SGS Thomson Microelectronics LD1585CD2T90, LD1585CD2T80, LD1585CD2T50, LD1585CD2T33, LD1585CD2T28 Datasheet

1/17September 2003

■ TYPICAL DROPOUT 1.2V

■ FAST TRANSIENT RESPONSE

■ THREE TERMINAL ADJUSTABLE OR FIXED

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

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

■ GUARANTEED OUTPUT CURRENT UP TO

5A

■ OUPUT TOLERANCE ±1% AT 25°C AND

±2% IN FU LL TEMPERATURE RANGE

■ INTERNAL P OWER AND THERMAL LIMIT

■ WIDE OPERATING TEMPERATURE RANGE

0°C TO 125°C

■ PACKAGE AVAILABLE : TO-220, D

2

PAK,

D

2

PAK/A

■ PINOUT COMPATIBILITY WITH STANDARD

ADJUSTABLE VREG

DESCRIPTION

The LD1585C is a LOW DROP Voltage Regulator
able to provide up to 5A of Output Current.
Dropout is guaranteed at a maximum of 1.4V at
the maximum output current, decreas ing at lower
loads. The device h as been i mproved to be
utilized in low voltage applications where transient
response and minimum input voltage are critical.
The most important feature of the device con sist i n
lower dropout voltage and very f as t transient

response. A 2.85V output version is suitable for
SCSI-2 active terminat ion. Unlike PNP regul ato rs,
where a pa rt of the output current is wasted as
quiescent current, the LD1585C quiescent current
flows into the load, so increase efficiency. Only a
10µF minimum capacitor is n eed for stability.
The device is supplied in TO-220, D

2

PAK and

D

2

PAK/A. On chi p t rim ming allows the regulator to
reach a very tight output voltage tolera nc e, within
±1% at 25°C.

LD1585C

SERIES

5A LOW DROPOUT FAST RESPONSE

POSITIVE VOLTAGE REGULATOR ADJUSTABLE AND FIXED

SCHEMATIC DIAGRAM

TO-220

D2PAK D2PAK/A

LD1585C SERIES

2/17

ABSOLUTE MAXIMUM RATINGS

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

THERMAL DATA

APPLICATION CIRCUITS

Symbol Parameter² Value Unit

V

I

DC Input Voltage

30 V

I

O

Output Current

Internally Limited mA

P

D

Power Dissipation

Internally Limited mW

T

stg

Storage Temperature Range

-55 to +150 °C

T

op

Operating Junction Temperature Range

0 to +125 °C

Symbol Parameter TO-220

D

2

PAK

Unit

R

thj-case

Thermal Resistance Junction-case

3 3 °C/W

R

thj-amb

Thermal Resistance Junction-ambient

50 62.5 °C/W

R

2

VO=V

REF

(1 + )

R

1

LD1585C SERIES

3/17

CONNECTION DIAGRAM (top view)

ORDERING CODES

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

TO-220

D

2

PAK D2PAK/A

TO-220

D

2

PAK (*) D2PAK/A (*)

OUTPUT VOLTAGE

LD1585CV15 LD1585CD2T15 LD1585CD2M15 1.5 V
LD1585CV18 LD1585CD2T18 LD1585CD2M18 1.8 V
LD1585CV25 LD1585CD2T25 LD1585CD2M25 2.5 V
LD1585CV28 LD1585CD2T28 LD1585CD2M28 2.85 V
LD1585CV33 LD1585CD2T33 LD1585CD2M33 3.3 V
LD1585CV50 LD1585CD2T50 LD1585CD2M50 5.0 V
LD1585CV80 LD1585CD2T80 LD1585CD2M80 8.0 V
LD1585CV90 LD1585CD2T90 LD1585CD2M90 9.0 V
LD1585CV12 LD1585CD2T120 LD1585CD2M120 12.0 V

LD1585CV LD1585CD2T LD1585CD2M ADJ

LD1585C SERIES

4/17

ELECTRICAL CHARACTERISTICS OF LD158 5#15 (VI=4.5V, CI=CO=10µF, TJ= 0 to 125°C, unless
otherwise specified.)

