SOURCE: Intersil


August 22, 2011 10:00 ET

Industry's First I2C Controlled Buck-Boost Regulator Allows "On-the-Fly" Output Voltage Programming

Flexible, Compact ISL9112 Simplifies Design by Supporting Input Voltages Either Above or Below Output Voltage

MILPITAS, CA--(Marketwire - Aug 22, 2011) - Intersil Corporation (NASDAQ: ISIL) today introduced the world's first I2C controlled buck-boost regulator, delivering a highly flexible solution for providing a regulated output voltage from a varying input voltage. The ISL9112 is a compact, high efficiency 2.5MHz, 1.2A buck-boost regulator designed for applications that require I2C programmability, and utilizes Intersil's proprietary H-Bridge Buck-Boost architecture. The I2C interface allows output voltages to be changed instantaneously or ramped between two values.

The ISL9112 simplifies design by providing a regulated output voltage from an input that can be either above or below the output voltage. The regulator minimizes external components, requiring just a single inductor and two capacitors. It also features the industry's lowest voltage deviation during transitions between buck and boost modes, providing designers with flexibility in selecting the optimal output voltage. The ISL9112's 2.5MHz switching frequency is also the highest available in 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 (the industry's highest current capability in a tiny 3x3mm footprint). Output voltages can be programmed down to 1.9V or up to 5.0V, which is ideal for camera flash LED drives, RF power amplifiers and other functions with varying supply voltage requirements.

Features and Benefits

  • Input voltage as low as 1.8V (ideal for alkaline or NiMH battery powered systems)
  • Up to 95% efficiency in buck (step-down) mode
  • Over-current, under-voltage and over-temperature shutdown
  • Mode/Sync pin controls PFM/PWM operation and switching frequency
  • Switching frequency can be synchronized up to 3.25MHz

Pricing and Availability
The ISL9112 is available now in a compact 12-pin, 3x3mm TDFN package. Pricing starts at $2.13 each in 1,000-piece quantities. For more information please visit

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About Intersil
Intersil Corporation is a leader in the design and manufacture of high-performance analog, mixed-signal and power management semiconductors. The Company's products address some of the fastest growing markets within the communications, computing, high-end consumer and industrial electronics markets. For more information about Intersil or to find out how to become a member of our winning team, visit the Company's web site and career page at

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