1
DATASHEET
To request the full datasheet, please visit www.intersil.com/products/isl91134
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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| Copyright Intersil Americas LLC. 2014. All Rights Reserved
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High Efficiency 1.8A Boost Regulator With
Input-to-Output Bypass
ISL91134
The ISL91134 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
= 3V and V
OUT
= 5V. The no load quiescent current is
only 108µA in Boost Mode and 45µA in Forced Bypass Mode,
which significantly reduces the standby consumption.
The ISL91134 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 ISL91134 is designed to support a fixed output voltage of
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 ISL91134 requires only an inductor and a few external
components to operate. The 2.5MHz switching frequency
further reduces the size of external components.
The ISL91134 is available in a 16 bump, 0.4mm pitch,
1.78mmx1.78mm WLCSP.
Features
• Input voltage range: 2.35V to 5.4V
•Output current: up to 1.8A (V
IN
= 3V, V
OUT
= 5V)
• 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
• AN1957, “ISL91134 Evaluation Board User Guide”
FIGURE 1. TYPICAL APPLICATION FIGURE 2. EFFICIENCY vs LOAD CURRENT, V
OUT
= 5V
V
IN
=
2.35V TO 5.4V
V
OUT
= 5V
UP TO 1.8A
ISL91134IIQ
VIN
EN
LX VOUT
C
2
22µF
GNDPGND
C
1
22µF
PG
RESET
R
1
BYPS
AUTO BYPASS
FORCED BYPASS
L
1
0.47µH
VSEL
V
OUT
HI
V
OUT
LO
80
82
84
86
88
90
92
94
96
98
100
0.001 0.01 0.1 1
EFFICIENCY (%)
I
OUT
(A)
3.6V
IN
5.4V
IN
2.7V
IN
3V
IN
4.2V
IN
3.3V
IN
V
OUT
= 5V
October 3, 2014
FN8678.1
