Texas Instruments BQ24161YFFR

Overview

BQ24161YFFR from Texas Instruments is a 2.5-A dual-input switched-mode Li-ion battery charger with integrated power path management and I²C interface, designed for portable systems requiring simultaneous system power and battery charging. It supports USB (up to 1.5 A) and IN (up to 2.5 A at 10.5 V) inputs, delivers 1% battery voltage regulation accuracy, and enables instant system startup from a deeply discharged or absent battery.

For engineers reviewing the BQ24161YFFR datasheet, BQ24161YFFR pinout, BQ24161YFFR application, or BQ24161YFFR equivalent, this device is selected for space-constrained, high-capacity battery applications where input source selection, JEITA-compliant NTC monitoring, and programmable charge parameters via I²C are critical design requirements.

Technical Context

The BQ24161YFFR implements a synchronous buck converter topology with dual independent input paths (USB and IN), each featuring dedicated overvoltage protection (6.5 V for USB, 10.5 V for IN) and programmable current limits via I²C. Its power path architecture separates system power (SYS) from battery charging (BAT), allowing the system to operate directly from input while charging the battery concurrently.

It integrates internal MOSFETs-including top-side reverse-blocking FETs (95 mΩ USB path, 45 mΩ IN path), switching FETs (100–110 mΩ), and bottom-side sync FET (65–115 mΩ)-and supports JEITA-compliant thermal regulation using the TS pin with four threshold levels (VHOT, VWARM, VCOOL, VCOLD) referenced to DRV voltage.

Key Specifications

Pinout & Package

Package: 49-ball DSBGA (YFF), 2.8 mm × 2.8 mm, 0.4 mm pitch, thermal pad connected to PGND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24161YFFR, BQ24163YFFT trades JEITA thermal precision for wider battery short-circuit tolerance, while BQ24161BRGRT offers identical functionality in a rework-friendly QFN-but with 37% higher junction-to-ambient thermal resistance, demanding more aggressive PCB thermal design.

Availability

BQ24161YFFR is available at Aetrix Electronics and suitable for smartphone power management, wireless audio charging, portable medical monitors, and rugged handheld scanners requiring stable component supply across high-volume production cycles.

Supply support for BQ24161YFFR 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 ICs, with decades of expertise in battery charging and power path architectures.

The BQ24161YFFR belongs to TI's BQ2416xx family of highly integrated Li-ion chargers, engineered specifically for space-constrained portable electronics that demand dual-input flexibility, JEITA thermal safety, and seamless system-battery power arbitration.

FAQ

What input voltage ranges does the BQ24161YFFR support?

The BQ24161YFFR supports two independent input rails: USB input from 4.2 V to 6.0 V (with 6.5 V overvoltage protection), and IN input from 4.2 V to 10.5 V (with 10.5 V overvoltage protection). Both inputs are fully isolated and selectable via I²C or hardware (PSEL for USB). This dual-input capability allows the BQ24161YFFR to serve as a universal charger across USB ports, AC adapters, and wireless power receivers without external switching components.

How does the BQ24161YFFR enable instant system startup with a dead battery?

The BQ24161YFFR implements true power path management: its internal buck converter regulates the SYS output voltage (typically 3.7 V) directly from the input source (USB or IN), independent of battery voltage. Even when the battery is at 0 V or removed, the BQ24161YFFR delivers stable system power-allowing microcontrollers and displays to boot immediately. Only after system stabilization does it begin trickle-charging the battery, ensuring zero downtime in consumer and medical portable devices using the BQ24161YFFR.

Does the BQ24161YFFR support JEITA-compliant battery charging?

Yes, the BQ24161YFFR supports JEITA-compliant charging through its TS pin, which monitors an NTC thermistor via a resistor divider referenced to the DRV rail. It implements four precise thresholds-VHOT (30% DRV), VWARM (38.3% DRV), VCOOL (56.5% DRV), and VCOLD (60% DRV)-each with hysteresis, enabling full JEITA profile enforcement (e.g., reduce charge current above 45°C or below 0°C). This capability is confirmed in the device comparison table and electrical characteristics section of the BQ24161YFFR datasheet.

What is the function of the PSEL pin on the BQ24161YFFR?

The PSEL pin on the BQ24161YFFR is a digital input that selects the USB input current limit at startup: logic high configures 100 mA mode (USB100), and logic low configures 1.5 A mode (USB150). Unlike the BQ24160's D+/D− detection, PSEL eliminates analog sensing circuitry and provides deterministic, noise-immune source identification. It has no effect on the IN input and must be actively driven-floating is prohibited. This feature simplifies design and improves reliability in USB-C and proprietary adapter applications using the BQ24161YFFR.

What package type and size is the BQ24161YFFR supplied in?

The BQ24161YFFR is supplied in a 49-ball DSBGA (Die Size Ball Grid Array) package, designated YFF, with nominal dimensions of 2.8 mm × 2.8 mm and 0.4 mm ball pitch. The thermal pad underneath is electrically connected to PGND and must be soldered to a dedicated PCB ground plane for thermal and electrical integrity. This ultra-compact package enables use in thin-profile portable devices where board space is constrained-such as TWS earbuds, smartwatches, and compact medical sensors-making the BQ24161YFFR ideal for next-generation wearables.