Datasheet LM1117SX-2.85, LM1117S-ADJ, LM1117S-5.0, LM1117S-3.3, LM1117T-ADJ Datasheet (NSC)

...
Page 1
LM1117/LM1117I 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 external 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 as­sure output voltage accuracy to within
±
1%.
The LM1117 series is available in LLP, TO-263, SOT-223, TO-220, and TO-252 D-PAK packages. A minimum of 10µF tantalum capacitor is required at the output to improve the transient response and stability.
Features
n Available in 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable
Versions
n Space Saving SOT-223 and LLP Packages n Current Limiting and Thermal Protection n Output Current 800mA n Line Regulation 0.2% (Max) n Load Regulation 0.4% (Max) n Temperature Range
— LM1117 0˚C to 125˚C — LM1117I −40˚C to 125˚C
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
10091905
Fixed Output Regulator
10091928
October 2002
LM1117/LM1117I 800mA Low-Dropout Linear Regulator
© 2002 National Semiconductor Corporation DS100919 www.national.com
Page 2
Ordering Information
Package Temperature
Range
Part Number Packaging Marking Transport Media NSC
Drawing
3-lead SOT-223
0˚C to +125˚C LM1117MPX-ADJ N03A Tape and Reel MP04A
LM1117MPX-1.8 N12A Tape and Reel
LM1117MPX-2.5 N13A Tape and Reel
LM1117MPX-2.85 N04A Tape and Reel
LM1117MPX-3.3 N05A Tape and Reel
LM1117MPX-5.0 N06A Tape and Reel
−40˚C to +125˚C LM1117IMPX-ADJ N03B Tape and Reel
LM1117IMPX-3.3 N05B Tape and Reel
LM1117IMPX-5.0 N06B Tape and Reel
3-lead TO-220 0˚C to +125˚C LM1117T-ADJ LM1117T-ADJ Rails T03B
LM1117T-1.8 LM1117T-1.8 Rails
LM1117T-2.5 LM1117T-2.5 Rails
LM1117T-2.85 LM1117T-2.85 Rails
LM1117T-3.3 LM1117T-3.3 Rails
LM1117T-5.0 LM1117T-5.0 Rails
3-lead TO-252 0˚C to +125˚C LM1117DTX-ADJ LM1117DT-ADJ Tape and Reel TD03B
LM1117DTX-1.8 LM1117DT-1.8 Tape and Reel
LM1117DTX-2.5 LM1117DT-2.5 Tape and Reel
LM1117DTX-2.85 LM1117DT-2.85 Tape and Reel
LM1117DTX-3.3 LM1117DT-3.3 Tape and Reel
LM1117DTX-5.0 LM1117DT-5.0 Tape and Reel
−40˚C to +125˚C LM1117IDTX-ADJ LM1117IDT-ADJ Tape and Reel
LM1117IDTX-3.3 LM1117IDT-3.3 Tape and Reel
LM1117IDTX-5.0 LM1117IDT-5.0 Tape and Reel
8-lead LLP 0˚C to +125˚C LM1117LDX-ADJ 1117ADJ Tape and Reel LDC08A
LM1117LDX-1.8 1117-18 Tape and Reel
LM1117LDX-2.5 1117-25 Tape and Reel
LM1117LDX-2.85 1117-28 Tape and Reel
LM1117LDX-3.3 1117-33 Tape and Reel
LM1117LDX-5.0 1117-50 Tape and Reel
−40˚C to 125˚C LM1117ILDX-ADJ 1117IAD Tape and Reel
LM1117ILDX-3.3 1117I33 Tape and Reel
LM1117ILDX-5.0 1117I50 Tape and Reel
TO-263 0˚C to +125˚C LM1117SX-ADJ LM1117SADJ Tape and Reel TS3B
LM1117SX-2.85 LM1117S2.85 Tape and Reel
LM1117SX-3.3 LM1117S3.3 Tape and Reel
LM1117SX-5.0 LM1117S5.0 Tape and Reel
LM1117/LM1117I
www.national.com 2
Page 3
Block Diagram
10091901
Connection Diagrams
SOT-223
10091904
Top View
TO-220
10091902
Top View
TO-252
10091938
Top View
TO-263
10091944
Top View
10091945
Side View
LLP
10091946
When using the LLP package
Pins 2,3&4must be connected together and
Pins 5,6&7must be connected together
Top View
LM1117/LM1117I
www.national.com3
Page 4
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
Maximum Input Voltage (V
IN
to GND) 20V
Power Dissipation (Note 2) Internally Limited
Junction Temperature (T
J
)
(Note 2)
150˚C
Storage Temperature Range -65˚C to 150˚C
Lead Temperature
TO-220 (T) Package 260˚C, 10 sec
SOT-223 (IMP) Package 260˚C, 4 sec
ESD Tolerance (Note 3) 2000V
Operating Ratings (Note 1)
Input Voltage (V
IN
to GND) 15V
Junction Temperature Range (T
J
)(Note 2)
LM1117 0˚C to 125˚C
LM1117I −40˚C to 125˚C
LM1117 Electrical Characteristics
Typicals and limits appearing in normal type apply for TJ= 25˚C. Limits appearing in Boldface type apply over the entire junc­tion temperature range for operation, 0˚C to 125˚C.
