NCP1086
1.5 A Adjustable and 3.3 V
Fixed Output Linear
Regulator
The NCP1086 linear regulator provides 1.5 A at 3.3 V or adjustable
output voltage. The adjustable output voltage device uses two external
resistors to set the output voltage within a 1.25 V to 5.5 V range.
The regulators is intended for use as post regulator and
microprocessor supply. The fast loop response and low dropout
voltage make this regulator ideal for applications where low voltage
operation and good transient response are important.
The circuit is designed to operate with dropout voltages less than
1.4 V at 1.5 A output current. Device protection includes overcurrent
and thermal shutdown.
This device is pin compatible with LT1086 family of linear
regulators and has lower dropout voltage.
The regulators are available in TO−220−3, surface mount
2
PAK−3, and SOT−223 packages.
D
Features
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TO−220−3
T SUFFIX
CASE 221A
1
Adjustable
Output
Tab = V
OUT
Pin 1. Adj
2. V
OUT
3. V
IN
2
3
D
2
PAK−3
DP SUFFIX
CASE 418AB
3.3 V Fixed
Output
Tab = V
OUT
Pin 1. GND
2. V
OUT
3. V
IN
•
•
•
•
•
Output Current to 1.5 A
Output Accuracy to
±1%
Over Temperature
Dropout Voltage (Typical) 1.05 V @ 1.5 A
Fast Transient Response
Fault Protection Circuitry
♦
Current Limit
♦
Thermal Shutdown
•
Pb−Free Packages are Available
12
3
1
SOT−223
ST SUFFIX
CASE 318E
23
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 10 of this data sheet.
5.0 V
V
IN
NCP1086
Adj
V
OUT
124
W
1.0%
3.3 V
@ 1.5 A
V
IN
NCP1086
GND
V
OUT
3.3 V
@ 1.5 A
10
mF
5.0 V
22
mF
5.0 V
200
W
1.0%
10
mF
5.0 V
22
mF
5.0 V
Figure 1. Application Diagram, Adjustable Output
Figure 2. Application Diagram, 3.3 V Fixed Output
©
Semiconductor Components Industries, LLC, 2009
December, 2009
−
Rev. 9
1
Publication Order Number:
NCP1086/D
NCP1086
MAXIMUM RATINGS*
Parameter
Supply Voltage, V
CC
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Lead Temperature Soldering:
ESD Damage Threshold
Wave Solder (through hole styles only) Note 1
Reflow (SMD styles only) Note 2
Value
7.0
−40
to +70
150
−60
to +150
260 Peak
230 Peak
2.0
Unit
V
°C
°C
°C
°C
kV
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. 10 second maximum.
2. 60 second maximum above 183°C.
ELECTRICAL CHARACTERISTICS
(C
IN
= 10
mF,
C
OUT
= 22
mF
Tantalum, V
OUT
+ V
DROPOUT
< V
IN
< 7.0 V, 0°C
≤
T
A
≤
70°C,
T
J
≤
+150°C, unless otherwise specified, I
full load
= 1.5 A.)
Characteristic
ADJUSTABLE OUTPUT VOLTAGE
Reference Voltage (Notes 3 and 4)
Line Regulation
Load Regulation (Notes 3 and 4)
Dropout Voltage (Note 5)
Current Limit
Minimum Load Current (Note 6)
Adjust Pin Current
Thermal Regulation (Note 7)
Ripple Rejection (Note 7)
Thermal Shutdown (Note 8)
Thermal Shutdown Hysteresis (Note 8)
FIXED OUTPUT VOLTAGE
Output Voltage (Notes 3 and 4)
