Date: 26/08/2011

I2C controlled buck-boost regulator with up to 95% efficiency

Intersil Corporation has introduced the I2C controlled buck-boost regulator, ISL9112, which delivers a highly flexible solution for providing a regulated output voltage from a varying input voltage 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.

Intersil says that ISL9112 has highest switching frequency of 2.5MHz in buck-boost regulator and industry's lowest voltage deviation during transition between buck and boost modes, this offers the designers flexibility in selecting the optimal output voltage, minimizes external component sizes, simplifies design requires a single inductor and two capacitor.

Intesil explains that the device can deliver more than 2A at 2Vout or 1.2A at 3.0Vout from a single Li-Ion battery, output voltages can be programmed down to 1.9V or up to 5.0V, which is used for camera flash LED drives, RF power amplifiers and other functions with varying supply voltage requirements.

Key features and benefits as per Intersil include:
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

Available: Now
Price: $2.13 each in 1K-pieces
Package: 12-pin, 3x3mm TDFN package

Intersil Corporation has also developed ISL9110 a compact, 1.2A buck-boost regulator that uses a proprietary H-Bridge Buck-Boost control architecture suitable for battery-powered devices such as handheld instruments, games, point-of-sale systems and similar applications.

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. The other features are same as ISL9112.

Price: $2.08 each in 1K pieces
Available: Now

For more information visit: www.intersil.com