Texas Instruments BQ24083DRCT

Overview

BQ24083DRCT from Texas Instruments is a monolithic, 1-A linear Li-ion/Li-polymer battery charger IC with integrated power FET and current sensing. It delivers precise 4.06 V or 4.2 V charge voltage selection via VBSEL pin, supports precharge conditioning, constant-current/constant-voltage charging, and integrates 7-hour fast-charge safety timer - designed for space-constrained portable devices like smartphones and digital cameras.

For engineers reviewing the BQ24083DRCT datasheet, BQ24083DRCT pinout, BQ24083DRCT application, or BQ24083DRCT equivalent, key selection criteria include its adjustable battery voltage (4.06/4.2 V), programmable charge current (50–1000 mA via ISET resistor), open-drain STAT/PG status outputs, thermal shutdown (165°C), and 3-mm × 3-mm VSON-10 package with exposed thermal pad.

Technical Context

The BQ24083DRCT implements a three-phase charge algorithm: preconditioning (5–100 mA at VOUT < 3.0 V), constant-current regulation (programmable up to 1 A), and constant-voltage regulation (4.06 V or 4.2 V). Charge termination occurs when current falls below 5–100 mA threshold, backed by fixed 7-hour safety timer.

It features dual open-drain status outputs (STAT1/STAT2) encoding precharge, fast-charge, done, fault, and sleep states; PG output indicates valid input presence; CE enables/disables charging with timer reset on high-to-low transition; and VBSEL selects charge voltage with internal pull-down ensuring 4.2 V default if left floating.

Key Specifications

Pinout & Package

The BQ24083DRCT is housed in a thermally enhanced 3-mm × 3-mm VSON-10 (DRC) package with exposed thermal pad electrically connected to VSS. The pad must be soldered to a PCB ground plane using ≥6 vias for effective heat dissipation and EMI control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24083DRCT, BQ24075TARGER offers higher current and system power integration but lacks voltage selectability, while BQ24040DSQR reduces size and cost at the expense of precharge functionality and programmable voltage - making BQ24083DRCT optimal for balanced performance in space-limited, multi-chemistry portable devices.

Availability

BQ24083DRCT is available at Aetrix Electronics and suitable for smartphones, digital cameras, PDAs, and internet appliances requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for BQ24083DRCT 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 battery management IP.

The bq2408x family was engineered specifically for space-constrained, single-cell Li-ion charging in portable consumer electronics - emphasizing integration, thermal robustness, and autonomous operation without host microcontroller dependency.

FAQ

What is the function of the VBSEL pin on the BQ24083DRCT?

The VBSEL pin on the BQ24083DRCT selects the final battery regulation voltage: logic HIGH configures 4.06 V, and logic LOW configures 4.2 V. If left unconnected, an internal pull-down ensures default 4.2 V operation. This flexibility allows the BQ24083DRCT to support both standard and aged Li-ion cells without hardware changes.

How does the BQ24083DRCT handle deeply discharged batteries?

The BQ24083DRCT initiates a precharge phase when the OUT pin voltage falls below 2.8–3.2 V, delivering 5–100 mA to safely condition the battery before fast-charge begins. This behavior is defined by the V(LOWV) threshold and IO(PRECHG) current set by R_SET, ensuring the BQ24083DRCT can recover cells that would otherwise be rejected by fixed-threshold chargers.

What is the maximum continuous charge current supported by the BQ24083DRCT?

The BQ24083DRCT supports a maximum continuous charge current of 1000 mA, programmable via the external R_SET resistor connected between ISET and VSS. The actual current is calculated as I_OUT = V(SET) × K(SET) / R_SET, where V(SET) = 2.5 V (typical) and K(SET) = 322 (typical), enabling precise tuning of the BQ24083DRCT's output.

Does the BQ24083DRCT require external components for stable operation?

Yes - the BQ24083DRCT requires at minimum a 0.1 µF ceramic capacitor between IN and VSS, and another 0.1 µF ceramic capacitor between OUT and VSS for stability and noise suppression. An external R_SET resistor is mandatory to set charge current, and pull-up resistors are needed for open-drain STAT/PG outputs if interfacing with microcontrollers or LEDs.

How does the BQ24083DRCT indicate charge status to the system?

The BQ24083DRCT uses two open-drain status outputs - STAT1 and STAT2 - to encode five operational states: precharge (STAT1=ON, STAT2=ON), fast-charge (STAT1=ON, STAT2=OFF), charge done (STAT1=OFF, STAT2=ON), fault (both OFF), and sleep (both OFF). This allows direct LED drive or GPIO monitoring without additional logic, making the BQ24083DRCT ideal for simple, low-cost status feedback.