Symbol Parameter Conditions
Min
(Note 5)
Typ
(Note 4)
Max
(Note 5)
Units
V
REF
Reference Voltage LM1117-ADJ
I
OUT
= 10mA, VIN-V
OUT
= 2V, TJ= 25˚C
10mA I
OUT
800mA, 1.4V VIN-V
OUT
10V
1.238
1.225
1.250
1.250
1.262
1.270
V V
V
OUT
Output Voltage LM1117-1.8
I
OUT
= 10mA, VIN= 3.8V, TJ= 25˚C
0 I
OUT
800mA, 3.2V VIN≤ 10V
1.782
1.746
1.800
1.800
1.818
1.854
V V
LM1117-2.5 I
OUT
= 10mA, VIN= 4.5V, TJ= 25˚C
0 I
OUT
800mA, 3.9V VIN≤ 10V
2.475
2.450
2.500
2.500
2.525
2.550
V V
LM1117-2.85 I
OUT
= 10mA, VIN= 4.85V, TJ= 25˚C
0 I
OUT
800mA, 4.25V VIN≤ 10V
0 I
OUT
500mA, VIN= 4.10V
2.820
2.790
2.790
2.850
2.850
2.850
2.880
2.910
2.910
V V V
LM1117-3.3 I
OUT
= 10mA, VIN=5VTJ= 25˚C
0 I
OUT
800mA, 4.75VVIN≤ 10V
3.267
3.235
3.300
3.300
3.333
3.365
V V
LM1117-5.0 I
OUT
= 10mA, VIN= 7V, TJ= 25˚C
0 I
OUT
800mA, 6.5V VIN≤ 12V
4.950
4.900
5.000
5.000
5.050
5.100
V V
V
OUT
Line Regulation (Note 6)
LM1117-ADJ I
OUT
= 10mA, 1.5V VIN-V
OUT
13.75V 0.035 0.2 %
LM1117-1.8 I
OUT
= 0mA, 3.2V VIN≤ 10V
1 6 mV
LM1117-2.5 I
OUT
= 0mA, 3.9V VIN≤ 10V
1 6 mV
LM1117-2.85 I
OUT
= 0mA, 4.25V VIN≤ 10V 1 6 mV
LM1117-3.3 I
OUT
= 0mA, 4.75V VIN≤ 15V 1 6 mV
LM1117-5.0 I
OUT
= 0mA, 6.5V VIN≤ 15V 1 10 mV
LM1117/LM1117I
www.national.com 4
Page 5
LM1117 Electrical Characteristics (Continued)
Typicals and limits appearing in normal type apply for TJ= 25˚C. Limits appearing in Boldface type apply over the entire junc­tion temperature range for operation, 0˚C to 125˚C.
