DATASHEET
ISL9120
Compact High Efficiency Low Power Buck-Boost Regulator
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 (V
IN
= 2.5V, V
OUT
= 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.
FN8659
Rev.2.00
May 23, 2017
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 (V
IN
= 2.5V, V
OUT
= 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
100
V
IN
=
1.8V TO 5.5V
C
1
10F
ISL9120IINZ
VIN
LX1
V
IN
= 3.6V
95
EFFICIENCY (%)
L
1
1H
90
85
80
75
V
IN
= 4V
V
IN
= 3.4V
V
IN
= 2.5V
LX2
ENABLE
DISABLE
FORCED BYPASS
BUCK-BOOST
EN
VOUT
V
OUT
= 3.3V
C
2
22F TO 47F
V
IN
= 3V
BYP
FB
GND PGND
70
1
10
100
OUTPUT CURRENT (mA)
1000
FIGURE 1. TYPICAL FIXED OUTPUT APPLICATION
FIGURE 2. EFFICIENCY: V
OUT
= 3.3V, T
A
= +25°C
FN8659 Rev.2.00
May 23, 2017
Page 1 of 13
ISL9120
Block Diagram
LX1
A1
LX2
C1
VIN
A2
V
REF
+
REVERSE
CURRENT
GATE DRIVERS
AT ANTI-
SHOOT THRU
-
SOFT
DIS CHARGE
C2
VOUT
EN
EN
PVIN
MONITOR
THE RMAL
SHUTDOWN
B1 PGND
VOUT
CLAMP
PFM CONTROL
CURRENT
DETECT
EN B2
BYPS A3
VOLTAGE
COMPARATOR
-
EN
+
+
VREF
ILIM
VOLTAGE
PROG.
C3
FB
-
CURRENT
COMPARATOR
B3
GND
FIGURE 3. BLOCK DIAGRAM
Pin Configuration
ISL9120
9 BUMP WLCSP
BOTTOM VIEW
LX2
C
PGND
B
LX1
A
1
2
3
VIN
BYP
EN
GND
VOUT
FB
Pin Descriptions
PIN #
C1
C2
C3
B1
B2
B3
A1
A2
A3
PIN NAMES
LX2
VOUT
FB
PGND
EN
GND
LX1
VIN
BYP
DESCRIPTION
Inductor connection, output side.
Buck-boost output. Connect a 22µF or 47µF
capacitor to PGND.
Voltage feedback pin, connect directly to
VOUT pin for fixed output version.
Power ground for high switching current.
Logic input, drive HIGH to enable device. Do
not leave floating.
Analog ground pin.
Inductor connection, input side.
Power supply input. Range: 1.8V to 5.5V.
Connect a 10µF capacitor to PGND.
Forced bypass mode enable pin. Logic high
for forced bypass mode operation. Logic
low for buck-boost mode operation. Do not
leave floating.
FN8659 Rev.2.00
May 23, 2017
Page 2 of 13
ISL9120
Ordering Information
PART NUMBER
(Notes
1, 2, 3)
ISL9120IINZ-T
ISL9120IIAZ-T
ISL9120IINZ-T7A
ISL9120IIAZ-T7A
ISL9120IIN-EVZ
ISL9120IIA-EVZ
NOTES:
1. Refer to
TB347
for details on reel specifications.
2. These Intersil Pb-free WLCSP and BGA packaged products employ special Pb-free material sets, molding compounds/die attach materials, and
SnAgCu -e1 solder ball terminals, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free WLCSP
and BGA packaged products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J
STD-020.
3. For Moisture Sensitivity Level (MSL), see the product information page for
ISL9120.
For more information on MSL, see
TB363.
PART
MARKING
120N
120A
120N
120A
VOUT
(V)
3.3
ADJ.
ADJ.
ADJ.
TEMP RANGE
(°C)
-40 to +85
-40 to +85
-40 to +85
-40 to +85
TAPE AND REEL
QUANTITY
(UNITS)
3k
3k
250
250
PACKAGE
(RoHS Compliant)
9 Bump WLCSP
9 Bump WLCSP
9 Bump WLCSP
9 Bump WLCSP
PKG.
DWG. #
W3x3.9E
W3x3.9E
W3x3.9E
W3x3.9E
Evaluation Board for ISL9120IINZ
Evaluation Board for ISL9120IIAZ
FN8659 Rev.2.00
May 23, 2017
Page 3 of 13
ISL9120
Absolute Maximum Ratings
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
LX1, LX2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
FB (Adjustable Version) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 2.7V
FB (Fixed V
OUT
Version) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
GND, PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 0.3V
All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
ESD Rating
Human Body Model (Tested per JESD22-A114F) . . . . . . . . . . . . . . .2.5kV
Machine Model (Tested per JESD22-A115C) . . . . . . . . . . . . . . . . . 200V
Charged Device Model (Tested per JESD22-C101F). . . . . . . . . . . . . . 2kV
Latch-Up (Tested per JESD78D; Class 2) . . . . . . . . . . . . . . . . . . . . . . 100mA
Thermal Information
Thermal Resistance (Typical)
JA
(°C/W)
JB
(°C/W)
1.41x1.41 WLCSP (Notes
4, 5)
. . . . . . . . . .
