IK3301
General Description
Figure 1 shows the simplified block diagram of IK3301. The device consists of two highly efficient DC-DC
converters, a negative charge pump, clock generator to supply clock signals to each circuit and reference
voltage generator.
The 15V supply voltage is generated by UP voltage converter, which utilizes one external inductor, one
external capacitor and two external diodes. The internal comparator continuously monitors the output
voltage and adjusts it to 15V by controlling PWM (Pulse Width Modulation) circuit. The 5V supply voltage is
generated by DOWN voltage converter, which utilizes one external inductor, one PFET switch, one external
capacitor and one external diode. The internal comparator continuously monitors the output voltage and
adjusts it to 5V by controlling PWM circuit. The –8V supply voltage is generated by negative charge pump.
This circuit needs two diodes, two external capacitors, and one external inductor. The user can adjust the
output voltages by changing the feedback resistor ratio for all three output voltages.
The reference voltage is generated from internal Band-gap reference circuit and almost constant to the
temperature and the power supply voltage. As a result, 15V, 5V, and -8V voltage outputs are also constant
to temperature and power supply voltage.
Block Diagram
Figure 1. Block Diagram
2011, February, Rev. 02
2
Rev. 01
IKSEMICON [ IK SEMICON CO., LTD ]