Symbol Parameter Conditions
Min
(Note 5)
Typ
(Note 4)
Max
(Note 5)
Units
V
OUT
Load Regulation (Note 6)
LM1117-ADJ V
IN-VOUT
= 3V, 10 I
OUT
800mA 0.2 0.4 %
LM1117-1.8 V
IN
= 3.2V, 0 I
OUT
800mA
1 10 mV
LM1117-2.5 VIN= 3.9V, 0 I
OUT
800mA
1 10 mV
LM1117-2.85 V
IN
= 4.25V, 0 I
OUT
800mA 1 10 mV
LM1117-3.3 VIN= 4.75V, 0 I
OUT
800mA 1 10 mV
LM1117-5.0 V
IN
= 6.5V, 0 I
OUT
800mA 1 15 mV
V
IN-VOUT
Dropout Voltage (Note 7)
I
OUT
= 100mA 1.10 1.20 V
I
OUT
= 500mA 1.15 1.25 V
I
OUT
= 800mA 1.20 1.30 V
I
LIMIT
Current Limit VIN-V
OUT
= 5V, TJ= 25˚C 800 1200 1500 mA
Minimum Load Current (Note 8)
LM1117-ADJ V
IN
= 15V 1.7 5 mA
Quiescent Current LM1117-1.8
VIN≤ 15V
5 10 mA
LM1117-2.5 V
IN
15V
5 10 mA
LM1117-2.85 V
IN
10V 5 10 mA
LM1117-3.3 VIN≤ 15V 5 10 mA
LM1117-5.0 V
IN
15V 5 10 mA
Thermal Regulation T
A
= 25˚C, 30ms Pulse 0.01 0.1 %/W
Ripple Regulation f
RIPPLE
=1 20Hz, VIN-V
OUT
=3VV
RIPPLE
=1V
PP
60 75 dB
Adjust Pin Current 60 120 µA
Adjust Pin Current Change
10 I
OUT
800mA,
1.4V V
IN-VOUT
10V 0.2 5 µA
Temperature Stability 0.5 %
Long Term Stability T
A
= 125˚C, 1000Hrs 0.3 %
RMS Output Noise (% of V
OUT
), 10Hz f 10kHz 0.003 %
Thermal Resistance Junction-to-Case
3-Lead SOT-223 15.0 ˚C/W
3-Lead TO-220 3.0 ˚C/W
3-Lead TO-252 10 ˚C/W
Thermal Resistance Junction-to-Ambient (No air flow)
3-Lead SOT-223 (No heat sink) 136 ˚C/W
3-Lead TO-220 (No heat sink) 79 ˚C/W
3-Lead TO-252 (Note 9) (No heat sink) 92 ˚C/W
3-Lead TO-263 55 ˚C/W
8-Lead LLP(Note 10) 40 ˚C/W
LM1117/LM1117I
www.national.com5
Page 6
LM1117I Electrical Characteristics
Typicals and limits appearing in normal type apply for TJ= 25˚C. Limits appearing in Boldface type apply over the entire junc­tion temperature range for operation, −40˚C to 125˚C.
Symbol Parameter Conditions
Min
(Note 5)
Typ
(Note 4)
Max
(Note 5)
Units
V
REF
Reference Voltage LM1117I-ADJ
I
OUT
= 10mA, VIN-V
OUT
= 2V, TJ= 25˚C
10mA I
OUT
800mA, 1.4V VIN-V
OUT
10V
1.238
1.200
1.250
1.250
1.262
1.290
V V
V
OUT
Output Voltage LM1117I-3.3
I
OUT
= 10mA, VIN= 5V, TJ= 25˚C
0 I
OUT
800mA, 4.75V VIN≤ 10V
3.267
3.168
3.300
3.300
3.333
3.432
V V
LM1117I-5.0 I
OUT
= 10mA, VIN= 7V, TJ= 25˚C
0 I
OUT
800mA, 6.5V VIN≤ 12V
4.950
4.800
5.000
5.000
5.050
5.200
V V
V
OUT
Line Regulation (Note 6)
LM1117I-ADJ I
OUT
= 10mA, 1.5V VIN-V
OUT
13.75V 0.035 0.3 %
LM1117I-3.3 I
OUT
= 0mA, 4.75V VIN≤ 15V 1 10 mV
LM1117I-5.0 I
OUT
= 0mA, 6.5V VIN≤ 15V 1 15 mV
V
OUT
Load Regulation (Note 6)
LM1117I-ADJ V
IN-VOUT
= 3V, 10 I
OUT
800mA 0.2 0.5 %
LM1117I-3.3 V
IN
= 4.75V, 0 I
OUT
800mA 1 15 mV
LM1117I-5.0 V
IN
= 6.5V, 0 I
OUT
800mA 1 20 mV
V
IN-VOUT
Dropout Voltage (Note 7)
I
OUT
= 100mA 1.10 1.30 V
I
OUT
= 500mA 1.15 1.35 V
I
OUT
= 800mA 1.20 1.40 V
I
LIMIT
Current Limit VIN-V
OUT
= 5V, TJ= 25˚C 800 1200 1500 mA
Minimum Load Current (Note 8)
LM1117I-ADJ V
IN
= 15V 1.7 5 mA
Quiescent Current LM1117I-3.3
VIN≤ 15V 5 15 mA
LM1117I-5.0 V
IN
15V 5 15 mA
Thermal Regulation T
A
= 25˚C, 30ms Pulse 0.01 0.1 %/W
Ripple Regulation f
RIPPLE
=1 20Hz, VIN-V
OUT
=3VV
RIPPLE
=1V
PP
60 75 dB
Adjust Pin Current 60 120 µA
Adjust Pin Current Change
10 I
OUT
800mA,
1.4V V
IN-VOUT
10V 0.2 10 µA
Temperature Stability 0.5 %
Long Term Stability T
A
= 125˚C, 1000Hrs 0.3 %
RMS Output Noise (% of V
OUT
), 10Hz f 10kHz 0.003 %
Thermal Resistance Junction-to-Case
3-Lead SOT-223 15.0 ˚C/W
3-Lead TO-252 10 ˚C/W
Thermal Resistance Junction-to-Ambient No air flow)
3-Lead SOT-223 (No heat sink) 136 ˚C/W
3-Lead TO-252 (No heat sink)(Note 9) 92 ˚C/W
8-Lead LLP(Note 10) 40 ˚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 intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.
