Texas Instruments BQ24080DRCT

Overview

BQ24080DRCT from Texas Instruments is a single-chip, 1-A linear Li-ion/Li-polymer battery charger IC with integrated power FET, current sensing, and dual open-drain status outputs (STAT1/STAT2). It delivers ±0.35% voltage regulation accuracy at 4.2 V, supports programmable charge current via external R_SET, and includes fixed 7-hour fast-charge safety timer and automatic sleep mode. It is designed for space-constrained portable devices such as MP3 players and digital cameras.

For engineers reviewing the BQ24080DRCT datasheet, BQ24080DRCT pinout, BQ24080DRCT application, or BQ24080DRCT equivalent, key selection considerations include its VSON-10 package footprint, 350–500 mV dropout at 1 A, precharge-to-fast-charge transition at 2.8–3.2 V, termination detection via ISET pin voltage (235–265 mV), and absence of temperature sensing-distinguishing it from the bq24081 variant.

Technical Context

The BQ24080DRCT implements a three-phase charging algorithm-preconditioning, constant-current, and constant-voltage-with minimum-current-based termination and a backup 7-hour safety timer. Its internal power FET regulates output current using an external resistor on the ISET pin, where V_SET = 2.463–2.538 V and K_SET = 307–337 mA/V define the current scaling relationship.

It features dedicated CE (charge enable) and PG (power-good) pins but omits TS (temperature sense) and TE (timer enable), confirming its role as the base variant in the bq2408x family. The device enters sleep mode when input power is removed, drawing only 2–5 μA, and uses OUT pin feedback for battery voltage monitoring with V_RCH = VO(REG) − 0.10 to −0.085 V for recharge initiation.

Key Specifications

Pinout & Package

Package: 10-pin VSON (DRC), 3.00 mm × 3.00 mm, exposed thermal pad electrically connected to VSS.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Li-ion linear charger applications.

Compared with BQ24081DRCT, BQ24080DRCT trades temperature safety for simpler layout and added PG signaling; versus TP4056, it delivers tighter voltage regulation, integrated status outputs, and hardware-enforced safety timers-making it suitable for higher-reliability portable systems.

Availability

BQ24080DRCT is available at Aetrix Electronics and suitable for MP3 players, digital cameras, and PDAs requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for BQ24080DRCT 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 specializing in analog and embedded processing technologies, with leadership in power management ICs for portable and industrial applications.

The bq2408x product line was engineered for space-constrained, single-cell Li-ion charging in consumer portables-emphasizing integration, accuracy, and autonomous operation without host processor intervention.

FAQ

What is the function of the PG pin on the BQ24080DRCT?

The PG (Power-Good) pin on the BQ24080DRCT is an open-drain output that pulls low when a valid input voltage (≥4.5 V) is present on the IN pin. It remains high-impedance during sleep mode. This signal allows the host system to detect adapter presence without polling, enabling intelligent power-path decisions. The BQ24080DRCT uses PG for real-time input validation-unlike the bq24081DRCT, which replaces PG with TS functionality.

How does the BQ24080DRCT handle deeply discharged batteries?

The BQ24080DRCT initiates preconditioning when the battery voltage on the OUT pin falls below 2.8–3.2 V, applying a reduced precharge current (2–100 mA) set by the same R_SET resistor used for fast-charge. This phase continues until the battery reaches the threshold or the 1,800-second precharge timer expires. The BQ24080DRCT ensures safe revival of cells down to 2.0 V without external circuitry, preventing lithium plating during recovery.

Can the BQ24080DRCT be used without connecting the CE pin?

Yes-the CE pin on the BQ24080DRCT defaults to active-low enable, so leaving it unconnected (floating) is not recommended. TI specifies tying CE to GND via a pull-down resistor or directly to VSS to ensure reliable startup. If left floating, noise may cause erratic enable/disable behavior. The BQ24080DRCT requires a defined logic state on CE for deterministic operation; defaulting to enabled via GND connection is standard practice per the datasheet.

What is the maximum allowable input voltage for the BQ24080DRCT?

The absolute maximum input voltage on the IN pin of the BQ24080DRCT is 7 V, but the recommended operating range is 4.5–6.5 V per the datasheet. Exceeding 6.5 V risks violating thermal limits due to increased power dissipation in the internal pass FET, especially at high charge currents. The BQ24080DRCT's 350–500 mV dropout at 1 A means it requires ≥4.7 V input to sustain 4.2 V output under full load-making 5 V USB adapters ideal.

Does the BQ24080DRCT support battery temperature monitoring?

No-the BQ24080DRCT does not include a TS (temperature sense) pin or internal temperature qualification circuitry. That functionality is exclusive to the bq24081DRCT variant. The BQ24080DRCT relies on fixed voltage thresholds and timers for safety, making it appropriate for applications where ambient temperature is controlled or thermal monitoring is handled externally. Users requiring JEITA compliance must select the bq24081DRCT instead of the BQ24080DRCT.