Datasheet SPX1086 Datasheet (Sipex)

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SPX1086

1.5A Low Dropout Voltage Regulator
Adjustable & Fixed Output,

Fast Response

FEATURES

Adjustable Output Down To 1.2V

•

Fixed Output Voltages 1.5, 2.5, 3.3, 5.0V

•

Output Current of 1.5A

•

Low Dropout Voltage 1.1V Typ.

•

Extremely Tight Load And Line Regulation

•

Current & Thermal Limiting

•

Standard 3-Terminal Low Cost TO-220, TO-263 & TO-252

•

Similar To Industry Standard LT1086/LT1586

•

PRODUCT DESCRIPTION

The SPX1086 is a low power 1.5A adjustable and fixed voltage regulators that are very easy to use. It requires only 2 external
resistors to set the output voltage for adjustable version. The SPX1086 is designed for low voltage applications that offer lower
dropout voltage and faster transient response. This device is an excellent choice for use in powering low voltage microprocessor that
require a lower dropout, faster transient response to regulate from +2.5V to 3.8V supplies and as a post regulator for switching
supplies applications. The SPX1086 features low dropout of a maximum 1.2 volts.

The SPX1086 offers full protection against over-current faults, reversed input polarity, reversed load insertion, and positive and
negative transient voltage. On-Chip trimming adjusts the reference voltage to 1%. The I
increases efficiency.

The SPX1086 are offered in a 3-pin TO-220, TO-263 & TO-252 packages compatible with other 3 terminal regulators. For a 3A low
dropout regulator refer to the SPX1587 data sheet.

PIN CONNECTIONS

APPLICATIONS

Powering VGA & Sound Card

•

Power PC Supplies

•

SMPS Post-Regulator

•

High Efficiency “Green” Computer Systems

•

High Efficiency Linear Power Supplies

•

Portable Instrumentation

•

Constant Current Regulators

•

Adjustable Power Supplies

•

Battery charger

•

of this device flows into load which

Q

TO-263-3 (T)

ADJ/GND

SPX1086

1

2

V

OUT

Top View

3

V

IN

TO-252 (R)

SPX1086

2

1

ADJ/GND V

Front View

TO-220-3 (U)

3

INVOUT

ADJ/GND

Front View

SPX1086

1

23

V

OUT

V

IN

Rev. 11/2/00

SPX1086

ABSOLUTE MAXIMUM RATINGS

Lead Temp. (Soldering, 10 Seconds) .............................. 300°C Input Voltage........................................................ 30V

Storage Temperature Range ............................ -65° to +150°C Input to Output Voltage Differential .................... 30V

Operating Junction Temperature Range ......................

SPX1086 Control Section.......................... -45°C +125°C

SPX1086 Power Transistor.........................-45°C +150°C

ELECTRICAL CHARACTERISTICS

PARAMETER

1.5V Version

Output Voltage (Note 2)

2.5V Version

Output Voltage (Note 2)

3.3V Version

Output Voltage (Note 2)

5.0V Version

Output Voltage (Note 2)

All Voltage Options

Reference Voltage (V

Min. Load Current

Line Regulation (∆V

Load Regulation(∆V

Dropout Voltage

Current Limit
I

Long Term Stability

Thermal Regulation
(∆V
Temperature Stability
(∆V
Output Noise, RMS

Thermal Resistance

OUT(MAX

OUT

OUT

REF

(Note 3)

REF(VIN

REF(IOUT

)

(Pwr))

(T))

SPX1086-1.5V, 0 ≤I

SPX1086-2.5V,0 ≤I

SPX1086-3.3V, 0 ≤I

SPX1086-5.0V, 0 ≤I

V

)

))

≤

IN

1.5V≤ (V

1.5V≤ (V

2.75V≤V

V

≤

IN

10mA≤I

))

(Note 3)

0≤I

OUT

V

∆

REF

I
VIN=7V

1.4V≤ (V

TA=125°C, 1000 Hrs.

TA=25°C, 20 ms pulse

0.25 %

10Hz to 10khz TA=25°C

TO-220 Junction to Tab

DD Package Junction to Tab

CONDITIONS Typ

7V, P≤ P

IN -VOUT

IN -VOUT

29V, I

≤

IN

29V, I

OUT

1.5A, (V

≤

OUT

1.5A, V

≤

=1% I

IN- VOUT

The Bold specifications apply to the full operating temperature range.
Note 1: Changes in output voltage due to heating effects are covered under the specification for thermal regulation.
Note 2: Fixed Version Only
Note 3: Adjustable Version Only

(NOTE 1) at I

1.5A, 2.75V≤V

≤

OUT

1.5A, 4.0V≤V

≤

OUT

1.5A, 4.75V≤V

≤

OUT

1.5A, 6.5V≤V

≤

OUT

MAX

)≤5.75V, 10mA≤I
)≤5.75V

=10mA, TJ=25°C (Note 3)

OUT

=0mA, TJ=25°C (Note 2)

IN-VOUT

=7V, TJ=25°C (Note 2)

IN

OUT

OUT

) (Note3)

OUT

)=3V, TJ=25°C

=1.5A (Note 3)

(Note 2)

1.5A

≤

Junction to Ambient

Junction to Ambient

= 10mA, Ta=25°C, unless otherwise specified.

