Texas Instruments BQ24003RGWR

Overview

BQ24003RGWR from Texas Instruments is a single-cell Li-ion linear charge management IC with integrated P-channel FET, reverse-blocking Schottky diode, thermal shutdown, and programmable 4.1 V / 4.2 V regulation. It delivers up to 1.2 A continuous charge current, ±1% voltage accuracy, and supports preconditioning, constant-current/constant-voltage charging for portable devices with coke or graphite anodes.

For engineers reviewing the BQ24003RGWR datasheet, BQ24003RGWR pinout, BQ24003RGWR application, or BQ24003RGWR equivalent, key selection considerations include its single bicolor LED status output configuration, 20-pin 5 mm × 5 mm MLP (RGW) package with exposed thermal pad, TMR SEL–programmable 3/4.5/6-hour charge timer, and APG/THERM dual-mode (adapter power or thermistor) qualification input.

Technical Context

The BQ24003RGWR implements a three-phase Li-ion charge algorithm: low-current preconditioning for deeply discharged cells (<3.0 V), followed by constant-current regulation (set via external sense resistor RSNS = 0.083–1 Ω), then constant-voltage regulation at either 4.1 V (VSEL = GND) or 4.2 V (VSEL = VCC). Charge termination occurs via minimum taper current detection (12–25 mV across RSNS) or user-selectable timer expiration.

It integrates safety functions including thermal shutdown at 165°C (10°C hysteresis), overvoltage protection (4.35–4.55 V), low-voltage lockout (4.35–4.50 V), and battery temperature or input-power qualification via the APG/THERM pin. The device operates from 4.5 V to 10 V input and maintains ±1% regulation accuracy across –40°C to 125°C junction temperature.

Key Specifications

Pinout & Package

Package: 20-pin 5 mm × 5 mm MLP (RGW) with exposed thermal die pad - optimized for high-power dissipation (3.183 W at TA = 25°C) and requires PCB thermal via connection to internal ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24002RGWR and BQ24001RGWR, the BQ24003RGWR uniquely provides coordinated bicolor LED status using two open-drain outputs - enabling intuitive red/yellow/green state coding without external logic, while retaining identical charge performance and thermal protection.

Availability

BQ24003RGWR is available at Aetrix Electronics and suitable for portable digital assistants, internet appliances, and MP3 players requiring stable component supply, consistent thermal performance, and long-lifecycle availability for consumer electronics production.

Supply support for BQ24003RGWR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The BQ24003RGWR belongs to TI's bq2400x family of highly integrated Li-ion linear chargers - designed specifically for space-constrained, single-cell portable devices requiring precision voltage/current regulation, comprehensive safety monitoring, and flexible status indication.

FAQ

What is the function of the APG/THERM pin on the BQ24003RGWR?

The APG/THERM pin on the BQ24003RGWR serves a dual role: it can monitor adapter power presence (as an "adapter power good" signal) or sense battery temperature via an external NTC/PTC thermistor. When configured for temperature sensing, the BQ24003RGWR suspends charging if the voltage at this pin falls outside user-defined thresholds (0.545–0.570 V lower trip, 1.480–1.515 V upper trip), ensuring safe operation across environmental conditions. This functionality is integral to the BQ24003RGWR's safety architecture and must be properly configured per application requirements.

How does the BQ24003RGWR handle deeply discharged batteries?

The BQ24003RGWR handles deeply discharged batteries through its integrated preconditioning phase: when the VSENSE voltage is below 2.80–3.00 V (LOWV comparator threshold), it activates a dedicated 40–80 mA precharge current source to safely raise the cell voltage before entering constant-current mode. A 22.5-minute timer limits this phase to prevent indefinite low-current charging. This feature is built into the BQ24003RGWR's analog control loop and requires no external circuitry - protecting graphite or coke anode cells from lithium plating damage during recovery.

What are the voltage regulation options for the BQ24003RGWR, and how are they selected?

The BQ24003RGWR offers two precision charge voltage options: 4.1 V for Li-ion cells with coke anodes and 4.2 V for those with graphite anodes. Selection is made via the VSEL pin: connecting VSEL to GND configures 4.1 V regulation, while tying it to VCC selects 4.2 V. The BQ24003RGWR achieves ±1% accuracy over –40°C to 125°C junction temperature and full input voltage range. Leaving VSEL floating is prohibited - it must be actively driven to ensure predictable BQ24003RGWR behavior and regulation stability.

What thermal management provisions does the BQ24003RGWR include?

The BQ24003RGWR includes on-die thermal shutdown that disables the internal P-channel FET when junction temperature exceeds 165°C, with 10°C hysteresis (resumes at 155°C). Its 5 mm × 5 mm MLP (RGW) package features an exposed thermal die pad requiring solder connection to a PCB copper plane with thermal vias. At TA = 25°C, the BQ24003RGWR supports 3.183 W dissipation; derating is 0.0318 W/°C above ambient. These provisions ensure reliable BQ24003RGWR operation under sustained 1.2 A charge loads in compact enclosures.

How does the BQ24003RGWR terminate charging?

The BQ24003RGWR terminates charging using two independent methods: (1) minimum taper current detection - when charge current drops below 12–25 mV across the sense resistor (RSNS), a 22-minute timer starts and fast charge ends upon expiration; and (2) maximum time limit - set via TMR SEL pin to 3, 4.5, or 6 hours. Both methods operate concurrently; whichever occurs first stops charging. The BQ24003RGWR also supports automatic recharge when battery voltage falls below 3.80–4.00 V (HIGHV threshold), ensuring full utilization of the BQ24003RGWR's charge management capabilities.