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PDF LM1117DTX-2.85 Data sheet ( Hoja de datos )

Número de pieza LM1117DTX-2.85
Descripción 800mA Low-Dropout Linear Regulator
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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No Preview Available ! LM1117DTX-2.85 Hoja de datos, Descripción, Manual

February 2000
LM1117
800mA Low-Dropout Linear Regulator
General Description
The LM1117 is a series of low dropout voltage regulators
with a dropout of 1.2V at 800mA of load current. It has the
same pin-out as National Semiconductor’s industry standard
LM317.
The LM1117 is available in an adjustable version, which can
set the output voltage from 1.25V to 13.8V with only two ex-
ternal resistors. In addition, it is also available in five fixed
voltages, 1.8V, 2.5V, 2.85V, 3.3V, and 5V.
The LM1117 offers current limiting and thermal shutdown. Its
circuit includes a zener trimmed bandgap reference to as-
sure output voltage accuracy to within ±1%.
The LM1117 series is available in SOT-223, TO-220, and
TO-252 D-PAK packages. A minimum of 10µF tantalum ca-
pacitor is required at the output to improve the transient re-
sponse and stability.
Features
n Available in 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable
Versions
n Space Saving SOT-223 Package
n Current Limiting and Thermal Protection
n Output Current
n Temperature Range
n Line Regulation
n Load Regulation
800mA
0˚C to 125˚C
0.2% (Max)
0.4% (Max)
Applications
n 2.85V Model for SCSI-2 Active Termination
n Post Regulator for Switching DC/DC Converter
n High Efficiency Linear Regulators
n Battery Charger
n Battery Powered Instrumentation
Typical Application
Active Terminator for SCSI-2 Bus
Fixed Output Regulator
DS100919-5
DS100919-28
© 2000 National Semiconductor Corporation DS100919
www.national.com

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LM1117DTX-2.85 pdf
Electrical Characteristics (Continued)
Typicals and limits appearing in normal type apply for TJ = 25˚C. Limits appearing in Boldface type apply over the entire junc-
tion temperature range for operation, 0˚C to 125˚C.
Symbol
Parameter
Conditions
Min
(Note 5)
Typ
(Note 4)
Max
(Note 5)
Units
VOUT
Load Regulation
(Note 6)
VIN-V OUT Dropout Voltage
(Note 7)
ILIMIT
Current Limit
Minimum Load
Current (Note 8)
Quiescent Current
Thermal Regulation
Ripple Regulation
Adjust Pin Current
LM1117-ADJ
VIN-VOUT = 3V, 10 IOUT 800mA
LM1117-1.8
VIN = 3.2V, 0 IOUT 800mA
LM1117-2.5
VIN = 3.9V, 0 IOUT 800mA
LM1117-2.85
VIN = 4.25V, 0 IOUT 800mA
LM1117-3.3
VIN = 4.75V, 0 IOUT 800mA
LM1117-5.0
VIN = 6.5V, 0 IOUT 800mA
IOUT = 100mA
IOUT = 500mA
IOUT = 800mA
VIN-VOUT = 5V, TJ = 25˚C
LM1117-ADJ
VIN = 15V
LM1117-1.8
VIN 15V
LM1117-2.5
VIN 15V
LM1117-2.85
VIN 10V
LM1117-3.3
VIN 15V
LM1117-5.0
VIN 15V
TA = 25˚C, 30ms Pulse
fRIPPLE =1 20Hz, VIN-VOUT = 3V
VRIPPLE = 1VPP
0.2 0.4 %
1 10 mV
1 10 mV
1 10 mV
1 10 mV
1 15 mV
1.10 1.20 V
1.15 1.25 V
1.20 1.30 V
800
1200
1500
mA
1.7 5 mA
5 10 mA
5 10 mA
5 10 mA
5 10 mA
5 10 mA
0.01 0.1 %/W
60 75
dB
60 120 µA
Adjust Pin Current
Change
Temperature Stability
10 IOUT800mA,
1.4V VIN-VOUT 10V
0.2 5 µA
0.5 %
Long Term Stability
RMS Output Noise
Thermal Resistance
Junction-to-Case
TA = 125˚C, 1000Hrs
(% of VOUT), 10Hz f 10kHz
3-Lead SOT-223
3-Lead TO-220
3-Lead TO-252
0.3
0.003
15.0
3.0
10
%
%
˚C/W
˚C/W
˚C/W
Thermal Resistance
Junction-to-Ambient
(No heat sink;
No air flow)
3-Lead SOT-223
3-Lead TO-220
3-Lead TO-252 (Note 9)
136 ˚C/W
79 ˚C/W
92 ˚C/W
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-
tended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.
Note 2: The maximum power dissipation is a function of TJ(max) , θJA, and TA. The maximum allowable power dissipation at any ambient temperature is
PD = (TJ(max)–TA)/θJA. All numbers apply for packages soldered directly into a PC board.
Note 3: For testing purposes, ESD was applied using human body model, 1.5kin series with 100pF.
Note 4: Typical Values represent the most likely parametric norm.
Note 5: All limits are guaranteed by testing or statistical analysis.
Note 6: Load and line regulation are measured at constant junction room temperature.
5 www.national.com

5 Page





LM1117DTX-2.85 arduino
APPLICATION NOTE (Continued)
The next parameter which must be calculated is the maxi-
mum allowable temperature rise, TR(max):
TR(max)=TJ(max)-TA(max)
where TJ(max) is the maximum allowable junction tempera-
ture (125˚C), and TA(max) is the maximum ambient tem-
perature which will be encountered in the application.
Using the calculated values for TR(max) and PD, the maxi-
mum allowable value for the junction-to-ambient thermal re-
sistance (θJA) can be calculated:
θJA = TR(max)/PD
If the maximum allowable value for θJA is found to be
136˚C/W for SOT-223 package or 79˚C/W for TO-220
package or 92˚C/W for TO-252 package, no heatsink is
needed since the package alone will dissipate enough heat
to satisfy these requirements. If the calculated value for θJA
falls below these limits, a heatsink is required.
As a design aid, Table 1 shows the value of the θJA of SOT-
223 and TO-252 for different heatsink area. The copper pat-
terns that we used to measure these θJAs are shown at the
end of the Application Notes Section. Figure 7 and Figure 8
reflects the same test results as what are in the Table 1
Figure 9 and Figure 10 shows the maximum allowable power
dissipation vs. ambient temperature for the SOT-223 and
TO-252 device. Figures Figure 11 and Figure 12 shows the
maximum allowable power dissipation vs. copper area (in2)
for the SOT-223 and TO-252 devices. Please see AN1028
for power enhancement techniques to be used with SOT-223
and TO-252 packages.
Layout
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
TABLE 1. θJA Different Heatsink Area
Copper Area
Thermal Resistance
Top Side (in2)*
0.0123
Bottom Side (in2)
0
(θJA,˚C/W) SOT-223
136
(θJA,˚C/W) TO-252
103
0.066
0
123
87
0.3 0 84 60
0.53 0 75 54
0.76 0 69 52
1 0 66 47
0 0.2
115
84
0 0.4
98
70
0 0.6
89
63
0 0.8
82
57
0 1 79 57
0.066
0.066
125
89
0.175
0.175
93
72
0.284
0.284
83
61
0.392
0.392
75
55
0.5 0.5
70
53
*Tab of device attached to topside copper
11 www.national.com

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