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The ISL98611 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 regulated positive and negative voltages for display power. It also integrates a boost regulator and 3-channel current sinks for the LED backlight driver. The positive and negative output voltages can be adjusted from ±4.5V up to ±6V.

The ISL98611 extends the battery life of mobile devices by delivering greater than 88% efficiency for the display power function and up to 93% efficiency for the backlight driver when powering 12 LEDs. It reduces PCB area by integrating the two functions into a single IC and by requiring only 8 external components in total.

This product drives backlight LEDs with excellent current matching even at very low LED current (±2.2% down to 1mA and ±2.8% at 50μA), improving the brightness uniformity of LCD displays. It includes analog, PWM and hybrid dimming to maximize LED efficiency while eliminating color shift issues.

The ISL98611 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

• Display power output voltage: ±5V, ±5.6V
• Positive and negative voltages can be programmed from ±4.5V to ±6V
• >88% efficiency with 12mA load between VP and VN
• Up to 93% efficient LED driver
• Only 8 external components; integrated compensation and feedback circuits
• Analog, PWM and hybrid dimming
• ±2.2% current matching down to 1mA and ±2.8% at 50μA
• Can drive 2 strings of LEDs
• 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
• RoHS compliant

Applications

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