95
27
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .+125°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see
TB493
Recommended Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Supply Voltage (V
IN
) Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8V to 5.5V
Load Current (I
OUT
) Range (DC) . . . . . . . . . . . . . . . . . . . . . . . . 0A to 800mA
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4.
JA
is measured in free air with the component mounted on a high-effective thermal conductivity test board with “direct attach” features. See
TB379
5. For
JB,
the "board temp" is taken on the board near the edge of the package, on a copper trace at the center of one side. See
TB379.
Analog Specifications
V
IN
= V
EN
= 3.6V, V
OUT
= 3.3V, L
1
= 1µH, C
1
= 10µF, C
2
= 47µF, T
A
= +25°C. Boldface limits apply across the
recommended operating temperature range, -40°C to +85°C and input voltage range (1.8V to 5.5V).
PARAMETER
POWER SUPPLY
Input Voltage Range
V
IN
Undervoltage Lockout Threshold
V
IN
V
UVLO
Rising
Falling
V
IN
Supply Current
V
IN
Supply Current, Shutdown
V
IN
Supply Current, Bypass Mode
OUTPUT VOLTAGE REGULATION
Output Voltage Range
Output Voltage Accuracy
FB Pin Voltage Regulation
FB Pin Bias Current
Line Regulation, 500mA
Load Regulation, 500mA
Line Regulation, 100mA
Load Regulation, 100mA
Output Voltage Clamp
Output Voltage Clamp Hysteresis
DC/DC SWITCHING SPECIFICATIONS
LX1 Pin Leakage Current
LX2 Pin Leakage Current
I
PFETLEAK
I
NFETLEAK
V
IN
= 3.6V
-0.05
-0.05
+0.05
+0.05
µA
µA
V
FB
I
FB
V
OUT
ISL9120IIAZ, I
OUT
= 100mA
V
IN
= 3.7V, I
OUT
= 1mA
For adjustable output version (ISL9120IIAZ)
For adjustable output version (ISL9120IIAZ)
0.00681
0.0072
0.00273
0.05
5.32
400
5.82
1.00
-3
0.80
0.025
5.20
+4
V
%
V
µA
mV/mV
mV/mA
mV/mV
mV/mA
V
mV
I
VIN
I
SD
I
BYP
V
OUT
= 3.7V (Note
7)
EN = GND
BYP = Logic high, V
IN
≤5V
1.550
1.8
1.725
1.650
41
0.005
0.8
55
1
3.5
5.5
1.790
V
V
V
µA
µA
µA
SYMBOL
TEST CONDITIONS
MIN
(Note
6)
TYP
MAX
(Note
6)
UNIT
V
OUT
/
V
IN
I
OUT
= 500mA, V
OUT
= 3.3V, V
IN
step from 2.3V to 5.5V
V
OUT
/
I
OUT
V
IN
= 3.7V, V
OUT
= 3.3V, I
OUT
step from 0mA to 500mA
V
OUT
/V
I
I
OUT
= 100mA, V
OUT
= 3.3V, V
IN
step from 2.3V to 5.5V
V
OUT
/
I
OUT
V
CLAMP
V
IN
= 3.7V, V
OUT
= 3.3V, I
OUT
step from 0mA to 100mA
Rising
FN8659 Rev.2.00
May 23, 2017
Page 4 of 13
ISL9120
V
IN
= V
EN
= 3.6V, V
OUT
= 3.3V, L
1
= 1µH, C
1
= 10µF, C
2
= 47µF, T
A
= +25°C. Boldface limits apply across the
recommended operating temperature range, -40°C to +85°C and input voltage range (1.8V to 5.5V). (Continued)
PARAMETER
SOFT-START AND SOFT DISCHARGE
Soft-Start Time
t
SS
Time from when EN signal asserts to when output voltage
ramp starts.
Time from when output voltage ramp starts to when output
voltage reaches 95% of its nominal value with device
operating in buck mode.
V
IN
= 4V, I
OUT
= 500mA
Time from when output voltage ramp starts to when output
voltage reaches 95% of its nominal value with device
operating in boost mode.
V
IN
= 3V, I
OUT
= 500mA
VOUT Soft-Discharge ON-Resistance
POWER MOSFET
P-Channel MOSFET ON-Resistance
N-Channel MOSFET ON-Resistance
INDUCTOR PEAK CURRENT LIMIT
Maximum Peak Current Limit
THERMAL PROTECTION
Thermal Shutdown
Thermal Shutdown Hysteresis
LOGIC INPUTS
Input Leakage
Input HIGH Voltage
Input LOW Voltage
NOTES:
6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
7. Quiescent current measurements are taken when the output is not switching.
I
LEAK
V
IH
V
IL
1.4
0.4
0.013
0.500
µA
V
V
150
35
°C
°C
I
LIM_MAX
2
A
r
DSON_P
r
DSON_N
I
OUT
= 200mA, measured with internal test mode
I
OUT
= 200mA, measured with internal test mode
50
50
mΩ
mΩ
r
DISCHG
EN < V
IL
1
1
ms
ms
SYMBOL
TEST CONDITIONS
MIN
(Note
6)
TYP
MAX
(Note
6)
UNIT
Analog Specifications
1
ms
110
Ω
FN8659 Rev.2.00
May 23, 2017
Page 5 of 13
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