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IC-DC Datasheet(PDF) 11 Page - IC-Haus GmbH |
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IC-DC Datasheet(HTML) 11 Page - IC-Haus GmbH |
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11 / 19 page  preliminary preliminary iC-DC 2-CHANNEL BUCK/BOOST DC/DC CONVERTER Rev A3, Page 11/19 DESCRIPTION OF FUNCTIONS DC/DC converter iC-DC generates two regulated volt- ages of VH1 and VH2 from voltage VBR. These presta- bilize the two linear regulators VCC1 and VCC2. A third voltage of VH, also regulated, is generated to drive these linear regulators. Voltage supply VB may be either above or below the output voltages. Figure 1 shoes the basic function principle of iC-DC. Switches S1 to S6 and diode D1 have been implemented on the chip. The inductor, capacitors, and load resistors are external devices. RVH2 CVH2 RVH RVH1 CVH CVH1 S2 S4 S5 S6 S3 D1 VH VH1 VH2 VHL VBR VBL VB LVBH S1 LVBH S1 S3 D1 S2 S4 S5 S6 CVH CVH1 CVH2 RVH RVH1 RVH2 Figure 1: Principle of operation of the converter Another feature of iC-DC is that bias voltages VH1 and VH2 adjust themselves automatically to approximately 400 mV using the selected VCC1 or VCC2 voltage. This results in minimum power dissipation as only a low amount of voltage is lost through each of the linear regulators. Charge/discharge phase During the charge phase switches S1 and S2 close with the internal clock. A linearly increasing current flows through coil LVBH. The energy from supply VBR is stored in the coil’s magnetic field. Switches S1 and S2 open for discharging. Switch S3 and one of the switches S4/S5/S6 are closed. The cur- rent can continue to flow in the coil and is supplied to the relevant capacitor and relevant load. Figure 2 de- scribes the resulting course of the current and voltage. The current rise and fall times depend on the inductor voltage. Dual 3.3V/5V BOOST/BUCK SMPS, 05.05.2008 11:51:33 V(VHL) 8.887ms 8.888ms 8.889ms 8.89ms Time (linear) [Plot 0] 0 2V 4V 6V 8V V(VBL) -1V 0 1V 2V 3V 4V I(LVBH) 0 100mA 200mA 300mA 400mA Figure 2: Converter current/voltage characteristics (VB = 4 V) |
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