Rev. 1.0 August 2015 www.aosmd.com Page 1 of 11
AOZ2023
3A Ultra Low Dropout Linear Regulator
General Description
The AOZ2023 is a 3A ultra low dropout linear regulator
designed for desktop motherboard, graphic card and
notebook applications. This device needs dual supplies,
a control voltage for the control circuitry and an input
voltage for power conversion. The AOZ2023 delivers
high-current and ultra low-drop output voltage for
applications where VOUT is very close to VIN.
The AOZ2023 features comprehensive control and
protection functions: a power on reset (POR) circuit for
monitoring both control and power inputs for proper
operation; an EN input for enabling or disabling the
device, a power OK with time delay for indicating the
output voltage status, a current limit function, and a
thermal shutdown function.
The AOZ2023 is available in exposed pad SO-8
package.
Features
Ultra low dropout linear regulator
1.3V~5.5V VIN supply voltage with external control
voltage
Dropout voltage (typical):
− 180mV @ 2A
High accuracy output voltage +1.5%
Enable and Power Good
VOUT pull low resistance when disabled
Current limiting protection
Thermal shutdown protection
Output voltage adjustable
Small footprint exposed pad SO-8 Package
Applications
Desktop, notebook PCs
Workstations
Graphic cards
Low voltage logic supplies
Gaming
SMPS post regulators
Typical Application
EN
VIN
FB
VOUT
GND
GND
POK
AOZ2023
C3
10µF C5
22µF
VIN
CNTL
C6
10µF/NI
R3
C4
1µF
C2
1µF
R1
R2
C1
VOUT
AOZ2023
Rev. 1.0 August 2015 www.aosmd.com Page 2 of 11
Ordering Information
AOS Green Products use reduced levels of Halogens, and are also RoHS compliant.
Please visit www.aosmd.com/media/AOSGreenPolicy.pdf for additional information.
Pin Configuration
Pin Description
Part Number Ambient Temperature Rang e Package Environmental
AOZ2023PI -40 °C to +85 °C EPAD SO-8 Green Product
Pin Number Pin Name Pin Function
1 POK Power OK Indication. This pin is an open-drain output and is set high impedance once
VOUT reaches 90% of its rating voltage.
2 EN Enable Input. Pulling this pin below 0.8V turns the regulator off, reducing the quiescent
current to a fraction of its operating value.
3 VIN Input Voltage. This is the drain input to the power device that supply current to the output
pin. Large bulk capacitors with low ESR should be placed physically close to this pin o
prevent the input rail from dropping during large load transient. A 10μF ceramic capacitor is
recommended at this pin.
4 VCNTL Supply Input for Control Circuit. This pin provides bias voltage to the control circuitry and
driver for the pass transistor. The driving capability of output current is proportioned to the
VCNTL. For the device to regulate, the voltage on this pin must be at least 1.5V greater
than the output voltage, and no less than VCNTL_min.
5 NC Not Internally Connected.
6 VOUT Output Voltage. This pin is power output of the device. A pull low resistance exists when the
device is disabled by pulling low the EN pin.
7 FB Feedback Voltage. This pin is the inverting input to the error amplifier. A resistor divider
from the output to GND is used to set the regulation voltage as VOUT=0.8x(R1+R2)/R2 (V).
8 GND Ground.
Exposed PAD GND Ground. The exposed pad acts the dominant power dissipation path and should be
soldered to well design PCB pads.
POK 1GND
8
EN 2FB
7
VIN 3VOUT
6
VCNTL 4NC
5
Exposed
PAD
GND
EPAD SO-8
(Top View)
AOZ2023
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Block Diagram
Absolute Maximum Ratings
Exceeding the Absolute Maximum Ratings may damage the
device.
Note:
1. Devices are inherently ESD sensitive, handling precautions are
required. Human body model rating: 1.5kΩ in series with 100pF.
Recommended Operating Conditions
The device is not guaranteed to operate beyon d the
Recommended Operating Conditions.