LM1117/LM1117I
www.national.com 6
Page 7
Note 2: The maximum power dissipation is a function of T
J(max)
, θJA, and TA. The maximum allowable power dissipation at any ambient temperature is
P
D
=(T
J(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.
Note 7: The dropout voltage is the input/output differential at which the circuit ceases to regulate against further reduction in input voltage. It is measured when the
output voltage has dropped 100mV from the nominal value obtained at V
IN=VOUT
+1.5V.
Note 8: The minimum output current required to maintain regulation.
Note 9: Minimum pad size of 0.038in
2
Note 10: Thermal Performance for the LLP was obtained using JESD51-7 board with six vias and an ambient temperature of 22˚C. For information about improved thermal performance and power dissipation for the LLP, refer to Application Note AN-1187.
Typical Performance Characteristics
Dropout Voltage (VIN-V
OUT
) Short-Circuit Current
10091922 10091923
Load Regulation LM1117-ADJ Ripple Rejection
10091943
10091906
LM1117/LM1117I
www.national.com7
Page 8
Typical Performance Characteristics (Continued)
LM1117-ADJ Ripple Rejection vs. Current Temperature Stability
10091907
10091925
Adjust Pin Current LM1117-2.85 Load Transient Response
10091926
10091908
LM1117-5.0 Load Transient Response LM1117-2.85 Line Transient Response
10091909 10091910
LM1117/LM1117I
www.national.com 8
Page 9
Typical Performance Characteristics (Continued)
LM1117-5.0 Line Transient Response
10091911
Application Note
1.0 External Capacitors/Stability
1.1 Input Bypass Capacitor
An input capacitor is recommended. A 10µF tantalum on the input is a suitable input bypassing for almost all applications.
1.2 Adjust Terminal Bypass Capacitor
The adjust terminal can be bypassed to ground with a by­pass capacitor (C
ADJ
) to improve ripple rejection. This by­pass capacitor prevents ripple from being amplified as the output voltage is increased. At any ripple frequency, the impedance of the C
ADJ
should be less than R1 to prevent the
ripple from being amplified:
1/(2π*f
RIPPLE*CADJ
)<R1
The R1 is the resistor between the output and the adjust pin. Its value is normally in the range of 100-200. For example, with R1 = 124and f
RIPPLE
= 120Hz, the C
ADJ
should be
>
11µF.
1.3 Output Capacitor
The output capacitor is critical in maintaining regulator sta­bility, and must meet the required conditions for both mini­mum amount of capacitance and ESR (Equivalent Series Resistance). The minimum output capacitance required by the LM1117 is 10µF, if a tantalum capacitor is used. Any increase of the output capacitance will merely improve the loop stability and transient response. The ESR of the output capacitor should range between 0.3-22Ω. In the case of the adjustable regulator, when the C
ADJ
is used, a larger
output capacitance (22µf tantalum) is required.
2.0 Output Voltage
The LM1117 adjustable version develops a 1.25V reference voltage, V
REF
, between the output and the adjust terminal. As shown in Figure 1, this voltage is applied across resistor R1 to generate a constant current I1. The current I
ADJ
from the adjust terminal could introduce error to the output. But since it is very small (60µA) compared with the I1 and very constant with line and load changes, the error can be ig­nored. The constant current I1 then flows through the output set resistor R2 and sets the output voltage to the desired level.
For fixed voltage devices, R1 and R2 are integrated inside the devices.
