DATA SHORT
To request the full datasheet, please visit
www.intersil.com/products/isl91107
ISL91107
High Efficiency Buck-boost Regulator with 3.8A Switches
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.
FN8584
Rev 2.00
March 12, 2015
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”
V
IN
=
1.8V TO 5.5V
C
1
22µF
ISL91107IIAZ
PVIN
LX1
L
1
1µH
VIN
MODE
EN
FB
R
2
60.4k
GND
PGND
LX2
VOUT
R
1
187k
C
4
22pF
C
2
2x22µF
V
OUT
= 3.3V
EFFICIENCY (%)
100
V
IN
= 3.8V
95
90
85
80
75
70
V
IN
= 4.2V
V
IN
= 3.3V
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)
FN8584 Rev 2.00
March 12, 2015
Page 1 of 2
ISL91107
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in the quality certifications found at
www.intersil.com/en/support/qualandreliability.html
Intersil products are sold by description only. Intersil may modify the circuit design and/or specifications of products at any time without notice, provided that such
modification does not, in Intersil's sole judgment, affect the form, fit or function of the product. Accordingly, the reader is cautioned to verify that datasheets 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
FN8584 Rev 2.00
March 12, 2015
Page 2 of 2
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