OUT

SPX1086A

Min Max

IN

IN

1.5A

≤

IN

≤

IN

≤

29V

≤

29V

≤

29V

29V

1.5

1.5

2.5

2.5

3.3

3.3

5.0

5.0

1.250 1.225 1.270

5 10 10

0.005 0.2 0.2 %

0.005 0.2 0.2 %

0.05 0.3 0.3 %

0.05 0.3 0.3 %

1.1

2.5

0.3

(Note 2)

0.01 0.020 0.020 %/W

0.003 % V

3.0
60

3.0
60

1.485

1.470

2.475

2.450

3.270

3.240

4.95

4.90

1.7

1 1 %

3.0

1.515

1.530

2.525

2.550

3.330

3.360

5.05

5.10

1.2

60

3.0
60

SPX1086

Min Max

1.470

1.455

2.450

2.425

3.230

3.201

4.900

4.850

1.225

1.7

3.0

1.530

1.545

2.550

2.575

3.370

3.399

5.100

5.150

1.270

1.2

A

60

3.0
60

Units

V

V

V

V

V

mA

V

O

C/W

°

C/W

°

Rev. 11/2/00

SPX1086

APPLICATION HINTS

The SPX1086 incorporates protection against over-current
faults, reversed load insertion, over temperature operation, and
positive and negative transient voltage. However, the use of
an output capacitor is required in order to insure the stability
and the performances.

Stability

The output capacitor is part of the regulator’s frequency
compensation system. Either a 220µF aluminum electrolytic
capacitor or a 47µF solid tantalum capacitor between the
output terminal and ground guarantees stable operation for all
operating conditions.
However, in order to minimize overshoot and undershoot, and
therefore optimize the design, please refer to the section
‘Ripple Rejection’.

Ripple Rejection

Ripple rejection can be improved by adding a capacitor
between the ADJ pin and ground. When ADJ pin bypassing is
used, the value of the output capacitor required increases to its
maximum (220µF for an aluminum electrolytic capacitor, or
47µF for a solid tantalum capacitor). If the ADJ pin is not
bypass, the value of the output capacitor can be lowered to
100µF for an electrolytic aluminum capacitor or 15µF for a
solid tantalum capacitor.
However the value of the ADJ-bypass capacitor should be
chosen with respect to the following equation:
C = 1 / ( 6.28 * F

Where C = value of the capacitor in Farads (select an
equal or larger standard value),
F
R

= ripple frequency in Hz,

R

= value of resistor R1 in Ohms.

1

If an ADJ-bypass capacitor is use, the amplitude of the output
ripple will be independent of the output voltage. If an ADJ­bypass capacitor is not used, the output ripple will be
proportional to the ratio of the output voltage to the reference
voltage:
M = V

OUT

/ V
Where M = multiplier for the ripple seen when the ADJ pin
is optimally bypassed.
V

REF

* R1 )

R

REF

= Reference Voltage

Reducing parasitic resistance and inductance

One solution to minimize parasitic resistance and inductance is
to connect in parallel capacitors. This arrangement will
improve the transient response of the power supply if your
system requires rapidly changing current load condition.

Thermal Consideration

Although the SPX1086 offers some limiting circuitry for
overload conditions, it is necessary not to exceed the
maximum junction temperature, and therefore to be careful
about thermal resistance. The heat flow will follow the lowest
resistance path, which is the Junction-to-case thermal
resistance. In order to insure the best thermal flow of the
component, a proper mounting is required. Note that the case
of the device is electrically connected to the output. In case
the case has to be electrically isolated, a thermally conductive
spacer can be used. However do not forget to consider its
contribution to thermal resistance.

Assuming:
V

= 10V, V

IN

θ

Heatsink Case

= 5V, I

OUT

= 6°C/W,

= 1.5A, TA = 50°C/W,

OUT

θ

Heatsink Case

= 0.5°C/W,

= 3°C/W

θ

JC

Power dissipation under this condition
P

= (VIN – V

D

OUT

) * I

= 7.5W

OUT

Junction Temperature
T

= TA + PD * (θ

J

Case – HS

+

+

θ

HS

)

θ

JC

For the Control Sections
T

= 50 + 7.5*(0.5+6=3) = 121.25°C

J

121.25°C < T

for the Control & Power Sections.

J(max)

In both case reliable operation is insured by adequate junction
temperature.

Rev. 11/2/00

SPX1086

Basic Adjustable Regulator

V

IN

SPX1086

I

ADJ

50µA

V

REF

V

= V

OUT

* ( 1 + R2/R1) + I

REF

ADJ

* R

2

V

OUT

R

1

R

2

Fig.2 Basic Adjustable Regulator

Output Voltage

Consider Figure 2. The resistance R

generates a constant

1

current flow, normally the specified load current of 10mA.
This current will go through the resistance R
output voltage. The current I

is very small and constant.

