The ISL91117 is a highly integrated boost switch regulator for battery powered applications. The device provides power solutions for products using two - or three-cell alkaline, NiCd or NiMH, or single-cell lithium-ion or lithium polymer batteries.
Typical fixed output application
Efficiency vs load current (VOUT = 5V)
The ISL91117 is designed for stand-alone applications and supports a fixed 5V output voltage or variable output voltage with an external resistance divider. The size of the power solution is minimized with a 2.34mm x 1.72mm WLCSP and a 2.6MHz switching frequency, which allows the use of tiny, low-size inductors and ceramic capacitors to minimize the size of the solution.
The device is capable of delivering 1.5A output current with PVIN = 3.3V and VOUT = 5V. The use of synchronous rectifiers maximizes efficiency at high loads. The no-load static current is only 35μA, which optimizes the efficiency under light load condition. Forced-pwm and/or external clock synchronization are also options for noise-sensitive applications.
Block Diagram
Features
● Input voltage range: 1.8V to 4.8V
● Fixed 5V or adjustable output
● Output current: up to 1.5A (PVIN = 3.3V, VOUT = 5V)
● High efficiency: up to 96%
● 35µA quiescent current maximizes light-load efficiency
● True input-output disconnect when disabled
● 2.6MHz switching frequency minimizes external component size
● Selectable forced-PWM mode and external synchronization
● Fully protected for short-circuit, over-temperature and temperature undervoltage
● Small 2.34mm x 1.72mm WLCSP
