LD1085 ST Microelectronics, LD1085 Datasheet

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LD1085

Manufacturer Part Number
LD1085
Description
3A LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS
Manufacturer
ST Microelectronics
Datasheet

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DESCRIPTION
The LD1085 is a LOW DROP Voltage Regulator
able to provide up to 3A of Output Current.
Dropout is guaranteed at a maximum of 1.5V at
the maximum output current, decreasing at
lower loads. The LD1085 is pin compatible with
older 3-terminal adjustable regulators, but has
better performances in term of drop and output
tolerance. A 2.85V output version is suitable for
SCSI-2
BLOCK DIAGRAM
May 2000
OUTPUT VOLATGE 1.8V,2.5V, 2.85V, 3.3V,
3.6V, 5V, 8V, 9V, 12V
3A
-40
ADJUSTABLE VOLTAGE REGULATORS
TYPICAL DROPOUT VOLTAGE 1.3V AT 3A
THREE TERMINAL ADJUSTABLE OR FIXED
GUARANTEED OUTPUT CURRENT UP TO
OUTPUT TOLERANCE 1% AT 25
INTERNAL POWER AND THERMAL LIMIT
WIDE OPERATING TEMPERATURE RANGE
PACKAGE AVAILABLE: TO-220 D
PINOUT COMPATIBILITY WITH STANDARD
2% IN FULL TEMPERATURE RANGE
o
C TO 125
active
o
C
termination.
3A LOW DROP FIXED AND ADJUSTABLE
Unlike
2
o
PAK
POSITIVE VOLTAGE REGULATORS
C AND
PNP
regulators, where a part of the output current is
wasted as quiescent current, the LD1085
quiescent current flow into the load, so increase
efficency. Only a 10
need for stability. The device is supplied in
TO-220, D
chip trimming allows the regulator to reach a
very tight output voltage tolerance, within
at 25
o
C.
TO-220
2
PAK and D
F minimum capacitor is
2
PAK/A packages. On
D
D
2
SERIES
PAK/A
LD1085
2
PAK
1/15
1%

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LD1085 Summary of contents

Page 1

... PACKAGE AVAILABLE: TO-220 D PINOUT COMPATIBILITY WITH STANDARD ADJUSTABLE VOLTAGE REGULATORS DESCRIPTION The LD1085 is a LOW DROP Voltage Regulator able to provide Output Current. Dropout is guaranteed at a maximum of 1.5V at the maximum output current, decreasing at lower loads. The LD1085 is pin compatible with ...

Page 2

... LD1085 SERIES ABSOLUTE MAXIMUM RATINGS Symbol V DC Input Voltage IN I Output Current OUT P Power Dissipation Storage Temperature Range stg T Operating Junction Temperature Range o p Absolute Maximum Ratings are those value beyond which damage to the device may occur. Functional operation under these condition is not implied ...

Page 3

... Short Circuit Current SC Thermal Regulation SVR Supply Voltage Rejection eN Output Noise Voltage S Temperature Stability S Long Term Stability Note1: See short-circuit curve for available output current at fixed dropout. ELECTRICAL CHARACTERISTICS FOR LD1085#25 (refer to the test circuits -40 to 125 5 Symbol Parameter V ...

Page 4

... Short Circuit Current SC Thermal Regulation SVR Supply Voltage Rejection eN Output Noise Voltage S Temperature Stability S Long Term Stability Note1: See short-circuit curve for available output current at fixed dropout. ELECTRICAL CHARACTERISTICS FOR LD1085#33 (refer to the test circuits -40 to 125 6 Symbol Parameter V ...

Page 5

... ELECTRICAL CHARACTERISTICS FOR LD1085#36 (refer to the test circuits -40 to 125 5. Symbol Parameter V Output Voltage O V Output Voltage (Note Line Regulation O V Line Regulation O V Load Regulation O V Load Regulation O V Dropout Voltage d I Quiescent Current d I Short Circuit Current ...

