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PDF ISL91128 Data sheet ( Hoja de datos )
| Número de pieza | ISL91128 | |
| Descripción | High Efficiency Buck-Boost Regulator | |
| Fabricantes | Intersil | |
| Logotipo |  |
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DATA SHORT
To request the full datasheet, please visit www.intersil.com/products/isl91128
High Efficiency Buck-Boost Regulator with 4.5A Switches
and I2C Interface
ISL91128
The ISL91128 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
device also includes a selectable bypass mode for low power
consumption in applications that have a sleep or low power
mode.
The ISL91128 is capable of delivering at least 2.2A continuous
output current (VOUT = 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 ISL91128 supports a broader set of programmable features
that may be accessed via an I2C bus interface. With a
programmable output voltage range of 1.9V to 5.0V, the
ISL91128 is ideal for applications requiring dynamically
changing supply voltages. A programmable slew rate can be
selected to provide smooth transitions between output voltage
settings.
The ISL91128 is available in a 20 bump, 0.4mm pitch WLCSP
(2.15mmx1.74mm) and a 2.5MHz switching frequency, which
further reduces the size of external components.
Features
• Accepts input voltages above or below regulated output
voltage
• Automatic and seamless transitions between buck and boost
modes
• I2C Interface
• Input voltage range: 1.8V to 5.5V
• Continuous output current: up to 2.4A (PVIN = 2.5V,
VOUT = 3.3V)
• High efficiency: up to 96%
• 30µA quiescent current maximizes light-load efficiency
• Selectable bypass power saving mode operation
• 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 smart phones and tablet PCs
• Wireless communication devices
• 2G/3G/4G RF power amplifiers
Related Literature
• UG063, “ISL91128IIN-EVZ Evaluation Board User Guide”
IS L 9 1 1 2 8 IIN Z
VIN = 1.8V TO 5.5V
C1
PVIN
10µF
LX1
VIN
EN
SDA
LX2
VOUT
FB
SCL
L1µ1 H
VOUT = 3.3V
C2 x22 2 µ F
FIGURE 1. TYPICAL APPLICATION
100
VIN = 3.3V
95 VIN = 3.6V
VIN = 4.2V
90
85 VIN = 2.8V
VIN = 3V
80
75
1
10 100
LOAD CURRENT (mA)
1000
FIGURE 2. EFFICIENCY: VOUT = 3.3V, TA = +25°C
August 3, 2016
FN8732.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2016. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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| PDF Descargar | [ Datasheet ISL91128.PDF ] | |
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