ST LD1084 User Manual

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REGULATOR ADJUSTABLE AND FIXED

■ TYPICAL DROPOUT 1.3V (AT 5A)

■ THREE TERMINAL ADJUSTABLE OR FIXED

OUTPUT VOLTAGE 1.5, 1.8V , 2.5V, 2.85V,

3.3V,3.6V,5V,8V,9V,12V.

■ GUARANTEED OUTPUT CURRENT UP TO

5A

■ OUPUT TOLERANCE ±1% AT 25°C AND

±2% IN FU LL TEMPERATURE RANGE

■ INTERNAL POWER AND THERMAL LIMIT

■ WIDE OPERATING TEMPERATURE RANGE

-40°C TO 125°C

■ PACKAGE AVAILABLE : TO-220,D

2

D

PAK/A

■ PINOUT COMPATIBILITY WITH STANDARD

ADJUSTABLE VREG

DESCRIPTION

The LD1084 is a LOW DROP Voltage Regulator
able to provide up to 5A of Output Current.
Dropout is guaran teed at a maxim um of 1.5V at
the maximum output current, decreasing at lower
loads. The LD1084 is pin to pin compatible with
the older 3-terminal adj us tab le regulators, but has
better performances in term of drop and output
tolerance .

LD1084

SERIES

5A LOW DROP POSITIVE VOLTAGE

D2PAK

TO-220

2

PAK,

A 2.85V output version is suitable for SCSI-2
active termination. Unlike PNP regulato rs, where
a part of the output current is wasted as quiescent
current, the LD1084 quiescent current flows into
the load, so increase efficiency. Only a 10µF
minimum capac it or is need for stability.
The device is supplied i n T O-220, D

2

D

PAK/A. On chiptrimming allows the regulator to
reach a very tight output voltage tolerance, within
±1% at 25°C.

2

D

PAK/A

2

PAK a nd

SCHEMATIC DIAGRAM

1/18May 2003

LD1084 SERIES

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter² Value Unit

V
I

P

T

T

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.

THERMAL DATA

DC Input Voltage

I

Output Current

O

Power Dissipation

D

Storage Temperature Range

stg

Operating Junction Temperature Range

op

30 V
Internally Limited mA
Internally Limited mW

-55 to +150 °C

-40 to +125 °C

Symbol Parameter TO-220

R

thj-case

R

thj-amb

Thermal Resistance Junction-case
Thermal Resistance Junction-ambient

APPLICATION CIRCUITS

R

VO=V

REF

2

(1 + )

R

1

CONNECTION DIAGRAM (top view)

2

PAK

D

Unit

3 3 °C/W

50 62.5 °C/W

2/18

TO-220

2

PAK D2PAK/A

D

ORDERING CODES

LD1084 SE RIE S

TYPE

2

PAK (*) D2PAK/A

D

OUTPUT VOLTAGE

LD1084V15 LD1084D2T15 LD1084D2M15 1.5 V
LD1084V18 LD1084D2T18 LD1084D2M18 1.8 V
LD1084V25 LD1084D2T25 LD1084D2M25 2.5 V
LD1084V28 LD1084D2T28 LD1084D2M28 2.85 V
LD1084V33 LD1084D2T33 LD1084D2M33 3.3 V
LD1084V36 LD1084D2T36 LD1084D2M36 3.6 V
LD1084V50 LD1084D2T50 LD1084D2M50 5.0 V
LD1084V80 LD1084D2T80 LD1084D2M80 8.0 V
LD1084V90 LD1084D2T90 LD1084D2M90 9.0 V

LD1084V120 LD1084D2T120 LD1084D2M120 12.0 V

LD1084V LD1084D2T LD1084D2M ADJ

(*) Available in Tape & Reel with the suffix "R" for fixed versions and "-R" for adjustable version

LECTRICAL CHARACTERISTICS O F L D1084#15 (VI=4.5V, CI=CO=10µF, TA= -40 to 125°C, unless
otherwise specified.)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

Output Voltage IO=0mA TJ= 25°C 1.485 1.5 1.515 V

O

=0to5A VI= 3.1 to 30V (note 1) 1.47 1.5 1.53 V

I

O

∆V

∆V

SVR Supply Voltage Rejection f = 120 Hz, C

NOTE 1: See short-circuit current curve for available output current at fixed dropout.

