LM1117MPX-5.0/NOPB National Semiconductor, LM1117MPX-5.0/NOPB Datasheet - Page 9
![IC REG LDO 800MA 5.0V SOT-223](/photos/12/65/126577/pkg_mp04a_sml.jpg)
LM1117MPX-5.0/NOPB
Manufacturer Part Number
LM1117MPX-5.0/NOPB
Description
IC REG LDO 800MA 5.0V SOT-223
Manufacturer
National Semiconductor
Datasheet
1.LM1117MPX-5.0NOPB.pdf
(21 pages)
Specifications of LM1117MPX-5.0/NOPB
Regulator Topology
Positive Fixed
Voltage - Output
5V
Voltage - Input
Up to 15V
Voltage - Dropout (typical)
1.2V @ 800mA
Number Of Regulators
1
Current - Output
800mA
Current - Limit (min)
800mA
Operating Temperature
0°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
SOT-223 (3 leads + Tab), SC-73, TO-261
Voltage Regulator Type
Linear
Topology
LDO
Regulator Output Type
Fixed
Polarity Type
Positive
Number Of Outputs
Single
Input Voltage (max)
15V
Output Voltage
5V
Package Type
SOT-223
Output Current
1.5A
Load Regulation
1mV
Line Regulation
1mV
Output Voltage Accuracy
±1%
Operating Temp Range
0C to 125C
Operating Temperature Classification
Commercial
Dropout Voltage@current (max)
1.2@100mA/1.25@500mA
Dropout Voltage@current (typ)
1.1@100mA/1.15@500mA
Pin Count
3 +Tab
Mounting
Surface Mount
Quiescent Current (max)
10mA
Leaded Process Compatible
Yes
Rohs Compliant
Yes
Peak Reflow Compatible (260 C)
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
*LM1117MPX-5.0
LM1117MPX-5.0
LM1117MPX-5.0
LM1117MPX-5.0TR
LM1117MPX-5.0
LM1117MPX-5.0
LM1117MPX-5.0TR
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Manufacturer
Quantity
Price
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Quantity:
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Typical Performance Characteristics
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 by-
pass capacitor (C
pass capacitor prevents ripple from being amplified as the
output voltage is increased. At any ripple frequency, the
impedance of the C
ripple from being amplified:
The R1 is the resistor between the output and the adjust pin.
Its value is normally in the range of 100-200Ω. For example,
with R1 = 124Ω and f
11µF.
1.3 Output Capacitor
The output capacitor is critical in maintaining regulator sta-
bility, and must meet the required conditions for both mini-
mum 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 0.3Ω - 22Ω. In the case of
the adjustable regulator, when the C
output capacitance (22µf tantalum) is required.
2.0 OUTPUT VOLTAGE
The LM1117 adjustable version develops a 1.25V reference
voltage, V
As shown in Figure 1, this voltage is applied across resistor
R1 to generate a constant current I1. The current I
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 ig-
1/(2π*f
RIPPLE
REF
LM1117-5.0 Line Transient Response
, between the output and the adjust terminal.
*C
ADJ
ADJ
ADJ
)
RIPPLE
) to improve ripple rejection. This by-
<
should be less than R1 to prevent the
R1
= 120Hz, the C
ADJ
is used, a larger
ADJ
should be
10091911
ADJ
from
>
9
(Continued)
nored. 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 regula-
tion, 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
the voltage drops along the line resistances. In this case, the
load regulation seen at the R
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.
FIGURE 1. Basic Adjustable Regulator
LOAD
is less than the V
LOAD
would be degraded from
OUT
by the sum of
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