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DATASHEET
To request the full datasheet, please visit www.intersil.com/products/isl91106
High Efficiency Buck-Boost Regulator with 3.6A
Switches and Bypass Mode
ISL91106
The ISL91106 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. The device also includes a
selectable bypass mode for low power consumption in
applications that have a sleep or low-power mode.
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 ISL91106 is designed for standalone applications. It
supports 3.3V and 3.4V 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 ISL91106 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
• Selectable bypass power saving 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
• AN1959, “ISL91106IIN-EVZ, ISL91106IIQ-EVZ and
ISL91106IIA-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
MODE1
MODE2
C
1
22µF
ISL91106IIAZ
GND PGND
LX1
LX2
L
1
1µH
C
4
22pF
1.8V TO 5.5V
Truth Table
MODE1 MODE2 MODE
00Disable
01Bypass
10EN, PWM
11EN, Auto
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
September 22, 2014
FN8679.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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