Texas Instruments BQ24266RGET

Overview

BQ24266RGET from Texas Instruments is a standalone 3-A, 30-V switchmode Li-ion battery charger IC with integrated power path management, supporting USB and wall adapter inputs. It delivers 93% peak efficiency, ±5% fast-charge current accuracy (500 mA–3 A), and JEITA-compliant thermistor monitoring via TS pin for safe charging across temperature ranges. It enables USB OTG boost (5 V/1 A) and thermal regulation at 125°C in handheld scanners and portable media players.

For engineers reviewing the BQ24266RGET datasheet, BQ24266RGET pinout, BQ24266RGET application, or BQ24266RGET equivalent, key selection criteria include input voltage-based DPM threshold programmability (4.2–11.6 V), integrated 3-A FETs with 47 mΩ BAT-SYS R_ON, BGATE-controlled external discharge FET support, and QFN-24 (4 mm × 4 mm) package compatibility with thermal pad grounding requirements.

Technical Context

The BQ24266RGET implements a synchronous buck topology with internal high-side and low-side MOSFETs (R_DS(ON) ≤135 mΩ each) and fixed 1.5 MHz switching frequency. Its power path architecture decouples system supply (SYS) from battery charging, enabling simultaneous charge and system operation while dynamically limiting input current to prevent adapter collapse via VIN_DPM feedback on VDPM pin.

It integrates four-threshold NTC monitoring (HOT/WARM/COOL/COLD) referenced to VDRV, supports host-controlled charge enable via CE, and provides open-drain status outputs (CHG, PG). Thermal regulation begins at 125°C junction temperature, and safety features include battery OVP (105% of V_BATREG), input OVP (14 V), and cycle-by-cycle current limiting (4.5 A).

Key Specifications

Pinout & Package

Package: VQFN-24 (RGE), 4.00 mm × 4.00 mm, exposed thermal pad electrically connected to PGND. Requires soldering thermal pad to PCB ground plane for thermal performance (R_θJB = 3.3°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24261RGET, BQ24266RGET adds OTG boost and BGATE for enhanced system flexibility; versus BQ24296RGER, it trades I²C configurability for pin-strapped simplicity and lower BOM cost-ideal for fixed-function, high-volume portable devices.

Availability

BQ24266RGET is available at Aetrix Electronics and suitable for handheld scanners, power banks, and portable media players requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for BQ24266RGET 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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for portable and industrial applications.

The BQ24266RGET belongs to TI's bq242xx standalone Li-ion charger family, designed specifically for space-constrained, high-efficiency battery-powered devices needing robust power path management and USB-compliant charging without microcontroller dependency.

FAQ

What is the maximum input voltage the BQ24266RGET can safely handle?

The BQ24266RGET has an absolute maximum input voltage rating of 30 V on the IN pin, with recommended operation up to 14 V. Its integrated overvoltage protection triggers at 14 V (typical), clamping further rise and protecting internal circuitry. This allows direct use with 12-V USB PD adapters and legacy wall adapters without external TVS diodes.

How does the BQ24266RGET manage power when both input supply and battery are present?

The BQ24266RGET uses true power path management: it powers the SYS rail directly from the IN supply via its internal buck converter while simultaneously charging the battery through a dedicated path. If the input cannot meet total system demand, the battery supplements current via the BAT-to-SYS FET, preventing SYS rail collapse without interrupting operation.

Can the BQ24266RGET charge a deeply discharged battery and start the system immediately?

Yes, the BQ24266RGET supports instant startup from a deeply discharged battery or no battery condition. When VIN exceeds VUVLO (3.3 V), it powers SYS directly and initiates precharge at 100 mA if VBAT < 2.9 V. This enables immediate system boot-even with 0-V battery-while safely recovering the cell.

What external components are mandatory for basic BQ24266RGET operation?

Mandatory components include: a 1.5–2.2 µH power inductor between SW and PGND; ≥4.7 µF ceramic capacitor from IN to PGND; ≥10 µF ceramic from SYS to PGND; ≥1 µF ceramic from BAT to PGND; 0.033 µF BOOT-to-SW capacitor; and a resistor from ISET to GND to set charge current. The thermal pad must be soldered to PCB ground.

Does the BQ24266RGET support JEITA-compliant charging without external microcontroller intervention?

Yes, the BQ24266RGET implements full JEITA compliance autonomously using its TS pin. With a simple resistor divider and NTC thermistor, it detects HOT/WARM/COOL/COLD zones and adjusts charge voltage (e.g., 4.06 V in WARM) and disables charging in HOT/COLD-no I²C or host processor required.