Low Power Design Tool by Texas Instruments

Calculate power consumption, battery life, and optimize low-power designs for embedded systems.

Basic Calculator
Advanced Calculator
Battery Life

Power Consumption Formula: P = V × I

Energy Consumption: E = P × t = V × I × t

Battery Life: T = Battery Capacity (mAh) / Current (mA)

V
Supply voltage of your circuit
mA
Current consumption during active mode
mA
Current consumption during sleep mode
%
Percentage of time in active mode
Calculating...

Understanding Low Power Design

Low power design is critical for battery-operated devices, IoT applications, and energy-harvesting systems. Texas Instruments provides a wide range of low-power microcontrollers, power management ICs, and wireless connectivity solutions.

Key Concepts in Low Power Design:

  • Active Power: Power consumed when device is actively processing
  • Sleep/Standby Power: Power consumed when device is in low-power mode
  • Duty Cycling: Technique of alternating between active and sleep modes
  • Energy Harvesting: Capturing ambient energy to power devices

TI Low Power Product Categories

MSP430 Microcontrollers
Ultra-low-power MCUs for battery-powered applications
Active: 100 µA/MHz Sleep: 0.5 µA 16-bit RISC
CC13xx/CC26xx Wireless MCUs
Low-power wireless microcontrollers
Bluetooth Low Energy Zigbee, Thread Active: 2.6 mA
TPS Series PMICs
Power management integrated circuits
High efficiency Ultra-low Iq Multiple outputs
SimpleLink Platform
Low-power wireless connectivity
Wi-Fi Bluetooth Sub-1 GHz

Power Consumption Classification

Power Level Active Power Sleep Power Typical Applications
Ultra-Low Power < 1 µA < 100 nA Energy harvesting, medical implants
Low Power 1-100 µA 100 nA - 1 µA Wearables, IoT sensors
Moderate Power 100 µA - 10 mA 1-100 µA Portable devices, remote controls
High Power 10-100 mA 100 µA - 1 mA Smartphones, tablets
Very High Power > 100 mA > 1 mA Laptops, servers

Battery Life Estimation

Battery life is a critical factor in low-power design. The calculator considers multiple factors including battery capacity, voltage, average current consumption, and duty cycle.

Battery Life Formulas:

Battery Life (hours) = Battery Capacity (mAh) / Average Current (mA)

Average Current = (Active Current × Duty Cycle) + (Sleep Current × (100 - Duty Cycle))

Battery Life (days) = Battery Life (hours) / 24

Low Power Design Techniques

1

Duty Cycling: Minimize active time by using efficient sleep modes

2

Clock Gating: Disable clock signals to unused modules

3

Power Gating: Turn off power to unused circuit blocks

4

Voltage Scaling: Reduce operating voltage when possible

5

Peripheral Management: Disable peripherals when not in use

TI Design Resources

  • TI Designs: Reference designs for various low-power applications
  • Power Management Guide: Selection guide for power ICs
  • WEBENCH® Power Designer: Online design and simulation tool
  • Application Notes: Detailed technical documentation
  • E2E Community: Technical support forums

Design Note: Actual battery life may vary based on environmental conditions, battery aging, and circuit implementation. Always test your design under real-world conditions. Consider using TI's Power Estimation Spreadsheets for more accurate calculations.

Frequently Asked Questions

Duty cycle refers to the percentage of time a device spends in active mode versus sleep mode. For example, a 10% duty cycle means the device is active for 10% of the time and in low-power sleep mode for 90% of the time. This is crucial for battery life optimization because most low-power devices spend the majority of their time in sleep mode to conserve energy.

Several strategies can reduce power consumption: 1) Select a microcontroller with low sleep current (like TI's MSP430), 2) Implement efficient duty cycling, 3) Use low-power peripherals and disable unused ones, 4) Reduce operating voltage when possible, 5) Optimize software to minimize active time, 6) Use low-power wireless protocols like Bluetooth Low Energy, and 7) Implement power gating for unused circuit sections.

mAh (milliamp-hours) measures battery capacity in terms of current over time. Wh (watt-hours) measures energy capacity. To convert mAh to Wh, multiply mAh by voltage (V) and divide by 1000: Wh = (mAh × V) / 1000. Wh is more accurate for comparing batteries with different voltages because it accounts for both current and voltage.

The MSP430 family is TI's flagship ultra-low-power microcontroller series, with some devices consuming as little as 100 µA/MHz in active mode and 0.1 µA in standby mode. For wireless applications, the CC13xx and CC26xx SimpleLink wireless MCUs offer excellent power efficiency with integrated radio functionality. The best choice depends on your specific requirements for processing power, memory, peripherals, and connectivity.

This calculator provides a theoretical estimation based on simplified models. Actual battery life can vary significantly due to factors like battery aging, temperature effects, voltage regulator efficiency, and real-world usage patterns. For critical applications, TI recommends using their more advanced tools like the Power Estimation Spreadsheets and performing real-world testing under expected operating conditions.