ON Semiconductor NCP1086 Technical data

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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

D

PAK−3, and SOT−223 packages.

Features

• Output Current to 1.5 A

• Output Accuracy to ±1% Over T emperature

• Dropout Voltage (Typical) 1.05 V @ 1.5 A

• Fast Transient Response

• Fault Protection Circuitry

♦ Current Limit
♦ Thermal Shutdown

• Pb−Free Packages are Available

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TO−220−3

T SUFFIX

CASE 221A

1

2

3

D2PAK−3

DP SUFFIX

1

2

3

1

2

3

CASE 418AB

SOT−223

ST SUFFIX

CASE 318E

Adjustable

Output

Tab = V

OUT

Pin 1. Adj

2. V

OUT

3. V

IN

3.3 V Fixed
Output

Tab = V

OUT

Pin 1. GND

2. V

OUT

3. V

IN

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

10 mF

5.0 V

V

IN

NCP1086

Adj

V

OUT

124 W

1.0%

200 W

1.0%

3.3 V
@ 1.5 A

22 mF

5.0 V
10 mF

5.0 V

V

IN

NCP1086

GND

V

OUT

22 mF

5.0 V

Figure 1. Application Diagram, Adjustable Output Figure 2. Application Diagram, 3.3 V Fixed Output

© Semiconductor Components Industries, LLC, 2005

May, 2005 − Rev. 6

1 Publication Order Number:

NCP1086/D

3.3 V
@ 1.5 A

MAXIMUM RATINGS*

NCP1086

Parameter Value Unit

Supply Voltage, V

CC

7.0 V
Operating Temperature Range −40 to +70 °C
Junction Temperature 150 °C
Storage Temperature Range −60 to +150 °C
Lead Temperature Soldering: Wave Solder (through hole styles only) Note 1

Reflow (SMD styles only) Note 2

260 Peak
230 Peak

°C

ESD Damage Threshold 2.0 kV

Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously . If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.

1. 10 second maximum.

2. 60 second maximum above 183°C.

ELECTRICAL CHARACTERISTICS (C

T

≤ +150°C, unless otherwise specified, I

J

Characteristic

IN

full load

= 10 mF, C

= 1.5 A.)

= 22 mF Tantalum, V

OUT

OUT

+ V

DROPOUT

< VIN < 7.0 V, 0°C ≤ TA ≤ 70°C,

Test Conditions Min Typ Max Unit

ADJUSTABLE OUTPUT VOLTAGE

Reference Voltage (Notes 3 and 4)

Line Regulation 1.5 V ≤ VIN − V
Load Regulation (Notes 3 and 4) VIN − V
Dropout Voltage (Note 5) I
Current Limit VIN − V
Minimum Load Current (Note 6) VIN = 7.0 V; V
Adjust Pin Current VIN − V

VIN − V
10 mA ≤ I

OUT

= 1.5 V; V

OUT

≤ 1.5 A

OUT

OUT

= 1.5 V; 10 mA ≤ I

OUT

= 0 V,

Adj

≤ 5.75 V; I

1.241

(−1%)

= 10 mA − 0.02 0.2 %

OUT

≤ 1.5 A − 0.04 0.4 %

OUT

1.254 1.266
(+1%)

= 1.5 A − 1.05 1.4 V

= 3.0 V; TJ ≥ 25°C 1.6 3.1 − A

OUT

= 0 − 0.6 2.0 mA

Adj

OUT

= 3.0 V; I

= 10 mA − 50 100

OUT

V

mA
Thermal Regulation (Note 7) 30 ms pulse; TA = 25°C − 0.002 0.02 %/W
Ripple Rejection (Note 7) f = 120 Hz; I

V

RIPPLE

OUT

= 1.0 V

= 1.5 A; VIN − V

P−P

OUT

= 3.0 V;

− 80 − dB

Thermal Shutdown (Note 8) − 150 180 210 °C
Thermal Shutdown Hysteresis (Note 8) − − 25 − °C

FIXED OUTPUT VOLTAGE

Output Voltage (Notes 3 and 4) VIN − V

Line Regulation 2.0 V ≤ VIN − V
Load Regulation (Notes 3 and 4) VIN − V
Dropout Voltage (Note 5) I

OUT

Current Limit VIN − V
Quiescent Current I

OUT

= 1.5 V, 0 ≤ I

OUT

≤ 3.7 V; I

OUT

= 2.0 V; 10 mA ≤ I

OUT

≤ 1.5 A 3.25

OUT

3.3 3.35

(−1.5%)

= 10 mA − 0.02 0.2 %

OUT

≤ 1.5 A − 0.04 0.4 %

OUT

V

(+1.5%)

= 1.5 A − 1.05 1.4 V

= 3.0 V 1.6 3.1 − A

OUT

= 10 mA − 5.0 10 mA

Thermal Regulation (Note 7) 30 ms pulse; TA = 25°C − 0.002 0.02 %/W

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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2

NCP1086

ELECTRICAL CHARACTERISTICS (continued) (C

0°C ≤ T

≤ 70°C, TJ ≤ +150°C, unless otherwise specified, I

A

Characteristic

= 10 mF, C

IN

full load

= 22 mF Tantalum, V

OUT

= 1.5 A.)

