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LD1085D2M33
Datasheet
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SGS Thomson Microelectronics LD1085V120, LD1085V, LD1085D2T90, LD1085D2T80, LD1085D2T50 Datasheet

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LD1085
SERIES
3A LOW DROP FIXED AND ADJUSTABLE
POSITIVE VOLTAGE REGULATORS
May 2000
BLOCKDIAGRAM
2
PAK
■ TYPICALDROPOUT VOLTAGE1.3V AT3A
■ THREETERMINALADJUSTABLEOR FIXED
OUTPUTVOLATGE1.8V,2.5V,2.85V,3.3V,
3.6V,5V,8V, 9V, 12V
■ GUARANTEEDOUTPUTCURRENTUP TO
3A
■ OUTPUTTOLERANCE±1% AT 25
o
C AND
±2% IN FULLTEMPERATURERANGE
■
INTERNALPOWERAND THERMALLIMIT
■ WIDEOPERATINGTEMPERATURERANGE
-40
o
C TO 125oC
■
PACKAGEAVAILABLE:TO-220D2PAK
■ PINOUTCOMPATIBILITYWITHSTANDARD
ADJUSTABLEVOLTAGEREGULATORS
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 active termination. Unlike 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 10µF minimum capacitor is need for stability. The device is supplied in TO-220, D
2
PAK and D2PAK/A packages. On chip trimming allows the regulator to reach a very tight output voltage tolerance, within±1% at 25
o
C.
TO-220
2
PAK/A
1/15
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
IN
DC InputVoltage 30 V
I
OUT
OutputCurrent Internally Limited mA
P
tot
PowerDissipation Internally Limited mW
T
stg
Storage TemperatureRange -50 to 150
o
C
T
op
OperatingJunction Temperature Range -40 to 125
o
C
Absolute Maximum Ratings are those value beyond which damage to the device may occur. Functional operation under these condition is not implied. Over the above suggested Max Power Dissipation a ShortCircuit could definetively damage the device.
THERMALDATA
Symbol Parameter TO-220 D2PAK Unit
R
thj-cas e
R
thj-amb
Thermal Resistance Junction-case Thermal Resistance Junction-ambient
3
50
3
62.5
o
C/W
o
C/W
APPLICATION CIRCUIT FOR FIXED AND ADJUSTABLE VERSION
CONNECTION DIAGRAM AND ORDERING NUMBERS
(top view)
TO-220 D2PAK (**) D2PAK/A (**) Output Voltage
LD1085V18 LD1085V25 LD1085V28 LD1085V33 LD1085V36 LD1085V50 LD1085V80 LD1085V90 LD1085V120
LD1085D2T18 LD1085D2T25 LD1085D2T28 LD1085D2T33 LD1085D2T36 LD1085D2T50 LD1085D2T80 LD1085D2T90 LD1085D2T120
LD1085D2M18 LD1085D2M25 LD1085D2M28 LD1085D2M33 LD1085D2M36 LD1085D2M50 LD1085D2M80 LD1085D2M90 LD1085D2M120
1.8V
2.5V
2.85V
3.3V
3.6V 5V 8V 9V
12V
LD1085V LD1085D2T LD1085D2M 1.25 to 28V
(**)Available in Tape & Reel with the suffix ”R” for fixed version and ”-R” for adjustable version.
TO-220 D2PAK D2PAK/A
VO=
V
REF
(1 +
R
2
R
1
)
LD1085 SERIES
2/15
ELECTRICAL CHARACTERISTICS FOR LD1085#25
(refer to the test circuits,
T
j
= -40 to 125oC, VIN= 5.5 V, CIN=CO=10µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
O
OutputVoltage IO= 0 mA Tj=25oC 2.475 2.5 2.525 V
V
O
OutputVoltage(Note 1) IO= 0 to3 A Vin=4.1to 30 V 2.45 2.5 2.55 V
∆
V
O
LineRegulation Vin=4.1to 18 V IO= 0 mA Tj=25oC0.25mV
∆
V
O
LineRegulation Vin=4.1to 18 V IO=0mA 0.4 5 mV
∆
V
O
LoadRegulation IO= 0 to3 A Tj=25oC210mV
∆
V
O
LoadRegulation IO= 0 to3 A 4 20 mV
V
d
Dropout Voltage IO=3A 1.3 1.5 V
I
d
QuiescentCurrent Vin≤ 30 V 5 10 mA
I
SC
ShortCircuitCurrent VIN-VO=5V
V
IN-VO
=25V
3.2
0.2
4.5
0.5
A
Thermal Regulation T
a
=25oC 30ms Pulse 0.008 0.04 %/W
SVR Supply VoltageRejection I
O
= 3 A f= 120 Hz CO=25µF
V
in
=7.5±3V
60 72 dB
eN OutputNoise Voltage B = 10Hzto 10KHz T
a
=25oC 0.003 % S Temperature Stability 0.5 % S Long Term Stability 1000 hrs T
a
= 125oC0.5%
Note1: See short-circuit curve for available output current at fixed dropout.