Line Regulation
Load Regulation (Notes 3 and 4)
Dropout Voltage (Note 5)
Current Limit
Quiescent Current
Thermal Regulation (Note 7)
V
IN
−
V
OUT
= 1.5 V, 0
≤
I
OUT
≤
1.5 A
2.0 V
≤
V
IN
−
V
OUT
≤
3.7 V; I
OUT
= 10 mA
V
IN
−
V
OUT
= 2.0 V; 10 mA
≤
I
OUT
≤
1.5 A
I
OUT
= 1.5 A
V
IN
−
V
OUT
= 3.0 V
I
OUT
= 10 mA
30 ms pulse; T
A
= 25°C
3.25
(−1.5%)
−
−
−
1.6
−
−
3.3
0.02
0.04
1.05
3.1
5.0
0.002
3.35
(+1.5%)
0.2
0.4
1.4
−
10
0.02
V
%
%
V
A
mA
%/W
V
IN
−
V
OUT
= 1.5 V; V
Adj
= 0 V,
10 mA
≤
I
OUT
≤
1.5 A
1.5 V
≤
V
IN
−
V
OUT
≤
5.75 V; I
OUT
= 10 mA
V
IN
−
V
OUT
= 1.5 V; 10 mA
≤
I
OUT
≤
1.5 A
I
OUT
= 1.5 A
V
IN
−
V
OUT
= 3.0 V; T
J
≥
25°C
V
IN
= 7.0 V; V
Adj
= 0
V
IN
−
V
OUT
= 3.0 V; I
OUT
= 10 mA
30 ms pulse; T
A
= 25°C
f = 120 Hz; I
OUT
= 1.5 A; V
IN
−
V
OUT
= 3.0 V;
V
RIPPLE
= 1.0 V
P−P
−
−
1.241
(−1%)
−
−
−
1.6
−
−
−
−
150
−
1.254
0.02
0.04
1.05
3.1
0.6
50
0.002
80
180
25
1.266
(+1%)
0.2
0.4
1.4
−
2.0
100
0.02
−
210
−
V
%
%
V
A
mA
mA
%/W
dB
°C
°C
Test Conditions
Min
Typ
Max
Unit
3. Load regulation and output voltage are measured at a constant junction temperature by low duty cycle pulse testing. Changes in output
voltage due to thermal gradients or temperature changes must be taken into account separately.
4. Specifications apply for an external Kelvin sense connection at a point on the output pin 1/4” from the bottom of the package.
5. Dropout voltage is a measurement of the minimum input/output differential at full load.
6. The minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor divider used to set the
output voltage is selected to meet the minimum requirement.
7. Guaranteed by design, not 100% tested in production.
8. Thermal shutdown is 100% functionally tested in production.
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NCP1086
ELECTRICAL CHARACTERISTICS
(continued)
(C
IN
= 10
mF,
C
OUT
= 22
mF
Tantalum, V
OUT
+ V
DROPOUT
< V
IN
< 7.0 V,
0°C
≤
T
A
≤
70°C, T
J
≤
+150°C, unless otherwise specified, I
full load
= 1.5 A.)
Characteristic
FIXED OUTPUT VOLTAGE
(continued)
Ripple Rejection (Note 9)
Thermal Shutdown (Note 10)
Thermal Shutdown Hysteresis
(Note 10)
9. Guaranteed by design, not 100% tested in production.
10. Thermal shutdown is 100% functionally tested in production.
f = 120 Hz; I
OUT
= 1.5 A; V
IN
−
V
OUT
= 3.0 V;
V
RIPPLE
= 1.0 V
P−P
−
−
−
150
−
80
180
25
−
210
−
dB
°C
°C
Test Conditions
Min
Typ
Max
Unit
PACKAGE PIN DESCRIPTION, ADJUSTABLE OUTPUT
Package Pin Number
D
2
PAK−3
1
2
3
TO−220−3
1
2
3
SOT−223
1
2
3
Pin Symbol
Adj
V
OUT
V
IN
Function
Adjust pin (low side of the internal reference).
Regulated output voltage (case).
Input voltage.
PACKAGE PIN DESCRIPTION, 3.3 V FIXED OUTPUT
Package Pin Number
D
2
PAK−3
1
2
3
TO−220−3
1
2
3
SOT−223
1
2
3
Pin Symbol
GND
V
OUT
V
IN
Ground connection.
Regulated output voltage (case).
Input voltage.
