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LD1086
User Manual
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User Manual
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ST LD1086 User Manual

LD1086
SERIES
1.5A LOW DROP POSITIVE VOLTAGE
REGULATOR ADJUSTABLE AND FIXED
■ TYPICAL DROPOUT 1.3V AT 1.5A
■ THREE TERMINAL AD JUSTABLE O R FIXED
OUTPUT VOLTAGE 1.5V , 1.8V, 2.5V, 2.85V,
3.3V , 3.6V, 5V, 8V, 9V, 12V.
■ GUARANTEED OUTPUT CURRENT UP TO
1.5A
■ OUPUT TOLERANCE ±1% AT 25°C AND
■ INTERNAL POWER AND THERMAL LIMIT
■ WIDE OPERATING TEMPERATURE RANGE
-40°C TO 125°C
■ PACKAGE AVAILABLE: TO-220, D
2
D
PAK/A, DPAK
■ PINOUT COMPATIBILITY WITH STANDARD
2
PAK,
ADJUSTABLE VREG
DESCRIPTION
The LD1086 is a LOW DROP Voltage Regulator able to provide up to 1.5A 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 LD1086 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 DPAK
D2PAK D2PAK/A
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 LD1086 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, D
2
PAK, D2PAK/A and DPAK. On chip tr imming allows the regulator to reach a very tight output voltage tolerance, within ±1% at 25°C.

Table 1: Order Codes

TO-220
LD1086V15 LD1086D2T15 LD1086D2M15 LD1086DT15 1.5 V LD1086V18 LD1086D2T18 LD1086D2M18 LD1086DT18 1.8 V LD1086V25 LD1086D2T25 LD1086D2M25 LD1086DT25 2.5 V LD1086V28 LD1086D2T28 LD1086D2M28 LD1086DT28 2.85 V LD1086V33 LD1086D2T33 LD1086D2M33 LD1086DT33 3.3 V LD1086V36 LD1086D2T36 LD1086D2M36 LD1086DT36 3.6 V LD1086V50 LD1086D2T50 LD1086D2M50 LD1086DT50 5.0 V LD1086V80 LD1086D2T80 LD1086D2M80 LD1086DT80 8.0 V LD1086V90 LD1086D2T90 LD1086D2M90 LD1086DT90 9.0 V LD1086V12 LD1086D2T12 LD1086D2M12 LD1086DT12 12.0 V
LD1086V LD1086D2T LD1086D2M LD1086DT ADJ
(*) Avai l abl e in Tape & Reel with the suffix "TR" .
2
PAK (*) D2PAK/A (*)
D
DPAK (*) OUTPUT VOLTAGE
Rev. 13
1/21February 2005
LD1086 SERIES

Figure 1: Pin Connec tion (top view)

TO-220 D2PAK

Table 2: Absolute Maximum Ratings

D2PAK/ADPAK
Symbol Parameter 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.
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

Table 3: Thermal Data

Symbol Parameter TO-220
R
thj-case
R
thj-amb
Thermal Resistance Junction-case Thermal Resistance Junction-ambient
338°C/W
50 62.5 °C/W
2
D
PAK
DPAK Unit

