BQ24259RGER

Texas Instruments BQ24259RGER — 2-A Single‑Cell Li‑Ion/Li‑Pol Switching Battery Charger in 24‑VQFN (RGE)

The Texas Instruments BQ24259RGER is an I2C‑controlled, single‑cell Li‑Ion/Li‑Polymer switch‑mode (buck) battery charger designed for space‑constrained, USB/adaptor‑powered portable electronics. With up to 2 A of charge current and a compact 4 × 4 mm, 24‑pin VQFN (RGE) package featuring an exposed thermal pad, the BQ24259RGER helps engineers build reliable, high‑efficiency charging subsystems in smartphones, tablets, and portable embedded devices.

At‑a‑Glance Overview

• Brand / Manufacturer: Texas Instruments (TI)
• MPN: BQ24259RGER
• Series: bq24259
• Category: Battery Charger ICs
• Topology: Switching (Buck)
• Battery Chemistry: Li‑Ion, Li‑Polymer
• Number of Cells: 1 (single‑cell)
• Control Interface: I2C
• Maximum Charge Current: 2 A
• Package: 24‑VQFN (RGE), 4 × 4 mm, exposed pad
• Mounting Type: Surface Mount
• Packaging: Tape & Reel (TR)
• Lifecycle Status: Active
• RoHS/Environmental Status: RoHS Compliant

Why Choose the Texas Instruments BQ24259RGER?

Selecting the right battery charger IC is critical to the overall user experience and product reliability of portable devices. The Texas Instruments BQ24259RGER integrates a switch‑mode buck charging stage that supports up to 2 A charge current for single‑cell Li‑Ion/Li‑Polymer packs, helping you balance performance, thermal behavior, and board area.

• High charge current in a small footprint: Deliver up to 2 A in a 4 × 4 mm package to reduce charge times without sacrificing valuable PCB space.
• Digital configurability: I2C control provides software‑defined flexibility for charge management and system integration.
• Efficient power conversion: Buck topology is well‑suited for adaptor and USB‑powered designs, improving efficiency compared to linear chargers and easing thermal constraints.
• Rugged assembly: The exposed thermal pad enhances heat dissipation and improves mechanical integrity when properly soldered to the PCB.

These traits make the BQ24259RGER an excellent fit for consumer products and embedded systems where battery life, charging time, and form factor are paramount.

Detailed Specifications

• Battery Chemistry: Li‑Ion, Li‑Polymer
• Number of Cells: 1
• Topology: Switching (Buck)
• Control Interface: I2C
• Charge Current (Max): 2 A
• Package Code: RGE
• Package Size: 4 × 4 mm
• Pin Count: 24
• Exposed Pad: Yes
• Mounting: Surface Mount
• Packaging: Tape & Reel (TR)
• Series: bq24259
• Manufacturer: Texas Instruments

Not specified in datasheet (from provided data):

• Input voltage range
• Target regulation/charge voltage
• Precharge/termination currents
• Safety timers and protection thresholds
• Operating temperature range

For these and other design‑critical parameters, consult the TI datasheet and product page linked below.

Design and Integration Considerations

Integrating a switch‑mode charger into a modern portable device requires careful attention to layout, thermal design, and firmware control. While exact numeric guidelines are application‑dependent and found in the datasheet, the following best practices apply broadly:

• Layout for low noise and high efficiency:

• Place high‑frequency components (inductor, input/output capacitors) close to the device pins to minimize loop area.

• Use short, wide traces for power paths and a solid ground reference to reduce parasitic effects.

• Keep the I2C lines routed away from the switching node to reduce noise coupling.

• Thermal management:

• Fully solder the exposed pad to a ground copper island.

• Implement multiple thermal vias under the pad to spread heat into internal layers.

• Consider airflow and enclosure constraints when defining the maximum operating charge current.

• Power source planning:

• The device is described as suitable for USB/adaptor‑powered systems; ensure your upstream source and cable limits are considered in system current budgeting.

• Validate charge current profiles via I2C in firmware to respect source limits and thermal conditions.

• Firmware and system safety:

• Leverage the I2C interface to monitor charging states (as supported) and adapt charge current or enable/disable charging based on system conditions.

• Implement system‑level protections (fuses, input filtering, ESD/EMI measures) per your product’s compliance requirements.

• Manufacturing and test:

• Plan for in‑circuit test access to I2C and power rails for production screening.

• Use the Tape & Reel option (TR) to streamline SMT placement and automated assembly.