Line Regulation IO=0mA VI= 3.1 to 18V TJ= 25°C 0.5 6 mV

O

=0mA VI= 3.1 to 15V 0.1 6 mV

I

O

Load Regulation IO=0to5A TJ= 25°C 3 15 mV

O

=0to5A 7 20 V

I

O

Dropout Voltage IO=5 A 1.3 1.5 V

V

d

Quiescent Current VI≤ 30V 5 10 mA

I

q

I

Short Circuit Current VI-VO= 5V 5.5 6.5 A

sc

= 25V 0.5 0.7 A

V

I-VO

Termal Regulation T

eN RMS Output Noise Voltage

(% of V

)

O

= 25°C, 30ms pulse 0.003 0.015 %/W

A

=25µF, IO=5A

V

= 6.8 ± 3V

I

T

= 25°C f =10Hz to 10KHz 0.003 %

A

O

60 75 dB

S Temperature Stability 0.5 %
S Long Term Stability T

= 125°C 1000Hrs 0.5 %

A

3/18

LD1084 SERIES

ELECTRICAL CHARACTERISTICS OF LD1084#18 (VI=4.8V, CI=CO=10µF, TA= -40 to 125°C, unless

otherwise specified.)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

Output Voltage IO=0mA TJ= 25°C 1.782 1.8 1.818 V

O

=0to5A VI= 3.4 to 30V (note 1) 1.764 1.8 1.836 V

I

O

∆V

∆V

SVR Supply Voltage Rejection f = 120 Hz, C

NOTE 1: See short-circuit current curve for available output current at fixed dropout.

Line Regulation IO=0mA VI= 3.4 to 18V TJ= 25°C 0.5 6 mV

O

=0mA VI= 3.4 to 15V 0.1 6 mV

I

O

Load Regulation IO=0to5A TJ= 25°C 3 15 mV

O

=0to5A 7 20 V

I

O

Dropout Voltage IO=5 A 1.3 1.5 V

V

d

Quiescent Current VI≤ 30V 5 10 mA

I

q

Short Circuit Current VI-VO= 5V 5.5 6.5 A

I

sc

= 25V 0.5 0.7 A

V

I-VO

Termal Regulation T

eN RMS Output Noise Voltage

(% of V

)

O

= 25°C, 30ms pulse 0.003 0.015 %/W

A

=25µF, IO=5A

V

= 6.8 ± 3V

I

T

= 25°C f =10Hz to 10KHz 0.003 %

A

O

60 75 dB

S Temperature Stability 0.5 %
S Long Term Stability T

= 125°C 1000Hrs 0.5 %

A

ELECTRICAL CHARACTERISTICS OF LD1084#25 (VI=5.5V, CI=CO=10µF, TA= -40 to 125°C, unless
otherwise specified.)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Output Voltage IO=0mA TJ= 25°C 2.475 2.5 2.525 V

V

O

I

=0to5A VI= 4.1 to 30V (note 1) 2.45 2.5 2.55 V

O

∆V

∆V

SVR Supply Voltage Rejection f = 120 Hz, C

NOTE 1: See short-circuit current curve for available output current at fixed dropout.

Line Regulation IO=0mA VI= 4.1 to 18V TJ= 25°C 0.5 6 mV

O

=0mA VI= 4.1 to 18V 0.1 6 mV

I

O

Load Regulation IO=0to5A TJ= 25°C 3 15 mV

O

=0to5A 7 20 V

I

O

V

Dropout Voltage IO=5 A 1.3 1.5 V

d

Quiescent Current VI≤ 30V 5 10 mA

I

q

Short Circuit Current VI-VO= 5V 5.5 6.5 A

I

sc

= 25V 0.5 0.7 A

V

I-VO

Termal Regulation T

eN RMS Output Noise Voltage

(% of V

)

O

= 25°C, 30ms pulse 0.003 0.015 %/W

A

=25µF, IO=5A

V

= 7.5 ± 3V

I

T

= 25°C f =10Hz to 10KHz 0.003 %

A

O

60 72 dB

S Temperature Stability 0.5 %
S Long Term Stability T

= 125°C 1000Hrs 0.5 %

A

4/18

LD1084 SE RIE S

ELECTRICAL CHARACTERISTICS OF LD1084#285 (VI=5.85V, CI=CO=10µF, TA= -40 to 125°C,

unless otherwise specified. )

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

Output Voltage IO=0mA TJ= 25°C 2.821 2.85 2.879 V

O

=0to5A VI= 4.5 to 30V (note 1) 2.793 2.85 2.907 V

I

O

∆V

∆V

SVR Supply Voltage Rejection f = 120 Hz, C

NOTE 1: See short-circuit current curve for available output current at fixed dropout.

Line Regulation IO=0mA VI= 4.5 to 18V TJ= 25°C 0.5 6 mV

O

=0mA VI= 4.5 to 18V 0.1 6 mV

I

O

Load Regulation IO=0to5A TJ= 25°C 3 15 mV

O

I

=0to5A 7 20 V

O

Dropout Voltage IO=5 A 1.3 1.5 V

V

d

Quiescent Current VI≤ 30V 5 10 mA

I

q

Short Circuit Current VI-VO= 5V 5.5 6.5 A

I

sc

= 25V 0.5 0.7 A

V

I-VO

Termal Regulation T

eN RMS Output Noise Voltage

(% of V

)

