A Product Line of
Diodes Incorporated
AZ2940
1A ULTRA LOW DROPOUT LINEAR REGULATOR
Description
The AZ2940 is a low dropout three-terminal regulator with a typical
dropout of 280mV at 1A output current.
The AZ2940 provides current limit and thermal shutdown. On-chip
thermal shutdown provides protection against any combination of high
current and ambient temperature that would create excessive junction
temperatures.
The AZ2940 has 1.2V, 1.8V, 2.5V, 3.3V and 5.0V versions.
The AZ2940 series is available in the industry standard TO-220-3,
TO-220F-3, TO-263-3, TO-252-2 (3), TO-252-2 (4), TO-252-2 (5) and
SOT-223 power packages. (Detailed information please refer to
pages 13, 14)
Features
Minimum Guaranteed Output Current: 1A
Dropout Voltage at I
OUT
= 1A: 280mV Typ. (Except 1.2V and 1.8V
Versions)
Output Accuracy:
1%
Low Ground Current
Internal Current Limit and Thermal Protection
Reversed-battery and Reversed-lead Insertion Protection
Fast Transient Response
TO-220-3, TO-263-3, TO-252-2 (3), TO-252-2 (4), TO-252-2 (5)
Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
Available in “Green” Packages: TO-220-3, TO-220F-3, TO-263-3,
TO-252-2 (3), TO-252-2 (4), TO-252-2 (5) and SOT-223
Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
LCD TV
Set Top Box
LCD Monitor
SMPS Post Regulator
Laptop, Palmtop and Notebook
Portable Instrumentation
USB Power Supply
Notes:
1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Pin Assignments
(Front View)
3
2
1
V
OUT
GND
V
IN
(Front View)
3
2
1
V
OUT
GND
V
IN
TO-220-3 (Option 1)
(Front View)
TO-220-3 (Option 2)
(Front View)
3
2
1
3
2
1
V
OUT
GND
V
IN
V
OUT
GND
V
IN
TO-220-3 (Option 3)
TO-220F-3
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© Diodes Incorporated
AZ2940
Document number: DS37880 Rev. 3 - 2
A Product Line of
Diodes Incorporated
AZ2940
Pin Assignments
(Cont.)
(Top View)
3
2
1
V
OUT
GND
V
IN
(Top View)
3
2
1
V
OUT
(Top View)
3
2
1
V
OUT
GND
GND
V
IN
V
IN
TO-263-3
(Top View)
TO-252-2 (3) (Option 1)
(Top View)
3
2
1
TO-252-2 (3) (Option 2)
(Top View)
V
OUT
GND
V
IN
3
2
1
V
OUT
GND
V
IN
3
2
1
V
OUT
GND
V
IN
TO-252-2 (4)
TO-252-2 (5)
SOT-223
Typical Applications Circuit
(Note 4)
V
IN
1
V
IN
V
OUT
3
V
OUT
AZ2940
+
C
IN
+
GND
2
C
OUT
Note 4:
C
IN
is required if regulator is located far from power supply filter and is recommended to be 0.47µF or greater. To maintain stability, C
OUT
is recommended
to be 2.2µF or greater. The ESR of this capacitor is critical, please see curve.
