IC-DC datasheet(2/19 Pages) ICHAUS

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iC-DC

2-CHANNEL BUCK/BOOST DC/DC CONVERTER

Rev B1, Page 2/19

DESCRIPTION

iC-DC is a monolithic switching converter with two

back-end linear regulators. The output voltages of

the two linear regulators can be individually pin-con-

figured within a range of 1.5 to 5.5 V. The switching

converter supplies up to 300 mA which can be drawn

from the two linear regulators in the ratio required.

The intermediate voltages of the two on-chip linear

regulators are adjusted to minimize their drop-out volt-

ages. These are approximately 400 mV above the set

linear regulator output voltages.

The high efficiency of the buck/boost converter for an

input voltage range of +4 V to +36 V makes iC-DC

suitable for industrial applications. Using very few

external components, a DC/DC power pack can be

created with a stabilized supply voltage and minimum

power dissipation.

iC-DC is ideal for sensor applications thanks to its

minimal power loss, few components, and stabilized

supply. Switching transistors, flyback diodes, and

an oscillator are integrated in the device so that the

only external elements needed are an inductor, the

back-up capacitors, and a reference resistor.

The back-end linear regulators have a very low resid-

ual ripple with comparatively small filter capacitors in

the single-digit µF range.

By using two independent regulators voltages can be

decoupled from sensitive analog circuits and driver

devices, for example.

The chip temperature, input voltage, and integrated re-

verse polarity protection are monitored and errors sig-

naled by current-limited open-collector outputs. With

overtemperature the switching converter is disabled

to reduce the chip’s power dissipation.

The linear regulator output voltages are monitored

and once having reached the steady state they are

also switched to outputs POE1 and POE2. The output

voltages of the two linear regulators VCC1 and VCC2

can be switched on and off by two separate inputs.

The device’s standby function can be activated to

minimize the current consumption.

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