ELECTRICAL CHARACTERISTICS FOR LD1086#18
(refer to the test circuits,
T
j
= -40 to 125oC, VIN= 4.8 V, CIN=CO=10µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
O
OutputVoltage IO= 0 mA Tj=25oC 1.782 1.8 1.818 V
V
O
OutputVoltage(Note 1) IO= 0 to3 A VIN=3.4to 30 V 1.764 1.8 1.836 V
∆
V
O
LineRegulation VIN=3.4 to18V IO= 0 mA Tj=25oC0.24mV
∆
V
O
LineRegulation VIN=3.4 to18V IO=0mA 0.4 4 mV
∆
V
O
LoadRegulation IO= 0 to3 A Tj=25oC210mV
∆
V
O
LoadRegulation IO= 0 to3 A 4 20 mV
V
d
Dropout Voltage IO=3A 1.3 1.5 V
I
d
QuiescentCurrent VIN≤ 30 V 5 10 mA
I
SC
ShortCircuitCurrent VIN-VO=5V
V
IN-VO
=25V
3.2
0.2
4.5
0.5
A
Thermal Regulation T
a
=25oC 30ms Pulse 0.008 0.04 %/W
SVR Supply VoltageRejection I
O
= 3 A f= 120 Hz CO=25µF
V
IN
=5.3±1V
60 75 dB
eN OutputNoise Voltage B = 10Hzto 10KHz T
a
=25oC 0.003 % S Temperature Stability 0.5 % S Long Term Stability 1000 hrs T
a
= 125oC0.5%
Note1: See short-circuit curve for available output current at fixed dropout.
LD1085 SERIES
3/15
ELECTRICAL CHARACTERISTICS FOR LD1085#285
(referto the testcircuits,
T
j
= -40 to 125oC, VIN= 5.85 V, CIN=CO=10µF unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
O
OutputVoltage IO= 0 mA Tj=25oC 2.821 2.85 2. 879 V
V
O
OutputVoltage(Note 1) IO= 0 to3 A VIN=4.5to 30 V 2.793 2.85 2.907 V
∆
V
O
LineRegulation VIN=4.5to 18 V IO= 0 mA Tj=25oC0.26mV
∆
V
O
LineRegulation VIN=4.5to 18 V IO=0mA 0.5 6 mV
∆
V
O
LoadRegulation IO= 0 to3 A Tj=25oC315mV
∆
V
O
LoadRegulation IO= 0 to3 A 7 20 mV
V
d
Dropout Voltage IO=3A 1.3 1.5 V
I
d
QuiescentCurrent VIN≤ 30 V 5 10 mA
I
SC
ShortCircuitCurrent VIN-VO=5V
V
IN-VO
=25V
3.2
0.2
4.5
0.5
A
Thermal Regulation T
a
=25oC 30ms Pulse 0.008 0.04 %/W
SVR Supply VoltageRejection I
O
= 3 A f= 120 Hz CO=25µF
V
IN
=7.85±3V
60 72 dB
eN OutputNoise Voltage B = 10Hzto 10KHz T
a
=25oC 0.003 % S Temperature Stability 0.5 % S Long Term Stability 1000 hrs T
a
= 125oC0.5%
Note1: See short-circuit curve for available output current at fixed dropout.
