LT1085LCC4 Datasheet, PDF (2/2 Pages) Seme LAB – CERAMIC SURFACE MOUNT LOW DROPOUT POSITIVE ADJUSTABLE VOLTAGE REGULATOR FOR HI-REL APPLICATIONS

LT1085LCC4
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.
ELECTRICAL CHARACTERISTICS (Pre Irradiation) (T_J = 25°C unless otherwise stated)
Parameter
Test Conditions
Min. Typ. Max.
V_REF
Reference Voltage
REG_(LINE) Line Regulation
REG_(LOAD) Load Regulation
See notes 1,2
V_D
Dropout Voltage
See note 3
I_CL
Current Limit
IQ
Quiescent Current
Minimum Load Current ⁴
V_IN – V_OUT = 3V
I_O = 10mA
V_IN – V_OUT = 1.5 to 15V I_O = 10mA to 3A
T_J = –55 to 125°C
I_O = 10mA (V_IN–V_OUT) = 1.5 to 15V
T_J = –55 to 125°C
I_O = 10mA (V_IN–V_OUT) = 15 to 30V
T_J = –55 to 125°C
V_IN – V_OUT = 3V
I_O = 10mA to 3A
DV_REF = 1%
T_J = –55 to 125°C
I_OUT = 3A
T_J = –55 to 125°C
V_IN – V_OUT = 5V
T_J = –55 to 125°C
V_IN – V_OUT = 25V
TJ = –55 to 125°C
V_IN – V_OUT = 5V
TJ = –55 to 125°C
1.238
1.225
3.2
0.2
1.250
1.25
0.015
0.1
0.2
1.3
4
0.5
5
1.252
1.270
0.2
0.5
0.3
0.4
1.5
10
REG(THERM) Thermal Regulation TP = 30ms
TA = 25°C
RA
Ripple Rejection
f = 120Hz
IO = 3A
V_IN – V_OUT = 3V
CADJ = 25mF
60
IPIN Adjust Pin Current
TJ = –55 to 125°C
DIPIN
Adjust Pin Current Change ^{VIN – VOUT = 1.5 to 15V}
IO = 10mA to 3A
TJ = –55 to 125°C
TS
Temperature Stability
TJ = –55 to 125°C
Long Term Stability
TA = 125°C
T = 1000 Hrs
VN
RMS Output Noise
f = 10Hz to 10kHz
TA = 25°C
0.004 0.02
75
55
120
0.2
5
0.5
0.3
0.003
Unit
V
%
%
V
A
mA
%/W
dB
mA
mA
%
%
%
Notes:
1 Load and line regulation are measured at a constant junction temperature by low duty cycle pulse testing.
2 Power dissipation is determined by the input - output differential and the output current. Guaranteed maximum power
2 dissipation will not be available over the full input - output voltage range.
3 Dropout voltage is specified over the full output current range of the device.
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Prelim. 8/00