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ISL98608IIH

FN8724 Rev.2.01

Page 15 of 33

Dec 7, 2021

Application Information

Description

The ISL98608IIH is a display PMIC and can be used to supply

power to an LCD display. Figure 42 shows the typical system

application block diagram. For display power, the ISL98608IIH

integrates a boost regulator (VBST), low dropout linear regulator

(VP) and an inverting charge pump regulator (VN). The boost

voltage is generated from a battery voltage ranging from 2.5V to

5.5V and boost regulator output can be programmed from 4.60V

to 7.3V. The VBST regulator integrates low-side NFET and

high-side PFET MOSFETs for synchronous rectification.

The output voltage of VBST is the input to the linear regulator

(VP). The VBST output and VP regulator input are connected

internally in the IC. The VP regulator supplies a positive voltage in

the range of +4.5V to +7V with 50mV resolution. An 80Ω

discharge resistor discharges residual voltage when the power-

off sequence is initiated, which helps avoid ghost image issues.

The LDO is an ideal solution for the positive supply due to its low

ripple, fast load transient response, higher efficiency and low

dropout voltage.

The VN voltage is generated by a regulated inverting charge

pump topology. VBSTCP is the input to the inverting charge

pump, which should be connected to the VBST pin on the PCB.

The VN regulator supplies negative voltage from -7V to -4.5V with

50mV resolution. Similar to the VP regulator, the VN regulator

also integrates a discharge resistor and the value of discharge

resistor is 35Ω. The VN is an ideal solution for negative supply

due to low ripple, fast load transient response and higher

efficiency.

Modes of Operation

SHUTDOWN MODE

The ISL98608IIH is in shutdown mode when the enable pins,

namely ENN and ENP are pulled low. When the ENN and ENP

pins are all pulled low, all the regulators are powered off and the

IC is placed in shutdown mode where the current consumed from

the battery is only 1µA (typical).

OPERATING MODE

The IC is in normal operating mode when the ENN and ENP are

pulled high and the current consumed from the battery is only

1mA (excluding VBST and VN switching current). After the

ENN/ENP signals are pulled high, VBST, VP and VN go through

power-on sequencing. Refer to “Power-On/Off Sequence” on

page 23 for more details.

FIGURE 42. TYPICAL SYSTEM APPLICATION BLOCK DIAGRAM

APPLICATIONS

PROCESSOR

LCD PANEL/HI-Fi AUDIO AMPLIFIER

ISL98608IIH

VIN

2.5V to 5.5V

ENN

ENP

I2C

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