3.0 Load Regulation
The LM1117 regulates the voltage that appears between its output and ground pins, or between its output and adjust pins. In some cases, line resistances can introduce errors to the voltage across the load. To obtain the best load regula­tion, a few precautions are needed.
Figure 2, shows a typical application using a fixed output regulator. The Rt1 and Rt2 are the line resistances. It is obvious that the V
LOAD
is less than the V
OUT
by the sum of the voltage drops along the line resistances. In this case, the load regulation seen at the R
LOAD
would be degraded from the data sheet specification. To improve this, the load should be tied directly to the output terminal on the positive side and directly tied to the ground terminal on the negative side.
10091917
FIGURE 1. Basic Adjustable Regulator
LM1117/LM1117I
www.national.com9
Page 10
Application Note (Continued)
When the adjustable regulator is used (Figure 3), the best performance is obtained with the positive side of the resistor R1 tied directly to the output terminal of the regulator rather than near the load. This eliminates line drops from appearing effectively in series with the reference and degrading regu­lation. For example, a 5V regulator with 0.05resistance between the regulator and load will have a load regulation due to line resistance of 0.05xI
L
. If R1 (=125) is con-
nected near the load, the effective line resistance will be
0.05(1+R2/R1) or in this case, it is 4 times worse. In addition, the ground side of the resistor R2 can be returned near the ground of the load to provide remote ground sens­ing and improve load regulation.
4.0 Protection Diodes
Under normal operation, the LM1117 regulators do not need any protection diode. With the adjustable device, the internal resistance between the adjust and output terminals limits the current. No diode is needed to divert the current around the regulator even with capacitor on the adjust terminal. The adjust pin can take a transient signal of
±
25V with respect to
the output voltage without damaging the device. When a output capacitor is connected to a regulator and the
input is shorted to ground, the output capacitor will discharge into the output of the regulator. The discharge current de­pends on the value of the capacitor, the output voltage of the regulator, and rate of decrease of V
IN
. In the LM1117 regu­lators, the internal diode between the output and input pins can withstand microsecond surge currents of 10A to 20A.
With an extremely large output capacitor (1000 µF), and with input instantaneously shorted to ground, the regulator could be damaged.
In this case, an external diode is recommended between the output and input pins to protect the regulator, as shown in Figure 4.
5.0 Heatsink Requirements
When an integrated circuit operates with an appreciable current, its junction temperature is elevated. It is important to quantify its thermal limits in order to achieve acceptable performance and reliability. This limit is determined by sum­ming the individual parts consisting of a series of tempera­ture rises from the semiconductor junction to the operating environment. A one-dimensional steady-state model of con­duction heat transfer is demonstrated in Figure 5. The heat generated at the device junction flows through the die to the die attach pad, through the lead frame to the surrounding case material, to the printed circuit board, and eventually to the ambient environment. Below is a list of variables that may affect the thermal resistance and in turn the need for a heatsink.
R
θ
JC (Component
Variables)
RθCA (Application
Variables)
Leadframe Size & Material Mounting Pad Size,
Material, & Location
No. of Conduction Pins Placement of Mounting
Pad
Die Size PCB Size & Material
Die Attach Material Traces Length & Width
Molding Compound Size and Material
Adjacent Heat Sources
Volume of Air
Ambient Temperatue
Shape of Mounting Pad
10091918
FIGURE 2. Typical Application using Fixed Output
Regulator
10091919
FIGURE 3. Best Load Regulation using Adjustable
Output Regulator
10091915
FIGURE 4. Regulator with Protection Diode
LM1117/LM1117I
www.national.com 10
Page 11
Application Note (Continued)
The LM1117 regulators have internal thermal shutdown to protect the device from over-heating. Under all possible operating conditions, the junction temperature of the LM1117 must be within the range of 0˚C to 125˚C. A heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. To deter­mine if a heatsink is needed, the power dissipated by the regulator, P
D
, must be calculated:
I
IN=IL+IG
PD=(VIN-V
OUT)IL+VINIG
Figure 6 shows the voltages and currents which are present in the circuit.
The next parameter which must be calculated is the maxi­mum allowable temperature rise, T
R
(max):
T
R
(max) = TJ(max)-TA(max)
where T
J
(max) is the maximum allowable junction tempera-
ture (125˚C), and T
A
(max) is the maximum ambient tem-
perature which will be encountered in the application. Using the calculated values for T
R
(max) and PD, the maxi­mum allowable value for the junction-to-ambient thermal resistance (θ
JA
) can be calculated:
θ
JA=TR
(max)/P
D
If the maximum allowable value for θJAis 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 θ
JA
falls below these limits, a heatsink is required. As a design aid, Table 1 shows the value of the θ
JA
of SOT-223 and TO-252 for different heatsink area. The copper patterns that we used to measure these θ
JA
s 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 (in
2
) 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.
