Intersil has developed a 1.2A buck-boost regulator using a proprietary H-Bridge buck-boost control architecture.

The ISL9110 provides a regulated output voltage from an input that can be either above or below the output voltage.

Intersil has also introduced a version which can be I2C controlled. The ISL9112 uses the same H-Bridge buck-boost architecture and the I2C interface allows output voltages to be changed instantaneously or ramped between two values.

The regulator requires just a single inductor and two capacitors.

A feature is its low voltage deviation during transitions between buck and boost modes, this aids designers in selecting the optimal output voltage.

The ISL9110's 2.5MHz switching frequency is also high for a buck-boost regulator, further minimizing external component sizes.

The device can deliver more than 2A at 2Vout or 1.2A at 3.0Vout from a single li-ion battery.

External feedback resistors can set the output voltage on the ISL9110's adjustable version to deliver output voltages as low as 1V, an important capability for loads such as RF power amplifiers.

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