D2940
1A Low-Dropout Voltage Regulator
General Description
The D2940 is a low dropout regulator designed to provide output current up
to 1A with a typical 500mV dropout Voltage and a maximum of 1V. It is capable
of reducing the ground current when the differential between the input voltage
and the output voltage outrun 3V.
The D2940 offers low quiescent current (typical current 30mA at 1A and an
1
1
SOT-223
TO-252
input-output differential of 5V). Higher quiescent currents only exist when the
regulator is in the dropout mode (VIN-VOUT≤3V).
The D2940 is available in SOT-223 ,TO-252 ,TO-220 and TO-263 package.
Features
500mV Typical Dropout at 1A
Output Current In Excess of 1A
Low Quiescent Current
Reverse-Battery Protection
Current Limit and Thermal Shutdown
Mirror Image Insertion Protection
1
1
TO-220
TO-263
Applications
Powering VGA & Sound Card
LCD Monitor
Battery Powered Equipments / Laptop & Notebook
SMPS Post Regulator / DC to DC Modules
High Efficiency Linear Power Supply
Adjustable Power Supply
Bar Code Scanners
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Page 1 of 16
D2940
Functional Block Diagram
Pin Configuration
SOT-223
TO-252
TO-220
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TO-263
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D2940
Pin Description
Pin Number
SOT-223、TO-252
TO-220、TO-263
Pin Name
Function Description
1
INPUT
Input pin
2
GND
Ground
3
OUTPUT
Output pin
Absolute Maximum Ratings (Ta=25℃)
Parameter Name
Input Voltage
Internal Power Dissipation
Maximum Junction Temperature
Storage Temperature Range
Operating Temperature
*Note
Symbol
Vin
PD
TJ
TSTG
SOT-223
TO-252
TO-220
TO-263
TOPR
Value
26
Internally limited
150
-65 ~ +150
-40 ~ +85
-40 ~ +125
-40 ~ +125
-40 ~ +125
Unit
V
℃
℃
℃
Note:Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
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D2940
Electrical Characteristics
(VIN=VO+5V, IOUT=1A, CO=22µF, TA = TJ = 25℃, Unless otherwise specified. )
Parameter Name
Symbol
Output Voltage
Vout
Line Regulation
LNR
Load Regulation
LDR
Output Impedance
Ro
Quiescent Current
IQ
Output Noise
Voltage
Ripple
Rejection
Long Term
Stability
RR
Dropout
Voltage
VD
Short Circuit
Current
Maximum Line
Transient
Reverse Polarity
DC Input Voltage
Reverse Polarity
Transient Input
Voltage
Note:
eN
Test Conditions
5mA≤IO≤1A
D2940-5V
Min
Max
6.25V ≤ VIN ≤ 26V
4.85
VO+2V ≤ VIN ≤ 26V
IO = 5mA
50mA ≤ IO ≤ 1A
100mADC and
20mArms,
fO =120Hz
5.00
5.15
20
35
Min
10
7.76
Max
Unit
V
8.00
8.24
50
20
80
mV
50
55
80
mV
55
15
10
150
60
Typ
9.4V ≤ VIN ≤ 26V
35
VO+2V ≤ VIN ≤ 26V
IO =5mA
10Hz ~ 100kHz,
IO =5mA
fO =120Hz, 1Vrms
IO =100mA
Typ
D2940-8V
72
54
mΩ
15
mA
240
µVrms
66
dB
IO =1A
0.5
0.8
0.5
0.8
mV/
1000Hr
V
IO =100mA
110
150
110
150
mV
20
Isc
32
1.6
1.9
1.6
1.9
A
60
75
60
75
V
TIN
RO =100Ω
T ≤ 100ms
VRIN
RO =100Ω
-30
-15
-30
-15
V
VTRRI
RO =100Ω
T ≤ 100ms
-75
-50
-75
-50
V
Output current will decrease with temperature increase but will not drop below 1A at the maximum
specified temperature.
\
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Page 4 of 16
D2940
Electrical Characteristics (Cont.)
(VIN=VO+5V, IO=1A, CO=22µF, TA = TJ = 25℃, unless otherwise specified. )
Parameter Name
Symbol
Output Voltage
Vout
Line Regulation
LNR
Load Regulation
LDR
Output Impedance
Ro
Quiescent Current
IQ
Output Noise
Voltage
eN
Ripple Rejection
RR
Long term
Stability
Dropout Voltage
Short Circuit
Current
Maximum Line
Transient
Reverse Polarity
DC Input Voltage
Reverse Polarity
Transient Input
Voltage
Note:
Test Conditions
5mA ≤ IO ≤ 1A
D2940-9V
Min
Max
10.5V ≤ VIN ≤ 26V
8.73
VO+2V≤VIN≤26V
IO =5mA
50mA≤IO≤1A
100mADC and
20mArms,
fO =120Hz
9.00
9.27
20
60
Min
10
9.70
Unit
V
10.3
90
20
100
mV
90
65
100
mV
65
15
10
64
51
mΩ
15
mA
300
µVrms
63
dB
IO =1A
0.5
0.8
0.5
0.8
mV/
1000Hr
V
IO =100mA
110
150
110
150
mV
34
VD
Max
10.0
270
52
Typ
11.5V ≤ VIN ≤ 26V
60
VO+2V≤VIN≤26V
IO =5mA
10Hz ~ 100kHz,
IO =5mA
fO =120Hz, 1Vrms
IO =100mA
Typ
D2940-10V
Isc
36
1.6
1.9
1.6
1.9
A
60
75
60
75
V
TIN
RO =100Ω
T≤100ms
VRIN
RO =100Ω
-30
-15
-30
-15
V
VTRRI
RO =100Ω
T≤100ms
-75
-50
-75
-50
V
Output current will decrease with temperature increase but will not drop below 1A at the maximum
specified temperature.