Parameter Rating
VIN 1V to 6V
VCNTL 3V to 6V
VOUT 0.8V to 6V
Other Pins -0.3V to 6V
ESD Rating(1) 2kV
Parameter Rating
Supply Voltage (VIN) 1.3V to 5.5V
Supply Control Voltage (VCNTL) 3V to 5.5V
Junction Temperature (TJ) -40°C to +125°C
Ambient Temperature (TA) -40°C to +85°C
Power Dissipation (PD)2W
Package Thermal Resistance
EPAD SO-8 (ΘJA)50°C/W
Softstart &
Control Logic
FB
0.8V Vref
VOUT
POK
EN VCNTL VIN
OTP POR
GND
90% Vref
0.2V
Delay
OCP
AOZ2023
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Electrical Characteristics
TA = 25 °C, VIN = 1.4V, VCNTL = VEN = 5V, CIN = COUT = 10μF, unless otherwise specified. Specifications in BOLD indicate a
temperature of -40°C to +85°C.
Notes:
2. The dropout voltage is defined as VIN - VOUT
, which is measured when VOUT is VOUT - 100mV.
3. The current limit was measured by the constant current limit value when VOUT is shorted directly. It is noted that the output capacitor current was
not included.
Symbol Parameter Conditions Min. Typ. Max. Units
INPUT STAGE
VIN Input Voltage Range VOUT = 1.2V, IOUT = 100mA 1.3 5.5 V
VCNTL Input Control Voltage 3 5.5 V
VPOR POR 2.4 2.7 3 V
VUVLO_HYS Under-Voltage Lockout Hysteresis 300 mV
ICNTL Input Supply Current EN = IN, VOUT = VFB, no load 0.5 1 mA
EN = AGND 20 μA
VFB Feedback Reference Voltage TA = 25 ºC, no load 0.788 0.800 0.812 V
IFB Feedback Bias Current 0.02 μA
REGULATION
∆VFB
Line Regulation (VIN)V
IN = 1.4V to 5V, IOUT = 100mA,
VOUT = 1.2V
0.015 0.15 % / ∆V
Load Regulation VIN = 1.8V, IOUT = 100mA to 2A,
VOUT = 1.2V
0.45 1.5 %
VDROP(2) Drop Voltage
IOUT = 300mA, VEN = VCNTL = 5V,
VOUT = 1.2V
40 50 mV
IOUT = 2A, VEN = VCNTL = 5V,
VOUT = 1.2V
180 250 mV
RPULL-DOWN VOUT Pull-down 90 Ω
ENABLE / POK
VEN_HI Enable High Level 1.2 V
VEN_LOW Disable Low Level 0.2 V
IEN Enable Bias Current VEN = 5.5V 12 μA
VPOK_TH POK Threshold VIN = VEN = VCNTL = 5V, No load,
VOUT = 1.2V
90 %
VPOK_HYS POK Hysteresis VIN = VEN = VCNTL = 5V, No load,
VOUT = 1.2V
10 %
TPOK_ON POK Time Delay (ON) VIN = VEN = VCNTL = 5V, No load,
VFB > 90%*VREF
1ms
TPOK_OFF POK Time Delay (OFF) VIN = VEN = VCNTL = 5V, No load,
VFB < 10%*VREF
50 μs
VPOK_LOW POK Pull-low Voltage POK sink current = 5mA 0.35 V
PROTECTION
ILIM(3) Current Limit 3.5 A
ISC Short Circuit Current VOUT < 0.2V 0.8 A
TSD Thermal Shutdown Threshold 160 ºC
∆TSD Thermal Shutdown Hysteresis 60 ºC
AOZ2023
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Functional Characteristics
Circuit of Typical Application 1. TA = 25°C, VIN = 1.5V, VCNTL = 5V, VOUT = 1.05V, unless otherwise specified.
5ms/div
5ms/div
VIN Line Transient Response (0A) VIN Line Transient Response (2A)
Load Transient Response (3A)
2ms/div2ms/div
IO
(1A/div)
VO(AC)
(10mV/div)
IO
(1A/div)
VO(AC)
(10mV/div)
IO
(1A/div)
VO(AC)
(10mV/div)
VIN
(1V/div)
IO
(1A/div)
VIN
(1V/div)
VO(AC)
(10V/div)
IO
(2A/div)
VEN
(2V/div)
VO
(1V/div)
VPOK
(2V/div)
Load Transient Response (1A)
500µs/div
500µs/div
Start-Up From Enable Start-Up From VIN
IO
(2A/div)
VIN
(1V/div)
VO
(1V/div)
VPOK
(2V/div)
AOZ2023
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Functional Characteristics (Continued)
Circuit of Typical Application 1. TA = 25°C, VIN = 1.5V, VCNTL = 5V, VOUT = 1.05V, unless otherwise specified.