Figure 2: Application Circuits

2/21
VO = V
(1 + )
REF
R R
2 1

Figure 3: Schematic Diagram

LD1086 SERIES
Table 4: Electrical Characteristics Of LD1086#15 (V
=4.5V, CI = CO =10µF, TA = -40 to 125°C, unless
I
otherwise specified.)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage (note 1) IO = 0 mA TJ = 25°C 1.485 1.5 1.515 V
O
= 0 to 1.5A VI = 3.4 to 30V 1.47 1.5 1.53 V
I
O
∆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
O
= 0 mA VI = 3.1 to 15V 0.4 4 mV
I
O
Load Regulation IO = 0 to 1.5A TJ = 25°C 0.5 8 mV
O
= 0 to 1.5A 1 16 mV
I
O
Dropout Voltage IO = 1.5A 1.3 1.5 V
V
d
I
Quiescent Current VI ≤ 30V 5 10 mA
q
Short Circuit Current VI - VO = 5V 1.5 2 A
I
sc
- VO = 25V 0.05 0.02 A
V
I
Thermal Regulation T
eN RMS Output Noise Voltage
(% of V
)
O
= 25°C, 30ms pulse 0.01 0.04 %/W
A
= 25 µF, IO = 1.5A
V
= 6.5 ± 3V
I
T
= 25°C f =10Hz to 10KHz 0.003 %
A
O
60 82 dB
S Temperature Stability 0.5 % S Long Term Stability T
= 125°C 1000Hrs 0.5 %
A
NOTE 1: Se e short-cir cuit current curve for avail able outp ut current at fixed dropout .
3/21
LD1086 SERIES
Table 5: Electrical Characteristics Of LD1086#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 (note 1) IO = 0 mA TJ = 25°C 1.782 1.8 1.818 V
O
= 0 to 1.5A VI = 3.4 to 30V 1.764 1.8 1.836 V
I
O
∆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
O
= 0 mA VI = 3.4 to 15V 0.4 4 mV
I
O
Load Regulation IO = 0 to 1.5A TJ = 25°C 0.5 8 mV
O
= 0 to 1.5A 1 16 mV
I
O
Dropout Voltage IO = 1.5A 1.3 1.5 V
V
d
I
Quiescent Current VI ≤ 30V 5 10 mA
q
Short Circuit Current VI - VO = 5V 1.5 2 A
I
sc
- VO = 25V 0.05 0.02 A
V
I
Thermal Regulation T
eN RMS Output Noise Voltage
(% of V
)
O
= 25°C, 30ms pulse 0.01 0.04 %/W
A
= 25 µF, IO = 1.5A
V
= 6.8 ± 3V
I
T
= 25°C f =10Hz to 10KHz 0.003 %
A
O
60 82 dB
S Temperature Stability 0.5 % S Long Term Stability TA = 125°C 1000Hrs 0.5 %
NOTE 1: Se e short-cir cuit current curve for avail able outp ut current at fixed dropout .
Table 6: Electrical Characteristics Of LD1086#25 (VI=5.5V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage (note 1) IO = 0 mA TJ = 25°C 2.475 2.5 2.525 V
O
I
= 0 to 1.5A VI = 4.1 to 30V 2.45 2.5 2.55 V
O
∆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
O
= 0 mA VI = 4.1 to 18V 0.4 4 mV
I
O
Load Regulation IO = 0 to 1.5A TJ = 25°C 0.5 8 mV
O
I
= 0 to 1.5A 1 16 mV
O
Dropout Voltage IO = 1.5A 1.3 1.5 V
V
d
Quiescent Current VI ≤ 30V 5 10 mA
I
q
Short Circuit Current VI - VO = 5V 1.5 2 A
I
sc
- VO = 25V 0.05 0.2 A
V
I
Thermal Regulation T
eN RMS Output Noise Voltage
(% of V
)
O
= 25°C, 30ms pulse 0.008 0.04 %/W
A
= 25 µF, IO = 1.5A
V
= 7.5 ± 3V
I
T
= 25°C f =10Hz to 10KHz 0.003 %
A
O
60 81 dB
S Temperature Stability 0.5 % S Long Term Stability T
= 125°C 1000Hrs 0.5 %
A
