Up to 96% efficiency and industry's lowest quiescent current makes new ISL91127 and ISL91128 ideal for low-voltage, battery-operated systems
Intersil Corporation announced the ISL91127 and ISL91128 high efficiency buck-boost regulators. The latest in Intersil's industry-leading buck-boost family, the new devices feature 4.5 A switches, best-in-class efficiency up to 96%, and a compact footprint ideal for providing system power or powering the peripherals in battery-operated devices. They offer the industry's lowest quiescent current of 30 µA for superior light load efficiency.
In hand-held device applications where the input voltage may be higher or lower than the output voltage, buck-boost regulators improve efficiency and provide longer battery life compared to a boost regulator plus bypass solution. With increasing demands for smaller and smaller footprints, Intersil's ISL9112x compact QFN and WLCSP packages enable power designs that maximize efficiency while providing flexibility and ease of design.
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.
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| The ISL91128Typical Application. |
The new buck-boost regulators' wide input voltage range of 1.8 V to 5.5 V supports multiple battery topologies, and their wide output voltage range of 1 V to 5.2 V combined with 3 A output current provide the ultimate in design flexibility. The ISL91128 also features I2C programmable dynamic output voltage adjustability, which eliminates feedback resistors and allows the reuse of the same design for multiple output voltage needs.
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| The ISL91128 Efficiency: VOUT = 3.3 V, TA = +25 °C. |
Key Features and Specifications of ISL91127 and ISL91128
- 30 µA typical quiescent current: the lowest of any high current buck-boost in the industry
- Up to 96% efficiency (VIN = 3.6 V, VOUT = 3.4 V~4 V, IOUT = 200 mA)
- Output current up to 3 A in boost mode (VIN = 3 V, VOUT = 3.3 V)
- Input voltage can range from 1.8 to 5.5 V, output voltage can be adjustable or fixed at 3.3 V
- Full protection for under-voltage, short-circuit, and thermal faults to ensure safe operating conditions and reliable system operation
- ISL91128 offers I2C dynamic voltage adjustability for output voltage, and ringing suppression for superior EMI performance
Pricing and Availability
The ISL91127IR is available now in a 4 mm × 4 mm, 20-pin QFN package and is priced at $1.29 USD in 1k quantities. The ISL91127 is also available in a 20-bump, 2.15 mm × 1.74 mm WLCSP package priced at $1.25. The ISL91127IRN-EVZ fixed 3.3 V evaluation board and ISL91127IRA-EVZ adjustable voltage evaluation board are available for purchase.
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| ISL91127IRA-EVZ Buck-Boost Regulator Board. |
The ISL91128 is available now in a 20-bump, 2.15 mm × 1.74 mm WLCSP package and is priced at $1.25 USD in 1k quantities.