Function
V
OUT
V
IN
V
IN
V
OUT
Output
Current
Limit
Thermal
Shutdown
Bandgap
−
+
Error
Amplifier
Adj
Output
Current
Limit
Thermal
Shutdown
Bandgap
GND
−
+
Error
Amplifier
Figure 3. Block Diagram, Adjustable Output
Figure 4. Block Diagram, 3.3 V Fixed Output
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NCP1086
TYPICAL PERFORMANCE CHARACTERISTICS
1.05
T
CASE
= 0°C
Output Voltage Deviation (%)
1200
1500
1.00
V Drop Out (V)
0.95
0.90
0.85
0.80
0.75
0
T
CASE
= 125°C
300
600
900
I
OUT
(mA)
0.10
0.08
0.04
0.00
−0.04
−0.08
−0.12
0
T
CASE
= 25°C
10 20 30 40 50 60 70 80 90 100 110 120 130
T
J
(°C)
Figure 5. Dropout Voltage vs. Output Current
70
65
I
O
= 10mA
60
55
50
45
40
0
I
SC
(A)
2.7
3.5
3.1
Figure 6. Reference Voltage vs. Temperature
Adjust Pin Current (mA)
2.3
1.9
1.5
1.0
20
40
60
80
Temperature (°C)
100
120
2.0
3.0
4.0
5.0
V
IN
−
V
OUT
(V)
6.0
7.0
Figure 7. Adjust Pin Current vs. Temperature
(Adjustable Output)
Voltage Deviation (mV)
Voltage Deviation (mV)
Figure 8. Short Circuit Current vs V
IN
−
V
OUT
200
100
0
−120
0
−200
1500
750
0
0
1.0
2.0
3.0
4.0
5.0
Time,
ms
6.0
7.0
8.0
9.0
10
V
OUT
= 3.3 V
C
OUT
= C
IN
= 22
mF
Tantalum
200
100
0
−120
0
−200
1500
750
0
0
1.0
2.0
3.0
4.0
5.0
Time,
ms
6.0
7.0
8.0
9.0
10
C
OUT
= C
IN
= 22
mF
Tantalum
Load Step (mA)
Figure 9. Transient Response (Adjustable Output)
Load Step (mA)
4
Figure 10. Transient Response (3.3 V Fixed Output)
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NCP1086
85
75
Ripple Rejection (dB)
65
55
45
35
25
15
10
1
T
CASE
= 25°C
I
OUT
= 6A
(V
IN
−
V
OUT
= 3V)
V
RIPPLE
= 1.6V
PP
C
Adj
= 0.1
mF
10
2
10
3
10
4
Frequency (Hz)
10
5
10
6
Ripple Rejection (dB)
85
75
65
55
45
35
25
15
10
1
T
CASE
= 25°C
I
OUT
= 6A
(V
IN
−
V
OUT
= 3V)
V
RIPPLE
= 1.6V
PP
10
2
10
3
10
4
Frequency (Hz)
10
5
10
6
Figure 11. Ripple Rejection vs. Frequency
(Adjustable Output)
0.100
Output Voltage Deviation, (%)
Minimum Load Current (mA)
0.65
Figure 12. Ripple Rejection vs. Frequency
(3.3 V Fixed Output)
0.075
0.60
0.55
T
CASE
= 0°C
0.050
T
CASE
= 125°C
0.025
T
CASE
= 25°C
0.50
0.45
T
CASE
= 25°C
T
CASE
= 125°C
0
0
T
CASE
= 0°C
1.0
Output Current (A)
2.0
C
IN
= C
OUt
= 22
mF
Tantalum
0.40
1.0
2.0
3.0
4.0
V
IN
−
V
OUT
(V)
5.0
6.0
7.0
Figure 13. Load Regulation vs. Output Current
(Adjustable Output)
Figure 14. Minimum Load Current vs V
IN
−
V
OUT
(Adjustable Output)
APPLICATIONS INFORMATION
The NCP1086 voltage regulator series provides
adjustable and 3.3 V output voltages at currents up to 1.5 A.
The regulator is protected against overcurrent conditions
and includes thermal shutdown.
The NCP1086 series has a composite PNP−NPN output
transistor and requires an output capacitor for stability. A
detailed procedure for selecting this capacitor is included in
the Stability Considerations section.
Adjustable Operation
A resistor divider network R1 and R2 causes a fixed
current to flow to ground. This current creates a voltage
across R2 that adds to the 1.25 V across R1 and sets the
overall output voltage. The adjust pin current (typically
50
mA)
also flows through R2 and adds a small error that
should be taken into account if precise adjustment of V
OUT
is necessary.
The output voltage is set according to the formula:
VOUT
+
VREF
R1
)
R2
)
I
Adj
R1
R2
The adjustable output device has an output voltage range
of 1.25 V to 5.5 V. An external resistor divider sets the
output voltage as shown in Figure 15. The regulator
maintains a fixed 1.25 V (typical) reference between the
output pin and the adjust pin.
The term I
Adj
×
R2 represents the error added by the adjust
pin current.
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