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ISL91127IINZ-T7A

Description
IC REG BUCK BST 3.3V 2.1A WLCSP
Categorysemiconductor    Power management   
File Size1MB,13 Pages
ManufacturerIntersil ( Renesas )
Websitehttp://www.intersil.com/cda/home/
Environmental Compliance
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ISL91127IINZ-T7A Overview

IC REG BUCK BST 3.3V 2.1A WLCSP

ISL91127IINZ-T7A Parametric

Parameter NameAttribute value
FunctionBoost/Buck
Output configurationjust
Topologybuck boost
Output typefixed
Number of outputs1
Voltage - Input (minimum)1.8V
Voltage - input (maximum)5.5V
Voltage - Output (minimum/fixed)3.3V
Voltage - Output (maximum)-
Current - Output2.1A
Frequency - Switch2.5MHz
Synchronous rectifieryes
Operating temperature-
Installation typesurface mount
Package/casing20-XFBGA,WLCSP
Supplier device packaging20-WLCSP
DATASHEET
ISL91127
High Efficiency Buck-Boost Regulator with 4.5A Switches
The
ISL91127
is a high-current, buck-boost switching regulator
for systems using new battery chemistries. It uses the Renesas
proprietary buck-boost algorithm to maintain voltage
regulation while providing excellent efficiency and very low
output voltage ripple when the input voltage is close to the
output voltage.
The ISL91127 can deliver at least 2.1A continuous output
current (V
OUT
= 3.3V) across a battery voltage range of 2.5V to
4.35V. This maximizes the energy utilization of advanced,
single-cell Li-ion battery chemistries that have significant
capacity left at voltages below the system voltage. Its fully
synchronous low ON-resistance 4-switch architecture and a low
quiescent current of only 30µA optimize efficiency under all
load conditions.
The ISL91127 supports stand-alone applications with a fixed
3.3V or 3.5V output voltage or adjustable output voltage with
an external resistor divider. Output voltages as low as 1V or as
high as 5.2V are supported.
The ISL91127 is available in a 20 bump, 0.4mm pitch WLCSP
(2.15mmx1.74mm) with a 2.5MHz switching frequency, which
further reduces the size of external components.
FN8418
Rev 4.00
May 24, 2018
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
• Continuous output current: up to 2.1A (PVIN = 2.5V,
V
OUT
= 3.3V)
• High efficiency: up to 96%
• 30µA quiescent current maximizes light-load efficiency
• 2.5MHz switching frequency minimizes external component
size
• Fully protected for short-circuit, over-temperature, and
undervoltage
• Small 2.15mmx1.74mm WLCSP
Applications
• Brownout-free system voltage for smartphones and tablet
PCs
• Wireless communication devices
• 2G/3G/4G RF power amplifiers
Related Literature
For a full list of related documents, visit our website
ISL91127
product page
100
V
IN
= 3.6V
V
IN
= 4V
ISL91127IINZ
C
1
10µF
PVIN
L
1
1µH
LX2
VOUT
FB
V
OUT
= 3.3V
C
2
2x22µF
95
EFFICIENCY (%)
V
IN =
1.8V TO 5.5V
LX1
90
VIN
EN
MODE
85
V
IN
= 3.3V
V
IN
= 3V
V
IN
= 2.5V
80
SGND PGND
75
1
10
100
LOAD CURREN T (mA)
100 0
FIGURE 1. TYPICAL APPLICATION: V
OUT
= 3.3V
FIGURE 2. EFFICIENCY: V
OUT
= 3.3V
FN8418 Rev 4.00
May 24, 2018
Page 1 of 13

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