Solutions for Primary Batteries
Solutions for Applications powered by Primary Batteries
For consumer applications requiring low power consumption
Primary batteries are found in many common consumer products such as remote-control garage door openers, remote automobile door locks, home smoke detectors, and also in Utility meters for monitoring the consumption of water and heat in our homes.
There are various types of primary battery, but the basic principles remain the same, with designers always needing, small, highly efficient solutions that can operate with low power consumption to maximise battery life. It is also helpful to be able to disconnect the battery from the system after mass production to conserve battery life during transit to the retailer and consumer. Torex offers a variety of different solutions to tackle these issues as outlined in the article below
Application Example: Step-up DC/DC Converter for MCU
Using a single Li Battery or Dry Cell Batteries to power the MCU with a DC/DC converter.
Key requirements:
- High efficiency DC/DC with low output ripple and low EMI
- Small size, ultra-low power consumption to prolong battery life
Recommended Solution:
|
Circuit Block |
Torex Series |
Key Features |
|---|---|---|
| (1) Step-up DC/DC | XCL103 | Inductor built-in, PWM/PFM, 3MHz, 450mA@3.3V→5V |
| XC9145 | PWM/PFM, 1.2MHz, 430mA@3.3V→5V, Ultra Low Iq, Iq=400nA | |
| XC9148 | PWM/PFM, 1.2MHz/3MHz, 750mA@3.3V→5V, Low RON Bypass function | |
| (2) RESET IC | XC6136 | Iq=100nA class Ultra Low Iq |
Operation and purpose:
(1) Step-up DC/DC for MCU
- For low power consumption
- General usage: Always step-up
- High efficiency, including a light load, is achieved using an Iq = 400nA Ultra Low Iq PWM/PFM control step-up voltage for normal operation.
- High efficiency, including a light load, is achieved using an Iq = 400nA Ultra Low Iq PWM/PFM control step-up voltage for normal operation.
- Low power consumption method: Step-up only when the MCU is active
- Step-up voltage only when it is necessary to use a product with a "Bypass" function, and when the MCU is sleeping, low power consumption is used while battery voltage is being supplied.
- Step-up voltage only when it is necessary to use a product with a "Bypass" function, and when the MCU is sleeping, low power consumption is used while battery voltage is being supplied.
- General usage: Always step-up
- For small size and low EMI
- Micro DC/DC with integrated Coil, the XCL103 is ultra-small and offers very low EMI.
Application Example: Directly powering the MCU
Using a single Li Battery or Dry Cell Batteries to directly power the MCU.
Key requirements:
- Discharge prevention of battery at shipment / Countermeasure for system freeze
- Low EMI and low ripple Step-up DC/DC for RF / Sensor
Recommended Solution:
|
Circuit Block |
Torex Series |
Key Features |
|---|---|---|
| (3) Push Button SW | XC6194 | ISTB=1nA, Ship (shutdown at shipment), Counter system freeze, Preventing battery liquid leakage |
| (4) Step-up DC/DC | XCL102/3 | Inductor built-in, PWM/PFM, 3MHz, 450mA@3.3V→5V |
| XC9145 | PWM/PFM, 1.2MHz, 430mA@3.3→5V Ultra Low Iq, Iq=400nA | |
| XC9147/8 | PWM/PFM, 1.2MHz/3MHz, 750mA@3.3→5V | |
| (5) RESET IC | XC6136 | Iq=100nA class Ultra Low Iq |
Operation and purpose:
(3) Push button load SW with built-in Ship function
The added Push button load SW XC6194 with built-in Ship function (shutdown during shipment) makes the discharge current from the battery during shipment to 1nA. Also suitable for use as a main power switch, forced turn off when the system freezes, and preventing liquid leakage from a battery.
(4) Ultra low Iq Step-down DC/DC for MCU
- For lowest power consumption
- Boost only when the sensor / RF is operating and shut off when unnecessary with the “Load disconnection function".
- The XCL102/03 Micro DC/DC with integrated Coil offers a smaller solution size with improved EMI performance>
- For Always-on RF / Sensor
- The XC9145, Ultra Low Iq PWM/PFM control with Iq = 400nA, always provides high efficiency.