AOSMD AOZ2003

AOZ2003
3A Ultra Low Dropout Linear Regulator
General Description
Features
The AOZ2003 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 AOZ2003 delivers
high-current and ultra low-drop output voltage for
applications where VOUT is very close to VIN.
 Ultra low dropout linear regulator
 1.35V~5.5V VIN supply voltage with external control
voltage
 Dropout voltage (typical):
180mV @ 2A
270mV @ 3A
 High accuracy output voltage +1.5%
The AOZ2003 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.
 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
The AOZ2003 is available in exposed pad SO-8
package.
 Green product and RoHS compliant
Applications
 Desktop, notebook PCs
 Workstations
 Graphic cards
 Low voltage logic supplies
 Gaming
 SMPS post regulators
Typical Application
5V
VCNTL
C2
1μF
R3
5.1kΩ
4
C3
10μF
CNTL
POK
1
VIN
POK
VOUT
3
1.072V
6
2
EN
FB
CO
22μF
7
GND
8
Rev. 1.1 August 2012
VOUT
C1
optional
AOZ2003
EN
1.8V
VIN
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R2
12kΩ
R1
4kΩ
Page 1 of 12
AOZ2003
Ordering Information
Part Number
Ambient Temperature Range
Package
Environmental
AOZ2003PI
-40 °C to +85 °C
EPAD SO-8
Green Product
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
POK
1
EN
2
VIN
3
VCNTL
4
8
GND
Exposed
PAD
7
FB
GND
6
VOUT
5
NC
EPAD SO-8
(Top View)
Pin Description
Pin Number
Pin Name
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 3V greater than
the output voltage, and no less than VCNTL_min.
5
NC
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.
Rev. 1.1 August 2012
Pin Function
Not Internally Connected.
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Page 2 of 12
AOZ2003
Block Diagram
EN
OTP
VCNTL
VIN
POR
Softstart &
Control Logic
OCP
FB
0.8V Vref
VOUT
0.1V
POK
Delay
90% Vref
GND
Rev. 1.1 August 2012
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Page 3 of 12
AOZ2003
Absolute Maximum Ratings
Recommended Operating Conditions
Exceeding the Absolute Maximum Ratings may damage the
device.
The device is not guaranteed to operate beyond the
Recommended Operating Conditions.Electrical Characteristics
Parameter
Rating
Parameter
Rating
VIN
1V to 6V
Supply Voltage (VIN)
VCNTL
3V to 6V
Supply Control Voltage (VCNTL)
VOUT
Other Pins
ESD Rating
(1)
1.35V to 5V
3V to 5V
0.8V to 6V
Junction Temperature (TJ)
-40°C to +125°C
-0.3V to 6V
Ambient Temperature (TA)
-40°C to +85°C
2kV
Note:
1. Devices are inherently ESD sensitive, handling precautions are
required. Human body model rating: 1.5kΩ in series with 100pF.
