LT1085-12-220M Seme LAB, LT1085-12-220M Datasheet - Page 2

• Manufacturer Part Number: LT1085-12-220M
• Description: LOW DROPOUT 3 AMP POSITIVE VOLTAGE REGULATOR
• Manufacturer: Seme LAB

DESCRIPTION
designed to operate down to 1V input to output differential and the dropout voltage is fully specified as a function of load
current. Dropout is guaranteed at a maximum of 1.5V at maximum output current, decreasing at lower load currents.
On-chip trimming adjusts the reference output voltage to 1%. Current limit is also trimmed, minimising the stress on both
the regulator and power source circuitry under overload conditions.
new devices; however, this is usually included in most regulator designs.
current flows into the load, increasing efficiency.
ELECTRICAL CHARACTERISTICS
Semelab plc.
V
V
REG
REG
V
The LT1085 is designed to provide 3A with higher efficiency than currently available devices. All internal circuitry is
The LT1085 is pin compatible with older 3 terminal adjustable regulators. A 10
Unlike PNP regulators, where up to 10% of the output current is wasted as quiescent current, the LT1085 quiescent
O
REF
D
(LINE)
(LOAD)
Parameter
Output Voltage
Reference Voltage
Line Regulation
Load Regulation
See notes 1,2
Dropout Voltage
See note 3
Telephone [phone]. Fax [phone].
E-mail:
[e-mail]
Voltage Test Conditions
Output
ADJ.
ADJ.
ADJ.
ADJ.
12
12
12
12
5
5
5
5
Website:
V
T
V
T
V
T
V
I
V
I
V
I
V
I
V
I
V
I
D
I
D
I
D
I
O
O
LOAD
O
O
O
OUT
OUT
OUT
J
J
J
V
V
V
IN
IN
IN
IN
IN
IN
IN
IN
IN
= 0
= 0
= 0 to 3A
= 0 to 3A
= 10mA to 3A
= –55 to 150°C
= –55 to 150°C
= –55 to 150°C
OUT
OUT
REF
= 6.5 to 20V
= 13.5V to 25V
– V
= 6.5 to 20V
= 13.5 to 25V
– V
= 8V
= 15V
– V
= 3A
= 3A
= 3A
(T
= 10mA
= 1%
= 50mV
= 120mV
OUT
OUT
OUT
J
http://www.semelab.co.uk
= 25°C unless otherwise stated)
= 1.5 to 15V
= 1.5 to 15V
= 3V
I
I
I
T
T
T
T
T
T
T
T
T
O
O
O
J
J
J
J
J
J
J
J
J
= 0 to 3A
= 0 to 3A
= 10mA to 3A
= –55 to 150°C
= –55 to 150°C
= –55 to 150°C
= –55 to 150°C
= –55 to 150°C
= –55 to 150°C
= –55 to 150°C
= –55 to 150°C
= –55 to 150°C
m
F output capacitor is required on these
LT1085–220M–05
LT1085–05–220M
LT1085–12–220M
MILITARY VERSION
11.76
1.225
Min.
4.90
0.015
0.035
Typ. Max.
1.25
0.5
0.1
0.2
1.3
1.3
1.3
12
10
12
24
5
1
1
2
5
12.24
1.270
Prelim. 10/95
5.10
0.2
0.2
0.3
0.4
1.5
1.5
1.5
10
10
25
25
20
35
36
72
Unit
mV
mV
%
%
V
V