1
DATASHEET
To request the full datasheet, please visit www.intersil.com/products/isl91107
High Efficiency Buck-boost Regulator with 3.8A
Switches
ISL91107
The ISL91107 is a highly-integrated buck-boost switching
regulator that accepts input voltages either above or below the
regulated output voltage. Unlike other buck-boost regulators,
this regulator automatically transitions between operating
modes without significant output disturbance.
This device is capable of delivering up to 2A of output current
(PVIN = 2.8V, V
OUT
= 3.3V) and provides excellent efficiency
due to its fully synchronous 4-switch architecture. No-load
quiescent current of only 45µA also optimizes efficiency under
light-load conditions.
The ISL91107 is designed for standalone applications and
supports 3.3V 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.
The ISL91107 requires only a single inductor and very few
external components. Power supply solution size is minimized
by a 2.15mmx1.51mm WLCSP and a 2.5MHz switching
frequency, which further reduces the size of external
components.
Features
• Accepts input voltages above or below regulated output
voltage
• Automatic and seamless transitions between buck and
boost modes
• Input voltage range: 1.8V to 5.5V
• Output current: up to 2A (PVIN = 2.8V, V
OUT
= 3.3V)
• High efficiency: up to 96%
• 45µA quiescent current maximizes light load efficiency
• 2.5MHz switching frequency minimizes external component
size
• Selectable forced PWM mode
• Fully protected for short-circuit, over-temperature and
undervoltage
• Small 2.15mmx1.51mm WLCSP
Applications
• Smartphones and tablet PCs
• Wireless communication devices
• 2G/3G/4G power amplifiers
Related Literature
• AN1940, “ISL91107IIN-EVZ, ISL91107IIA-EVZ Evaluation
Board User Guide”
FIGURE 1. TYPICAL APPLICATION FIGURE 2. EFFICIENCY vs OUTPUT CURRENT (V
OUT
=3.3V)
V
OUT
= 3.3V
VOUT
FB
C
2
2x22µF
R
1
R
2
187k
60.4k
PVIN
V
IN
=
VIN
MODE
EN
C
1
22µF
ISL91107IIAZ
GND PGND
LX1
LX2
L
1
1µH
C
4
22pF
1.8V TO 5.5V
70
75
80
85
90
95
100
1 10 100 1000
V
IN
= 3.8V
V
IN
= 3.3V
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 2.5V
V
IN
= 4.2V
March 12, 2015
FN8584.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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