Texas Instruments BQ25120YFPR

Overview

BQ25120YFPR from Texas Instruments is a highly integrated battery charge management IC for wearables and IoT, combining a 300-mA buck regulator (1.8-V default), 100-mA configurable load switch/LDO, linear charger with 0.5% voltage regulation (3.6–4.65 V), 500 µA–37 mA programmable termination current, and I²C-controlled power path management. It enables ultra-low-quiescent operation (<50 nA in Ship Mode) and JEITA-compliant NTC monitoring for smart watches and health monitors.

For engineers reviewing the BQ25120YFPR datasheet, BQ25120YFPR pinout, BQ25120YFPR application, or BQ25120YFPR equivalent, key selection considerations include its 2.5 mm × 2.5 mm DSBGA-25 package, 700 nA typical operating IQ with buck enabled, 3.4–5.5 V input range, 300-mA max charge current, and integrated push-button wake/reset with programmable timers.

Technical Context

The BQ25120YFPR implements a dual-path power architecture: input-to-system (PMID) and battery-to-system (SYS), with automatic priority-based power path management. Its DCS-Control™ buck converter maintains high efficiency down to 10 µA load, while the linear charger supports precharge, constant-current, and constant-voltage phases with JEITA-compliant TS input for four-point temperature threshold detection (VHOT/VWARM/VCOOL/VCOLD).

I²C interface (100–400 kHz) provides full programmability of charge voltage (10-mV steps), charge current (5–300 mA), input current limit (50–400 mA), termination current (0.5–37 mA), SYS output (1.1–3.3 V), and LDO/LS output (0.8–3.3 V). Fault reporting includes open-drain INT and PG outputs with deglitched pulse interrupts for thermal shutdown, OVP, and battery short.

Key Specifications

Pinout & Package

Package: 2.5 mm × 2.5 mm, 25-pin DSBGA (YFP).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ25122YFPR and BQ25123YFPR, the BQ25120YFPR uniquely balances configurability (load switch/LDO selection), ultra-low IQ, and JEITA compliance - making it the most versatile choice for space-constrained, battery-life-critical wearables without boost or VBUS-sensing requirements.

Availability

BQ25120YFPR is available at Aetrix Electronics and suitable for smart wearables, fitness trackers, medical sensors, and rechargeable toys requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for BQ25120YFPR 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 delivering analog and embedded processing solutions, with over 50 years of innovation in power management ICs and battery systems.

The BQ25120YFPR belongs to TI's bq251xx family of highly integrated charge management ICs, designed specifically for ultra-low-power wearable and IoT endpoints where minimal footprint, sub-µA quiescent current, and JEITA-compliant safety are mandatory.

FAQ

What is the maximum input voltage tolerance for the BQ25120YFPR?

The BQ25120YFPR supports an absolute maximum input voltage of 20 V on the IN pin, with a recommended operating range of 3.4 V to 5.5 V. Its 5.5-V overvoltage protection (OVP) threshold has ±0.2 V accuracy and 100 mV hysteresis, allowing robust operation during USB transients without external clamping circuitry. This 20-V tolerance ensures reliability in noisy or unregulated adapter environments.

How does the BQ25120YFPR achieve <50 nA Ship Mode current?

The BQ25120YFPR achieves <50 nA Ship Mode current by disabling all internal regulators, disconnecting the battery from PMID and SYS paths, and placing all I/O pins in high-impedance state except CD and MR. In this mode, only the 20-kΩ internal PMID discharge resistor and leakage through the MR input remain active - resulting in a typical 2 nA to 150 nA total battery drain, verified across –40°C to 85°C.

Can the BQ25120YFPR support both load switch and LDO configurations?

Yes - the BQ25120YFPR supports both configurations on the LS/LDO pin. By default, it operates as a load switch; configuring bit SW_LDO = 0 in the I²C register map switches it to LDO mode with programmable output from 0.8 V to 3.3 V in 0.1-V steps. Hardware selection is also possible using the LSCTRL pin, enabling flexible system-level power architecture decisions without board revision.

What JEITA temperature thresholds does the BQ25120YFPR implement on the TS pin?

The BQ25120YFPR implements four fixed JEITA-compliant thresholds on the TS pin: VHOT = 15% VIN (≈14.5–15.2% typ), VWARM = 20.5% VIN (≈20.1–20.8%), VCOOL = 36% VIN (≈35.4–36.4%), and VCOLD = 39.8% VIN (≈39.3–40.2%). These thresholds trigger automatic charge suspension or reduction when battery temperature exceeds safe limits - verified per JEITA EC-62133 Annex A.

Is the BQ25120YFPR pin-compatible with other devices in the bq251xx family?

Yes - the BQ25120YFPR shares identical pinout, package (DSBGA-25 YFP), and register map with BQ25122YFPR and BQ25123YFPR. This allows drop-in replacement for functional upgrades (e.g., adding boost with BQ25122) or feature reductions (e.g., fixed LDO with BQ25123), provided firmware and external components (inductor, resistors) align with the selected variant's capabilities.