The smart terminal backup power system has a wide input voltage range which supports from 4.5V to 40V with 1A to 20A output. A supercapacitor can be used to replace the traditional battery (with defects such as electrolyte leakage) as a backup power supply.

In this solution, the ISL81401 buck-boost controller can work in buck, boost or buck-boost mode with bidirectional CC/CV mode support, and can replace two-part solutions available from competitors. The charge time can be programed as needed, and discharge time can be optimized to fully discharge the energy. ISL81401 can discharge the capacitor energy as much as the present electronic components, which maximizes the use of capacitive energy and helps save cost. 

System benefits

  • ISL81401 can fully extract the power of supercapacitor (can be as low as 0.3V) 
  • ISL88002 voltage supervisor to monitor the power status
  • RJK03M5DNS N-MOSFET support for high-efficiency drive and low heat design

Related Products

Product Description Featured Document Ordering
Buck-Boost Regulator      
ISL81401 40V Bidirectional 4-Switch Synchronous Buck-Boost Controller Datasheet Buy/Sample
RJK03M5DNS N-channel Single Power MOSFET, 30V, 25A, 6.3mΩ, HWSON-8 Datasheet Buy/Sample
Voltage Supervisor      
ISL88002 Ultra-Low Power 3Ld Voltage Supervisor in SC-70 and SOT-23 Packages Datasheet Buy/Sample