2

IK3301

Rev. 01

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