DATASHEET
ISL98608IIH
FN8724
Rev.2.00
High Efficiency Single Inductor Positive/Negative Power Supply
Sep 26, 2017
The ISL98608IIH is a high efficiency power supply for small
Features
size displays, such as smart phones and tablets requiring
Two outputs:
supply rails. It integrates a boost regulator, LDO, and inverting
charge pump that are used to generate two output rails: - VP = +5V (default)
+5V (default) and -6 (default). The 5V output voltages can be
- VN = -5V (default)
2
adjusted from 4.5V up to 7V with 50mV steps using the I C
2.5V to 5.5V input voltage range
interface.
4.5 to 7V wide output range
The device integrates synchronous rectification MOSFETs for
Supports 200mA current between VP and VN
the boost regulator and inverting charge pump, which
maximizes conversion efficiency.
>89% efficiency with 12mA load between VP and VN
2
The ISL98608IIH integrates all compensation and feedback
18mm solution PCB area
components, which minimizes BOM count and reduces the
Fully integrated FETs for synchronous rectification
2
solution PCB size to 18mm .
Integrated compensation and feedback circuits
The input voltage range, high efficiency operation and very low
2
I C adjustable output voltages and settings
shutdown current make the device ideal for use in single cell
Li-ion battery operated applications. Integrated VP/VN discharge resistors
1A shutdown supply current
The ISL98608IIH is offered in a 1.744mm x1.744mm WLCSP
package, and the device is specified for operation across the
Programmable turn-on and turn-off sequencing
-40C to +85C ambient temperature range.
1.744mm x1.744mm, 4x4 array WLCSP with 0.4mm pitch
Applications
TFT-LCD smart phone displays
Small size/handheld displays
Hi-Fi audio amplifier supply
Typical Application Circuits
VIN
2.5V TO 5.5V
L
1
VIN
C
IN
LXP
SCL
VBSTCP
SDA
VBST
PROCESSOR
ENP
C
VBST
ENN
CP
C
CP ISL98608IIH
CN
C
VN
-5V
VN
NEGATIVE SUPPLY
VSUB
LCD PANEL
POSITIVE SUPPLY
VP
+5V AGND PGND
C
VP
FIGURE 1. TYPICAL APPLICATION CIRCUIT: TFT-LCD SMART PHONE DISPLAY
FN8724 Rev.2.00 Page 1 of 33
Sep 26, 2017ISL98608IIH
Typical Application Circuits (Continued)
VIN
2.5V TO 5.5V
L
1
VIN
C
IN
LXP
SCL
VBSTCP
SDA
VBST
PROCESSOR
ENP
C
VBST
ENN
CP
ISL98608IIH
C
CP
CN
C
VN
NEGATIVE SUPPLY
VN
VSUB
AMPLIFIER
VP
AGND PGND
POSITIVE SUPPLY
C
VP
FIGURE 2. TYPICAL APPLICATION CIRCUIT: HI-FI AUDIO AMPLIFIER POWER SUPPLY
Block Diagram
VIN
LXP
VIN
VBSTCP
CP
VBST
VBST
OSCILLATOR
PWM/
PFM
VN
LOGIC
CN
LOGIC
PGND
PGND
CURRENT LIMIT
VN
UVP
-60%
UVP
+60%
COMP
VREF
VSUB
GM
COMP
VREF
GM
SCL
2
DAC
I C CONTROL
SDA
DAC
ENP
EN/ SEQUENCING VP
LDO
ENN
SETTINGS
DAC
FIGURE 3. BLOCK DIAGRAM
FN8724 Rev.2.00 Page 2 of 33
Sep 26, 2017