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D2940
Electrical Characteristics (Cont.)
(VIN=VO+5V, IO=1A, CO=22µF, TA = TJ = 25℃, Unless otherwise specified. )
Parameter
Name
Symbol
Output Voltage
Vout
Line Regulation
LNR
Load Regulation
LDR
Output
Impedance
Ro
Quiescent
Current
IQ
Output Noise
Voltage
eN
Ripple Rejection
RR
Long term
Stability
Dropout Voltage
Short Circuit
Current
Maximum Line
Transient
Reverse Polarity
DC Input
Voltage
Reverse Polarity
Transient Input
Voltage
Note:
Test Conditions
5mA≤IO≤1A
D2940-12V
Min
Max
13.6V≤VIN≤26V
11.64
VO+2V≤VIN≤26V
IO =5mA
50mA≤IO≤1A
100mADC and
20mArms,
fO =120Hz
12.0
12.36
20
55
Min
10
14.55
Unit
V
15.45
120
20
150
mV
120
70
150
mV
100
15
10
66
52
mΩ
15
mA
450
µVrms
64
dB
IO =1A
0.5
0.8
0.5
0.8
mV/
1000Hr
V
IO =100mA
110
150
110
150
mV
48
VD
Max
15.0
360
54
Typ
16.75V≤VIN≤26V
80
VO+2V≤VIN≤26V
IO =5mA
10Hz-100kHz,
IO =5mA
fO =120Hz, 1Vrms
IO =100mA
Typ
D2940-15V
Isc
60
1.6
1.9
1.6
1.9
A
60
75
60
75
V
TIN
RO =100Ω
T≤100ms
VRIN
RO =100Ω
-30
-15
-30
-15
V
VTRRI
RO =100Ω
T≤100ms
-75
-50
-75
-50
V
Output current will decrease with temperature increase but will not drop below 1A at the maximum
specified temperature.
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Page 6 of 16
D2940
Typical Application
Note:1.C1 is required if regulator is located far from power supply filter.
2.COUT must be higher than 22μF for stability, and locate as close as possible to the regulator.
Application Information
External Capacitors
The output capacitor is critical to maintaining regulator stability, and must meet the required conditions for
both ESR (Equivalent Series Resistance) and minimum amount of capacitance.
Minimum Capacitance:
The minimum output capacitance required to maintain stability is 22 μF (this value may be increased without
limit). Larger values of output capacitance will give improved transient response.
ESR Limits:
The ESR of the output capacitor will cause loop instability if it is too high or too low. The acceptable range
of ESR plotted versus load current is shown in the graph below. It is essential that the output capacitor meet these
requirements, or oscillations can result.
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D2940
ESR Limits
It is important to note that for most capacitors, ESR is specified only at room temperature. However, the
designer must ensure that the ESR will stay inside the limits shown over the entire operating temperature range for
the design.
For aluminum electrolytic capacitors, ESR will increase by about 30X as the temperature is reduced from
25°C to −40°C. This type of capacitor is not well-suited for low temperature operation.
Solid tantalum capacitors have a more stable ESR over temperature, but are more expensive than aluminum
electrolytics. A cost-effective approach sometimes used is to parallel an aluminum electrolytic with a solid
Tantalum, with the total capacitance split about 75/25% with the Aluminum being the larger value.
If two capacitors are paralleled, the effective ESR is the parallel of the two individual values. The “flatter”
ESR of the Tantalum will keep the effective ESR from rising as quickly at low temperatures.
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D2940
Characteristics Curve
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D2940
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D2940
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D2940
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D2940
Outline Dimensions
TO-252
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Unit: mm
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D2940
SOT-223
Unit: mm
TO-220
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Unit: mm
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Page 14 of 16
D2940
TO-263
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Unit: mm
CHMC
May. 2015 Rev. 1.0
Page 15 of 16
D2940
Statements
Silicore Technology reserves the right to make changes without further notice to any products or
specifications herein. Before customers place an order, customers need to confirm whether datasheet
obtained is the latest version, and to verify the integrity of the relevant information.
Failure or malfunction of any semiconductor products may occur under particular conditions, customers
shall have obligation to comply with safety standards when customers use Silicore Technology products to
do their system design and machine manufacturing, and take corresponding safety measures in order to
avoid potential risk of failure that may cause personal injury or property damage.
The product upgrades without end, Silicore Technology will wholeheartedly provide customers integrated
circuits that have better performance and better quality.
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