Datasheet
ISL9122A
Ultra-Low I
Q
Buck-Boost Regulator With Bypass
The
ISL9122A
is a highly integrated non-inverting
buck-boost switching regulator that accepts input
voltages both above or below the regulated output
voltage. It features an extremely low quiescent current
consumption of 1300nA in Regulation mode, 120nA in
Forced Bypass mode, and 8nA in Shutdown mode. It
provides 84% efficiency at 10µA load (V
IN
= 3.6V,
V
OUT
= 3.3V) and has a peak efficiency greater than
97%. It supports input voltages from 1.8V to 5.5V.
The ISL9122A has automatic bypass functionality for
situations in which the input voltage is close to the
output voltage, and it automatically transitions
between Buck and Boost modes without significant
output disturbance. In addition to the automatic
bypass functionality, the Forced Bypass power-saving
mode can be chosen if voltage regulation is not
required. Forced Bypass power saving mode is
accessible using the I
2
C interface bus.
The ISL9122A is capable of delivering up to 500mA of
output current (V
IN
= 3.6V, V
OUT
= 3.3V) and provides
excellent efficiency because of its adaptive frequency
hysteretic control architecture.
The ISL9122A is designed for stand-alone
applications and supports a default output voltage at
Power-On Reset (POR). After POR, the output
voltage can be adjusted in the range of 1.8V to
5.375V by using the I
2
C interface bus. Specific default
output voltages are available upon request.
The ISL9122A requires only a single EIA 0603 size
inductor and two external capacitors. Power supply
solution size is minimized by a 1.8mmx1.0mm
WLCSP and is also available in a 3.0mmx2.0mm
8 Ld plastic DFN.
L1
1µH/0603
95
Features
• 1300nA quiescent current
• 84% efficiency at 10µA load
• 97% peak efficiency
• Input voltage range: 1.8V to 5.5V
• Output voltage range: 1.8V to 5.375V
• Output current: up to 500mA (V
IN
= 3.6V,
V
OUT
= 3.3V)
• Selectable Forced and Auto Bypass power saving
modes
• Seamless PWM/PFM and buck/boost transition
• I
2
C Control and voltage adjustability
• Hysteretic controller
• Small 1.8mmx1.0mm WLCSP and 3.0mm x 2.0mm
8 Ld DFN packages
Applications
• Smart watches and wristband devices
• Wireless earphones
• Internet of Things (IoT) devices
• Water, gas, and oil meters
• Portable medical devices
• Hearing aid devices
Related Literature
For a full list of related documents, visit our website:
•
ISL9122A
product page
100
VIN
C
1
10µF/0603
VOUT
ISL9122A
SDA
SCL
GND
EN
C
2
10µF/0603
Efficiency (%)
V
IN
= 1.8V to 5.5V
LX1
LX2
V
OUT
= 1.8V to 5.375V
90
85
80
75
70
0.01
VIN = 1.8V
VIN = 2.5V
VIN = 3.6V
0.1
1
10
VIN = 4.5V
VIN = 5.0V
VIN = 5.5V
100
1000
I
2
C Host
Enable
Disable
Load Current (mA)
Figure 1. Typical Application
Figure 2. Efficiency: V
OUT
= 3.3V, T
A
= +25°C
FN8947 Rev.1.00
Sep.14.20
Page 1 of 20
ISL9122A
Contents
1.
1.1
1.2
1.3
1.4
2.
2.1
2.2
2.3
2.4
2.5
3.
4.
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
4.13
4.14
4.15
5.
6.
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
4
4
4
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Operation Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
2
C Interface Timing Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
5
5
5
8
Typical Performance Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Enable Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Soft Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overcurrent/Short-Circuit Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Buck-Boost Conversion Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PWM Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PFM Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation With V
IN
Close to V
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Forced Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
2
C Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Protocol Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Write Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Read Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Register Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
12
12
12
12
12
13
13
13
13
13
13
14
15
16
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Package Outline Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
FN8947 Rev.1.00
Sep.14.20
Page 2 of 20
ISL9122A
1. Overview
1.
1.1
Overview
Block Diagram
LX1
LX2
VIN
VOUT
`
GND
GND
Overcurrent
Hysteretic PWM
Controller
SDA
SCL
EN
Digital Core
Undervoltage
VREF
Over-Temperature
Figure 3. Block Diagram
FN8947 Rev.1.00
Sep.14.20
Page 3 of 20
ISL9122A
1. Overview
1.2
Ordering Information
Part Number
Temp
Part
Default
I
2
C
Marking V
OUT
(V) Address Range (°C)
122A
A22
A22
3.3V
3.3V
3.3V
0x18
0x18
0x18
-40 to +85
-40 to +85
-40 to +85
Tape and Reel
(Units) (Note
1)
3k
6k
250
Package
(RoHS Compliant)
8 Bump WLCSP
8 Ld DFN
8 Ld DFN
Pkg.
