High Efficiency Power Supply for Small Size Displays

The ISL98608 is a high efficiency power supply for small size displays, such as smart phones and tablets requiring ±supply rails. It integrates a boost regulator, LDO and inverting charge pump that are used to generate two output rails: +5.5V (default) and -5.5V (default). The ±5.5V output voltages can be adjusted from ±4.5V up to ±7V with 50mV steps using the I2C interface.

FEATUREs
• Two outputs:
   - VP = +5.5V (default)
   - VN = -5.5V (default)
• 2.5V to 5V input voltage range
• ±4.5 to ±7V wide output range
• >89% efficiency with 12mA load between VP and VN
• 18mm2 solution PCB area
• Fully integrated FETs for synchronous rectification
• Integrated compensation and feedback circuits
• I2C adjustable output voltages and settings
• Integrated VP/VN discharge resistors
• 1µA shutdown supply current
• Programmable turn-on and turn-off sequencing
• 1.744mm x1.744mm, 4x4 array WLCSP with 0.4mm pitch

APPLICATIONs
• TFT-LCD smart phone displays
• Small size/handheld displays