1.5A L.D.O. VOLTAGE REGULATOR (Adjustable & Fixed)
FEATURES
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Output Current of 1.5A
Fast Transient Response
0.04% Line Regulation
0.2% Load Regulation
Internal Thermal and Current Limiting
Adjustable or Fixed Output Voltage(1.5V, 1.8V, 2.5V, 3.3V, 5.0V)
Surface Mount Package TO252-3LD & TO-263-3LD
100% Thermal Limit Burn-in
Low Dropout Voltage 1.5V at 1.5A Output Current
Moisture Sensitivity Level 3
LM1086
TO-263 PKG
1
3
TO-252 PKG
APPLICATIONS
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Battery Charger
Adjustable Power Supplies
Constant Current Regulators
Portable Instrumentation
High Efficiency Linear Power Supplies
High Efficiency "Green" Computer Systems
SMPS Post-Regulator
Power PC Supplies
Powering VGA & Sound Card
1
3
1. Adj/Gnd
2. Output
3. Input
ORDERING INFORMATION
Device Name
LM1086R-XX
LM1086RS-XX
Adjustable)
Package
TO263-3LD
TO252-3LD
(XX=Vout=1.5V, 1.8V, 2.5V, 3.3V, 5.0V,
DESCRIPTION
The LM1086 is a low dropout three terminal regulators with 1.5A output current capability.
The output voltage is adjustable with the use of a resistor divider. Dropout is guaranteed at a maximum
of 500 mV at maximum output current.
It's low dropout voltage and fast transient response make it ideal for low voltage microprocessor
applications. Internal current and thermal limiting provides protection against any overload condition
that would create excessive junction temperature.
TEST & TYPICAL APPLICATION CIRCUIT
LM1086
3.3V
LM1086
ADJ
Note
(1) C1 Needed if device is far away from filter capacitors.
(2) C2 minimum value required for stability
V
REF
=V
OUT
-V
ADJ
=1.25V(Typ.)
V
OUT
=V
REF
x(1+RF2/RF1)+I
ADJ
xRF2
I
ADJ
=55㎂(Typ.)
Apr. 2009 - Rev1.1
HTC
-1 -
1.5A L.D.O. VOLTAGE REGULATOR (Adjustable & Fixed)
BLOCK DIAGRAM
LM1086
ABSOULTE MAXIMUM RATINS
CHARACTERISTIC
Supply Voltage
Operating Junction Temperature Range
Storage Temperature Range
Thermal Resistance Junction to Case TO-263
Thermal Resistance Junction to Ambient TO-263
Lead Temperature (Soldering) 10 sec.
Maximum Output Current
SYMBOL
Vin
Topr
Tstg
Tjc
Tja
Tsol
Imax
VALUE
12
0 ~ 125
-65~150
3
60
300
1.5
UNIT
V
℃
℃
C/W
C/W
℃
A
HTC
-2-
1.5A L.D.O. VOLTAGE REGULATOR (Adjustable & Fixed)
ELECTRICAL CHARACTERISTICS I
PARAMETER
1.5V Version
Output Voltage
1.8V Version
Output Voltage
2.5V Version
Output Voltage
3.3V Version
Output Voltage
5.0V Version
Output Voltage
All Voltage Options
V
IN
≤7V,P≤P
MAX
Reference Voltage (V
REF
)
1.5V≤(V
IN- OUT
)≤5.75V, 10㎃≤I
OUT
≤1.5A
V
Min. Load Current(Note 3)
Line Regulation (ΔV
REF
(V
IN
))
Load Regulation (ΔV
REF
(V
OUT
))
Dropout Voltage
Current Limit
I
OUT
(MAX)
Long Term Stability
Thermal Regulation
T
A
=25℃, 30㎳ pulse
(ΔV
OUT
(Pwr))
Output Noise, RMS
10Hz to 10Khz T
A
=25℃
Junction to Tab
Thermal Resistance
Junction to Ambient
0.003
0.01
1.5V≤(V
IN- OUT
)≤5.75V
V
2.75V≤V
IN
≤7V, I
OUT
=10㎃, T
J
=25℃
10㎃≤I
OUT
≤1.5A,(V
IN
-V
OUT
)=3V,T
J
=25℃
ΔV
REF
=1% , Iout=1.5A
Vin-Vout=3V
1.7
1.4V≤(V
IN
-V
OUT
) Adjustable Only
T
A
=125℃, 1000Hrs
0.3
2.5
1.225
1.25
5
0.005
0.05
1.3
1.225
1.25
0≤I
OUT
≤1.5A, 5.5V≤V
IN
4.95
5
0<I
OUT
<1.5A, 4.75V<V
IN
3.27
3.3
0<I
OUT
<1.5A, 3.5V<V
IN
2.475
2.5
0<I
OUT
<1.5A, 3.0V<V
IN
1.78
1.8
0<I
OUT
<1.5A, 2.75V<V
IN
1.485
1.5
OUT
=100㎃,
LM1086
T
A
=25℃, unless otherwise specified
MIN
TYP
MAX
UNIT
TEST CONDITIONS
1.515
V
1.82
V
2.525
V
3.33
V
5.05
V
1.27
V
1.27
10
0.2
0.3
1.5
mA
%
%
V
A
1
%
0.02
%/W
%/Vo
3
℃/W
60
HTC
-3-
1.5A L.D.O. VOLTAGE REGULATOR (Adjustable & Fixed)
TYPICAL PERFORMANCE CHARACTERISTICS
LM1086
Figure 1. Dropout Voltage vs Output Current
Figure 2. Reference Voltage vs Temperature
Figure 3. Load Regulation vs. Output Current
Figure 4. Minimum Load Current
Figure 5. Adjust Pin Current vs Temperature
Figure 6. Ripple Rejection vs. Frequency
(Fixed Versions)
HTC
-4-
1.5A L.D.O. VOLTAGE REGULATOR (Adjustable & Fixed)
LM1086
Figure 9. Ripple Rejection vs. Frequency (Adjustable Versions)
APPLICATIONS INFORMATION
LM1086-ADJ
Figure 10. Resistor Divider Scheme for the Adjustable Version
LM1086-XX
Figure 11. Protection Diode Scheme for Fixed Output Regulators
HTC
-5-
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