IC-DC datasheet(2/19 Pages) ICHAUS

2 / 19 page

preliminary

iC-DC

2-CHANNEL BUCK/BOOST DC/DC CONVERTER

Rev A3, 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-

conﬁgured within a range of 1.5 to 5.5 V. The switch-

ing converter supplies up to 300 mA which can be

drawn from the two linear regulators in the ratio re-

quired.

The intermediate voltages of the two on-chip linear

regulators are adjusted to minimize their drop-out

voltages. 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 ex-

ternal components, a DC/DC power pack can be cre-

ated 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

reverse polarity protection are monitored and errors

signaled by current-limited open-collector outputs.

With overtemperature the switching converter is dis-

abled 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 out-

put 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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