Pin Description
Pin Number
1
2
3
Pin Name
V
IN
GND
V
OUT
Unregulated Input
Ground pin. This pin and TAB are internally connected
Regulated Output
Function
AZ2940
Document number: DS37880 Rev. 3 - 2
2 of 29
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June 2015
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AZ2940
Functional Block Diagram
V
IN
1
3
V
OUT
1.24V
Reference
16V
+
-
Thermal
Shutdown
2
GND
Absolute Maximum Ratings
(Note 5)
Symbol
V
IN
T
J
T
STG
T
LEAD
Input Voltage
Operating Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10sec)
Parameter
Rating
16
+150
-65 to +150
+260
TO-220-3/TO-220F-3
θ
JA
TO-263-3
Thermal Resistance (Junction to Ambient)
TO-252-2 (3)/(4)/(5)
SOT-223
ESD
ESD
ESD (Human Body Model)
ESD (Machine Model)
5000
300
100
120
V
V
60
60
o
Unit
V
o
C
C
C
o
o
C/W
Note 5:
Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Symbol
V
IN
T
J
Input Voltage
Operating Junction Temperature
Parameter
Min
2.5
-40
Max
13.2
+125
Unit
V
o
C
AZ2940
Document number: DS37880 Rev. 3 - 2
3 of 29
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June 2015
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AZ2940
Electrical Characteristics
AZ2940-1.2 Electrical Characteristics
(Operating Conditions: V
IN
= 2.5V, I
OUT
= 10mA, C
IN
= 10µF, C
OUT
= 10µF, T
J
= +25
o
C, unless otherwise specified. The
Boldface
applies over -
40
o
C to +125
o
C)
Symbol
Parameter
I
OUT
= 10mA
Condition
Min
1.188
1.176
–
–
–
Typ
1.2
1.2
3.6
5.4
–
12
18
2.2
1
400
7.8
29.7
Max
1.212
1.224
18
27
180
25
–
–
5
–
–
Unit
V
V
mV
mV
µV/
o
C
mA
mA
A
mA
µV
V
OUT
Output Voltage
10mA ≤ I
OUT
≤ 1A, 2.5V ≤ V
IN
≤ 13.2V
I
OUT
= 10mA, 2.5V ≤ V
IN
≤ 13.2V
V
IN
= 2.5V, 10mA ≤ I
OUT
≤ 1A
I
OUT
= 10mA
I
OUT
= 750mA
V
RLINE
V
RLOAD
∆V
OUT
/∆T
Line Regulation
Load Regulation
Output Voltage Temperature
Coefficient
Ground Current
–
–
1.5
–
–
–
–
I
GND
V
IN
= 2.5V
I
OUT
= 1A
I
SC
I
LOAD (MIN)
–
Short Circuit Current
Minimum Load Current
Output Noise Voltage (rms)
V
OUT
= 0V (Note 6)
–
10Hz to 100kHz, I
OUT
= 100mA,
C
OUT
= 10µF
TO-252-2 (3)/(4)/(5)
θ
JC
Thermal Resistance
SOT-223
–
o
C/W
Note 6:
V
IN
= V
OUT(NOMINAL)
+1V.
AZ2940
Document number: DS37880 Rev. 3 - 2
4 of 29
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June 2015
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AZ2940
Electrical Characteristics
(Cont.)
AZ2940-1.8 Electrical Characteristics
(Operating Conditions: V
IN
= 2.8V, I
OUT
= 10mA, C
IN
= 10µF, C
OUT
= 10µF, T
J
= +25
o
C, unless otherwise specified. The
Boldface
applies over -
40
o
C to +125
o
C)
Symbol
Parameter
I
OUT
= 10mA
Condition
Min
1.782
1.764
–
–
–
Typ
1.8
1.8
3.6
5.4
36
290
330
12
18
2.2
1
400
7.8
29.7
Max
1.818
1.836
18
27
180
500
750
25
–
–
5
–
–
Unit
V
V
mV
mV
µV/
o
C
mV
mV
mA
mA
A
mA
µV
V
OUT
Output Voltage
10mA ≤ I
OUT
≤ 1A, 2.8V ≤ V
IN
≤ 13.2V
I
OUT
= 10mA, 2.8V ≤ V
IN
≤ 13.2V
V
IN
= 2.8V, 10mA ≤ I
OUT
≤ 1A
I
OUT
= 10mA
I
OUT
= 100mA
V
RLINE
V
RLOAD
∆V
OUT
/∆T
Line Regulation
Load Regulation
Output Voltage Temperature
Coefficient
Dropout Voltage (Note 7)
–
–
–
–
1.5
–
–
–
–
V
DROP
∆V
OUT
= 1%
I
OUT
= 1A
I
OUT
= 750mA
I
GND
Ground Current
V
IN
= 2.8V
I
OUT
= 1A
I
SC
I
LOAD (MIN)
–
Short Circuit Current
Minimum Load Current
Output Noise Voltage (rms)
V
OUT
= 0V (Note 6)
–
10Hz to 100kHz, I
OUT
= 100mA,
C
OUT
= 10µF
TO-252-2 (3)/(4)/(5)
θ
JC
Thermal Resistance
SOT-223
–
o
C/W
Notes:
6. V
IN
= V
OUT(NOMINAL)
+1V.
7. Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its nominal value which is measured at V
OUT
+1V
applied to V
IN
. In application, V
IN
should be no less than 2.5V.
AZ2940
Document number: DS37880 Rev. 3 - 2
5 of 29
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June 2015
© Diodes Incorporated
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