ELECTRICAL CHARACTERISTICS FOR LD1085#33
(refer to the test circuits,
T
j
= -40 to 125oC, VIN= 6.3 V, CIN=CO=10µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
O
OutputVoltage IO= 0 mA Tj=25oC 3.267 3.3 3.333 V
V
O
OutputVoltage(Note 1) IO= 0 to3 A VIN=4.9to 30 V 3.234 3.3 3.366 V
∆
V
O
LineRegulation VIN=4.9to 18 V IO= 0 mA Tj=25oC0.56mV
∆
V
O
LineRegulation VIN=4.9to 18 V IO=0mA 1 6 mV
∆
V
O
LoadRegulation IO= 0 to3 A Tj=25oC315mV
∆
V
O
LoadRegulation IO= 0 to3 A 7 20 mV
V
d
Dropout Voltage IO=3A 1.3 1.5 V
I
d
QuiescentCurrent VIN≤ 30 V 5 10 mA
I
SC
ShortCircuitCurrent VIN-VO=5V
V
IN-VO
=25V
3.2
0.2
4.5
0.5
A
Thermal Regulation T
a
=25oC 30ms Pulse 0.008 0.04 %/W
SVR Supply VoltageRejection I
O
= 3 A f= 120 Hz CO=25µF
V
IN
=8.3±3V
60 72 dB
eN OutputNoise Voltage B = 10Hzto 10KHz T
a
=25oC 0.003 % S Temperature Stability 0.5 % S Long Term Stability 1000 hrs T
a
= 125oC0.5%
Note1: See short-circuit curve for available output current at fixed dropout.
LD1085 SERIES
4/15
ELECTRICAL CHARACTERISTICS FOR LD1085#36
(refer to the test circuits,
T
j
= -40 to 125oC, VIN= 5.85 V, CIN=CO=10µF unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
O
OutputVoltage IO= 0 mA Tj=25oC 3.564 3.6 3.636 V
V
O
OutputVoltage(Note 1) IO= 0 to3 A VIN=5.2to 30 V 3.528 3.6 3.672 V
∆
V
O
LineRegulation VIN=5.2to 18 V IO= 0 mA Tj=25oC0.510mV
∆
V
O
LineRegulation VIN=5.2to 18 V IO= 0 mA 1 10 mV
∆
V
O
LoadRegulation IO= 0 to3 A Tj=25oC315mV
∆
V
O
LoadRegulation IO= 0 to3 A 7 20 mV
V
d
Dropout Voltage IO=3A 1.3 1.5 V
I
d
QuiescentCurrent VIN≤ 30 V 5 10 mA
I
SC
ShortCircuitCurrent VIN-VO=5V
V
IN-VO
=25V
3.2
0.2
4.5
0.5
A
Thermal Regulation T
a
=25oC 30ms Pulse 0.008 0.04 %/W
SVR Supply VoltageRejection I
O
= 3 A f= 120 Hz CO=25µF
V
IN
=8.6±3V
60 72 dB
eN OutputNoise Voltage B = 10Hzto 10KHz T
a
=25oC 0.003 % S Temperature Stability 0.5 % S Long Term Stability 1000 hrs T
a
= 125oC0.5%
Note1: See short-circuit curve for available output current at fixed dropout.
ELECTRICAL CHARACTERISTICS FOR LD1085#50
(refer to the test circuits,
T
j
= -40 to 125oC, VIN= 8 V, CIN=CO=10µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
O
OutputVoltage IO= 0 mA Tj=25oC4.9555.05V
V
O
OutputVoltage(Note 1) IO= 0 to3 A VIN=6.6to 30 V 4.9 5 5.1 V
∆
V
O
LineRegulation VIN=6.6to 20 V IO= 0 mA Tj=25oC0.510mV
∆
V
O
LineRegulation VIN=6.6to 20 V IO= 0 mA 1 10 mV
∆
V
O
LoadRegulation IO= 0 to3 A Tj=25oC520mV
∆
V
O
LoadRegulation IO= 0 to3A 10 35 m V
V
d
Dropout Voltage IO=3A 1.3 1.5 V
I
d
QuiescentCurrent VIN≤ 30 V 5 10 mA
I
SC
ShortCircuitCurrent VIN-VO=5V
V
IN-VO
=25V
3.2
0.2
4.5
0.5
A
Thermal Regulation T
a
=25oC 30ms Pulse 0.008 0.04 %/W
SVR Supply VoltageRejection I
O
= 3 A f= 120 Hz CO=25µF
V
IN
=10±3V
60 72 dB
eN OutputNoise Voltage B = 10Hzto 10KHz T
a
=25oC 0.003 % S Temperature Stability 0.5 % S Long Term Stability 1000 hrs T
a
= 125oC0.5%
Note1: See short-circuit curve for available output current at fixed dropout.
LD1085 SERIES
5/15
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