Texas Instruments BQ24007PWP

Overview

BQ24007PWP from Texas Instruments is a highly integrated single-cell Li-ion linear battery charger IC with integrated P-channel FET pass transistor, reverse-blocking Schottky diode, thermal protection, and timer-enable functionality. It delivers up to 1.2-A continuous charge current, ±1% voltage regulation accuracy (4.1 V or 4.2 V selectable), and supports preconditioning of deeply discharged cells. It is used in space-constrained portable electronics such as PDAs and digital cameras.

For engineers reviewing the BQ24007PWP datasheet, BQ24007PWP pinout, BQ24007PWP application, or BQ24007PWP equivalent, key selection criteria include its 20-pin thermally enhanced TSSOP (PWP) package, dual-LED status output configuration, programmable charge termination via TMR EN/TMR SEL, and compatibility with coke or graphite anode Li-ion cells.

Technical Context

The BQ24007PWP implements a three-phase charging algorithm-preconditioning (60 mA typical), constant-current (programmable up to 1.2 A via external sense resistor), and constant-voltage (4.1 V/4.2 V selectable)-with automatic recharge when battery voltage falls below 3.9 V. Its internal thermal shutdown activates at 165°C with 10°C hysteresis.

Charge qualification relies on dual inputs: APG/THERM monitors either adapter power good status or NTC/PTC thermistor voltage for temperature-based safety, while LOWV comparator prevents fast-charging below 2.9 V. The TMR EN input enables host-level control over safety timers-low enables full timer operation (precharge + fast-charge + taper), high disables fast-charge/taper timers but retains preconditioning timing.

Key Specifications

Pinout & Package

The BQ24007PWP uses a 20-lead thermally enhanced TSSOP PowerPAD™ package (PWP), featuring an exposed thermal pad on the underside for direct PCB heat sinking. Package dimensions are 6.5 mm × 4.4 mm × 1.2 mm, with 0.65 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24007PWP, BQ24008PWP adds a second status output for enhanced UI but increases LED drive complexity, while BQ24075RGTR offers identical electrical performance in a smaller, thermally superior QFN package-making it suitable for next-generation miniaturized designs where layout density is critical.

Availability

BQ24007PWP is available at Aetrix Electronics and suitable for portable digital assistants, internet appliances, MP3 players, and digital cameras requiring stable component supply and long-term production continuity.

Supply support for BQ24007PWP 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 over 50 years of innovation in energy-efficient electronics.

The BQ24007PWP belongs to TI's bq2400x family of highly integrated Li-ion linear chargers, designed specifically for space-limited portable devices needing precision voltage/current regulation, thermal safety, and host-controllable charge timing.

FAQ

What is the maximum continuous charge current supported by the BQ24007PWP?

The BQ24007PWP supports up to 1.2-A continuous charge current. This value is programmable using an external current-sense resistor (R_SNS) ranging from 0.083 Ω to 1 Ω. At 1.2 A, the dropout voltage is 0.8 V, ensuring efficient operation with input voltages as low as 4.5 V. The BQ24007PWP datasheet specifies this rating under recommended operating conditions (−40°C to 125°C junction temperature).

How does the BQ24007PWP handle deeply discharged batteries?

The BQ24007PWP initiates a preconditioning phase when the battery voltage falls below 2.9 V, applying a controlled 40–80 mA precharge current to safely restore cell voltage before entering constant-current mode. A dedicated 22.5-minute preconditioning timer limits duration for safety. This function is implemented via the LOWV comparator and internal bias generator, and is independent of the TMR EN pin state.

What is the purpose of the TMR EN pin on the BQ24007PWP?

The TMR EN pin on the BQ24007PWP is an active-low input that enables or disables the main charge safety timers. When pulled low, it activates both the fast-charge and taper timers; when held high, it disables them-allowing continuous charging without time-based termination. The preconditioning timer remains active regardless of TMR EN state. This feature is essential for applications where charge current is shared with a system load.

Can the BQ24007PWP be used with both coke and graphite anode Li-ion cells?

Yes, the BQ24007PWP supports both coke and graphite anode chemistries via the VSEL pin. When VSEL is low, the device regulates at 4.1 V (optimized for coke anodes); when high, it regulates at 4.2 V (for graphite anodes). The voltage regulation accuracy is ±1% across temperature and load, ensuring safe and reliable charging for either chemistry without external compensation.

What thermal management considerations apply to the BQ24007PWP in the PWP package?

The BQ24007PWP in the PWP package requires connection of the GND/HEATSINK pin (pin 10) to a large PCB copper pour for effective thermal dissipation. With proper layout-including thermal vias and ≥8 cm² copper area-the device achieves 3.238 W power dissipation at 25°C ambient. Its thermal shutdown triggers at 165°C junction temperature, with 10°C hysteresis, and resumes charging only after cooling to 155°C.