Boost power convertors keep the noise down: News from Catalyst Semiconductor

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Catalyst Semiconductor has expanded its mixed-signal IC product family with the introduction of the CAT3200-5 and CAT3200 boost power convertors. These regulated output charge pumps are designed for very low noise operation implementing a constant switching frequency of 2MHz that allows the use of small 1uF ceramic capacitors. The devices are designed to continuously monitor and control the inrush current during power-up, and are ideal for battery-powered applications.

A shutdown feature disconnects the load from the input and reduces quiescent current to well under 1uA.

The devices can survive a continuous short-circuit from the output to ground.

The CAT3200-5 is a fixed 5V regulated output charge pump power convertor, available in a thin SOT23 package.

It is a general purpose device for handheld applications that require a regulated, or boosted, voltage higher than the supply voltage.

It is designed to address cost critical applications found in wireless and other small handheld devices.

Operating from input voltage down to 2.7V, it is well suited for lithium-ion battery powered devices that require a 5V fixed bias for an ASIC, as well as USB peripherals.

It provides a solution to drive LEDs in parallel, using ballast resistors to set the current, in LCD backlighting and colour indicator applications.

An adjustable output version, the CAT3200, available in an 8-pin MSOP package, is also a general purpose power convertor well suited for driving LEDs in parallel, using an external resistor on the feedback pin to set the LED current.

'With the increasing demand for small, low power consumption portable devices, the need for tighter control of the peak battery current is becoming more critical'.

'The CAT3200 provides a 'soft-start' where the charge pump controls inrush current to an acceptable level, while providing a fully regulated output voltage that uses a 2MHz charge pump that drives loads up to 100mA', said Barr Karagozlu, Product Marketing Manager.

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Boost power convertors keep the noise down

Regulated output charge pumps are designed for very low noise operation implementing a constant switching frequency of 2MHz that allows the use of small 1uF ceramic capacitors.