OUT

+ V

DROPOUT

< VIN < 7.0 V,

Test Conditions Min Typ Max Unit

FIXED OUTPUT VOLTAGE (continued)

Ripple Rejection (Note 9)

f = 120 Hz; I
V

RIPPLE

OUT

= 1.0 V

= 1.5 A; VIN − V

P−P

OUT

= 3.0 V;

− 80 − dB

Thermal Shutdown (Note 10) − 150 180 210 °C
Thermal Shutdown Hysteresis

− − 25 − °C

(Note 10)

9. Guaranteed by design, not 100% tested in production.

10.Thermal shutdown is 100% functionally tested in production.

PACKAGE PIN DESCRIPTION, ADJUSTABLE OUTPUT

Package Pin Number

D2PAK−3 TO−220−3 SOT−223

Pin Symbol Function

1 1 1 Adj Adjust pin (low side of the internal reference).
2 2 2 V
3 3 3 V

OUT

IN

Regulated output voltage (case).
Input voltage.

PACKAGE PIN DESCRIPTION, 3.3 V FIXED OUTPUT

Package Pin Number

D2PAK−3 TO−220−3 SOT−223

Pin Symbol Function

1 1 1 GND Ground connection.
2 2 2 V
3 3 3 V

V

IN

Output

Current

OUT

IN

V

OUT

Regulated output voltage (case).
Input voltage.

V

IN

Output

Current

Limit

Thermal

Shutdown

Bandgap

+−

Error
Amplifier

Adj

Thermal

Shutdown

Bandgap

+−

Error
Amplifier

Figure 3. Block Diagram, Adjustable Output Figure 4. Block Diagram, 3.3 V Fixed Output

Limit

V

OUT

GND

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3

0.10

0

V Drop Out (V)

1.00

1.05

.0

t)

Load Step (mA)

Voltage Deviation (mV)

0

0.95

T

CASE

NCP1086

TYPICAL PERFORMANCE CHARACTERISTICS

= 0°C

0.08

0.04

0.90
T

CASE

= 25°C

0.85

0.80

0.75

0 300

T

= 125°C

CASE

600 900 1200 1500

(mA)

I

OUT

Figure 5. Dropout Voltage vs. Output Current

70

65

IO = 10mA

60

55

50

Adjust Pin Current (mA)

45

40

0

20 40 60 80 100 120

Temperature (°C)

Figure 7. Adjust Pin Current vs. Temperature

(Adjustable Output)

0.00

−0.04

−0.08

Output Voltage Deviation (%)

−0.12
0

10 20 30 40 50 60 70 80 90 100 110 120 13

(°C)

T

J

Figure 6. Reference Voltage vs. Temperature

3.5

3.1

2.7

(A)

SC

I

2.3

1.9

1.5

1.0 2.0 3.0 5.0 6.0
VIN − V

4.0

OUT

(V)

Figure 8. Short Circuit Current vs VIN − V

7

OUT

200

100

−120

−200
1500

750

200

100

0

V

= 3.3 V

OUT

C

0

= CIN = 22 mF Tantalum

OUT

0

−120

Voltage Deviation (mV)

0

−200

C

= CIN = 22 mF Tantalum

OUT

1500

750

0

0 1.0 2.0 4.0 5.0 6.0 7.0 8.0 9.0 10

3.0
Time, ms

0

0 1.0 2.0 4.0 5.0 6.0 7.0 8.0 9.0 1

Load Step (mA)

3.0
Time, ms

Figure 9. Transient Response (Adjustable Output) Figure 10. Transient Response (3.3 V Fixed Outpu

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4

NCP1086

Output Voltage Deviation, (%)

.0

Ripple Rejection (dB)

85

85

6

75

65

55

45

T

= 25°C

CASE

I

= 6A

OUT

35

25

15

10

1

(V

IN

V

RIPPLE

C

Adj

− V

OUT

= 1.6V

= 0.1 mF

2

10

= 3V)

PP

10
Frequency (Hz)

3

10

4

10

Figure 11. Ripple Rejection vs. Frequency

(Adjustable Output)

0.100

0.075

0.050

0.025

T

CASE

0

0

1.0 2.0

Output Current (A)

= 25°C

T

CASE

= 125°C

Figure 13. Load Regulation vs. Output Current

(Adjustable Output)

5

T

CASE

10

= 0°C

75

65

55

45

T

= 25°C

CASE

I

= 6A

OUT

35

Ripple Rejection (dB)

25

6

15

10

1

(V

IN

V

RIPPLE

− V

OUT

= 1.6V

2

10

= 3V)

PP

10

Frequency (Hz)

3

10

4

10

5

10

Figure 12. Ripple Rejection vs. Frequency

(3.3 V Fixed Output)

0.65

0.60

0.55

0.50

0.45

Minimum Load Current (mA)

0.40

1.0 2.0 3.0 5.0 6.0 7

Figure 14. Minimum Load Current vs V

T

CASE

T

CASE

CIN = C

VIN − V

= 0°C

= 25°C

= 22 mF Tantalum

OUt

4.0
(V)

OUT

T

CASE

= 125°C

− V

IN

OUT

(Adjustable Output)

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

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.

APPLICATIONS INFORMATION

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
is necessary.

The output voltage is set according to the formula:

V

OUT

The term I

Adj

pin current.

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5

OUT

R1 ) R2

+ V

REF

ǒ

R1

Ǔ

) I

R2

Adj

× R2 represents the error added by the adjust