Texas Instruments BQ24314ADSGRG4

Overview

BQ24314ADSGRG4 from Texas Instruments is a Li-ion battery front-end protection IC that provides input overvoltage (OVP), user-programmable input overcurrent (OCP), and battery overvoltage (BVOVP) protection in a single 8-pin WSON package. It features 5.85 V typical OVP threshold, 1.0 A typical OCP threshold with 24.9 kΩ ILIM resistor, 4.35 V BVOVP threshold, <1 µs OVP response time, and thermal shutdown at 140°C - deployed in mobile phones and Bluetooth headsets to safeguard charging circuits from adapter faults.

For engineers reviewing the BQ24314ADSGRG4 datasheet, BQ24314ADSGRG4 pinout, BQ24314ADSGRG4 application, or BQ24314ADSGRG4 equivalent, key selection considerations include its 30 V absolute max input voltage, 1.5-A continuous input current capability, programmable OCP via external resistor, open-drain FAULT signaling, and enable-controlled power gating for system-level fault management and host processor coordination.

Technical Context

The BQ24314ADSGRG4 integrates three independent protection channels: an ultra-fast comparator-based OVP circuit with <200 ns propagation delay and 60 mV hysteresis; a current-sense amplifier and blanking-timer controlled OCP loop where threshold is set by R_ILIM (15–90 kΩ range); and a precision bandgap-referenced BVOVP detector with 275 mV hysteresis and deglitch timing of 176 µs. All fault events drive the open-drain FAULT pin low and disable the internal N-channel pass FET Q1.

It operates in three functional modes: POWER-DOWN (IN < UVLO = 2.7 V), OPERATION (safe input/battery conditions), and PROTECTION (OVP/OCP/BVOVP/thermal fault). The CE pin enables full system control - disabling resets internal counters and forces FAULT into high-impedance state - while soft-start and deglitch timers (8 ms PGOOD, 64 ms OCP recovery) prevent false triggering during transients.

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. Requires solder paste stencil design per TI SLOA109 for reliable thermal pad attachment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24314ADSGRG4, BQ24315DSGR offers higher OVP and BVOVP thresholds for less aggressive protection margins, while TPS259211DRCR provides broader input voltage support but omits battery-side monitoring - making BQ24314ADSGRG4 uniquely suited for integrated Li-ion charging front-ends demanding all-three-protection coverage.

Availability

BQ24314ADSGRG4 is available at Aetrix Electronics and suitable for smartphone charging protection, Bluetooth headset power management, MP3 player battery safety, PDA system-level fault isolation, and low-power handheld device designs requiring stable component supply and long-term lifecycle support.

Supply support for BQ24314ADSGRG4 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The BQ24314ADSGRG4 belongs to TI's battery management IC portfolio, specifically designed to provide integrated front-end protection for single-cell Li-ion systems - addressing reliability, safety certification, and space constraints in portable consumer electronics.

FAQ

What protection functions does the BQ24314ADSGRG4 provide?

The BQ24314ADSGRG4 provides four distinct protection functions: input overvoltage (OVP) with <200 ns response, user-programmable input overcurrent (OCP) via ILIM resistor, battery overvoltage (BVOVP) at 4.35 V, and thermal shutdown at 140°C. Each fault condition disables the internal pass FET and pulls the FAULT pin low. The BQ24314ADSGRG4 does not provide undervoltage lockout (UVLO) as a protection function - UVLO (2.7 V) is only used for power-on reset sequencing.

How is the overcurrent threshold set on the BQ24314ADSGRG4?

The overcurrent threshold on the BQ24314ADSGRG4 is set by connecting an external resistor R_ILIM between the ILIM pin and VSS. The relationship is IOCP ≈ 25 ÷ R_ILIM (with current in amperes and resistance in kΩ). For example, a 24.9 kΩ resistor yields ~1.0 A typical trip point. R_ILIM must be between 15 kΩ and 90 kΩ to ensure valid operation across temperature and process variation - values outside this range may cause unreliable OCP behavior in the BQ24314ADSGRG4.

Can the BQ24314ADSGRG4 support reverse current flow for accessory power?

Yes, the BQ24314ADSGRG4 supports reverse current flow from OUT to IN when VOUT exceeds UVLO + 0.7 V (~3.4 V), enabling accessory power delivery (e.g., USB OTG or headset charging) through the same port. In this mode, the internal FET conducts bidirectionally with the same 1.5-A forward current rating, but no overcurrent protection is active in reverse direction. This capability is explicitly documented in the BQ24314ADSGRG4 datasheet Section 9.1.1 and requires proper host control via CE pin to manage directionality.

What is the role of the VBAT pin on the BQ24314ADSGRG4?

The VBAT pin on the BQ24314ADSGRG4 is a high-impedance battery voltage sense input used exclusively for battery overvoltage protection (BVOVP). It monitors the pack voltage and triggers FET shutdown if it exceeds 4.35 V. TI strongly recommends connecting VBAT through a 100 kΩ series resistor to prevent hazardous current injection during internal failure - direct connection risks exposing the battery to up to 30 V. If BVOVP is not required, VBAT must be tied to VSS, not left floating, per BQ24314ADSGRG4 design guidelines.

Does the BQ24314ADSGRG4 require external components for basic operation?

Yes, the BQ24314ADSGRG4 requires at minimum two external components for guaranteed operation: a ≥1 µF ceramic capacitor from IN to VSS and another ≥1 µF ceramic capacitor from OUT to VSS - both placed adjacent to their respective pins. Additionally, an R_ILIM resistor is mandatory to set OCP threshold, and a pull-up resistor on FAULT is required for host monitoring. Optional components include R_CE for GPIO-controlled enable and R_BAT for safe VBAT connection - all specified in the BQ24314ADSGRG4 typical application circuit (Figure 13).