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PDF NCP1117LP Data sheet ( Hoja de datos )
| Número de pieza | NCP1117LP | |
| Descripción | 1.0 A Low-Dropout Positive Fixed and Adjustable Voltage Regulators | |
| Fabricantes | ON Semiconductor | |
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NCP1117LP
1.0 A Low-Dropout Positive
Fixed and Adjustable
Voltage Regulators
The NCP1117LP is the low power version of the popular NCP1117
family of low dropout voltage regulators, with reduced quiescent
current. It is intended primarily for high volume consumer
applications over the 0 to 125 degree temperature range. Capable of
providing an output current in excess of 1 A, with a dropout voltage of
1.3 V at 1 A full current load, the series consists of an adjustable and
five fixed voltage versions of 1.5 V, 1.8 V, 2.5 V, 3.3 V and 5.0 V.
Internal protection features consist of output current limiting and
built−in thermal shutdown. The NCP1117LP series can operate up to
18 V max input voltage. The device is available in the popular
SOT−223 and DPAK packages.
Features
• Output Current in Excess of 1.0 A
• 1.4 V Maximum Dropout Voltage at 1 A
• Quiescent Current over 10 times Lower than Traditional 1117
• Fixed Output Voltages of 1.5 V, 1.8 V, 2.5 V, 3.3 V and 5.0 V
• Adjustable Output Voltage Option
• No Minimum Load Requirement for Fixed Voltage Output Devices
• Good Noise Rejection
• Current Limit and Thermal Shutdown Protection
• Operation up to 18 V Input
• These are Pb−Free Devices
Applications
• TV and Monitors
• Set Top Boxes and Entertainment Devices
• Switching Power Supply Post Regulation
• Game Consoles and Consumer Applications
• Hard Drive Controllers
www.onsemi.com
1
3
SOT−223
ST SUFFIX
CASE 318H
Pin: 1. Adjust/Ground
2. Output
3. Input
MARKING
DIAGRAM
4
AYW
17Lxx G
G
1 23
Heatsink tab is connected to Pin 2.
xx = 15, 18, 25, 33, 50, AD
A = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
4 DPAK
DT SUFFIX
1 2 CASE 369C
3
AYWW
XXX
XXXXXG
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
TYPICAL APPLICATIONS
Input 3
+
Cin = 10 mF
NCP1117LP
1
2 Output
+
Cout = 10 mF
Input 3
2 Output
NCP1117LP
+
Cin = 10 mF
+
1 Cout = 10 mF
Figure 1. Fixed
Output Regulator
Figure 2. Adjustable
Output Regulator
© Semiconductor Components Industries, LLC, 2014
December, 2014 − Rev. 4
1
Publication Order Number:
NCP1117LP/D
1 page  
NCP1117LP
TYPICAL CHARACTERISTICS
570
560
550
540
530
520
510
500 Vin = 12 V
490
Iload = 10 mA
Cin = Cout = 10 mF
480
−40 −20 0 20 40 60 80 100 120
TA, AMBIENT TEMPERATURE (°C)
Figure 10. Quiescent Current vs. Temperature
Iload = 10 mA
100
90 Vin = 3 V
80
Vout = 1.25 V
Cin = 10 mF MLCC
70 Cout = 10 mF MLCC
60 Region of Stability TJ = 25°C
50
40
30
20
10 Region of Instability
0
0 0.2 0.4 0.6 0.8 1.0
Iout, OUTPUT CURRENT (A)
Figure 12. Equivalent Series Resistance vs.
