ISL986110 pages

DATASHEET
To request the full datasheet, please visit www.intersil.com/products/isl98611

High Efficiency Display Power and LED Driver for Smart
Phones
ISL98611

Features

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.

• Display power output voltage: ±5V, ±5.6V

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.

• Analog, PWM and hybrid dimming

• 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
• ±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

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.

• 2.5V to 5V input voltage range
• VP and VN output adjustable from ±4.5V up to ±6V with
50mV steps

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.

• I2C adjustable output voltages and settings
• 1µA shutdown supply current

Applications

• RoHS compliant
TABLE 1. KEY DIFFERENCES BETWEEN PARTS

• TFT-LCD Smart phone displays

PART NUMBER

• Small size/handheld display

VP/VN OPTIONS (V)

ISL98611IIZ-T

±5

ISL98611II56Z-T

±5.6

3P6S 30mA/string

VIN
2.5V TO 5V
CIN
10µF
0402

L2
10µH
L1
2.2µH

VIN

CVLED
4.7µF
0603
LXLED VLED
CH0
CH1
CH2

LXBST

VBSTCP
VBST

ISL98611
CP

CCP
10µF
0402

CVBST
10µF
0402

FAULT

PROCESSOR

SWIRE
PWMI
SCL
SDA
ENP
ENN
ENLED

CN

CVN
10µF
0402

VN
VSUB
AGND

PGND

VP

-5.0V

NEGATIVE SUPPLY

LCD PANEL

POSITIVE SUPPLY
CVP
10µF
0402

+5.0V

FIGURE 1. TYPICAL APPLICATION CIRCUIT FOR 3-CHANNEL LED DRIVER

April 3, 2015
FN8662.2

1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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