Texas Instruments BQ27200DRKR

Overview

BQ27200DRKR from Texas Instruments is a single-cell Li-Ion/Li-Pol battery gas gauge IC with I²C interface, reporting time-to-empty, state-of-charge, voltage (±25 mV accuracy), temperature (±3 °K), and coulometric current (±1.7% gain variability). It operates directly from the battery (2.6–4.5 V) and targets portable electronics requiring autonomous capacity monitoring without user calibration.

For engineers reviewing the BQ27200DRKR datasheet, BQ27200DRKR pinout, BQ27200DRKR application, or BQ27200DRKR equivalent, key selection criteria include its 3 mm × 4 mm QFN package, I²C communication timing compliance (100 kHz, 4.7 µs bus free time), five low-power modes (sleep < 2.5 µA), integrated auto-calibrating Delta-Sigma Coulomb Counter, and EDV-based dynamic end-of-discharge detection for high-dynamic load environments.

Technical Context

The BQ27200DRKR implements a fully differential Delta-Sigma Coulomb Counter (DSCC) for charge/discharge integration across an external sense resistor, with automatic internal offset calibration and programmable Digital Magnitude Filter (DMF) threshold (4.9 µV steps). Its ADC measures battery voltage and integrated temperature sensor output with 2.7 mV and 0.25 °K resolution respectively.

Compensation logic applies real-time corrections for self-discharge, aging, temperature, and discharge rate to deliver compensated available capacity and time-to-empty estimates. The device uses a stable internal oscillator (±1.5% tolerance) and supports dynamic EDV detection delay (3–21.5 s) synchronized to remaining state-of-charge to prevent false low-battery triggers under transient loads.

Key Specifications

Pinout & Package

Package: 3 mm × 4 mm QFN-11 with exposed thermal pad (DRK), lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery gas gauge applications.

Compared with BQ27200DRKR, BQ27426YZFT offers tighter measurement tolerances and enhanced algorithms but demands updated host firmware and layout; BQ27510-G3YZFT adds security and protection features at the cost of increased complexity and non-interchangeable EEPROM structure.

Availability

BQ27200DRKR is available at Aetrix Electronics and suitable for smartphones, digital cameras, MP3 players, and internet appliances requiring stable component supply and long-lifecycle support for legacy portable designs.

Supply support for BQ27200DRKR 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 decades of leadership in battery management solutions.

The bqJUNIOR™ series-including BQ27200DRKR-is designed specifically for space-constrained, single-cell Li-Ion/Li-Pol portable applications requiring autonomous, high-accuracy fuel gauging without user calibration or external components.

FAQ

What communication interface does the BQ27200DRKR use?

The BQ27200DRKR uses a standard-mode I²C interface (SCL/SDA) operating at 100 kHz, with defined timing parameters including 4.7 µs bus free time and 300 ns SDA fall time. It does not support HDQ-this is exclusive to the bq27000 variant. The I²C interface enables bidirectional register access for reading time-to-empty, voltage, temperature, and state-of-charge data, as well as writing configuration values to EEPROM locations such as DMFSD or SEDV1.

Does the BQ27200DRKR require external calibration?

No, the BQ27200DRKR requires no user calibration. It performs automatic internal offset calibration of its Delta-Sigma Coulomb Counter during operation and at power-up. External PCB-induced offset can be measured using the CEO command and programmed into EEPROM for compensation, but this is optional and manufacturing-focused. The BQ27200DRKR delivers accurate capacity reporting out-of-box across its operating temperature range (-20°C to 70°C) and supply range (2.6 V to 4.5 V).

What is the function of the RBI pin on the BQ27200DRKR?

The RBI pin on the BQ27200DRKR provides register backup during VCC brownout. When VCC drops below the 2.0 V POR threshold, the RBI pin sustains internal RAM contents using charge stored on an external capacitor. An optional 1 MΩ resistor from RBI to VCC extends retention time when VCC remains above 1.3 V. This ensures critical registers-including NAC, LMD, CYCL, and FLAGS-retain valid data across brief power interruptions, preserving learned capacity and cycle count integrity without requiring host reinitialization.

How does the BQ27200DRKR handle dynamic load conditions during end-of-discharge detection?

The BQ27200DRKR implements dynamic end-of-discharge (EDV) detection delay that scales from 21.5 seconds at ≥6% remaining state-of-charge (RSOC) down to 3 seconds at 0% RSOC. This adaptive timing prevents premature EDV assertion caused by transient voltage sags under high-dynamic loads (e.g., camera flash, RF transmission). The delay adjustment is internal and automatic-no host configuration is needed-and works in conjunction with EDV1/EDVF threshold registers to ensure robust low-battery signaling aligned with actual usable capacity.

What power-saving modes are available on the BQ27200DRKR?

The BQ27200DRKR supports five low-power operating modes: Active (<90 µA), Sleep (<2.5 µA), Hibernate (<1.5 µA), Data Retention (<20 nA), and (for bq27000 only) Ship mode. Sleep mode activates automatically when I²C lines remain idle for >100 ms due to internal 2.7–4.5 µA pull-downs on SCL/SDA. Hibernate engages when VCC falls below 1.5 V, and Data Retention maintains RAM state with nanoampere current when VCC is near zero. These modes collectively minimize battery drain in portable systems during standby, transport, or storage.