O

= 25°C, 30ms pulse 0.003 0.015 %/W

A

=25µF, IO=5A

V

= 7.85 ± 3V

I

T

= 25°C f =10Hz to 10KHz 0.003 %

A

O

60 72 dB

S Temperature Stability 0.5 %
S Long Term Stability T

= 125°C 1000Hrs 0.5 %

A

ELECTRICAL CHARACTERISTICS OF LD1084#33 (VI=6.3V, CI=CO=10µF, TA= -40 to 125°C, unless
otherwise specified.)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Output Voltage IO=0mA TJ= 25°C 3.267 3.3 3.333 V

V

O

=0to5A VI= 4.9 to 30V (note 1) 3.234 3.35 3.366 V

I

O

∆V

∆V

SVR Supply Voltage Rejection f = 120 Hz, C

NOTE 1: See short-circuit current curve for available output current at fixed dropout.

Line Regulation IO=0mA VI= 4.9 to 18V TJ= 25°C 0.5 6 mV

O

=0mA VI= 4.9 to 18V 0.1 6 mV

I

O

Load Regulation IO=0to5A TJ= 25°C 3 15 mV

O

=0to5A 7 20 V

I

O

Dropout Voltage IO=5 A 1.3 1.5 V

V

d

Quiescent Current VI≤ 30V 5 10 mA

I

q

Short Circuit Current VI-VO= 5V 5.5 6.5 A

I

sc

= 25V 0.5 0.7 A

V

I-VO

Termal Regulation T

eN RMS Output Noise Voltage

(% of V

)

O

= 25°C, 30ms pulse 0.003 0.015 %/W

A

=25µF, IO=5A

V

= 8.3 ± 3V

I

T

= 25°C f =10Hz to 10KHz 0.003 %

A

O

60 72 dB

S Temperature Stability 0.5 %
S Long Term Stability T

= 125°C 1000Hrs 0.5 %

A

5/18

LD1084 SERIES

ELECTRICAL CHARACTERISTICS OF LD1084#36 (VI=6.6V, CI=CO=10µF, TA= -40 to 125°C, unless

otherwise specified.)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

Output Voltage IO=0mA TJ= 25°C 3.564 3.6 3.636 V

O

=0to5A VI= 5.2 to 30V (note 1) 3.528 3.6 3.672 V

I

O

∆V

∆V

SVR Supply Voltage Rejection f = 120 Hz, C

NOTE 1: See short-circuit current curve for available output current at fixed dropout.

Line Regulation IO=0mA VI= 5.2 to 18V TJ= 25°C 0.5 10 mV

O

=0mA VI= 5.2 to 18V 0.1 10 mV

I

O

Load Regulation IO=0to5A TJ= 25°C 3 15 mV

O

I

=0to5A 7 20 V

O

Dropout Voltage IO=5 A 1.3 1.5 V

V

d

Quiescent Current VI≤ 30V 5 10 mA

I

q

Short Circuit Current VI-VO= 5V 5.5 6.5 A

I

sc

= 25V 0.5 0.7 A

V

I-VO

Termal Regulation T

eN RMS Output Noise Voltage

(% of V

)

O

= 25°C, 30ms pulse 0.003 0.015 %/W

A

=25µF, IO=5A

V

= 8.6 ± 3V

I

T

= 25°C f =10Hz to 10KHz 0.003 %

A

O

60 72 dB

S Temperature Stability 0.5 %
S Long Term Stability T

= 125°C 1000Hrs 0.5 %

A

ELECTRICAL CHARACTERISTICS OF LD1084#5 (VI=8V, CI=CO=10µF, TA= -40 to 125°C, unless
otherwise specified.)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Output Voltage IO=0mA TJ= 25°C 4.95 5 5.05 V

V

O

=0to5A VI= 6.6 to 30V (note 1) 4.9 5 5.1 V

I

O

∆V

∆V

SVR Supply Voltage Rejection f = 120 Hz, C

NOTE 1: See short-circuit current curve for available output current at fixed dropout.

Line Regulation IO=0mA VI= 6.6 to 20V TJ= 25°C 0.5 10 mV

O

=0mA VI= 6.6 to 20V 1 10 mV

I

O

Load Regulation IO=0to5A TJ= 25°C 5 20 mV

O

I

=0to5A 10 35 V

O

Dropout Voltage IO=5 A 1.3 1.5 V

V

d

Quiescent Current VI≤ 30V 5 10 mA

I

q

Short Circuit Current VI-VO= 5V 5.5 6.5 A

I

sc

= 25V 0.5 0.7 A

V

I-VO

Termal Regulation T

eN RMS Output Noise Voltage

(% of V

)

O

= 25°C, 30ms pulse 0.003 0.015 %/W

A

=25µF, IO=5A

V

=10± 3V

I

T

= 25°C f =10Hz to 10KHz 0.003 %

A

O

60 72 dB

S Temperature Stability 0.5 %
S Long Term Stability T

= 125°C 1000Hrs 0.5 %

A

6/18