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”
V
IN
=
1.8V TO 5.5V
C
1
22µF
ISL91106IIAZ
PVIN
VIN
MODE1
MODE2
LX1
LX2
VOUT
FB
100
V
IN
= 3.8V
V
IN
= 3.3V
L
1
1µH
R
1
187k
R
2
60.4k
95
V
IN
= 4.2V
V
OUT
= 3.3V
EFFICIENCY (%)
C
4
22pF
90
85
80
75
70
Truth Table
MODE1 MODE2
0
0
1
1
0
1
0
1
MODE
Disable
Bypass
EN, PWM
EN, Auto
GND
PGND
C
2
2x22µF
V
IN
= 2.5V
1
10
100
LOAD CURRENT (mA)
1000
FIGURE 1. TYPICAL APPLICATION
FIGURE 2. EFFICIENCY vs OUTPUT CURRENT (V
OUT
= 3.3V)
September 22, 2014
FN8679.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
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Copyright Intersil Americas LLC 2014. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
ISL91106
For additional products, see
www.intersil.com/en/products.html
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at
www.intersil.com/en/support/qualandreliability.html
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time
without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be
accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see
www.intersil.com
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