ADJ

to set the overall

2

Therefore its contribution to the overall output voltage is very
small and can generally be ignored

Load Regulation

Parasitic line resistance can degrade load regulation. In order
not to affect the behavior of the regulator, it is best to connect
directly the R

resistance from the resistor divider to the case,

1

and not to the load. For the same reason, it is best to connect
the resistor R

to the Negative side of the load.

2

R

Parasitic Line

P

V

IN

SPX1086

Resistance

Connect R1 to

Case of Regulator

R

1

R

2

Fig.3 Basic Adjustable Regulator

R

L

Connect R2 to Load

Rev. 11/2/00

TYPICAL APPLICATIONS

SPX1086

V

IN

C

1

Fig. 4 1.5A Current output Regulator

(Note A)

V

IN

10µF

*C1 improves ripple rejection. Xc

should be ~ R

Note A: V

IN(MIN)

1

= (Intended V

IN

+

SPX1086

IN OUT

SPX1086

at ripple frequency.

) + (V

OUT

DROPOUT (MAX)

ADJ

ADJ

OUT

365Ω

)

R

1%

V

LOAD

IN

R

1

V

= V

OUT

IN

C

1

(1 + R2 ) + I

REF

R

SPX1086

ADJ

ADJ R2

1

OUT

R

1

R

2

Fig. 5 Typical Adjustable Regulator

5V

V

OUT

R

1

121Ω

1%

150µF

2

+

C

1

10µF*

V

IN

(Note A)

TTL

Input

Note A: V

IN OUT

SPX1086

+

10µF

ADJ

1k

2N3904

1k

= (Intended V

IN(MIN)

OUT

) + (V

121Ω

1%

365Ω

1%

DROPOUT (MAX)

V

OUT

C

2

5V

+

100µF

)

Fig. 6 Improving Ripple Rejection

Fig.7 5V Regulator with Shutdown

Rev. 11/2/00

SPX1086

TYPICAL CHARACTERISTICS

Rev. 11/2/00

SPX1086

ORDERING INFORMATION

Ordering No. Precision Output Voltage Packages

SPX1086U
SPX1086U-1.5
SPX1086U-2.5
SPX1086U-3.3
SPX1086U-5.0
SPX1086AU
SPX1086AU-1.5
SPX1086AU-2.5
SPX1086AU-3.3
SPX1086AU-5.0
SPX1086T
SPX1086T-1.5
SPX1086T-2.5
SPX1086T-3.3
SPX1086T-5.0
SPX1086AT
SPX1086AT-1.5
SPX1086AT-2.5
SPX1086AT-3.3
SPX1086AT-5.0
SPX1086R
SPX1086R-1.5
SPX1086R-2.5
SPX1086R-3.3
SPX1086R-5.0
SPX1086AR
SPX1086AR-1.5
SPX1086AR-2.5
SPX1086AR-3.3
SPX1086AR-5.0

2% Adj 3 Lead TO-220
2% 1.5V 3 Lead TO-220
2% 2.5V 3 Lead TO-220
2% 3.0V 3 Lead TO-220
2% 5.0V 3 Lead TO-220
1% Adj 3 Lead TO-220
1% 1.5V 3 Lead TO-220
1% 2.5V 3 Lead TO-220
1% 3.0V 3 Lead TO-220
1% 5.0V 3 Lead TO-220
2% Adj 3 Lead TO-263
2% 1.5V 3 Lead TO-263
2% 2.5V 3 Lead TO-263
2% 3.0V 3 Lead TO-263
2% 5.0V 3 Lead TO-263
1% Adj 3 Lead TO-263
1% 1.5V 3 Lead TO-263
1% 2.5V 3 Lead TO-263
1% 3.0V 3 Lead TO-263
1% 5.0V 3 Lead TO-263
2% Adj 3 Lead TO-252
2% 1.5V 3 Lead TO-252
2% 2.5V 3 Lead TO-252
2% 3.0V 3 Lead TO-252
2% 5.0V 3 Lead TO-252
1% Adj 3 Lead TO-252
1% 1.5V 3 Lead TO-252
1% 2.5V 3 Lead TO-252
1% 3.0V 3 Lead TO-252
1% 5.0V 3 Lead TO-252

SIGNAL PROCESSING EXCELLENCE

Corporation

Sipex Corporation

Headquarters and Main Offices:

22 Linnell Circle
Billerica, MA 01821
TEL: [phone]
FAX: [phone]
e-mail: [e-mail]

233 South Hillview Drive
Milpitas, CA 95035
TEL: [phone]
FAX: [phone]

Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described
hereing; neither does it convey any license under its patent rights nor the rights of others.

Rev. 11/2/00

Copyright © Each Manufacturing Company.

All Datasheets cannot be modified without permission.

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