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  • MCP1640 Two Cells Input Boost Converter with 12V/50mA Output

  • Created: May 19, 2016

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Summary

Power supplies are very essential in every circuit designs. Nowadays, switched mode power supplies (SMPS) are widespread in circuit designing for it offers higher efficiency as compared to linear power supplies. They are usually used as DC to DC converters. Although a DC supply, such as battery may be available, its voltage is not suitable for the system being supplied especially when it will be used to supply motors in automobiles. The answer to this problem is to use fewer batteries and to boost the available DC voltage to the required level by using a boost converter. This design features MCP1640 synchronous step-up DC to DC converter from Microchip Technology.


This reference design particularly uses MCP1640 boost regulator, which is capable of low start-up voltage and delivers high efficiency over a wide load range for single-cell, two-cell, or three-cell alkaline, NiCd, NiMH and single-cell Li-Ion battery inputs. A high level of integration lowers total system cost, eases implementation and reduces board area. This circuit is especially designed to demonstrate the functionality of MCP1640 device’s high-voltage boost capability above its typical output range of 5.5V. This board boosts the low-voltage input to 12V and up to 70mA load current. By changing specific resistors, a lower/higher output than 12V can be obtained. The MCP1640 Input Boost Converter was developed to help engineers reduce product design cycle time. At 2V input and 12V output, the board is capable of a maximum of 50mA load current.


This design provides a power supply solution for one, two and three cell alkaline and NiMH/NiCd portable products. Also, this is very useful to single-cell Li-Ion to 5V converters and Li Coin cell-powered devices. Other applications also include in personal medical products, wireless sensors, handheld instruments, GPS receivers Bluetooth headsets, and +3.3V to +5V distributed power supply.