isl98611a

DATASHEET
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High Efficiency Display Power and LED Driver for Smart
Phones
ISL98611A
Features
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.
• >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
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.
• 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
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.
• I2C adjustable output voltages and settings
• 1µA shutdown supply current
• Pb-free (RoHS compliant)
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.
Applications
• TFT-LCD smart phone displays
• Small size/handheld display
3P6S 30mA/string
VIN
2.5V TO 5V
L2
10µH
CIN
10µF
0402
L1
2.2µH
VIN
CVLED
4.7µF
0603
LXLED VLED
CH0
CH1
CH2
LXBST
ISL98611A VBSTCP
VBST
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
July 29, 2015
FN8742.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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ISL98611A
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in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
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without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be
accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
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FN8742.1
July 29, 2015