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

ELECTRICAL CHARACTERISTICS OF LD158 5#18 (VI=4.8V, CI=CO=10µF, TJ= 0 to 125°C, unless
otherwise specified.)

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

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

O

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

I

O

=0to5A VI= 3 to 25V (note 1) 1.47 1.5 1.53 V

∆V

O

Line Regulation IO=0mA VI=3to15V TJ= 25°C 0.005 0.2 %

I

O

=0mA VI= 3 to 15V 0.005 0.2 %

∆V

O

Load Regulation IO=0to5A TJ= 25°C 0.05 0.3 %

I

O

= 0 to 5A 0.05 0.5 %

V

d

Dropout Voltage IO=5 A 1.2 1.4 V

I

q

Quiescent Current VI≤ 25V 5 10 mA

I

sc

Short Circuit Current VI-VO= 5V 5.5 7 A
Termal Regulation T

J

= 25°C, 30ms pulse 0.004 0.02 %/W

SVR Supply Voltage Rejection f = 120 Hz, C

O

=25µF, IO=5A

V

I-VO

=3± 1V

60 75 dB

eN RMS Output Noise Voltage

(% of V

O

)

T

J

= 25°C f =10Hz to 10KHz 0.003 %

S Temperature Stability 0.5 %
S Long Term Stability T

J

= 125°C 1000Hrs 0.03 1 %

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

O

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

I

O

=0to5A VI= 3.3 to 25V (note 1) 1.764 1.8 1.836 V

∆V

O

Line Regulation IO=0mA VI= 3.3 to 15V TJ= 25°C 0.005 0.2 mV

I

O

=0mA VI= 3.3 to 15V 0.005 0.2

∆V

O

Load Regulation IO=0to5A TJ= 25°C 0.05 0.3 mV

I

O

= 0 to 5A 0.05 0.5

V

d

Dropout Voltage IO=5 A 1.2 1.4 V

I

q

Quiescent Current VI≤ 25V 5 10 mA

I

sc

Short Circuit Current VI-VO= 5.5V 5.5 7 A
Termal Regulation T

J

= 25°C, 30ms pulse 0.004 0.02 %/W

SVR Supply Voltage Rejection f = 120 Hz, C

O

=25µF, IO=5A

V

I-VO

=3± 1V

60 75 dB

eN RMS Output Noise Voltage

(% of V

O

)

T

J

= 25°C f =10Hz to 10KHz 0.003 %

S Temperature Stability 0.5 %
S Long Term Stability T

J

= 125°C 1000Hrs 0.03 1 %

LD1585C SERIES

5/17

ELECTRICAL CHARACTERISTICS OF LD158 5#25 (VI=5.5V, CI=CO=10µF, TJ= 0 to 125°C, unless
otherwise specified.)

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

ELECTRICAL CHARACTERI S TICS OF LD1585#285 (VI=5.85V, CI=CO=10µF,TJ= 0 to 125°C, unles s
otherwise specified.)

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

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

O

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

I

O

=0to5A VI= 4 to 25V (note 1) 2.45 2.5 2.55 V

∆V

O

Line Regulation IO=0mA VI=4to16V TJ= 25°C 0.005 0.2 mV

I

O

=0mA VI= 4 to 16V 0.005 0.2

∆V

O

Load Regulation IO=0to5A TJ= 25°C 0.05 0.3 mV

I

O

= 0 to 5A 0.05 0.5

V

d

Dropout Voltage IO=5 A 1.2 1.4 V

I

q

Quiescent Current VI≤ 25V 5 10 mA

I

sc

Short Circuit Current VI-VO= 5.5V 5.5 7 A
Termal Regulation T

J

= 25°C, 30ms pulse 0.004 0.02 %/W

SVR Supply Voltage Rejection f = 120 Hz, C

O

=25µF, IO=5A

V

I-VO

=3± 1V

60 75 dB

eN RMS Output Noise Voltage

(% of V

O

)