500µs/div
20ms/div
Over Temperature Protection (VIN = 5V) Current Limit
Short Current Protection
500µs/div500µs/div
IO
(2A/div)
VO
(1V/div)
IO
(2A/div)
VIN
(5V/div)
VO
(1V/div)
IO
(2A/div)
VO
(1V/div)
Start-Up From VCNTL
IO
(2A/div)
VCNTL
(2V/div)
VO
(1V/div)
VPOK
(2V/div)
AOZ2023
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Typical Performance Characteristics
Circuit of Typical Application 1. TA = 25°C, VIN = 1.5V, VCNTL = 5V, VOUT = 1.05V, unless otherwise specified.
Temperature (°C)Load (A)
Voltage Drop (mV)
Current Limit (A)
VCNTL Standby Current (µA)
Short Circuit Current (A)
0 0.4 0.8 1.2 1.6 2.0
90°C
25°C
-40°C
250
200
150
100
50
0-40 -20 0 20 40 60 80
4.0
3.9
3.8
3.7
3.6
3.5
3.4
3.3
3.2
3.1
3.0
Temperature (°C)
-40 -20 0 20 40 60 80
0.11
0.10
0.08
0.09
0.06
0.07
0.05
0.03
0.04
0.01
0.02
Temperature (°C)
-40 -20 0 20 40 60 80
1.50
1.45
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
1.00
VCNTL POR Voltage (V)
Temperature (°C)
-40 -20 0 20 40 60 80
2.90
2.85
3.00
2.95
2.75
2.80
2.65
2.70
2.60
2.50
2.55
2.40
2.45
Dropout Voltage vs. Load Current Current Limit vs. Temperature
VCNTL Standby Current vs. Temperature
VCNTL POR Threshold Voltage vs. Temperature
Short Circuit vs. Temperature
Reference Voltage (V)
Temperature (°C)
-40 -20 0 20 40 60 80
0.820
0.815
0.810
0.805
0.800
0.795
0.790
0.785
0.780
0.775
0.770
Reference Voltage vs. Temperature
AOZ2023
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Application Information
Output Voltage Setting
The output voltage can be set by the output voltage
divider. Typically, the adjustable range of the output
voltage is from 1V to (VIN - Vdrop). The output voltage is
set by the equation below:
Supply Voltage (VCNTL)
Supply voltage is used to provide the power for the
internal circuits. For the device to regulate, the voltage on
this pin must be at least 1.5V greater than the output
voltage, and no less than VCNTL_min. A 0.1μF or more
ceramic capacitor close to the pin is required to filter the
control voltage.
Enable (EN)
The EN pin is used to turn off the regulator by pulling this
pin below 0.8V. When the linear regulator is operated in
the disable mode, the quiescent current can be limited
below several ten micro-amp level.
Input / Output Capacitor
A 10μF or more capacitances for the input side (VIN) is
necessary. This not only decouples the noise from input
side, but also keeps the input impedance as low as
possible. In addition, a 22μF or more capacitances for the
VIN above 4.5V is recommended for much lower input
impedance.
A 10μF output capacitor is typically used with a 0.1μF
ceramic capacitor for the output terminal (VOUT).
Internal type-II compensation network allows lower ESR
capacitors without stability problem.
Power OK (POK)
The POK pin is used to provide a logic signal to notice
that the regulator works well. When the output voltage
through the voltage divider is regulated above 90% of
reference voltage, this pin will be as a high impedance
status due to the open-drain output. An external pull-up
resister is necessary to provide high-level signal. The
sink capability of the POK pin is limited below 5mA.
Typically, a 5.1kΩ resister for the 5V is recommended.
Over Temperature Protection (OTP)
It is recommended that the junction temperature can be
kept below the recommended operation condition 125
degree for maximum reliability. This power dissipation is
conducted through the package into the ambient
environment, and, in the process, the temperature of the
die (TJ) rises above ambient.