Applications

The Texas Instruments BQ24259RGER addresses a wide spectrum of portable designs that demand compact size and robust single‑cell charging management:

• Smartphones and mobile handsets
• Tablets and portable media players
• Handheld and portable consumer electronics
• Portable embedded/IoT devices

These devices benefit from the charger’s combination of 2 A current capability, switching efficiency, and I2C configurability, making it easier to tailor charging behavior to specific batteries, enclosures, and usage profiles.

Lifecycle, Availability, and Replacements

• Lifecycle Status: Active (per provided data)
• Replacements: Not specified in datasheet (no direct replacements listed in provided data)

For the most current lifecycle information, recommended replacements, and cross‑references, always check the Texas Instruments product page. Supply continuity planning should include review of manufacturer notices and longevity statements when available.

Compliance and Environmental

• RoHS Status: RoHS Compliant
• Other Environmental or Safety Certifications: Not specified in datasheet

If your project requires specific substance declarations, halogen‑free status, or compliance certificates (e.g., REACH), download TI’s environmental compliance reports via the product page and verify against your internal standards.

Packaging, Handling, and Assembly Notes

• Package: 24‑VQFN (RGE), 4 × 4 mm with exposed thermal pad
• Mounting: Surface Mount
• Packaging Type: Tape & Reel (TR)

Assembly considerations:

• Moisture sensitivity level (MSL): Not specified in datasheet (verify on the TI product page or datasheet label before reflow profile definition).
• Reflow profile: Follow TI’s package‑specific recommendations and your PCB assembly house guidelines.
• Soldering: Ensure full pad wetting on the exposed pad and correct stencil design to prevent voiding; use thermal vias to improve heat spreading.

Proper handling, ESD control, and IPC‑compliant assembly practices are essential to maintain yield and long‑term reliability.

Selection Tips and Design Checklist

When you shortlist the Texas Instruments BQ24259RGER for your design, confirm the following items to ensure a smooth path to production:

• Battery pack: Single‑cell Li‑Ion/Li‑Polymer with manufacturer‑recommended charge profiles.
• Charge current target: Up to 2 A supported; validate against thermal limits, enclosure constraints, and source current capability.
• System supply: USB or adaptor source characteristics (voltage/cable rating, current limits, surge behavior) aligned with your charging strategy.
• Digital control: I2C available in your system for configuration and monitoring.
• PCB real estate: 4 × 4 mm VQFN with adequate space for inductor, capacitors, and thermal copper.
• Compliance: RoHS needs satisfied; evaluate any additional environmental or safety requirements.
• Production flow: Tape & Reel procurement, MSL handling, and test strategy in place.

This checklist helps engineers, buyers, and sourcing managers reduce back‑and‑forth and converge on a validated bill of materials quickly.

Frequently Asked Questions (FAQs)

Q: What battery types does the Texas Instruments BQ24259RGER support?
A: Single‑cell Lithium‑Ion and Lithium‑Polymer packs.

Q: How many cells can it charge?
A: One cell (1S configuration).

Q: What is the maximum charge current?
A: Up to 2 A (maximum), as specified in the provided data.

Q: What control interface does it use?
A: I2C, enabling software‑configurable charging behavior.

Q: What is the package for the BQ24259RGER?
A: 24‑pin VQFN (RGE) measuring 4 × 4 mm with an exposed thermal pad.

Q: Is the Texas Instruments BQ24259RGER RoHS compliant?
A: Yes, it is listed as RoHS Compliant.

Q: Is the part active?
A: Yes, the lifecycle status is Active (per provided data). Always confirm on the TI product page.

Q: What are the input voltage range and charge voltage?
A: Not specified in datasheet (from the provided data). Refer to TI’s datasheet for exact limits.

Q: Is there a recommended or pin‑compatible replacement?
A: Not specified in datasheet (no replacements are listed in the provided data). Check the TI product page for cross‑references.

Resources

• Texas Instruments Product Page: https://www.ti.com/product/BQ24259
• Datasheet (Texas Instruments): https://www.ti.com/lit/ds/symlink/bq24259.pdf

These official resources provide the most accurate and up‑to‑date specifications, application guidance, and documentation for the Texas Instruments BQ24259RGER.

Quick Ordering and BOM Notes

• MPN: Texas Instruments BQ24259RGER
• Series: bq24259
• Category: Battery Charger ICs
• Package: 24‑VQFN (RGE), 4 × 4 mm, exposed pad
• Mounting: Surface Mount
• Packaging: Tape & Reel (TR)
• Compliance: RoHS Compliant

Call out the full MPN (BQ24259RGER) on your BOM, include the packaging suffix for Tape & Reel if required by your purchasing system, and verify lifecycle/compliance periodically before production builds. This ensures your sourcing team can procure the correct Texas Instruments BQ24259RGER variant without last‑minute clarifications.