LT1085220M05 Datasheet, PDF (2/3 Pages) Seme LAB – LOW DROPOUT 3 AMP POSITIVE VOLTAGE REGULATOR

LT1085–220M–05
LT1085–05–220M
LT1085–12–220M
MILITARY VERSION
DESCRIPTION
The LT1085 is designed to provide 3A with higher efficiency than currently available devices. All internal circuitry is
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.
The LT1085 is pin compatible with older 3 terminal adjustable regulators. A 10mF output capacitor is required on these
new devices; however, this is usually included in most regulator designs.
Unlike PNP regulators, where up to 10% of the output current is wasted as quiescent current, the LT1085 quiescent
current flows into the load, increasing efficiency.
ELECTRICAL CHARACTERISTICS (T_J = 25°C unless otherwise stated)
Parameter
Output
Voltage Test Conditions
V_O
Output Voltage
5
V_IN = 6.5 to 20V
T_J = –55 to 150°C
12
V_IN = 13.5V to 25V
T_J = –55 to 150°C
I_O = 0 to 3A
I_O = 0 to 3A
V_REF
Reference Voltage
ADJ.
V_IN – V_OUT = 1.5 to 15V I_O = 10mA to 3A
T_J = –55 to 150°C
5
V_IN = 6.5 to 20V
I_O = 0
T_J = –55 to 150°C
REG_(LINE) Line Regulation
12
V_IN = 13.5 to 25V
I_O = 0
T_J = –55 to 150°C
ADJ.
V_IN – V_OUT = 1.5 to 15V
I_LOAD = 10mA
T_J = –55 to 150°C
5
V_IN = 8V
I_O = 0 to 3A
T_J = –55 to 150°C
REG_(LOAD) Load Regulation
12
V_IN = 15V
I_O = 0 to 3A
T_J = –55 to 150°C
See notes 1,2
V_D
Dropout Voltage
See note 3
ADJ.
5
12
ADJ.
V_IN – V_OUT = 3V
I_O = 10mA to 3A
DV_OUT = 50mV
I_OUT = 3A
DV_OUT = 120mV
I_OUT = 3A
DV_REF = 1%
I_OUT = 3A
T_J = –55 to 150°C
T_J = –55 to 150°C
T_J = –55 to 150°C
T_J = –55 to 150°C
Min. Typ. Max. Unit
4.90 5 5.10
11.76 12 12.24 V
1.225 1.25 1.270
0.5 10
1
10
mV
1
25
2
25
0.015 0.2
%
0.035 0.2
5
20
10
35
mV
12
36
24
72
0.1 0.3
%
0.2 0.4
1.3 1.5
1.3 1.5 V
1.3 1.5
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Prelim. 10/95