NOTE 1: Se e short-cir cuit current curve for avail able outp ut current at fixed dropout .
4/21
LD1086 SERIES
Table 7: Electrical Characteristics Of LD1086#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 (note 1) IO = 0 mA TJ = 25°C 2.821 2.85 2.879 V
O
= 0 to 1.5A VI = 4.5 to 30V 2.793 2.85 2.907 V
I
O
∆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
O
= 0 mA VI = 4.5 to 18V 0.5 6 mV
I
O
Load Regulation IO = 0 to 1.5A TJ = 25°C 1 12 mV
O
= 0 to 1.5A 2 20 mV
I
O
Dropout Voltage IO = 1.5A 1.3 1.5 V
V
d
I
Quiescent Current VI ≤ 30V 5 10 mA
q
Short Circuit Current VI - VO = 5V 1.5 2 A
I
sc
- VO = 25V 0.05 0.2 A
V
I
Thermal Regulation T
eN RMS Output Noise Voltage
(% of V
)
O
= 25°C, 30ms pulse 0.01 0.04 %/W
A
= 25 µF, IO = 1.5A
V
= 7.85 ± 3V
I
T
= 25°C f =10Hz to 10KHz 0.003 %
A
O
60 80 dB
S Temperature Stability 0.5 % S Long Term Stability TA = 125°C 1000Hrs 0.5 %
NOTE 1: Se e short-cir cuit current curve for avail able outp ut current at fixed dropout .
Table 8: Electrical Characteristics Of LD1086#33 (VI=6.3V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage (note 1) IO = 0 mA TJ = 25°C 3.267 3.3 3.333 V
O
I
= 0 to 1.5A‘ VI = 4.9 to 30V 3.234 3.3 3.366 V
O
∆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
O
= 0 mA VI = 4.9 to 18V 1 6 mV
I
O
Load Regulation IO = 0 to 1.5A TJ = 25°C 1 10 mV
O
I
= 0 to 1.5A 7 25 mV
O
Dropout Voltage IO = 1.5A 1.3 1.5 V
V
d
Quiescent Current VI ≤ 30V 5 10 mA
I
q
Short Circuit Current VI - VO = 5V 1.5 2 A
I
sc
- VO = 25V 0.05 0.2 A
V
I
Thermal Regulation T
eN RMS Output Noise Voltage
(% of V
)
O
= 25°C, 30ms pulse 0.008 0.04 %/W
A
= 25 µF, IO = 1.5A
V
= 8.3 ± 3V
I
T
= 25°C f =10Hz to 10KHz 0.003 %
A
O
60 79 dB
S Temperature Stability 0.5 % S Long Term Stability T
= 125°C 1000Hrs 0.5 %
A
NOTE 1: Se e short-cir cuit current curve for avail able outp ut current at fixed dropout .
5/21
LD1086 SERIES
Table 9: Electrical Characteristics Of LD1086#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 (note 1) IO = 0 mA TJ = 25°C 3.564 3.6 3.636 V
O
= 0 to 1.5A VI = 5.2 to 30V 3.528 3.6 3.672 V
I
O
∆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
O
= 0 mA VI = 5.2 to 18V 1 10 mV
I
O
Load Regulation IO = 0 to 1.5A TJ = 25°C 3 15 mV
O
= 0 to 1.5A 7 25 mV
I
O
Dropout Voltage IO = 1.5A 1.3 1.5 V
V
d
I
Quiescent Current VI ≤ 30V 5 10 mA
q
Short Circuit Current VI - VO = 5V 1.5 2 A
I
sc
- VO = 25V 0.05 0.2 A
V
I
Thermal Regulation T
eN RMS Output Noise Voltage
(% of V
)
O
= 25°C, 30ms pulse 0.01 0.04 %/W
A
= 25 µF, IO = 1.5A
V
= 8.6 ± 3V
I
T
= 25°C f =10Hz to 10KHz 0.003 %
A
O
60 78 dB
S Temperature Stability 0.5 % S Long Term Stability TA = 125°C 1000Hrs 0.5 %
NOTE 1: Se e short-cir cuit current curve for avail able outp ut current at fixed dropout .
