A supercapacitor, also known as an electrical double-layer capacitor (EDLC), has features such as short charging time, high power density, long lifecycles, good temperature performance, and environmental protection. EDLCs can be used to replace traditional batteries (with defects such as electrolyte leakage) as a backup power supply. The EDLC's power can be used for data backup, wireless communication, etc. when the power is turned off for a few minutes.

Renesas' smart power meter solution is integrated with 4G communication and the EDLC to achieve a smart control and always-on system. The ISL85403 buck-boost regulator achieves self-cycling EDLC backup and could discharge the EDLC voltage as low as 0.1V (theoretically). This greatly improves the EDLC's efficiency and reduces the system cost. Additionally, the RL78/L13 microcontroller (MCU) is ideal for measurement devices and power meters with ultra-low power and a built-in segment LCD driver.

System Benefits:

  • The ISL85403 buck-boost regulator can fully utilize the power of supercapacitors (can be as low as 0.3V)
  • Low-cost 16-bit RL78/L13 MCU with ultra-low power and a segment LCD driver
  • The best solution for battery - and EDLC-based always-on systems



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4:3 ratio Sheet.1 Sheet.2 Sheet.3 Sheet.4 CN267 cn267 CN267 4G Module 4G Module 4G Module Voltage Supervisor Voltage Supervisor Voltage Supervisor MOSFET MOSFET MOSFET Inductor Iron Core Line.841 Inductor Air Core.212 Sheet.30 Sheet.31 Sheet.32 Sheet.33 Sheet.34 Sheet.35 Sheet.36 Sheet.37 Sheet.38 Line.29 Ground (earth) Sheet.41 Sheet.42 Sheet.43 Sheet.44 Capacitor Non-polarized Sheet.48 Sheet.49 Sheet.50 Sheet.51 Diode - Zener Sheet.57 Sheet.58 Sheet.59 Diode - Zener.60 Sheet.61 Sheet.62 Sheet.63 Capacitor Non-polarized .64 Sheet.65 Sheet.66 Sheet.67 Sheet.68 Diode - Zener.81 Sheet.82 Sheet.83 Sheet.84 Ground (earth).85 Sheet.86 Sheet.87 Sheet.88 Sheet.89 Resistor - Fixed.90 Resistor - Fixed.91 Ground (earth).92 Sheet.93 Sheet.94 Sheet.95 Sheet.96 Transformer Line.841 Line.842 Inductor Iron Core.111 Line.841 Inductor Air Core.212 Sheet.114 Sheet.115 Sheet.116 Sheet.117 Sheet.118 Sheet.119 Sheet.120 Sheet.121 Sheet.122 Line.29 LCD/LED Segment Display Sheet.126 Sheet.127 Sheet.128 Sheet.129 Sheet.130 Sheet.131 Sheet.132 Sheet.133 Sheet.134 Sheet.135 Sheet.136 Sheet.137 Sheet.138 Sheet.139 Sheet.140 Sheet.141 Sheet.142 Sheet.143 Sheet.144 Sheet.145 Sheet.146 Sheet.147 Sheet.148 Sheet.149 Sheet.150 Sheet.151 Sheet.152 Sheet.153 Sheet.154 Sheet.155 ON ON Sheet.156 OFF OFF Sheet.157 Sheet.158 Sheet.159 Sheet.160 Sheet.161 Sheet.162 Sheet.163 Sheet.164 Sheet.167 Resistor - Fixed.69 Resistor - Fixed.70 Ground (earth).76 Sheet.77 Sheet.78 Sheet.79 Sheet.80 Sheet.168 Sheet.169 Sheet.170 Sheet.171 Sheet.172 Sheet.173 Sheet.174 Sheet.177 Sheet.179 Sheet.181 IGBT Insulated Gate Bipolar Transistor 2 Sheet.21 Sheet.22 Sheet.23 Sheet.24 Sheet.25 Sheet.26 Sheet.180 Resistor - Fixed Input Sheet.182 Connector 1.165 Connector 1.165.184 Connector 1.165.185 Sheet.186 Sheet.187 Sheet.189 LCD LCD LCD Sheet.192 Sheet.193 To Charge the SuperCap To Charge the SuperCap To Charge the SuperCap Reference Reference Reference VIN (12V) VIN (12V) VIN(12V) Connector 1.165.199 Sheet.200 Resistor - Fixed.69 Resistor - Fixed.70 Ground (earth).76 Sheet.204 Sheet.205 Sheet.206 Sheet.207 Connector 1.208 Sheet.209 Connector 1.165.210 Sheet.211 Sheet.212 Sheet.213 Sheet.214 Sheet.215 Connector 1.165.216 Connector 1.165.217 Sheet.219 Sheet.220 Sheet.221 Connector 1.165.222 Connector 1.165.223 Sheet.224 Sheet.225 Sheet.226 Connector 1.165.227 Connector 1.165.228 Sheet.229 Sheet.230 Connector 1.165.233 Connector 1.165.234 AC/DC AC/DC AC/DC Sheet.238 Power Line Power Line Power Line EDLC EDLC EDLC 4V/2.5A (max) 4V/2.5A (max) 4V/2.5A (max) VIN (12V) VIN (12V) VIN(12V) Buck Regulator Buck Regulator Buck Regulator Buck Regulator VCC VCC VCC EXT-BOOST EXT-BOOST EXT-BOOST PHASE PHASE PHASE LGATE LGATE LGATE VIN VIN VIN AUXVCC AUXVCC AUXVCC MCU MCU MCU MCU SPI SPI SPI LCDC LCDC LCDC RST RST RST
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