ISL91110IIAZ-T

The ISL91110IR is a high-current buck-boost switching regulator for systems using new battery chemistries. It uses Intersil’s proprietary buck-boost algorithm to maintain voltage regulation while providing excellent efficiency and very low output voltage ripple when the input voltage is close to the output voltage. The ISL91110IR is capable of delivering at least 2A continuous output current (V₀UT = 3.3V) over a battery voltage range of 2.5V to 4.35V. This maximizes the energy utilization of advanced single-cell Li-ion battery chemistries that have significant capacity left at voltages below the system voltage. Its fully synchronous low ON-resistance 4-switch architecture and a low quiescent current of only 35μA optimize efficiency under all load conditions. The ISL91110IR supports standalone applications with a fixed 3.3V or 3.5V output voltage or adjustable output voltage with an external resistor divider. Output voltages as low as 1V or as high as 5.2V are supported. The ISL91110IR requires only a single inductor and very few external components. Power supply solution size is minimized by its 2.5MHz switching frequency, allowing small size external components. The ISL91110IR is available in a 4mmx4mm, 20 Ld TQFN package.

Applications

• Smartphones and tablet PCs
• Wireless communication devices
• Optical modules networking equipment

Key features

• Accepts input voltages above or below regulated output voltage
• Automatic and seamless transitions between buck and boost modes
• Input voltage range: 1.8V to 5.5V
• Output current: up to 2A (PVIN = 3.4V, V₀UT = 5V)
• Output current: up to 2A (PVIN = 2.5V, V₀UT = 3.3V)
• Burst current: up to 3A (PVIN = 2.9V, V₀UT = 3.3V, t₀N < 600μs, t = 4.6ms)
• High efficiency: up to 95%
• 35μA quiescent current maximizes light load efficiency
• 2.5MHz switching frequency minimizes external component size
• Fully protected for short-circuit, over-temperature and undervoltage
• Small 4mmx4mm 20 Ld TQFN package