DATASHEET
ISL9110, ISL9112
1.2A High Efficiency Buck-Boost Regulators
FN7649
Rev.3.00
Jul 26, 2018
The ISL9110 and ISL9112 are highly-integrated buck-boost
switching regulators that accept input voltages either above or
below the regulated output voltage. Unlike other Buck-Boost
regulators, these regulators automatically transition between
operating modes without significant output disturbance.
Features
• Accepts input voltages above or below regulated output
voltage
• Automatic and seamless transitions between Buck and
Boost modes
Both parts are capable of delivering up to 1.2A output current,
and provide excellent efficiency due to their fully synchronous
4-switch architecture. No-load quiescent current of only 35µA
also optimizes efficiency under light-load conditions. Forced
PWM and/or synchronization to an external clock may also be
selected for noise sensitive applications.
• Input voltage range: 1.8V to 5.5V
• Output current: Up to 1.2A
• High efficiency: Up to 95%
• 35µA quiescent current maximizes light-load efficiency
• 2.5MHz switching frequency minimizes external component
size
The ISL9110 is designed for standalone applications and
supports 3.3V and 5V fixed output voltages or variable output
voltages with an external resistor divider. Output voltages as
low as 1V, or as high as 5.2V are supported using an external
resistor divider.
• Selectable Forced PWM mode and external synchronization
2
• I C Interface (ISL9112)
• Fully protected for overcurrent, over-temperature, and
undervoltage
The ISL9112 supports a broader set of programmable features
that may be accessed using an I C bus interface. With a
2
• Small 3mmx3mm TDFN Package
programmable output voltage range of 1.9V to 5V, the
ISL9112 is ideal for applications requiring dynamically
changing supply voltages. A programmable slew rate can be
selected to provide smooth transitions between output voltage
settings.
Applications
• Regulated 3.3V from a single Li-ion battery
• Smart phones and tablet computers
• Handheld devices
The ISL9110 and ISL9112 require only a single inductor and
very few external components. Power supply solution size is
minimized by a tiny 3mmx3mm package and a 2.5MHz
switching frequency, which further reduces the size of external
components.
• Point-of-load regulators
Related Literature
For a full list of related documents, visit our website
• ISL9110, ISL9112 product pages
V
=
100
95
IN
ISL9110IRTNZ
1.8V TO 5.5V
5
PVIN
LX1
C
10µF
1
L1
2.2µH
90
6
10
9
V
= 5V
V
VIN
LX2
IN
1
V
=
OUT
85
80
75
70
MODE
EN
VOUT
3.3V/1A
8
V
= 3V
C
BAT
PG
12
2
IN
= 2.5V
STATUS
OUTPUTS
IN
FB
7
10µF
V
= 3.3V
GND PGND
11
OUT
0.01
0.05
0.25
1.25
3
I
(A)
OUT
FIGURE 2. EFFICIENCY
FIGURE 1. TYPICAL APPLICATION
FN7649 Rev.3.00
Jul 26, 2018
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