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LD1085

SERIES

3A LOW DROP POSITIVE VOLTAGE

REGULATOR ADJUSTABLE AND FIXED

■ TYPICAL DROPOUT 1.3V (AT 3A)

■ THREE TERMINAL AD JUSTABLE OR FIXED

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

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

■ GUARANTEED OUTPUT CURRENT UP TO

■ OUPUT TOLERANCE ±1% AT 25°C AND

±2% IN FULL TEMPERATURE RANGE

■ INTERNAL POWER AND THERMAL LIMIT

■ WIDE OPERATING TEMPERATURE RANGE

-40°C TO 125°C

■ PACKAGE AVAILABLE: TO-220, TO-220FP

PAK, D2PAK/A

■ PINOUT COMPATIBILITY WITH STANDARD

ADJUSTABLE VREG

DESCRIPTION

The LD1085 is a LOW DROP Voltage Regulator able to provide up to 3A of Output Current. Dropout is guaran teed at a maximum o f 1.2V at the maximum output current, decreas ing at lower loads. The LD1085 is pin to pin compat ible with the older 3-terminal adjustable regulators, but has better performances in term of drop and output tolerance.

TO-220

D2PAK D2PAK/A

TO-220FP

A 2.85V output version is suitable for SCSI-2 active termination. Unlike PNP regulators, where a part of the output current is wasted as quiescent current, the LD1085 quiescent current flows into the load, so increase efficiency. Only a 10µF minimum capacitor is need for stability. The device is supplied in TO-220, TO-220FP,

PAK and D2PAK/A. On chip t rimming allows the regulator to reach a very tight output voltage tolerance, within ±1% at 25°C.

Figure 1: Schematic Diagram

Rev. 14

1/19March 2005

LD1085 SERIES

Figure 2: Pin Connec tion (top view)

TO-220 TO-220FP

PAK D2PAK/A

Table 1: Order Codes

TO-220 TO-220FP

PAK (*) D2PAK/A (*)

LD1085V15 LD1085P15 LD1085D2T15 LD1085D2M15 1.5 V LD1085V18 LD1085P18 LD1085D2T18 LD1085D2M18 1.8 V LD1085V25 LD1085P25 LD1085D2T25 LD1085D2M25 2.5 V LD1085V28 LD1085P28 LD1085D2T28 LD1085D2M28 2.85 V LD1085V33 LD1085P33 LD1085D2T33 LD1085D2M33 3.3 V LD1085V36 LD1085P36 LD1085D2T36 LD1085D2M36 3.6 V LD1085V50 LD1085P50 LD1085D2T50 LD1085D2M50 5.0 V LD1085V80 LD1085P80 LD1085D2T80 LD1085D2M80 8.0 V LD1085V90 LD1085P90 LD1085D2T90 LD1085D2M90 9.0 V LD1085V12 LD1085P12 LD1085D2T12 LD1085D2M12 12.0 V

LD1085V LD1085P LD1085D2T LD1085D2M ADJ

(*) Avai l abl e in Tape & Reel with the suffix "R" for fixed ve rsion and "-R" for adj ustable version.

OUTPUT VOLTAGE

Table 2: Absolute Maximum Ratings

Symbol Parameter Value Unit

V I

DC Input Voltage

Output Current

Power Dissipation

Storage Temperature Range

stg

Operating Junction Temperature Range

30 V Internally Limited mA Internally Limited mW

-55 to +150 °C

-40 to +125 °C

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

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Table 3: Thermal Data

LD1085 SERIES

Symbol Parameter TO-220

thj-case

thj-amb

Thermal Resistance Junction-case Thermal Resistance Junction-ambient

33°C/W

50 62.5 °C/W

PAK

Unit

Figure 3: Applica tion Circuits

(1 + )

