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.

The device integrates synchronous rectification MOSFETs for

the boost regulator and inverting charge pump, which

maximizes conversion efficiency.

ISL98608 integrates all compensation and feedback

components, which minimizes BOM count and reduces the

solution PCB size to 18mm2.

The input voltage range, high efficiency operation and also

very low shutdown current make the device ideal for use in

single cell Li-ion battery operated applications.

The ISL98608 is offered in a 1.744mm x1.744mm WLCSP

package, and the device is specified for operation across the

-40°C to +85°C ambient temperature range.

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