2-Channel Buck/Boost DC/DC Converter

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iC-DC is a monolithic switching converter with two back-end linear regulators. The output voltages of the two linear regulators can be individually pinconfigured within a range of 1.5 to 5.5V. The switching converter supplies up to 300mA of current 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 voltages. These are approximately 400mV above the set linear regulator output voltages.

The high efficiency of the buck/boost converter for an input voltage range of 4 to 36V 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

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 on the device so that the only external elements needed are an inductor, the backup
capacitors, and a reference resistor.

The back-end linear regulators have a very low residual 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 reserve polarity protection are monitored and errors signaled 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 are 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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Wide input voltage range of 4 to 36 V
Reverse polarity protection up to -36 V with autarky function
Universal buck/boost converter with high efficiency
Two back-end, adjustable linear regulators (1.5 to 5.5 V) with a
Low residual ripple with small capacitors in the μF range
Separate enable inputs for the linear regulators
Two switched outputs referenced to the linear regulators
Integrated switching transistors and flyback diodes
Converter cut-off current can be set by an external resistor
Integrated 3MHz oscillator with no external components
Active noise spectrum reduction
Error messaging with overtemperature, overvoltage, and
Wide temperature range of -40 to 125C
Protective circuitry against ESD
QFN package requires little space and few external

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