Table 4: Electrical Characteristics Of LD1085#15 (V

VO = V

REF

=4.5V, CI = CO =10µF, TA = -40 to 125°C, unless

otherwise specified.)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

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

= 0 to 5AVI = 3.1 to 30V (note 1) 1.47 1.5 1.53 V

∆V

SVR Supply Voltage Rejection f = 120 Hz, C

Line Regulation IO = 0 mA VI = 3.1 to 18V TJ = 25°C 0.2 4 mV

= 0 mA VI = 3.1 to 15V 0.4 4 mV

Load Regulation IO = 0 to 3ATJ = 25°C 2 10 mV

= 0 to 3A 4 20 mV

Dropout Voltage IO =3 A 1.3 1.5 V

Quiescent Current VI ≤ 30V 5 10 mA

Short Circuit Current VI - VO = 5V 3.2 4.5 A

- VO = 25V 0.2 0.5 A

Thermal Regulation T

eN RMS Output Noise Voltage

(% of V

)

= 25°C, 30ms pulse 0.008 0.04 %/W

= 25 µF, IO = 3A

= 7.5 ± 3V

= 25°C f =10Hz to 10KHz 0.003 %

60 72 dB

S Temperature Stability 0.5 % S Long Term Stability TA = 125°C 1000Hrs 0.5 %

NOTE 1: Se e short-circuit curr ent curve for available output cur rent at fixed dropout.

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LD1085 SERIES

Table 5: Electrical Characteristics Of LD1085#18 (VI=4.8V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

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

= 0 to 5AVI = 3.4 to 30V (note 1) 1.764 1.8 1.836 V

∆V

SVR Supply Voltage Rejection f = 120 Hz, C

Line Regulation IO = 0 mA VI = 3.4 to 18V TJ = 25°C 0.2 4 mV

= 0 mA VI = 3.4 to 15V 0.4 4 mV

Load Regulation IO = 0 to 3ATJ = 25°C 2 10 mV

= 0 to 3A 4 20 mV

Dropout Voltage IO =3 A 1.3 1.5 V

Quiescent Current VI ≤ 30V 5 10 mA

Short Circuit Current VI - VO = 5V 3.2 4.5 A

- VO = 25V 0.2 0.5 A

Thermal Regulation T

eN RMS Output Noise Voltage

(% of V

)

= 25°C, 30ms pulse 0.008 0.04 %/W

= 25 µF, IO = 3A

= 7.5 ± 3V

= 25°C f =10Hz to 10KHz 0.003 %

60 72 dB

S Temperature Stability 0.5 % S Long Term Stability TA = 125°C 1000Hrs 0.5 %

NOTE 1: Se e short-circuit curr ent curve for available output cur rent at fixed dropout.

Table 6: Electrical Characteristics Of LD1085#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 = 0 mA TJ = 25°C 2.475 2.5 2.525 V

= 0 to 3AVI = 4.1 to 30V (note 1) 2.45 2.5 2.55 V

∆V

SVR Supply Voltage Rejection f = 120 Hz, C

Line Regulation IO = 0 mA VI = 4.1 to 18V TJ = 25°C 0.2 4 mV

= 0 mA VI = 4.1 to 18V 0.4 4 mV

Load Regulation IO = 0 to 3ATJ = 25°C 2 10 mV

= 0 to 3A 4 20 mV

Dropout Voltage IO =3 A 1.3 1.5 V

Quiescent Current VI ≤ 30V 5 10 mA

Short Circuit Current VI - VO = 5V 3.2 4.5 A

- VO = 25V 0.2 0.5 A

Thermal Regulation T

eN RMS Output Noise Voltage

(% of V

)

= 25°C, 30ms pulse 0.008 0.04 %/W

= 25 µF, IO = 3A

= 7.5 ± 3V

= 25°C f =10Hz to 10KHz 0.003 %

60 72 dB

S Temperature Stability 0.5 % S Long Term Stability T

= 125°C 1000Hrs 0.5 %

NOTE 1: Se e short-circuit curr ent curve for available output cur rent at fixed dropout.

4/19

LD1085 SERIES

Table 7: Electrical Characteristics Of LD1085#285 (VI=5.85V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

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

= 0 to 3AVI = 4.5 to 30V (note 1) 2.793 2.85 2.907 V

∆V

SVR Supply Voltage Rejection f = 120 Hz, C

Line Regulation IO = 0 mA VI = 4.5 to 18V TJ = 25°C 0.2 6 mV

= 0 mA VI = 4.5 to 18V 0.5 6 mV

Load Regulation IO = 0 to 3ATJ = 25°C 3 15 mV

= 0 to 3A 7 20 mV

Dropout Voltage IO =3 A 1.3 1.5 V

Quiescent Current VI ≤ 30V 5 10 mA

Short Circuit Current VI - VO = 5V 3.2 4.5 A

- VO = 25V 0.2 0.5 A

Thermal Regulation T

eN RMS Output Noise Voltage

(% of V

)

