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The ISL98611A is a high efficiency display power supply and LED driver for small size displays such as smart phones. It integrates a boost regulator, LDO and inverting charge pump that are used to generate two output rails for the display power: +5V (default) and -5V (default). It also integrates a boost regulator and 3-channel current sinks for the LED backlight driver. The ±5V output voltages can be adjusted from ±4.5V up to ±6V.

ISL98611A extends the battery life of mobile devices by delivering greater than 87% efficiency for the display power function. For a backlight driver ISL98611A uses nonsynchronous rectification and by using a 3-channel topology ISL98611A provides more than 90% efficiency. ISL98611A integrates all compensation and feedback components, which minimizes BOM count and reduces the solution PCB size.

This product drives backlight LEDs with excellent current matching even at very low LED current (±2.2% down to 1mA), improving the brightness uniformity of LCD displays. It includes analog, PWM and hybrid dimming to maximize LED efficiency while eliminating color shift issues.

The ISL98611A is offered in a 2.33x2.61mm² WLCSP package, and the device is specified for operation across the -40°C to +85°C ambient temperature range.

Key Features

• >87% efficiency with 12mA load between VP and VN
• More than 90% efficient LED driver
• Only 9 external components; integrated compensation and feedback circuits
• Analog, PWM and hybrid dimming
• ±2.2% current matching down to 1mA
• Can drive 2 or 3 strings of LEDs
• 35V maximum VLED voltage
• 10-bit linear and 11-bit logarithmic DC output current control
• I2C, PWM and SWIRE dimming inputs with internal multiplier for CABC
• 2.5V to 5V input voltage range
• VP and VN output adjustable from ±4.5V up to ±6V with 50mV steps
• I2C adjustable output voltages and settings
• 1µA shutdown supply current
• Pb-free (RoHS compliant)

Applications

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