ISL91107IR Datasheet, PDF (1/13 Pages) Intersil Corporation – High Efficiency Buck-Boost Regulator with 4.1A Switches

DATASHEET
High Efficiency Buck-Boost Regulator with 4.1A
Switches
ISL91107IR
The ISL91107IR is a highly-integrated buck-boost switching
regulator that accepts input voltages either above or below the
regulated output voltage. Unlike other buck-boost regulators,
this regulator automatically transitions between operating
modes without significant output disturbance.
This device is capable of delivering up to 2A of output current
(PVIN = 2.8V, V_OUT = 3.3V) and provides excellent efficiency
due to its fully synchronous 4-switch architecture. No-load
quiescent current of only 45µA also optimizes efficiency under
light load conditions.
The ISL91107IR is designed for standalone applications and
supports 3.3V fixed output voltages or variable output voltages
with an external resistor divider. Output voltages as low as 1V
or as high as 5.2V are supported using an external resistor
divider.
The ISL91107IR requires only a single inductor and very few
external components. Power supply solution size is minimized
by its 2.5MHz switching frequency, allowing small size external
components.
The ISL91107IR is available in a 3x4 20 Ld TQFN package.
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 = 2.8V, V_OUT = 3.3V)
• High efficiency: up to 96%
• 45µA quiescent current maximizes light load efficiency
• 2.5MHz switching frequency minimizes external component
size
• Selectable forced PWM mode
• Fully protected for short-circuit, over-temperature and
undervoltage
• Small 3mmx4mm TQFN package
Applications
• Smartphones and tablet PCs
• Wireless communication devices
• Optical modules networking equipment
V_IN =
1.8V TO 5.5V
C₁
22µF
ISL91107IRTNZ
PVIN
LX1
VIN
MODE
EN
LX2
VOUT
FB
SGND PGND
L₁
1µH
V_OUT = 3.3V
C₂
2x22µF
FIGURE 1. TYPICAL ISL91107IRTNZ APPLICATION
100
95 _{VIN = 3.6V}
90
85
80
V_IN = 4.2V
75
V_IN = 2.7V
V_IN = 3V
70
65
V_IN = 2.5V
600.001
0.01
0.1
LOAD CURRENT (A)
1.0
3.0
FIGURE 2. EFFICIENCY vs OUTPUT CURRENT (V_OUT = 3.3V)
March 2, 2015
1
FN8687.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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