Power Dissipation (PD)
2W
Package Thermal Resistance
EPAD SO-8 (JA)
50°C/W
Electrical Characteristics
TA = 25 °C, VIN = 1.7V, VCNTL = VEN = 5V, CIN = COUT = 10F, unless otherwise specified. Specifications in BOLD indicate a
temperature of -40°C to +85°C.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
5.5
V
5.5
V
3
V
INPUT STAGE
VIN
Input Voltage Range
VCNTL
Input Control Voltage
VPOR
POR
VUVLO_HYS
ICNTL
IOUT = 100mA
1.35
3
2.4
Under-Voltage Lockout Hysteresis
Input Supply Current
VFB
Feedback Reference Voltage
IFB
Feedback Bias Current
2.7
300
EN = IN, VOUT = VFB, no load
0.5
EN = AGND
TA = 25 ºC, no load
0.788
0.800
mV
1
mA
20
A
0.812
V
A
0.02
REGULATION
∆VFB
VDROP(1)
Line Regulation (VIN)
VIN = 1.4V to 5V, IOUT = 100mA,
VOUT = 1.2 V
0.015
0.15
% / ∆V
Line Regulation (VCNTL)
VCNTL = 3V to 5V, IOUT = 100mA,
VOUT = 1.2V
0.015
0.15
% / ∆V
Load Regulation
VIN = 1.8V, IOUT = 100mA to 3A,
VOUT = 1.2V
0.45
1.5
%
IOUT = 300mA, VEN = VCNTL = 5V,
VOUT = 1.2V
50
75
mV
IOUT = 2A, VEN = VCNTL = 5V,
VOUT = 1.2V
180
250
mV
IOUT = 3A, VEN = VCNTL = 5V,
VOUT = 1.2V
270
350
mV
Drop Voltage
RPULL-DOWN VOUT Pull-down
Rev. 1.1 August 2012
90
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Ω
Page 4 of 12
AOZ2003
Electrical Characteristics (continued)
TA = 25 °C, VIN = 1.7V, VCNTL = VEN = 5V, CIN = COUT = 10F, unless otherwise specified. Specifications in BOLD indicate a
temperature of -40°C to +85°C.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
ENABLE / POK
VEN_HI
Enable High Level
VEN_LOW
Disable Low Level
1.2
V
0.2
V
Enable Bias Current
VEN = 5.5V
12
A
VPOK_TH
POK Threshold
VIN = VEN =VCNTL = 5V, No load,
VOUT = 1.2 V
90
%
VPOK_HYS
POK Hysteresis
VIN = VEN =VCNTL = 5V, No load,
VOUT = 1.2 V
10
%
TPOK_ON
POK Time Delay (ON)
VIN = VEN =VCNTL = 5V, No load,
VFB > 90%*VREF
2
ms
TPOK_OFF
POK Time Delay (OFF)
VIN = VEN =VCNTL = 5V, No load,
VFB < 10%*VREF
50
s
VPOK_LOW
POK Pull-low Voltage
POK sink current = 5mA
IEN
0.45
V
PROTECTION
ILIM(2)
Current Limit
3.2
A
ISC
Short Circuit Current
1.4
A
TSD
Thermal Shutdown Threshold
160
ºC
∆TSD
Thermal Shutdown Hysteresis
30
ºC
100
ºC
Thermal Shutdown Temperature Reset
VOUT < 0.1V
4
VOUT < 0.1V
Note:
1. The dropout voltage is defined as VIN - VOUT, which is measured when VOUT is VOUT - 100mV.
2. 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.
Rev. 1.1 August 2012
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Page 5 of 12
AOZ2003
Functional Characteristics
Load Transient Response
Load Transient Response
VO(AC)
(10mV/div)
VO(AC)
(10mV/div)
IO
(1A/div)
IO
(1A/div)
2ms/div
2ms/div
VIN Line Transient Response (0A)
VIN Line Transient Response (3A)
VIN
(1V/div)
VIN
(1V/div)
VO
(50mV/div)
VO
(50mV/div)
5ms/div
5ms/div
Start-Up From Enable
Start-Up From VIN
800μs
VEN
(1V/div)
1.5ms
VO
(1V/div)
VO
VPOK
VPOK
(2V/div)
VO
(1V/div)
VO
VPOK
VPOK
(2V/div)
IO
(2A/div)
IO
(2A/div)
1ms/div
500μs/div
Rev. 1.1 August 2012
VEN
(1V/div)
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Page 6 of 12
AOZ2003
Functional Characteristics (continued)
Start-Up From VCNTL
Short Current Protection
1ms
VIN
(1V/div)
VCNTL
(5V/div)
VO
(1V/div)
VO
(500mV/div)
VPOK
(1V/div)
IO
(2A/div)
500μs/div
IO
(2A/div)
10μs/div
Over Temperature Protection (VIN = 3.3V)
Current Limit
VIN
(1V/div)
VO
(1V/div)
VO
(200mV/div)
IO
(1A/div)
IO
(2A/div)
400μs/div
20ms/div
Rev. 1.1 August 2012
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Page 7 of 12
AOZ2003
Typical Performance Characteristics
Circuit of Typical Application. TA = 25°C, VIN = 1.8V, VCNTL = 5V, VOUT = 1.2V, unless otherwise specified.
