DATA SHORT
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ISL91133
High Efficiency 2.3A Boost Regulator With Input-to-Output Bypass
The ISL91133 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 2.3A 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 ISL91133 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 ISL91133 is designed to support 6 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 ISL91133 requires only an inductor and a few external
components to operate. The 2.5MHz switching frequency
further reduces the size of external components.
The ISL91133 is available in a 16 bump, 0.4mm pitch,
1.78mmx1.78mm WLCSP.
FN8680
Rev 0.00
September 5, 2014
Features
• Input voltage range: 2.35V to 5.4V
• Output current: up to 2.3A (V
IN
= 2.5V, V
OUT
= 3.3V)
• Burst current up to 2.5A (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
• AN1958 “ISL91133 Evaluation Board User Guide”
V
IN
=
2.35V TO 5.4V
L
1
0.47µH
C
1
22µF
ISL91133IIMZ
LX
VOUT
V
OUT
= 3.3V TO V
IN
UP TO 2.3A
VIN
EN
RESET
PG
PGND
BYPS
AUTO BYPASS
FORCED BYPASS
V
OUT
HI
V
OUT
LO
EFFICIENCY (%)
C
2
2x22µF
R
1
VSEL
GND
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.001
4V
IN
3V
IN
2.7V
IN
2.5V
IN
0.01
0.1
I
OUT
(A)
1
FIGURE 1. TYPICAL APPLICATION
FIGURE 2. EFFICIENCY vs LOAD CURRENT, V
OUT
= 3.3V
FN8680 Rev 0.00
September 5, 2014
Page 1 of 2
ISL91133
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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
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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
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For information regarding Intersil Corporation and its products, see
www.intersil.com
FN8680 Rev 0.00
September 5, 2014
Page 2 of 2
