LM1086ISX-ADJ/NOPB National Semiconductor, LM1086ISX-ADJ/NOPB Datasheet - Page 8

• Manufacturer Part Number: LM1086ISX-ADJ/NOPB
• Description: IC REG POS ADJ 1.5A LDO TO-263
• Manufacturer: National Semiconductor

Specifications of LM1086ISX-ADJ/NOPB

• Regulator Topology: Positive Adjustable
• Voltage - Output: Adjustable
• Voltage - Dropout (typical): 1.3V @ 1.5A
• Number Of Regulators: 1
• Current - Output: 1.5A
• Current - Limit (min): 1.5A
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: TO-263-3, D²Pak (3 leads + Tab), TO-263AA
• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 30 V
• Output Voltage: 1.8 V, 2.5 V, 2.85 V, 3.3 V, 3.45 V, 5 V
• Output Type: Adjustable
• Dropout Voltage (max): 1.5 V At 1.5 A
• Output Current: 1.5 A
• Line Regulation: 0.2 %
• Load Regulation: 0.3 %
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Reference Voltage: 1.262 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -
• Lead Free Status / Rohs Status: Details
• Other names: *LM1086ISX-ADJ; *LM1086ISX-ADJ/NOPB; LM1086ISX-ADJ

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Typical Performance Characteristics
Application Note
GENERAL
Figure 1 shows a basic functional diagram for the LM1086-
Adj (excluding protection circuitry) . The topology is basically
that of the LM317 except for the pass transistor. Instead of a
Darlingtion NPN with its two diode voltage drop, the LM1086
uses a single NPN. This results in a lower dropout voltage.
The structure of the pass transistor is also known as a quasi
LDO. The advantage a quasi LDO over a PNP LDO is its
inherently lower quiescent current. The LM1086 is guaran-
teed to provide a minimum dropout voltage 1.5V over tem-
perature, at full load.
OUTPUT VOLTAGE
The LM1086 adjustable version develops at 1.25V reference
voltage, (V
As shown in figure 2, this voltage is applied across resistor
R1 to generate a constant current I1. This constant current
then flows through R2. The resulting voltage drop across R2
adds to the reference voltage to sets the desired output
voltage.
The current I
output error . But since it is small (120uA max), it becomes
negligible when R1 is in the 100Ω range.
FIGURE 1. Basic Functional Diagram for the LM1086,
REF
ADJ
excluding Protection circuitry
), between the output and the adjust terminal.
from the adjustment terminal introduces an
Line Transient Response
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8
(Continued)
For fixed voltage devices, R1 and R2 are integrated inside
the devices.
STABILITY CONSIDERATION
Stability consideration primarily concern the phase response
of the feedback loop. In order for stable operation, the loop
must maintain negative feedback. The LM1086 requires a
certain amount series resistance with capacitive loads. This
series resistance introduces a zero within the loop to in-
crease phase margin and thus increase stability. The equiva-
lent series resistance (ESR) of solid tantalum or aluminum
electrolytic capacitors is used to provide the appropriate zero
(approximately 500 kHz).
The Aluminum electrolytic are less expensive than tantal-
ums, but their ESR varies exponentially at cold tempera-
tures; therefore requiring close examination when choosing
the desired transient response over temperature. Tantalums
are a convenient choice because their ESR varies less than
2:1 over temperature.
The recommended load/decoupling capacitance is a 10uF
tantalum or a 50uF aluminum. These values will assure
stability for the majority of applications.
The adjustable versions allows an additional capacitor to be
used at the ADJ pin to increase ripple rejection. If this is done
the output capacitor should be increased to 22uF for tantal-
ums or to 150uF for aluminum.
FIGURE 2. Basic Adjustable Regulator
Load Transient Response
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