Dropout Voltage vs. Load Current
Short Circuit vs. Temperature
300
2.0
Short Circuit Current (A)
1.9
Voltage Drop (mV)
250
85°C
200
25°C
150
-40°C
100
50
0.5
1.0
1.5
2.0
2.5
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
-40
0
0
1.8
3.0
-20
0
Load (A)
10
0.830
9
0.825
8
7
6
5
4
3
2
-20
0
20
40
60
80
Reference Voltage vs. Temperature
Reference Voltage (V)
VCNTL Standby Current (µA)
VCNTL Standby Current vs. Temperature
1
0
-40
20
Temperature (°C)
40
60
80
0.820
0.815
0.810
0.805
0.800
0.795
0.790
0.785
0.780
-40
Temperature (°C)
-20
0
20
40
60
80
Temperature (°C)
VCNTL POR Voltage (V)
VCNTL POR Threshold Voltage vs. Temperature
3.00
2.95
2.90
2.85
2.80
2.75
2.70
2.65
2.60
2.55
2.50
2.45
2.40
-40
-20
0
20
40
60
80
Temperature (°C)
Rev. 1.1 August 2012
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Page 8 of 12
AOZ2003
Application Information
Input / Output Capacitor
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 (1).
R1 + R2
V OUT = 0.8V  ---------------------R2
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.
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 3V 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.
Rev. 1.1 August 2012
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.
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.
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Page 9 of 12
AOZ2003
Package Dimensions, SO-8 EP1
Gauge plane
0.2500
D0
C
L
L1
E2
E1
E3
E
L1'
D1
Note 5
D
θ
7 (4x)
A2
e
B
A
A1
Dimensions in millimeters
RECOMMENDED LAND PATTERN
3.70
2.20
5.74
2.71
2.87
0.80
1.27
0.635
UNIT: mm
Symbols
A
Min.
1.40
Nom.
1.55
A1
A2
B
0.00
1.40
0.31
0.05
1.50
0.406
C
D
0.17
4.80
—
4.96
D0
D1
E
e
E1
E2
E3
L
y
θ
| L1–L1' |
L1
3.20
3.10
5.80
—
3.80
2.21
Max.
1.70
0.10
1.60
0.51
0.25
5.00
3.60
3.50
6.20
—
4.00
2.61
3.40
3.30
6.00
1.27
3.90
2.41
0.40 REF
1.27
0.40
0.95
0.10
—
—
0°
—
8°
3°
0.04
0.12
1.04 REF
Dimensions in inches
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
Nom.
0.061
0.002
Max.
0.067
0.004
0.059
0.016
—
0.063
0.020
0.010
0.195 0.197
0.134 0.142
0.130 0.138
0.236 0.244
0.050
—
0.153 0.157
0.095 0.103
0.016 REF
0.016 0.037 0.050
—
0.004
—
0.126
0.122
0.228
—
0.150
0.087
0°
—
3°
8°
0.002 0.005
0.041 REF
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
Rev. 1.1 August 2012
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Page 10 of 12
AOZ2003
Tape and Reel Dimensions, SO-8 EP1
Carrier Tape
P1
D1
P2
T
E1
E2
E
B0
K0
A0
D0
P0
Feeding Direction
UNIT: mm
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
Reel
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
W1
S
G
N
M
K
V
R
H
W
UNIT: mm
W
N
Tape Size Reel Size
M
12mm
ø330
ø330.00 ø97.00 13.00
±0.10 ±0.30
±0.50
W1
17.40
±1.00
H
K
ø13.00
10.60
+0.50/-0.20
S
2.00
±0.50
G
—
R
—
V
—
Leader/Trailer and Orientation
Trailer Tape
300mm min. or
75 empty pockets
Rev. 1.1 August 2012
Components Tape
Orientation in Pocket
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Leader Tape
500mm min. or
125 empty pockets
Page 11 of 12
AOZ2003
Part Marking
AOZ2003PI
(SO-8 EP1)
Z2003PI
FAYWLT
Part Number Code
Assembly Lot Code
Fab & Assembly Location
Year & Week Code
LEGAL DISCLAIMER
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.
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.
Rev. 1.1 August 2012
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.
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Page 12 of 12