| A boost DC/DC converter with an input supply voltage range from 2.7 volts to 5.5 volts has been designed in this paper, which could power by one cell Li-ion batteries, could deliver up to 200mA load current with a steady output voltage as high as 18 volts. The voltage controlled PWM modulation mode was used in the converter with a built-in 1.5MHz frequency oscillator. Synchronous rectification technology was used to improve system efficiency. Additional features include thermal shutdown protection and under voltage lockout protection, which enhance the reliability of the system.This system contains many functional blocks, such as the bandgap reference, the LDO regulator, the amplifier, the clamp circuit, the PWM comparator, the oscillator and the compensation circuit. Under Cadence design environment, the simulation of the circuit and system is completed based on BCD6S process. These results of simulation indicate the circuit design according with the requirement. |
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