DATA SHORT
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ISL98607
High Efficiency Power Supply for Small Size Displays
The ISL98607 is a high efficiency power supply for small size
displays, like smart phones, requiring ±supply rails. It
integrates boost regulator, LDO, and inverting charge pump
that are used to generate two output rails: +5V (default) and
-5V (default). The ±5V output voltages can be adjusted up to
±5.7V with 50mV steps using the I
2
C interface.
The device integrates synchronous rectification MOSFETs for
the boost regulator and inverting charge pump, which
maximizes conversion efficiency.
ISL98607 integrates all compensation and feedback
components, which minimizes BOM count and reduces the
solution PCB size to 21mm
2
.
The input voltage range, high efficiency operation, and also
very low shutdown current make the device ideal for use in
single cell Li-ion battery operated applications.
The ISL98607 is offered in a 1.82x2.15mm
2
WLCSP package,
and the device is specified for operation over the
-40°C to +85°C ambient temperature range.
FN8421
Rev 0.00
March 8, 2013
Features
• Two outputs:
- VP = +5.0V (default)
- VN = -5.0V (default)
• 2.8V to 4.4V Input voltage range
• >85.5% Efficiency with 12mA load between VP and VN
• 21mm
2
Solution PCB area
• Fully integrated FETs for synchronous rectification
• Integrated compensation and feedback circuits
• I
2
C adjustable output voltages and settings
• Integrated VP/VN discharge resistors
• 1µA shutdown supply current
• 1.82x2.15mm, 4x5 array WLCSP with 0.4mm pitch
• Pb-Free (RoHS compliant)
Applications
• TFT-LCD Smart phone displays
• Small size/handheld displays
Typical Application
VIN
2.8V TO 4.4V
C
IN
10µF
0402
L1
2.2µH
LXP
VBSTCP
C
VBST
10µF
0402
C
VN
10µF
0402
VBST
C
CP
10µF
0402
CP
ISL98607
VIN
SCL
SDA
ENP
ENN
PROCESSOR
CN
-5.0V
LCD PANEL
VN
VSUB
VP
AGND
PGND
NEGATIVE SUPPLY
POSITIVE SUPPLY
+5.0V
C
VP
10µF
0402
FIGURE 1. TYPICAL APPLICATION CIRCUIT: TFT-LCD SMART PHONE DISPLAY
FN8421 Rev 0.00
March 8, 2013
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ISL98607
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FN8421 Rev 0.00
March 8, 2013
Page 2 of 2