Texas Instruments BQ24005PWPRG4

Overview

BQ24005PWPRG4 from Texas Instruments is a two-cell Li-ion linear charge management IC with integrated P-channel FET pass transistor, reverse-blocking Schottky diode, and thermal protection. It delivers up to 1.2-A continuous charge current, ±1% voltage regulation accuracy, and dual-LED status indication (STAT1/STAT2), targeting space-constrained portable devices such as PDAs and internet appliances.

For engineers reviewing the BQ24005PWPRG4 datasheet, BQ24005PWPRG4 pinout, BQ24005PWPRG4 application, or BQ24005PWPRG4 equivalent, key selection criteria include its 20-pin HTSSOP PowerPAD™ package, programmable 8.2 V / 8.4 V charge voltage via VSEL, safety timer with 3/4.5/6-hour options, and thermistor-based temperature qualification before and during charge.

Technical Context

The BQ24005PWPRG4 implements a three-phase charging algorithm-preconditioning (40–80 mA), constant-current (programmable up to 1.2 A), and constant-voltage (8.2 V or 8.4 V)-with termination by minimum taper current (12–25 mV across sense resistor) and/or user-selectable timer. Its APG/THERM input supports dual-mode operation: adapter power-good detection or NTC/PTC thermistor-based battery temperature monitoring with upper/lower thresholds of 1.498 V / 0.558 V.

Charge control logic integrates thermal shutdown at 165°C (10°C hysteresis), UVLO on VCC (8.9 V start, 8.66 V stop), and overvoltage protection (9.00 V trip). The device uses external R_SNS for current setting (0.083–1 Ω range) and includes dedicated CR bypass capacitor pin for internal regulator stability.

Key Specifications

Pinout & Package

Package: 20-pin HTSSOP PowerPAD™ (PWP) with exposed thermal pad; requires PCB copper pour and thermal vias for 3.238 W dissipation at T_A ≤ 25°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24004PWP and BQ24006PWP, the BQ24005PWPRG4 uniquely supports independent red/green LED control for granular status visibility-enabling simultaneous precharge (red), fast charge (red), and done (green) states without color mixing ambiguity.

Availability

BQ24005PWPRG4 is available at Aetrix Electronics and suitable for handheld internet appliances, portable media players, digital still cameras, and enterprise PDAs requiring stable component supply and long-lifecycle support.

Supply support for BQ24005PWPRG4 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 bq2400x product line was engineered specifically for highly integrated, space-limited Li-ion charging in portable consumer electronics-emphasizing autonomous operation, thermal safety, and minimal external component count.

FAQ

What is the maximum input voltage rating for the BQ24005PWPRG4?

The BQ24005PWPRG4 has an absolute maximum input voltage rating of 13.5 V on all pins including IN, ISNS, EN, APG/THERM, STAT1, STAT2, VSENSE, TMR SEL, VSEL, and VCC. However, the recommended operating input voltage range is 8.4 V to 10 V. Exceeding 10 V may degrade long-term reliability or trigger overvoltage protection at 9.00 V, which halts charging to protect the battery.

How does the BQ24005PWPRG4 handle deeply discharged batteries?

The BQ24005PWPRG4 initiates a preconditioning phase when the battery voltage sensed at VSENSE falls below 5.75 V. During this phase, it delivers a regulated 40–80 mA precharge current to safely recover cells without excessive heat generation. A dedicated 22.5-minute timer limits this stage, after which the device transitions to constant-current charging if the battery voltage rises above the low-voltage threshold.

Can the BQ24005PWPRG4 be used with both coke and graphite anode Li-ion cells?

Yes, the BQ24005PWPRG4 supports both chemistries via the VSEL pin: logic low selects 8.2 V per two-cell pack (coke anode), and logic high selects 8.4 V (graphite anode). This ±1% accurate regulation ensures optimal charging profiles for either cell type without external component changes, and the datasheet confirms compatibility across the full operating temperature range.

What thermal management provisions does the BQ24005PWPRG4 include?

The BQ24005PWPRG4 integrates junction temperature sensing with automatic thermal shutdown at 165°C and 10°C hysteresis. Its HTSSOP PowerPAD™ package requires soldering the exposed thermal pad to a PCB copper plane with thermal vias. With proper layout, it sustains 3.238 W at 25°C ambient; derating is 0.0324 W/°C above that point, ensuring safe operation under sustained 1.2-A charge loads.

How is charge termination implemented in the BQ24005PWPRG4?

The BQ24005PWPRG4 terminates charging using dual criteria: (1) taper current detection-when charge current drops below 12–25 mV across the sense resistor, a 22.5-minute timer starts, and (2) maximum time limit-user-selectable via TMR SEL pin (3/4.5/6 hours). Charging stops if either condition is met, and automatically resumes if battery voltage later falls below 7.85 V (recharge threshold).