Texas Instruments BQ27530YZFR-G1

Overview

BQ27530YZFR-G1 from Texas Instruments is a system-side battery management unit (BMU) for single-cell Li-Ion battery packs, integrating Impedance Track™ fuel gauging and charger control. It delivers 1% SOC accuracy, supports 5–20 mΩ sense resistors, operates with 400-kHz I²C interface, and resides on the host main board to manage embedded or removable batteries alongside bq2416x chargers in smartphones and tablets.

For engineers reviewing the BQ27530YZFR-G1 datasheet, BQ27530YZFR-G1 pinout, BQ27530YZFR-G1 application, or BQ27530YZFR-G1 equivalent, key selection criteria include coulomb counter offset (<10 µV), sleep current (23 µA), 14-bit ADC resolution for voltage/temperature/current sensing, and DSBGA-15 package compatibility with space-constrained mobile PCB layouts.

Technical Context

The BQ27530YZFR-G1 implements TI's patented Impedance Track™ algorithm to model battery discharge curves and dynamically adjust for aging, self-discharge, and temperature-rate inefficiencies. It integrates a 14-bit integrating ADC for coulomb counting (±0.007% INL), dual oscillators (8.389 MHz HFO / 32.768 kHz LFO), and a 2.5-V LDO regulator (2.3–2.6 V output).

It autonomously controls bq2416x switch-mode chargers via BSCL/BSDA signals while supporting host-initiated charge profile customization-including temperature-level charging (TLC) and multi-level charging (MLC)-and provides real-time parameters including RemainingCapacity(), FullChargeCapacity(), and StateOfCharge() via I²C.

Key Specifications

Pinout & Package

Package: 15-pin DSBGA (NanoFree™), body size 2.61 mm × 1.96 mm, 0.5 mm pitch, bottom-side solder ball layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery fuel gauging applications.

Compared with BQ27530YZFR-G1, BQ27510G3YZFR saves board space but removes bq2416x coordination capability, while BQ27426YZFT reduces power consumption and BOM cost at the expense of MaxLife™ technology and multi-level charging intelligence.

Availability

BQ27530YZFR-G1 is available at Aetrix Electronics and suitable for smartphones, tablets, and handheld terminals requiring stable component supply, long-term data flash retention, and autonomous battery management with minimal host firmware overhead.

Supply support for BQ27530YZFR-G1 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, embedded processing, and power management technologies, with leadership in battery management ICs since 2005.

The BQ27530YZFR-G1 belongs to TI's Impedance Track™ fuel gauge product line, designed specifically for space-constrained, high-accuracy single-cell Li-ion systems requiring autonomous charger coordination and lifetime battery health tracking.

FAQ

What is the primary function of the BQ27530YZFR-G1 in a battery management system?

The BQ27530YZFR-G1 serves as a system-side battery management unit that combines high-accuracy fuel gauging using TI's Impedance Track™ algorithm with autonomous control of bq2416x switch-mode chargers. It reports real-time parameters-including RemainingCapacity(), StateOfCharge(), and FullChargeCapacity()-via I²C while managing charge profiles based on temperature, SOH, and load conditions without host processor intervention. The BQ27530YZFR-G1 is optimized for embedded and removable single-cell Li-ion applications in mobile consumer electronics.

How does the BQ27530YZFR-G1 achieve <1% state-of-charge accuracy?

The BQ27530YZFR-G1 achieves sub-1% SOC accuracy through its patented Impedance Track™ algorithm, which continuously models battery impedance using real-time voltage, current, and temperature measurements. It leverages a 14-bit integrating ADC with ±10 µV offset for coulomb counting, compensates for aging and self-discharge, and refines Qmax and OCV profiles during normal usage. Calibration occurs automatically during charge/discharge cycles, and the algorithm adapts to rate- and temperature-dependent inefficiencies-ensuring consistent accuracy across the battery's lifetime. This behavior is intrinsic to the BQ27530YZFR-G1 architecture and validated per SLUSAL5C datasheet specifications.

Which charger ICs are natively supported by the BQ27530YZFR-G1?

The BQ27530YZFR-G1 is explicitly designed to coordinate with the bq2416x family of single-cell switch-mode battery chargers (e.g., bq24160, bq24161, bq24163) via dedicated push-pull BSCL and BSDA interface pins. These signals enable autonomous charge sequencing-including constant-current/constant-voltage (CCCV) and multi-level charging (MLC)-without host processor involvement. While the BQ27530YZFR-G1 can suggest charge parameters to other chargers via I²C, native hardware-level control and timing synchronization are exclusive to the bq2416x series as confirmed in the device description and functional block diagram of the BQ27530YZFR-G1 datasheet.

What are the power mode options available on the BQ27530YZFR-G1 and their typical current draws?

The BQ27530YZFR-G1 supports five power modes: NORMAL (118 µA typical), SLEEP+ (62 µA), SLEEP (23 µA), HIBERNATE (8 µA), and BAT INSERT CHECK (low-power halted state). Mode transitions are automatic based on current thresholds and events-or can be initiated by host commands. SLEEP mode activates when AverageCurrent() falls below a programmable threshold and triggers coulomb counter autocalibration before entry. HIBERNATE offers lowest power while retaining wake capability via I²C or I/O activity. All values are specified at TA = 25°C, VREGIN = 3.6 V and documented in Section 6.5 of the BQ27530YZFR-G1 datasheet.

Can the BQ27530YZFR-G1 operate without an external thermistor?

Yes, the BQ27530YZFR-G1 can operate using its internal temperature sensor instead of an external thermistor. However, external sensing via TS and BI/TOUT pins-with a 10.0 kΩ ±1% NTC (e.g., Semitec 103AT) and 18.2 kΩ pull-up-is recommended for higher accuracy across –40°C to 85°C. The internal sensor is suitable for coarse thermal monitoring where ±3°C error is acceptable, while the external path enables tighter fuel gauging and protection decisions. Configuration is controlled via data flash settings, and both paths feed the same Impedance Track™ algorithm. This dual-sensing capability is a defined feature of the BQ27530YZFR-G1 per Section 7.3.1 of SLUSAL5C.