BQ27441DRZT-G1B

Part: bq27441-G1 — Texas Instruments

Type: System-Side Impedance Track™ Fuel Gauge

Description: Single-series-cell Li-Ion battery fuel gauge with integrated LDO, 400-kHz I2C interface, and patented Impedance Track technology providing state-of-charge, remaining capacity, and voltage reporting.

Operating Conditions:

• Operating free-air temperature range: -40 to 85 °C
• External pullup voltage for open-drain pins (SDA, SCL, GPOUT): 1.62 to 3.6 V

Absolute Maximum Ratings:

• Max supply voltage (BAT pin): 6 V
• Max input voltage (SDA, SCL): 6 V
• Max input voltage (SRP, SRN): VBAT + 0.3 V
• Max differential voltage across SRP and SRN: 2 V
• Max supply voltage (VDD LDO output): 2 V
• Max push-pull IO voltage (BIN): VDD + 0.3 V
• Storage temperature: -65 to 150 °C

Key Specs:

• BAT pin input voltage range: -0.3 to 6 V
• Differential sense voltage ABS(SRP - SRN): 2 V max
• External pullup voltage (VPU) on open-drain pins: 1.62 V (min) to 3.6 V (max)
• External input capacitor for internal LDO (CBAT): 0.1 μF typ
• External output capacitor for internal LDO (CLDO18): 0.47 μF typ
• External sense resistor support: 10 mΩ typical

Features:

• Single series cell Li-Ion battery fuel gauge residing on system board
• Supports embedded or removable batteries
• Powered directly from battery with integrated LDO
• Supports a low-value external sense resistor (10 mΩ)
• Battery fuel gauging based on patented Impedance Track™ technology
• Reports remaining capacity (mAh), state-of-charge (SOC, %), and battery voltage (mV)
• Automatically adjusts for battery aging, self-discharge, temperature, and rate changes
• Microcontroller peripheral with 400-kHz I2C serial interface
• Configurable SOC interrupt or battery low digital output warning
• Internal temperature sensor or host-reported temperature

Applications:

• Smartphones, feature phones, and tablets
• Digital still and video cameras
• Handheld terminals
• MP3 or multimedia players

Package:

• VSON-12 (2.50 mm × 4.00 mm)

• 1 · Single Series Cell Li-Ion Battery Fuel Gauge
• -Resides on System Board
• -Supports Embedded or Removable Batteries
• -Powered Directly from Battery with Integrated LDO
• -Supports a Low-Value External Sense Resistor (10 m Ω )
• Battery Fuel Gauging Based on Patented Impedance Track™ Technology
• -Reports Remaining Capacity and State-ofCharge (SOC) with Smoothing Filter
• -Automatically Adjusts for Battery Aging, Selfdischarge, Temperature, and Rate Changes
• -Battery State-of-Health (Aging) Estimation
• Microcontroller Peripheral Supports:
• -400-kHz I 2 C Serial Interface
• -Configurable SOC Interrupt or Battery Low Digital Output Warning
• -Internal Temperature Sensor or Host-Reported Temperature

• Smartphones, Feature Phones, and Tablets
• Digital Still and Video Cameras
• Handheld Terminals
• MP3 or Multimedia Players

TA = -40°C to 85°C, typical values at TA = 30°C and VREGIN = 3.6 V (unless otherwise noted)(Force Note1)

(1)

over operating free-air temperature range (unless otherwise noted) (1)

TA = 30°C and VREGIN = VBAT = 3.6 V (unless otherwise noted)

The bq27441-G1 fuel gauge is a microcontroller peripheral that provides system-side fuel gauging for single-cell Li-Ion batteries. The device requires minimal configuration and uses One Time Programmable (OTP) NonVolatile Memory (NVM). Battery fuel gauging with the fuel gauge requires connections only to PACK+ and PACK- for a removable battery pack or embedded battery circuit. To allow for optimal performance in the end application, special considerations must be taken to ensure minimization of measurement error through proper printed circuit board (PCB) board layout. Such requirements are detailed in Design Requirements .