FN8659
Rev.2.00
May 23, 2017
ISL9120
Compact High Efficiency Low Power Buck-Boost Regulator
DATA SHORT
FN8659 Rev.2.00 Page 1 of 2
May 23, 2017
To request the full datasheet, visit www.intersil.com/products/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. 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 1.41m x1.41mm WLCSP
Applications
Smartphones and tablets
Portable consumer and wearable devices
Related Literature
For a full list of related documents, visit our website
-ISL9120 product page
FIGURE 1. TYPICAL FIXED OUTPUT APPLICATION FIGURE 2. EFFICIENCY: VOUT = 3.3V, TA = +25°C
VOUT = 3.3V
VOUT
FB C2
22F TO 47F
VIN
VIN =
1.8V TO 5.5V
C1
10F
ISL9120IINZ
GND PGND
LX1
LX2
L1
1H
EN
BYP
FORCED BYPASS
BUCK-BOOST
ENABLE
DISABLE
70
75
80
85
90
95
100
1 10 100 1000
EFFICIENCY (%)
OUTPUT CURRENT (mA)
VIN = 3.6V
VIN = 3V
VIN = 4V VIN = 3.4V
VIN = 2.5V
ISL9120
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
Intersil products are sold by description only. Intersil may modify the circuit design and/or specifications of products at any time without notice, provided that such
modification does not, in Intersil's sole judgment, affect the form, fit or function of the product. Accordingly, the reader is cautioned to verify that datasheets are
current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its
subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
For additional products, see www.intersil.com/en/products.html
FN8659 Rev.2.00 Page 2 of 2
May 23, 2017
© Copyright Intersil Americas LLC 2015-2017. All Rights Reserved.
All trademarks and registered trademarks are the property of their respective owners.