ISL98611A Datasheet, PDF (1/2 Pages) Intersil Corporation – High Efficiency Display Power and LED Driver for Smart Phones

DATASHEET
To request the full datasheet, please visit www.intersil.com/products/isl98611a
High Efficiency Display Power and LED Driver for Smart
Phones
ISL98611A
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.
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
VIN
2.5V TO 5V
CIN
10µF
0402
L1
2.2µH
PROCESSOR
L2
10µH
CVLED
4.7µF
0603
VIN
LXLED VLED
LXBST
CH0
CH1
CH2
ISL98611A
VBSTCP
VBST
FAULT
SWIRE
PWMI
SCL
SDA
ENP
ENN
ENLED
AGND
CP
CN
VN
VSUB
PGND
VP
3P6S 30mA/string
CCP
10µF
0402
CVBST
10µF
0402
CVN
10µF
0402
-5.0V
NEGATIVE SUPPLY
POSITIVE SUPPLY
CVP
10µF
0402
+5.0V
LCD PANEL
FIGURE 1. TYPICAL APPLICATION CIRCUIT FOR 3-CHANNEL LED DRIVER
July 29, 2015
1
FN8742.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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