diameter, spaced ≤1 mm apart) connecting to inner-layer ground planes. Do not rely solely on the VSS pin for grounding - the thermal pad is electrically tied to VSS internally and is essential for achieving the specified R_θJB = 33.9°C/W. Poor thermal pad soldering causes junction temperature to exceed 125°C under 1.5 A load, triggering premature thermal shutdown in the BQ24314ADSGT.

Does the BQ24314ADSGT require external components for basic operation?

Yes, the BQ24314ADSGT requires three mandatory external components: a ≥1 µF ceramic capacitor from IN to VSS, another ≥1 µF ceramic capacitor from OUT to VSS, and a resistor from ILIM to VSS to set OCP. Optional components include a 100 kΩ resistor from VBAT to battery+ for safety isolation and pull-up resistors for CE and FAULT. No external MOSFETs, comparators, or timing capacitors are needed - all protection logic is self-contained within the BQ24314ADSGT.