*
Application Note AN-1187 discusses improved thermal per-
formance and power dissipation for the LLP.
TABLE 1. θ
JA
Different Heatsink Area
Layout Copper Area Thermal Resistance
Top Side (in
2
)* Bottom Side (in2)(θJA,˚C/W) SOT-223 (θJA,˚C/W) TO-252
1 0.0123 0 136 103
2 0.066 0 123 87
3 0.3 0 84 60
4 0.53 0 75 54
5 0.76 0 69 52
61066 47
7 0 0.2 115 84
8 0 0.4 98 70
9 0 0.6 89 63
10 0 0.8 82 57
11 0 1 79 57
12 0.066 0.066 125 89
10091937
FIGURE 5. Cross-sectional view of Integrated Circuit
Mounted on a printed circuit board. Note that the case
temperature is measured at the point where the leads
contact with the mounting pad surface
10091916
FIGURE 6. Power Dissipation Diagram
LM1117/LM1117I
www.national.com11
Page 12
Application Note (Continued)
TABLE 1. θ
JA
Different Heatsink Area (Continued)
Layout Copper Area Thermal Resistance
13 0.175 0.175 93 72
14 0.284 0.284 83 61
15 0.392 0.392 75 55
16 0.5 0.5 70 53
*Tab of device attached to topside copper
LM1117/LM1117I
www.national.com 12
Page 13
Application Note (Continued)
10091913
FIGURE 7. θJAvs. 1oz Copper Area for SOT-223
10091934
FIGURE 8. θJAvs. 2oz Copper Area for TO-252
10091912
FIGURE 9. Maximum Allowable Power Dissipation vs.
Ambient Temperature for SOT-223
10091936
FIGURE 10. Maximum Allowable Power Dissipation vs.
Ambient Temperature for TO-252
10091914
FIGURE 11. Maximum Allowable Power Dissipation vs.
1oz Copper Area for SOT-223
10091935
FIGURE 12. Maximum Allowable Power Dissipation vs.
2oz Copper Area for TO-252
LM1117/LM1117I
www.national.com13
Page 14
Application Note (Continued)
10091941
FIGURE 13. Top View of the Thermal Test Pattern in Actual Scale
LM1117/LM1117I
www.national.com 14
Page 15
Application Note (Continued)
10091942
FIGURE 14. Bottom View of the Thermal Test Pattern in Actual Scale
LM1117/LM1117I
www.national.com15
Page 16
Typical Application Circuits
10091930
Adjusting Output of Fixed Regulators
10091931
Regulator with Reference
10091929
1.25V to 10V Adjustable Regulator with Improved Ripple Rejection
10091927
5V Logic Regulator with Electronic Shutdown*
LM1117/LM1117I
www.national.com 16
Page 17
Typical Application Circuits (Continued)
10091932
Battery Backed-Up Regulated Supply
10091933
Low Dropout Negative Supply
LM1117/LM1117I
www.national.com17
Page 18
Physical Dimensions inches (millimeters)
unless otherwise noted
3-Lead SOT-223
NS Package Number MP04A
LM1117/LM1117I
www.national.com 18
Page 19
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
3-Lead TO-220
NS Package Number T03B
LM1117/LM1117I
www.national.com19
Page 20
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
3-Lead TO-263
NS Package Number TS3B
LM1117/LM1117I
www.national.com 20
Page 21
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
3-Lead TO-252
NS Package Number TD03B
8-Lead LLP
NS Package Number LDC08A
LM1117/LM1117I
www.national.com21
Page 22
Notes
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. 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 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 to the user.
2. A critical component is 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.
National Semiconductor Corporation
Americas Email: support@nsc.com
National Semiconductor Europe
Fax: +49 (0) 180-530 85 86
Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790
National Semiconductor Asia Pacific Customer Response Group
Tel: 65-2544466 Fax: 65-2504466 Email: ap.support@nsc.com
National Semiconductor Japan Ltd.
Tel: 81-3-5639-7560 Fax: 81-3-5639-7507
www.national.com
LM1117/LM1117I 800mA Low-Dropout Linear Regulator
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
Loading...