T

J

= 25°C f =10Hz to 10KHz 0.003 %

S Temperature Stability 0.5 %
S Long Term Stability T

J

= 125°C 1000Hrs 0.03 1 %

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

O

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

I

O

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

∆V

O

Line Regulation IO=0mA VI= 4.5 to 18V TJ= 25°C 0.005 0.2 mV

I

O

=0mA VI= 4.5 to 18V 0.005 0.2

∆V

O

Load Regulation IO=0to5A TJ= 25°C 0.05 0.3 mV

I

O

= 0 to 5A 0.05 0.5

V

d

Dropout Voltage IO=5 A 1.2 1.4 V

I

q

Quiescent Current VI≤ 25V 5 10 mA

I

sc

Short Circuit Current VI-VO= 5.5V 5.5 7 A
Termal Regulation T

J

= 25°C, 30ms pulse 0.004 0.02 %/W

SVR Supply Voltage Rejection f = 120 Hz, C

O

=25µF, IO=5A

V

I-VO

=3± 1V

60 75 dB

eN RMS Output Noise Voltage

(% of V

O

)

T

J

= 25°C f =10Hz to 10KHz 0.003 %

S Temperature Stability 0.5 %
S Long Term Stability T

J

= 125°C 1000Hrs 0.03 1 %

LD1585C SERIES

6/17

ELECTRICAL CHARACTERISTICS OF LD158 5#33 (VI=6.3V, CI=CO=10µF, TJ= 0 to 125°C, unless
otherwise specified.)

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

ELECTRICAL CHARACTERISTICS OF LD158 5#50 (VI=8V, CI=CO=10µF, TJ= 0 to 125°C, unless
otherwise specified.)

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

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

O

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

I

O

=0to5A VI= 4.8 to 25V (note 1) 3.234 3.35 3.366 V

∆V

O

Line Regulation IO=0mA VI= 4.8 to 18V TJ= 25°C 0.005 0.2 mV

I

O

=0mA VI= 4.9 to 18V 0.005 0.2

∆V

O

Load Regulation IO=0to5A TJ= 25°C 0.05 0.3 mV

I

O

= 0 to 5A 0.05 0.5

V

d

Dropout Voltage IO=5 A 1.2 1.4 V

I

q

Quiescent Current VI≤ 25V 5 10 mA

I

sc

Short Circuit Current VI-VO= 5.5V 5.5 7 A
Termal Regulation T

J

= 25°C, 30ms pulse 0.004 0.02 %/W

SVR Supply Voltage Rejection f = 120 Hz, C

O

=25µF, IO=5A

V

I-VO

=3± 1V

60 75 dB

eN RMS Output Noise Voltage

(% of V

O

)

T

J

= 25°C f =10Hz to 10KHz 0.003 %

S Temperature Stability 0.5 %
S Long Term Stability T

J

= 125°C 1000Hrs 0.03 1 %

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

O

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

I

O

=0to5A VI= 6.5 to 30V (note 1) 4.9 5 5.1 V

∆V

O

Line Regulation IO=0mA VI= 6.5 to 20V TJ= 25°C 0.005 0.2 mV

I

O

=0mA VI= 6.5 to 20V 0.005 0.2

∆V

O

Load Regulation IO=0to5A TJ= 25°C 0.05 0.3 mV

I

O

= 0 to 5A 0.05 0.5

V

d

Dropout Voltage IO=5 A 1.2 1.4 V

I

q

Quiescent Current VI≤ 25V 5 10 mA

I

sc

Short Circuit Current VI-VO= 5.5V 5.5 7 A
Termal Regulation T

J

= 25°C, 30ms pulse 0.004 0.02 %/W

SVR Supply Voltage Rejection f = 120 Hz, C

O

=25µF, IO=5A

V

I-VO

=3± 1V

60 75 dB

eN RMS Output Noise Voltage

(% of V

O

)

T

J

= 25°C f =10Hz to 10KHz 0.003 %

S Temperature Stability 0.5 %
S Long Term Stability T

J

= 125°C 1000Hrs 0.03 1 %