LM3411AM5-5.0 National Semiconductor, LM3411AM5-5.0 Datasheet - Page 11

• Manufacturer Part Number: LM3411AM5-5.0
• Description: IC REG/DRIVER SECONDARY SOT23-5
• Manufacturer: National Semiconductor

Specifications of LM3411AM5-5.0

• Reference Type: Shunt
• Voltage - Output: 5V
• Tolerance: ±0.5%
• Number Of Channels: 1
• Current - Cathode: 110µA
• Current - Output: 15mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SC-74A, SOT-753
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Input: -
• Temperature Coefficient: -
• Current - Quiescent: -
• Other names: LM3411AM5-5.0TR

Applications Information
The circuit in Figure 8 shows a 3.3V low dropout regulator
using the LM3411-3.3 and several discrete components.
This circuit is capable of excellent performance with both the
dropout voltage and the ground pin current specifications
improved over the LM2941/LM3411 circuit.
Like the positive regulators, the performance of negative
adjustable regulators can also be improved by adding the
LM3411. Output voltages of either 3.3V or 5V at currents up
FIGURE 8. 3.3V 0.5A Low Dropout Regulator
FIGURE 9. Precision Positive Voltage Regulator with Accurate Current Limit
FIGURE 7. Precision 5V 1A Low Dropout Regulator
(Continued)
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The standard LM317 three terminal adjustable regulator cir-
cuit can greatly benefit by adding a LM3411. Performance is
increased and features are added. The circuit shown in
Figure 9 provides much improved line and load regulation,
lower temperature drift, and full remote output voltage sens-
ing on both the high and low side. In addition, a precise
current limit or constant current feature is simple to add.
Current limit protection in most IC regulators is mainly to
protect the IC from gross over-current conditions which
could otherwise fuse bonding wires or blow IC metalization,
therefore not much precision is needed for the actual current
limit values. Current limit tolerances can sometimes vary
from
temperature variations. Often critical circuitry requires a
much tighter control over the amount of current the power
supply can deliver. For example, a power supply may be
needed that can deliver 100% of its design current, but can
still limit the maximum current to 110% to protect critical
circuitry from high current fault conditions.
The circuit in Figure 9 can provide a current limit accuracy
that is better than
tion to having excellent line, load and temperature
specifications.
to 1.5A (3A when using a LM333) are possible. Adding two
resistors to the circuit in Figure 10 adds the precision current
±
10% to as high as +300% over manufacturing and
±
4%, over all possible variations, in addi-
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