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DATASHEET
To request the full datasheet, please visit www.intersil.com/products/isl9120
Compact High Efficiency Low Power Buck-Boost
Regulator
ISL9120
The ISL9120 is a highly integrated buck-boost switching
regulator that accepts input voltages either above or below the
regulated output voltage. This regulator automatically transitions
between buck and boost modes without significant output
disturbance. The ISL9120 also has automatic bypass
functionality for when the input voltage is generally within 1% to
2% of the output voltage, there will be a direct bypass connection
between the VIN and VOUT pins. In addition to the automatic
bypass functionality, the ISL9120 also has forced bypass
functionality with the use of the BYP pin.
This device is capable of delivering up to 800mA of output
current (VIN = 2.5V, VOUT = 3.3V) and provides excellent
efficiency due to its adaptive current limit pulse frequency
modulation (PFM) control architecture.
The ISL9120 is designed for stand-alone applications and
supports a 3.3V fixed output voltage or variable output voltages
with an external resistor divider. The forced bypass power saving
mode can be chosen if voltage regulation is not required. The
device consumes less than 3.5µA of current over the operating
temperature range in forced bypass mode.
The ISL9120 requires only a single inductor and very few external
components. Power supply solution size is minimized by a
1.41mmx1.41mm WLCSP.
Features
• Accepts input voltages above or below regulated output
voltage
• Automatic bypass mode functionality
• Automatic and seamless transitions between buck and boost
modes
• Input voltage range: 1.8V to 5.5V
• Selectable forced bypass power saving mode
• Adaptive multilevel current limit scheme to optimize efficiency
at low and high currents
• Output current: up to 800mA (VIN = 2.5V, VOUT = 3.3V)
• High efficiency: up to 98%
• 41µA quiescent current maximizes light-load efficiency
• Fully protected for over-temperature and undervoltage
• Small 1.41mmx1.41mm WLCSP
Applications
• Smartphones and tablets
• Portable consumer and wearable devices
Related Literature
UG023, “ISL9120IIx-EVZ Evaluation Board User Guide”
VIN =
1.8V TO 5.5V
C1
10F
ENABLE
DISABLE
FORCED BYPASS
BUCK-BOOST
ISL9120IINZ
VIN LX1
EN
BYP
LX2
VOUT
FB
GND PGND
L1
1H
VOUT = 3.3V
C2
22F TO 47F
FIGURE 1. TYPICAL FIXED OUTPUT APPLICATION
100
VIN = 3.6V
95
90
85 VIN = 3V
80
VIN = 4V
VIN = 3.4V
VIN = 2.5V
75
70
1
10 100
OUTPUT CURRENT (mA)
FIGURE 2. EFFICIENCY: VOUT = 3.3V, TA = +25°C
1000
January 29, 2016
FN8659.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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ISL9120
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January 29, 2016