Power Electronics
Single-Chip Display Power And LED Driver Suits Smartphones

Single-Chip Display Power And LED Driver Suits Smartphones

The ISL98611 display power and LED driver from Intersil Corp. suits smartphones. The ISL98611 is the first power management IC that integrates the display power and backlight LED driver functions in a single chip. It significantly improves efficiency of both functions to increase smartphone battery life by an hour or more.

Besides extending battery life, the ISL98611 also improves display brightness uniformity and color consistency. The highly integrated ISL98611 has a boost regulator, LDO and inverting charge pump for generating two output rails at +5 V and -5 V in a single device. It also includes a boost regulator with 3-channel current sinks for the LED backlight driver. This single-chip solution offers designers four key benefits:

·     Extended battery life: When used for web browsing and emails, a smartphone's backlight LEDs and display power consume the majority of its battery power. The ISL98611 backlight LED driver delivers seven percent higher efficiency (up to 93 percent) competitive multi-chip solutions and generates ±5 V display power supplies with greater than 88 percent efficiency at 15 mA load using a 2.5 x 2mm² size inductor, compared to 85 percent efficiency of the nearest competitor.

·     Improved display uniformity: The ISL98611 provides excellent LED current matching at very low LED current: it achieves ±2.2 percent matching down to 1 mA and ± 2.8 percent at 50 µA.

·     Improved display color consistency: The ISL98611 includes hybrid dimming to eliminate white LED color shift issues at low LED current, which occur with DC dimming.

·     Smallest footprint: The ISL98611's total display power plus backlight solution uses 24 percent less PCB area compared to the competition, while requiring only eight external components. This provides additional space to house the phone's battery.

The ISL98611 display power and LED driver is available now in a 2.33 x 2.61mm2, 30-ball WLCSP package. Pricing for the ISL98611 is $1.50 USD in 1k quantities. The ISL98611EVAL1Z evaluation board can be purchased for $100 USD each.

 

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