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ISL91127IRNZ-T7A

Description
High Efficiency Buck-Boost Regulator with 4.5A Switches; QFN20, WLCSP20; Temp Range: -40° to 85°C
CategoryPower/power management    The power supply circuit   
File Size971KB,12 Pages
ManufacturerRenesas Electronics Corporation
Websitehttps://www.renesas.com/
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ISL91127IRNZ-T7A Overview

High Efficiency Buck-Boost Regulator with 4.5A Switches; QFN20, WLCSP20; Temp Range: -40° to 85°C

ISL91127IRNZ-T7A Parametric

Parameter NameAttribute value
Brand NameIntersil
MakerRenesas Electronics Corporation
Parts packaging codeQFN, WLCSP
Contacts20, 20
Reach Compliance Codecompli
Factory Lead Time7 weeks
Base Number Matches1
DATASHEET
ISL91127IR
High Efficiency Buck-Boost Regulator with 4.5A Switches
The
ISL91127IR
is a high-current buck-boost switching
regulator for systems using new battery chemistries. It uses
Intersil’s 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 ISL91127IR is capable of delivering at least 2A continuous
output current (V
OUT
= 3.3V) over 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 ISL91127IR 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 1.0V or
as high as 5.2V are supported.
The ISL91127IR is available in a 20 Ld, 0.5mm pitch QFN
(4mmx4mm) package. The 2.5MHz switching frequency
further reduces the size of external components.
FN8859
Rev 1.00
August 3, 2016
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 = 2.5V, 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
• 20 Ld 4mmx4mm QFN package
Applications
• Handheld and battery powered consumer and medical
devices
• Brownout free system voltage for smartphones and tablet
PCs
• Wireless communication devices
• 2G/3G/4G RF power amplifiers
Related Literature
UG080,
“ISL91127IRN-EVZ, ISL91127IR2A-EVZ,
ISL91127IRA-EVZ Evaluation Boards User Guide”
100
ISL91127IRNZ
V
IN =
1.8V TO 5.5V
C
1
10µF
EFFICIENCY (%)
PVIN
LX1
L
1
1µH
LX2
VOUT
FB
V
OUT
= 3.3V
C
2
2x22µF
95
90
85
VIN = 2.5V
80
75
70
1
10
100
1000
LOAD CURRENT (mA)
VIN = 3.3V
VIN = 3.6V
VIN = 4V
VIN
EN
MODE
SGND PGND
FIGURE 1. TYPICAL APPLICATION: V
OUT
= 3.3V
FIGURE 2. EFFICIENCY: V
OUT
= 3.3V, T
A
= +25°C
FN8859 Rev 1.00
August 3, 2016
Page 1 of 12
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