= 25°C, 30ms pulse 0.008 0.04 %/W

= 25 µF, IO = 3A

= 7.85 ± 3V

= 25°C f =10Hz to 10KHz 0.003 %

60 72 dB

S Temperature Stability 0.5 % S Long Term Stability TA = 125°C 1000Hrs 0.5 %

NOTE 1: Se e short-circuit curr ent curve for available output cur rent at fixed dropout.

Table 8: Electrical Characteristics Of LD1085#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 = 0 mA TJ = 25°C 3.267 3.3 3.333 V

= 0 to 3AVI = 4.9 to 30V (note 1) 3.234 3.35 3.366 V

∆V

SVR Supply Voltage Rejection f = 120 Hz, C

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

= 0 mA VI = 4.9 to 18V 1 6 mV

Load Regulation IO = 0 to 3ATJ = 25°C 3 15 mV

= 0 to 3A 7 20 mV

Dropout Voltage IO =3 A 1.3 1.5 V

Quiescent Current VI ≤ 30V 5 10 mA

Short Circuit Current VI - VO = 5V 3.2 4.5 A

- VO = 25V 0.2 0.5 A

Thermal Regulation T

eN RMS Output Noise Voltage

(% of V

)

= 25°C, 30ms pulse 0.008 0.04 %/W

= 25 µF, IO = 5A

= 8.3 ± 3V

= 25°C f =10Hz to 10KHz 0.003 %

60 72 dB

S Temperature Stability 0.5 % S Long Term Stability T

= 125°C 1000Hrs 0.5 %

NOTE 1: Se e short-circuit curr ent curve for available output cur rent at fixed dropout.

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LD1085 SERIES

Table 9: Electrical Characteristics Of LD1085#36 (VI=6.6V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

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

= 0 to 3AVI = 5.2 to 30V (note 1) 3.528 3.6 3.672 V

∆V

SVR Supply Voltage Rejection f = 120 Hz, C

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

= 0 mA VI = 5.2 to 18V 1 10 mV

Load Regulation IO = 0 to 3ATJ = 25°C 3 15 mV

= 0 to 3A 7 20 mV

Dropout Voltage IO =3 A 1.3 1.5 V

Quiescent Current VI ≤ 30V 5 10 mA

Short Circuit Current VI - VO = 5V 3.2 4.5 A

- VO = 25V 0.2 0.5 A

Thermal Regulation T

eN RMS Output Noise Voltage

(% of V

)

= 25°C, 30ms pulse 0.008 0.04 %/W

= 25 µF, IO = 3A

= 8.6 ± 3V

= 25°C f =10Hz to 10KHz 0.003 %

60 72 dB

S Temperature Stability 0.5 % S Long Term Stability TA = 125°C 1000Hrs 0.5 %

NOTE 1: Se e short-circuit curr ent curve for available output cur rent at fixed dropout.

Table 10: Electrical Characteristics Of LD1085#50 (VI=8V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

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

= 0 to 3AVI = 6.6 to 30V (note 1) 4.9 5 5.1 V

∆V

SVR Supply Voltage Rejection f = 120 Hz, C

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

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

Load Regulation IO = 0 to 3ATJ = 25°C 5 10 mV

= 0 to 3A 10 35 mV

Dropout Voltage IO =3 A 1.3 1.5 V

Quiescent Current VI ≤ 30V 5 10 mA

Short Circuit Current VI - VO = 5V 3.2 4.5 A

- VO = 25V 0.2 0.5 A

Thermal Regulation T

eN RMS Output Noise Voltage

(% of V

)

= 25°C, 30ms pulse 0.008 0.04 %/W

= 25 µF, IO = 3A

= 10 ± 3V

= 25°C f =10Hz to 10KHz 0.003 %

60 72 dB

S Temperature Stability 0.5 % S Long Term Stability T

= 125°C 1000Hrs 0.5 %

NOTE 1: Se e short-circuit curr ent curve for available output cur rent at fixed dropout.

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