Texas Instruments BQ21061YFPT

Overview

BQ21061YFPT from Texas Instruments is an I²C-controlled 1-cell linear battery charger IC with integrated power path management, regulated PMID output (4.4–4.9 V), and configurable LDO/load switch (0.6–3.7 V). It delivers up to 500-mA fast charge current with ±0.5% battery voltage regulation accuracy (3.6–4.6 V), supports 10-nA ship mode quiescent current, and operates across –40°C to +85°C for ultra-low-power wearable medical and portable devices.

For engineers reviewing the BQ21061YFPT datasheet, BQ21061YFPT pinout, BQ21061YFPT application, or BQ21061YFPT equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, real-world use cases in hearing aids and blood glucose monitors, and two rigorously cross-checked alternative parts with documented functional differences.

Technical Context

The BQ21061YFPT implements a dual-path power architecture: a linear charging path with programmable DPPM (Dynamic Power Path Management) and a regulated system rail (PMID) that dynamically switches between VIN pass-through, battery tracking, and fixed-voltage regulation. Its JEITA-compliant thermal charging profile uses four independent NTC thresholds (hot/warm/cool/cold) with 4.7-mV hysteresis, all configurable via I²C registers.

It integrates three independent power domains: a 500-mA linear charger with 1.25-mA–500-mA I²C-programmable current range and 1% termination accuracy; a 150-mA LDO or load switch with 2% output voltage accuracy and 250–450-mΩ R_DS(on); and a 1.8-V VDD LDO with 2.2-µF output capacitance requirement. All control logic, fault reporting (INT, PG), and push-button wake/reset (/MR) are synchronized to the I²C interface operating at 100–400 kHz.

Key Specifications

Pinout & Package

Package: 20-pin DSBGA (YFP), 2.00 mm × 1.60 mm, 0.4-mm pitch, 11-mm² total solution size.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery charge management applications.

Compared with BQ21061YFPT, BQ21040YFPT lacks PMID voltage regulation and LDO capability-limiting its use in multi-rail systems-while BQ25150YFPT replaces the linear charger with a buck converter, increasing efficiency but removing fine-grained thermal control and adding switching noise sensitivity.

Availability

BQ21061YFPT is available at Aetrix Electronics and suitable for headsets, blood glucose monitors, and smart watches requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing for FDA-regulated medical designs.

Supply support for BQ21061YFPT 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 and embedded processing technologies, with over 50 years of innovation in power management and battery solutions.

The BQ21061YFPT belongs to TI's BQ210xx family of highly integrated battery chargers designed specifically for space-constrained, ultra-low-power wearable and portable medical devices requiring precision charging, regulated system rails, and extended shelf life.

FAQ

What is the maximum input voltage tolerance for the BQ21061YFPT?

The BQ21061YFPT has an absolute maximum input voltage rating of 20 V on the IN pin, ensuring robustness against transient surges in USB or wall-adapter applications. Its recommended operating input voltage range is 3.15 V to 5.25 V, with overvoltage protection triggering at 5.35–5.8 V (rising edge) and 5.4 V (falling edge) to safeguard internal circuitry.

How does the BQ21061YFPT achieve 10-nA ship mode current?

The BQ21061YFPT achieves 10-nA ship mode by disabling all internal regulators except a minimal bias circuit, disconnecting the battery FET, and placing I/O pins in high-impedance state. This occurs automatically when VIN = 0 V and /MR is held low for ≥125 ms (tWAKE1 timer), verified per datasheet Section 6.5 (IBAT_SHIP = 10 nA).

Can the BQ21061YFPT regulate the PMID output to exactly 4.6 V?

Yes-the BQ21061YFPT supports I²C-programmable PMID regulation from 4.4 V to 4.9 V in 100-mV steps, so 4.6 V is a valid and supported setting. The default is 4.5 V, and accuracy is ±1% at 100 mA load and ±3% across 0–500 mA, per datasheet Section 6.5 (VPMID_REG_ACC).

Does the BQ21061YFPT support JEITA-compliant charging profiles?

Yes-the BQ21061YFPT implements full JEITA compliance via four independently programmable NTC thresholds (VHOT, VWARM, VCOOL, VCOLD) with 4.7-mV hysteresis, allowing dynamic reduction of charge current across hot, warm, cool, and cold temperature zones as defined in JEITA EC-62368.

What is the purpose of the /LP pin on the BQ21061YFPT?

The /LP (Low Power Mode Enable) pin on the BQ21061YFPT forces the device into low-power mode when driven low while powered solely by battery (VIN = 0 V), reducing quiescent current to 0.46–0.9 µA. It must be driven high to re-enable I²C communication when VIN is absent, and has no effect when VIN is present.