Table 10: Electrical Characteristics Of LD1086#50 (VI=8V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage (note 1) IO = 0 mA TJ = 25°C 4.95 5 5.05 V
O
I
= 0 to 1.5A VI = 6.6 to 30V 4.9 5 5.1 V
O
∆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
O
= 0 mA VI = 6.6 to 20V 1 10 mV
I
O
Load Regulation IO = 0 to 1.5A TJ = 25°C 5 20 mV
O
I
= 0 to 1.5A 10 35 mV
O
Dropout Voltage IO = 1.5A 1.3 1.5 V
V
d
Quiescent Current VI ≤ 30V 5 10 mA
I
q
Short Circuit Current VI - VO = 5V 1.5 2 A
I
sc
- VO = 25V 0.05 0.2 A
V
I
Thermal Regulation T
eN RMS Output Noise Voltage
(% of V
)
O
= 25°C, 30ms pulse 0.01 0.04 %/W
A
= 25 µF, IO = 1.5A
V
= 10 ± 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
NOTE 1: Se e short-cir cuit current curve for avail able outp ut current at fixed dropout .
6/21
LD1086 SERIES
Table 11: Electrical Characteristics Of LD1086#80 (VI=11V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage (note 1) IO = 0 mA TJ = 25°C 7.92 8 8.08 V
O
= 0 to 1.5A VI = 9.8 to 30V 7.84 8 8.16 V
I
O
∆V
∆V
SVR Supply Voltage Rejection f = 120 Hz, C
Line Regulation IO = 0 mA VI = 9.8 to 20V TJ = 25°C 1 18 mV
O
= 0 mA VI = 9.8 to 20V 2 18 mV
I
O
Load Regulation IO = 0 to 1.5A TJ = 25°C 8 30 mV
O
= 0 to 1.5A 12 60 mV
I
O
Dropout Voltage IO =1.5A 1.3 1.5 V
V
d
I
Quiescent Current VI ≤ 30V 5 10 mA
q
Short Circuit Current VI - VO = 5V 1.5 2 A
I
sc
- VO = 25V 0.04 0.2 A
V
I
Thermal Regulation T
eN RMS Output Noise Voltage
(% of V
)
O
= 25°C, 30ms pulse 0.01 0.04 %/W
A
= 25 µF, IO = 1.5A
V
= 13 ± 3V
I
T
= 25°C f =10Hz to 10KHz 0.003 %
A
O
54 71 dB
S Temperature Stability 0.5 % S Long Term Stability TA = 125°C 1000Hrs 0.5 %
NOTE 1: Se e short-cir cuit current curve for avail able outp ut current at fixed dropout .
Table 12: Electrical Characteristics Of LD1086#90 (VI=12V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage (note 1) IO = 0 mA TJ = 25°C 8.91 9 9.09 V
O
= 0 to 1.5A VI = 11 to 30V 8.82 9 9.18 V
I
O
∆V
∆V
SVR Supply Voltage Rejection f = 120 Hz, C
Line Regulation IO = 0 mA VI = 11 to 20V TJ = 25°C 1 20 mV
O
= 0 mA VI = 11 to 20V 2 20 mV
I
O
Load Regulation IO = 0 to 1.5A TJ = 25°C 8 30 mV
O
= 0 to 1.5A 12 60 mV
I
O
Dropout Voltage IO = 1.5A 1.3 1.5 V
V
d
I
Quiescent Current VI ≤ 30V 5 10 mA
q
Short Circuit Current VI - VO = 5V 1.5 2 A
I
sc
V
- VO = 25V 0.05 0.2 A
I
Thermal Regulation T
eN RMS Output Noise Voltage
(% of V
)
O
= 25°C, 30ms pulse 0.01 0.04 %/W
A
= 25 µF, IO = 1.5A
V
= 14 ± 3V
I
T
= 25°C f =10Hz to 10KHz 0.003 %
A
O
54 70 dB
S Temperature Stability 0.5 % S Long Term Stability TA = 125°C 1000Hrs 0.5 %
NOTE 1: Se e short-cir cuit current curve for avail able outp ut current at fixed dropout .
7/21
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