Dwg. #
W2x4.8
L8.2x3
L8.2x3
ISL9122AIINZ-T (Note
2)
ISL9122AIRNZ-T (Note
3)
ISL9122AIRNZ-T7A (Note
3)
ISL9122AIIN-EVZ
ISL9122AIRN-EVZ
Evaluation Board for ISL9122AIINZ
Evaluation Board for ISL9122AIRNZ
Notes:
1. See
TB347
for details about reel specifications.
2. These Pb-free WLCSP 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. Pb-free
WLCSP 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. These Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations).
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC
J-STD-020.
4. For Moisture Sensitivity Level (MSL), see the
ISL9122A
device page. For more information on MSL, see
TB363.
1.3
Pin Configurations
8 Bump WLCSP
Top View
1
2
8 Ld DFN
Top View
LX1
A
GND
LX2
1
2
3
4
8
7
6
5
VIN
SCL
SDA
EN
GND
LX2
9
EPAD
B
LX1
VOUT
VOUT
C
VIN
EN
D
SCL
SDA
1.4
Pin Descriptions
WLCSP Pin #
B2
A2
A1
B1
C1
C2
D2
D1
N/A
DFN Pin #
4
3
2
1
8
5
6
7
9
Pin Names
VOUT
LX2
GND
LX1
VIN
EN
SDA
SCL
EPAD
Buck-boost output.
Inductor connection, output side.
Ground connection.
Inductor connection, input side.
Power supply input.
Logic input, drive HIGH to enable device. Do not leave floating.
I
2
C data input. Pull up to VIN if not being used. Do not leave floating.
I
2
C clock input. Pull up to VIN if not being used. Do not leave floating.
Exposed Pad. Must be soldered to PCB GND.
Description
FN8947 Rev.1.00
Sep.14.20
Page 4 of 20
ISL9122A
2. Specifications
2.
2.1
Specifications
Absolute Maximum Ratings
Parameter
Minimum
-0.3
-0.3
-0.3
ESD Rating
Value
2
1
100
Maximum
6.5
6.5
6.5
Unit
V
V
V
Unit
kV
kV
mA
VIN, VOUT
LX1, LX2
All Other Pins
Human Body Model (Tested per JS-001-2014)
Charged Device Model (Tested per JS-002-2014)
Latch-Up (Tested per JESD78E; Class 2, Level A)
CAUTION:
Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions can adversely
impact product reliability and result in failures not covered by warranty.
2.2
Thermal Information
Thermal Resistance (Typical)
θ
JA
(°C/W)
110
72
θ
JC
(°C/W)
-
21
θ
JB
(°C/W)
28
-
8 Bump WLCSP Package (Notes
1, 2)
8 Ld 2x3 DFN Package (Notes
1, 3)
Notes:
1.
θ
JA
is measured in free air with the component mounted on a high-effective thermal conductivity test board with direct attach features.
See
TB379
2. For
θ
JB,
the board temperature is taken on the board near the edge of the package, on a copper trace at the center of one side.
3. For
θ
JC,
the case temperature location is the center of the exposed metal pad on the package underside. See
TB379.
Parameter
Maximum Junction Temperature
Storage Temperature Range
Pb-Free Reflow Profile
-65
Minimum
Maximum
+125
+150
see
TB493
Unit
°C
°C
2.3
Recommended Operation Conditions
Parameter
Minimum
-40
1.8
0
Maximum
+85
5.5
500
Unit
°C
V
mA
Ambient Temperature (T
A
) Range
Supply Voltage (V
IN
) Range
Load Current (I
OUT
) Range (DC)
2.4
Analog Specifications
V
IN
= V
EN
= 3.6V, V
OUT
= 3.3V, I
2
C pull-up voltage = V
IN
, L
1
= 1µH, C
1
= 10µF, effective C
2
= 6µF, 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),
unless specified otherwise.
Parameter
Power Supply
Input Voltage Range
V
IN
Undervoltage Lockout Threshold
Hysteresis
V
IN
Quiescent Current
I
Q
V
IN
= 3.6V, I
OUT
= 0A (Note
5)
V
IN
V
UVLO
V
IN
Rising
40
1300
1800
1.8
5.5
1.79
V
V
mV
nA
Symbol
Test Conditions
Min
(Note
4)
Typ
Max
(Note
4)
Unit
FN8947 Rev.1.00
Sep.14.20
Page 5 of 20
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