Intersil – ISL91127 and ISL91128: High Ef ciency, High Current Single Inductor Buck-Boost Regulators

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The ISL91127 and ISL91128 operate in buck, boost or buck-boost mode, depending on the relation between input and output voltages, and provide smooth transitions between modes to prevent noise and glitches. This capability, combined with patented Intersil technology for delivering superior light-load efficiency with ultra- low quiescent current, maximizes efficiency under all conditions. This is essential to improve battery life by reducing power drain and heat dissipation in portable and mobile applications.

FEATURES
• 30μA typical quiescent current
• Up to 3A output current in boost mode
• Adjustable or fixed 3.3V output voltage
• Full protection for under-voltage, short circuit, and thermal faults
• I2C dynamic voltage adjustability (ISL91128)
• Up to 96% efficiency
• 1.8V to 5.5V input voltage range
• 2.5MHz switching frequency
• WLCSP-20 or QFN-20 packages
• 1k MSRP: Starts from $1.25 US

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