Output Current − MLCC Capacitor
1.21
1.20
1.19
1.18
1.17
1.16
1.15
1.14
DVout = Vout − 100 mV
1.13
1.12
Cin = Cout = 10 mF
TJ = 25°C
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Iout, OUTPUT CURRENT (A)
Figure 11. Dropout Voltage vs. Output Current
100
10
Region of Instability
Region of Stability
1.0 Vin = 3 V
Vout = 1.25 V
Iload = 5 mA − 1 A
Cin = 10 mF MLCC
TJ = 25°C
0.1
0.001
0.01
0.1
ESR, EQUIVALENT SERIES RESISTANCE (W)
Figure 13. Output Capacitance vs. ESR
MLCC Capacitor
1
80
70
60
50
40
30 fripple = 120 Hz
20
Cin = 22 mF Tantalum
Cout = 22 mF Tantalum
10 Vin − Vout = 3 V
TA = 25°C
0
0 100 200 300 400 500 600 700 800 900 1000
Iout, OUTPUT CURRENT (A)
Figure 14. Ripple Rejection vs. Output Current
− 1.5 V
70
60
50
40
30
fripple = 120 Hz
20 Cin = 22 mF Tantalum
Cout = 22 mF Tantalum
10 Vin − Vout = 3 V
TA = 25°C
0
0 100 200 300 400 500 600 700 800 900 1000
Iout, OUTPUT CURRENT (A)
Figure 15. Ripple Rejection vs. Output Current
−5V
www.onsemi.com
5
5 Page 
NCP1117LP
Protection Diodes
The NCP1117LP family has two internal low impedance
diode paths that normally do not require protection when
used in the typical regulator applications. The first path
connects between Vout and Vin, and it can withstand a peak
surge current of about 15 A. Normal cycling of Vin cannot
generate a current surge of this magnitude. Only when Vin
is shorted or crowbarred to ground and Cout is greater than
50 mF, it becomes possible for device damage to occur.
Under these conditions, diode D1 is required to protect the
device. The second path connects between Cadj and Vout, and
it can withstand a peak surge current of about 150 mA.
Protection diode D2 is required if the output is shorted or
crowbarred to ground and Cadj is greater than 1.0 mF.
D1
Input
Cin
3 NCP1117LP
+
1
2
R1
D2
+
R2 Cadj
Output
+
Cout
Figure 35. Protection Diode Placement
A combination of protection diodes D1 and D2 may be
required in the event that Vin is shorted to ground and Cadj
is greater than 50 mF. The peak current capability stated for
the internal diodes are for a time of 100 ms with a junction
temperature of 25°C. These values may vary and are to be
used as a general guide.
Load Regulation
The NCP1117LP series is capable of providing excellent
load regulation; but since these are three terminal devices,
only partial remote load sensing is possible. There are two
conditions that must be met to achieve the maximum
available load regulation performance. The first is that the
top side of programming resistor R1 should be connected as
close to the regulator case as practicable. This will minimize
the voltage drop caused by wiring resistance RW + from
appearing in series with reference voltage that is across R1.
The second condition is that the ground end of R2 should be
connected directly to the load. This allows true Kelvin
sensing where the regulator compensates for the voltage
drop caused by wiring resistance RW −.
Input
Cin
32
NCP1117LP
RW+
+
+ 1 R1 Cout
R2
Output
Remote
Load
RW−
Figure 36. Load Sensing
Thermal Considerations
This series contains an internal thermal limiting circuit
that is designed to protect the regulator in the event that the
maximum junction temperature is exceeded. When
activated, typically at 165°C, the regulator output switches
off and then back on as the die cools. As a result, if the device
is continuously operated in an overheated condition, the
output will appear to be oscillating. This feature provides
protection from a catastrophic device failure due to
accidental overheating. It is not intended to be used as a
substitute for proper heatsinking. The maximum device
power dissipation can be calculated by:
PD
+
TJ(max) *
RqJA
TA
The devices are available in surface mount SOT−223
package. This package has an exposed metal tab that is
specifically designed to reduce the junction to air thermal
resistance, RqJA, by utilizing the printed circuit board
copper as a heat dissipater. Figure 32 shows typical RqJA
values that can be obtained from a square pattern using
economical single sided 1.0 oz and 2.0 oz copper board
material. The final product thermal limits should be tested
and quantified in order to insure acceptable performance and
reliability. The actual RqJA can vary considerably from the
graphs shown. This will be due to any changes made in the
copper aspect ratio of the final layout, adjacent heat sources,
and air flow.
Input
10
mF
3 NCP1117LP
+
1
2
Constant Current
Output
R
+ 10
mF
Iout
+
Vref
R
)
Iadj
Figure 37. Constant Current Regulator
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet NCP1117LP.PDF ] | |
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