A power supply system with a supercapacitor has a wide input voltage range which supports from 3V to 40V with a 2.5A output. A supercapacitor can be used to replace the traditional battery (with defects such as electrolyte leakage) as a backup power supply.

In boost mode, the buck-boost regulator can discharge the capacitor energy as much as the present electronic components, which maximizes the use of capacitive energy and helps save cost. When the load is small, the discharge efficiency can be as high as 82% at 100mA. At high current (1A output), this design can still achieve over 50% discharge efficiency. The high-performance LDO, high-efficiency MOSFET and precise voltage supervisor provide the integrated power system solution.

System Benefits:

  • ISL85403 can fully extract the power of the supercapacitor (can be as low as 0.3V).
  • ISL88002 voltage supervisor to monitor the power status.
  • ISL9001A is a high-performance LDO with low ISUPPLY and high PSRR.
  • RJK03M5DNS N-MOSFET support for high-efficiency drive and low heat design.



Winning Combinations Interactive Diagram

Select a block to discover products for your design

4:3 ratio Sheet.232 Sheet.1 Sheet.2 Sheet.3 Sheet.4 CN274 CN274 CN274 MOSFET MOSFET MOSFET Ref. 2.5V Ref. 2.5V Ref. 2.5V IGBT Insulated Gate Bipolar Transistor 1 Sheet.14 Sheet.15 Sheet.17 Sheet.18 IGBT Insulated Gate Bipolar Transistor 1.19 Sheet.20 Sheet.21 Sheet.22 Sheet.23 Sheet.24 Ground (earth) Sheet.26 Sheet.27 Sheet.28 Sheet.29 Resistor - Fixed Resistor - Fixed.31 Diode -Schottky Sheet.33 Sheet.34 Sheet.35 Sheet.36 Sheet.37 Sheet.38 Sheet.39 Input Input.41 Capacitor Non-polarized Sheet.50 Sheet.51 Sheet.52 Sheet.53 Transformer Inductor Iron Core Line.841 Inductor Air Core.212 Sheet.68 Sheet.69 Sheet.70 Sheet.71 Sheet.72 Sheet.73 Sheet.74 Sheet.75 Sheet.76 Line.29 Diode -Schottky.78 Sheet.79 Sheet.80 Sheet.81 Sheet.82 Sheet.83 Sheet.84 Sheet.85 Capacitor Non-polarized .86 Sheet.87 Sheet.88 Sheet.89 Sheet.90 Ground (earth).91 Sheet.92 Sheet.93 Sheet.94 Sheet.95 Input.96 Resistor - Fixed.97 Resistor - Fixed.98 Resistor - Fixed.99 Ground (earth).100 Sheet.101 Sheet.102 Sheet.103 Sheet.104 Resistor - Fixed.105 Ground (earth).106 Sheet.107 Sheet.108 Sheet.109 Sheet.110 Resistor - Fixed.111 Ground (earth).112 Sheet.113 Sheet.114 Sheet.115 Sheet.116 Resistor - Fixed.117 Resistor - Fixed.118 Capacitor Non-polarized .119 Sheet.120 Sheet.121 Sheet.122 Sheet.123 Transformer Inductor Iron Core.124 Line.841 Inductor Air Core.212 Sheet.127 Sheet.128 Sheet.129 Sheet.130 Sheet.131 Sheet.132 Sheet.133 Sheet.134 Sheet.135 Line.29 Diode -Schottky.137 Sheet.138 Sheet.139 Sheet.140 Sheet.141 Sheet.142 Sheet.143 Sheet.144 Ground (earth).145 Sheet.146 Sheet.147 Sheet.148 Sheet.149 Sheet.150 Sheet.151 Sheet.155 Sheet.156 Sheet.157 Sheet.158 Sheet.164 Sheet.165 Sheet.166 Sheet.167 Sheet.168 Sheet.169 Sheet.170 Sheet.171 Sheet.172 Sheet.173 Sheet.174 Sheet.175 Sheet.180 Sheet.182 3.3V/2.5A(max) 3.3V/2.5A(max) 3.3V/2.5A(max) To charge the SuperCap To charge the SuperCap To charge the SuperCap EDLC EDLC EDLC Vin (13V) Vin (13V) Vin (13V) Sheet.191 Sheet.192 Sheet.193 1.8V/0.3A (max) 1.8V/0.3A (max) 1.8V/0.3A(max) Sheet.195 Sheet.196 Sheet.197 Sheet.198 Sheet.200 Sheet.202 Sheet.209 To MCU ACK To MCU ACK To MCU ACK Connector 1.169 Connector 1.169.223 Connector 1.169.224 Connector 1.169.225 Connector 1.169.226 Connector 1.169.227 Connector 1.169.228 Connector 1.169.229 Connector 1.169.230 Connector 1.169.231 Connector 1.169.233 N-Channel MOSFET Sheet.235 Sheet.236 Sheet.237 Sheet.238 Sheet.239 Sheet.240 Sheet.241 Sheet.242 Sheet.243 Sheet.244 Sheet.245 Sheet.246 Sheet.247 Sheet.248 Connect.50 Sheet.250 Sheet.251 Sheet.252 Connector 1.169.253 Connector 1.169.254 Connector 1.169.255 Connector 1.169.256 Sheet.257 Connector 1.169.258 Connector 1.169.259 Connector 1.169.260 Vin (13V) Vin (13V) Vin (13V) Connector 1.169.262 Sheet.263 LDO LDO LDO VOUT VOUT VOUT VIN VIN VIN EN EN EN Sheet.264 Buck-Boost Regulator Buck-Boost Regulator Buck-Boost Regulator LGATE LGATE LGATE VCC VCC VCC EXT-BOOST EXT-BOOST EXT-BOOST PHASE PHASE PHASE AUXVCC AUXVCC AUXVCC VIN VIN VIN Sheet.265 Voltage Supervisor Voltage Supervisor Voltage Supervisor VDD VDD VDD RST RST RST
Exiting Interactive Block Diagram