DATA SHORT
To request the full datasheet, please visit
www.intersil.com/products/isl91132
ISL91132
High Efficiency 1.8A Boost Regulator with Input-to-Output Bypass
The
ISL91132
is an integrated boost switching regulator for
battery powered applications. The device provides a power
supply solution for products using a one cell Li-ion or Li-
polymer battery.
The device is capable of delivering up to 1.8A output current
from V
IN
= 2.5V and V
OUT
= 3.3V. The no-load quiescent
current is only 108μA in Boost mode and 45μA in Forced
Bypass mode, which significantly reduces the standby
consumption.
The ISL91132 offers a Bypass mode operation where the
output is directly connected to the input through a 38mΩ
MOSFET to allow a significantly lower dropout voltage. The
Bypass mode can be entered by an external command, or by
auto bypass. The Forced Bypass mode allows the output
voltage to operate close to the input voltage and improves the
efficiency under these conditions.
The ISL91132 is designed to support six fixed output voltages
ranging from 3.15V to 5V. A voltage select pin is available for
each output variant to scale up the output voltage by a small
offset to compensate the load transient droop.
The ISL91132 requires only an inductor and a few external
components to operate. The 2.5MHz switching frequency
further reduces the size of external components.
The ISL91132 is available in a 16 bump, 0.4mm pitch,
1.78mmx1.78mm WLCSP.
FN8637
Rev.1.00
Decem ber 8, 2016
Features
• Input voltage range: 2.35V to 5.4V
• Output current: up to 1.8A (V
IN
= 2.5V, V
OUT
= 3.3V)
• Burst current up to 2A (V
IN
= 2.5V, V
OUT
= 3.3V, t
ON
< 600µs,
T = 4.6ms)
• High efficiency: up to 96%
• 108µA quiescent current minimizes standby consumption in
Boost mode, 45µA in Forced Bypass mode
• 2.5MHz switching frequency minimizes external component
size
• Forced Bypass or Auto Bypass modes with a 38mΩ switch
• PFM mode at light-load currents
• Fully protected for overcurrent, over-temperature, and
undervoltage
• Load disconnect when disabled
• Small 1.78mmx1.78mm WLCSP
Applications
• Smartphones and tablet PCs
• Wireless communication devices
• 2G/3G/4G RF power amplifiers
• USB OTG power source
Related Literature
• AN1942, “ISL91132 Evaluation Board User Guide”
•
AN9208,
“High Frequency Power Converters”
100
V
IN
= 2.35V
TO 5.4V
L
1
0.47µH
C
1
22µF
VIN
EN
BYPS
AUTO BYPASS
FORCED BYPASS
V
OUT
HI
V
OUT
LO
ISL91132IIMZ
LX
VOUT
V
OUT
= 3.3V TO V
IN
UP TO 1.5A
98
96
EFFICIENCY (%)
94
92
90
88
86
84
0.001
0.010
0.100
LOAD CURRENT (A)
1.000
2.7 V
IN
4 V
IN
3 V
IN
C
2
22µF
R
1
RESET
PG
PGND
VSEL
GND
FIGURE 1. TYPICAL APPLICATION
FIGURE 2. EFFICIENCY vs LOAD CURRENT, V
OUT
= 3.3V
FN8637 Rev.1.00
Decem ber 8, 2016
Page 1 of 2
ISL91132
© Copyright Intersil Americas LLC 2014-2016. All Rights Reserved.
All trademarks and registered trademarks are the property of their respective owners.
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 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
FN8637 Rev.1.00
Decem ber 8, 2016
Page 2 of 2
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