LD1085D2 STMICROELECTRONICS [STMicroelectronics], LD1085D2 Datasheet

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LD1085D2

Manufacturer Part Number
LD1085D2
Description
3A LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
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 1.2V at
the maximum output current, decreasing at lower
loads. The LD1085 is pin to pin compatible with
the older 3-terminal adjustable regulators, but has
better performances in term of drop and output
tolerance.
Figure 1: Schematic Diagram
March 2005
TYPICAL DROPOUT 1.3V (AT 3A)
THREE TERMINAL ADJUSTABLE 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
3A
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
D
PINOUT COMPATIBILITY WITH STANDARD
ADJUSTABLE VREG
2
PAK, D
2
PAK/A
REGULATOR ADJUSTABLE AND FIXED
3A LOW DROP POSITIVE VOLTAGE
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,
D
regulator to reach a very tight output voltage
tolerance, within ±1% at 25°C.
2
PAK and D
TO-220
D
2
PAK
2
PAK/A. On chip trimming allows the
Rev. 14
TO-220FP
D
SERIES
LD1085
2
PAK/A
1/19

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LD1085D2 Summary of contents

Page 1

TYPICAL DROPOUT 1.3V (AT 3A) I THREE TERMINAL ADJUSTABLE OR FIXED I OUTPUT VOLTAGE 1.5V, 1.8V, 2.5V, 2.85V, 3.3V, 3.6V, 5V, 8V, 9V, 12V. GUARANTEED OUTPUT CURRENT OUPUT TOLERANCE ±1% AT 25°C AND I ±2% IN ...

Page 2

... LD1085D2T25 LD1085D2T28 LD1085D2T33 LD1085D2T36 LD1085D2T50 LD1085D2T80 LD1085D2T90 LD1085D2T12 LD1085D2T Parameter TO-220FP 2 D PAK/A 2 OUTPUT VOLTAGE D PAK/A (*) LD1085D2M15 1.5 V LD1085D2M18 1.8 V LD1085D2M25 2.5 V LD1085D2M28 2.85 V LD1085D2M33 3.3 V LD1085D2M36 3.6 V LD1085D2M50 5.0 V LD1085D2M80 8.0 V LD1085D2M90 9.0 V LD1085D2M12 12.0 V LD1085D2M ADJ Value 30 Internally Limited Internally Limited -55 to +150 -40 to +125 Unit °C °C ...

Page 3

Table 3: Thermal Data Symbol R Thermal Resistance Junction-case thj-case R Thermal Resistance Junction-ambient thj-amb Figure 3: Application Circuits Table 4: Electrical Characteristics Of LD1085#15 (V otherwise specified.) Symbol Parameter V Output Voltage O ∆V Line Regulation O ∆V Load ...

Page 4

LD1085 SERIES Table 5: Electrical Characteristics Of LD1085#18 (V otherwise specified.) Symbol Parameter V Output Voltage O ∆V Line Regulation O ∆V Load Regulation O V Dropout Voltage d I Quiescent Current q I Short Circuit Current sc Thermal Regulation ...

Page 5

Table 7: Electrical Characteristics Of LD1085#285 (V unless otherwise specified.) Symbol Parameter V Output Voltage O ∆V Line Regulation O ∆V Load Regulation O V Dropout Voltage d I Quiescent Current q I Short Circuit Current sc Thermal Regulation SVR ...

Page 6

LD1085 SERIES Table 9: Electrical Characteristics Of LD1085#36 (V otherwise specified.) Symbol Parameter V Output Voltage O ∆V Line Regulation O ∆V Load Regulation O V Dropout Voltage d I Quiescent Current q I Short Circuit Current sc Thermal Regulation ...

Page 7

Table 11: Electrical Characteristics Of LD1085#80 (V otherwise specified.) Symbol Parameter V Output Voltage O ∆V Line Regulation O ∆V Load Regulation O V Dropout Voltage d I Quiescent Current q I Short Circuit Current sc Thermal Regulation SVR Supply ...

Page 8

LD1085 SERIES Table 13: Electrical Characteristics Of LD1085#12 (V otherwise specified.) Symbol Parameter V Output Voltage O ∆V Line Regulation O ∆V Load Regulation O V Dropout Voltage d I Quiescent Current q I Short Circuit Current sc Thermal Regulation ...

Page 9

TYPICAL CHARACTERISTICS (unless otherwise specified T Figure 4: Output Voltage vs Temperature Figure 5: Output Voltage vs Temperature Figure 6: Output Voltage vs Temperature = 25° =10µ Figure 7: Short Circuit Current vs Dropout Voltage ...

Page 10

LD1085 SERIES Figure 10: Dropout Voltage vs Temperature Figure 11: Dropout Voltage vs Output Current Figure 12: Adjust Pin Current vs Temperature 10/19 Figure 13: Quiescent Current vs Temperature Figure 14: Dropout Voltage vs Output Current Figure 15: Supply Voltage ...

Page 11

Figure 16: Supply Voltage Rejection vs Frequency Figure 17: Supply Voltage Rejection vs Temperature Figure 18: Minimum Load Current vs Temperature Figure 19: Stability Figure 20: Stability Figure 21: Line Transient V =12 to 13V, I =200mA 1µF(tant), ...

Page 12

LD1085 SERIES Figure 22: Line Transient V =12 to 13V, I =200mA 1µF(tant =1µF ADJ Figure 23: Load Transient V = =0. 1µF(tant ...

Page 13

TO-220 MECHANICAL DAT A DIM. MIN. A 4.40 C 1. 0.49 F 0.61 F1 1.14 F2 1.14 G 4.95 G1 2 13.0 L5 2.65 L6 15.25 L7 6.2 L9 3.5 DIA. 3.75 ...

Page 14

LD1085 SERIES DIM. MIN. A 4.40 B 2.5 D 2.5 E 0.45 F 0.75 F1 1.15 F2 1.15 G 4.95 G1 2 28.6 L4 9.8 L5 2 DIA. 3 14/19 TO-220FP MECHANICAL ...

Page 15

D DIM. MIN. A 4.4 A1 2.49 A2 0.03 B 0.7 B2 1.14 C 0.45 C2 1. 1.27 L3 1 0˚ 2 PAK MEC HANICAL ...

Page 16

LD1085 SERIES DIM. MIN. A 4.40 A1 2.49 A2 0.03 B 0.7 B1 0.8 B2 1.14 C 0.45 C2 1. 1. 0° 16/ ...

Page 17

Ta pe & Reel D PAK-P DIM. MIN 12 10.50 Bo 15.70 15.80 Ko 4.80 Po 3 PAK-D PAK/A-P PAK/A MECHANICAL DATA mm. TYP MAX. 180 ...

Page 18

LD1085 SERIES Table 15: Revision History Date Revision 07-Oct-2004 12 08-Feb-2005 13 01-Mar-2005 14 18/19 Description of Changes Mistake Order Codes - Table 1. Mistake U.M. Load Regulation - V ==> mV. Version 1.2V removed. ...

Page 19

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. ...

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