Page 6

... SC Thermal Regulation SVR Supply Voltage Rejection eN Output Noise Voltage S Temperature Stability S Long Term Stability Note1: See short-circuit curve for available output current at fixed dropout. ELECTRICAL CHARACTERISTICS FOR LD1085#90 (refer to the test circuits -40 to 125 Symbol Parameter ...

Page 7

... ELECTRICAL CHARACTERISTICS FOR LD1085#120 (refer to the test circuits -40 to 125 Symbol Parameter V Output Voltage O V Output Voltage (Note Line Regulation O V Line Regulation O V Load Regulation O V Load Regulation O V Dropout Voltage d I Quiescent Current ...

Page 8

... LD1085 SERIES TYPICAL CHARACTERISTICS (unless otherwise specified T Output Voltage vs Temperature Output Voltage vs Temperature Line Regulation vs Temperature 8/15 o =125 = Output Voltage vs Temperature Short Circuit Current vs Dropout Voltage Load Regulation vs Temperature ...

Page 9

... TYPICAL CHARACTERISTICS (Continued) Dropout Voltage vs Temperature Adjust Pin Current vs Temperature Quiescent Current vs Output Current LD1085 SERIES Dropout Voltage vs Output Current Quiescent Current vs Temperature Supply Voltage Rejection vs Output Current 9/15 ...

Page 10

... LD1085 SERIES TYPICAL CHARACTERISTICS (Continued) Supply Voltage Rejection vs Frequency Minimum Load Current vs Temperature Stability 10/15 Supply Voltage Rejection vs Temperature Stability ...

Page 11

... TYPICAL CHARACTERISTICS (Continued) Line Transient Load Transient LD1085 SERIES Line Transient Load Transient 11/15 ...

Page 12

... LD1085 SERIES TO-220 MECHANICAL DATA DIM. MIN. TYP. A 4.40 C 1.23 D 2.40 D1 1.27 E 0.49 F 0.61 F1 1.14 F2 1.14 G 4.95 G1 2.4 H2 10.0 L2 16.4 L4 13.0 L5 2.65 L6 15.25 L7 6.2 L9 3.5 DIA. 3.75 Dia 12/15 mm MAX. MIN. 4.60 0.173 1.32 0.048 2.72 0.094 0.70 0.019 0.88 0.024 1.70 0.044 1.70 0.044 5.15 0.194 2.7 0.094 10.40 0.393 14.0 0.511 2.95 0.104 15.75 0.600 6.6 0.244 3.93 0.137 3.85 0.147 inch TYP. ...

Page 13

... L2 L PAK) MECHANICAL DATA MAX. MIN. 4.6 0.173 2.69 0.098 0.93 0.027 1.7 0.044 0.6 0.017 1.36 0.048 9.35 0.352 10.4 0.393 5.28 0.192 15.85 0.590 1.4 0.050 1.75 0.055 C DETAIL”A” LD1085 SERIES inch TYP. MAX. 0.181 0.106 0.036 0.067 0.023 0.053 0.368 0.409 0.208 0.624 0.055 0.068 P011P6/F 13/15 ...

Page 14

... LD1085 SERIES 2 D PAK/A MECHANICAL DATA mm DIM. MIN. TYP. A 4.4 A1 2.49 B 0.7 B2 1.14 C 0.45 C2 1. 1.27 14/15 inch MAX. MIN. TYP. 4.6 0.173 2.69 0.098 0.93 0.027 1.7 0.044 0.6 0.017 1.36 0.047 9.35 0.352 10.4 0.393 5.28 0.192 15.85 0.590 1.4 0.050 MAX. 0.181 0.106 0.036 0.067 0.023 0.053 0.368 0.409 0.208 0.624 ...

Page 15

... The ST logo is a registered trademark of STMicroelectronics 2000 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com . LD1085 SERIES 15/15 ...

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