VOUT 0.8VR1R2+
R2
----------------------
×=
AOZ2023
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Package Dimensions, SO-8 EP1
Notes:
1. Package body sizes exclude mold flash and gate burrs.
2. Dimension L is measured in gauge plane.
3. Tolerance 0.10mm unless otherwise specified.
4. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact.
5. Die pad exposure size is according to lead frame design.
6. Followed from JEDEC MS-012
Symbols
A
A1
A2
B
C
D
D0
D1
E
e
E1
E2
E3
L
y
θ
| L1–L1' |
L1
Dimensions in millimeters
RECOMMENDED LAND PATTERN
Min.
1.40
0.00
1.40
0.31
0.17
4.80
3.20
3.10
5.80
—
3.80
2.21
0.40
—
0°
—
D0
UNIT: mm
θ
Nom.
1.55
0.05
1.50
0.406
—
4.96
3.40
3.30
6.00
1.27
3.90
2.41
0.40 REF
0.95
—
3°
0.04
1.04 REF
Max.
1.70
0.10
1.60
0.51
0.25
5.00
3.60
3.50
6.20
—
4.00
2.61
1.27
0.10
8°
0.12
Dimensions in inches
D1
E1 E
E3E2
Note 5
L1'
L1
L
Gauge plane
0.2500
C
D
7 (4x)
B
3.70
2.20
2.87
2.71
5.74
1.27
0.80
0.635
eA1
A2 A
Symbols
A
A1
A2
B
C
D
D0
D1
E
e
E1
E2
E3
L
y
θ
| L1–L1' |
L1
Min.
0.055
0.000
0.055
0.012
0.007
0.189
0.126
0.122
0.228
—
0.150
0.087
0.016
—
0°
—
Nom.
0.061
0.002
0.059
0.016
—
0.195
0.134
0.130
0.236
0.050
0.153
0.095
0.016 REF
0.037
—
3°
0.002
0.041 REF
Max.
0.067
0.004
0.063
0.020
0.010
0.197
0.142
0.138
0.244
—
0.157
0.103
0.050
0.004
8°
0.005
AOZ2023
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Tape and Reel Dimensions, SO-8 EP1
Carrier Tape
Reel
Tape Size
12mm
Reel Size
ø330
M
ø330.00
±0.50
Package
SO-8
(12mm)
A0
6.40
±0.10
B0
5.20
±0.10
K0
2.10
±0.10
D0
1.60
±0.10
D1
1.50
±0.10
E
12.00
±0.10
E1
1.75
±0.10
E2
5.50
±0.10
P0
8.00
±0.10
P1
4.00
±0.10
P2
2.00
±0.10
T
0.25
±0.10
N
ø97.00
±0.10
K0
UNIT: mm
B0
G
M
W1
S
K
H
N
W
V
R
Trailer Tape
300mm min. or
75 empty pockets
Components Tape
Orientation in Pocket
Leader Tape
500mm min. or
125 empty pockets
A0
P1
P2
Feeding Direction
P0
E2
E1
E
D0
T
D1
W
13.00
±0.30
W1
17.40
±1.00
H
ø13.00
+0.50/-0.20
K
10.60
S
2.00
±0.50
G
—
R
—
V
—
Leader/Trailer and Orientation
UNIT: mm
AOZ2023
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Part Marking
Z2023PI
FAY Part Number Code
Assembly Lot Code
Year & Week Code
WLT
Fab & Assembly Location
AOZ2023PI
(SO-8)
As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant into
the body or (b) support or sustain life, and (c) whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of
the user.
2. A critical component in any component of a life
support, device, or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
LEGAL DISCLA IM ER
Alpha and Omega Semiconductor makes no representations or warranties with respect to the accuracy or
completeness of the information provided herein and takes no liabilities for the consequences of use of such
information or any product described herein. Alpha and Omega Semiconductor reserves the right to make changes
to such information at any time without further notice. This document does not constitute the grant of any intellectual
property rights or representation of non-infringement of any third party’s intellectual property rights.
LIFE SUPPORT POLICY
ALPHA AND OMEGA SEMICONDUCTOR PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL
COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS.
