LT1085LCC4
MILITARY VERSION
Semelab plc.
Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail:
sales@semelab.co.uk
Website:
http://www.semelab.co.uk
1.39 (0.055)
1.15 (0.045)
0.76 (0.030)
0.51 (0.020)
1.39 (0.055)
1.02 (0.040)
15 16
13
12
14
3
4
5
6
7
17
18
1
2
11
10
8
9
9.14 (0.360)
8.64 (0.340)
1.27 (0.050)
1.07 (0.040)
2.16 (0.085)
7.62 (0.300)
7.12 (0.280)
1.65 (0.065)
1.40 (0.055)
0.33 (0.013)
0.08 (0.003)
0.43 (0.017)
0.18 (0.007
Rad.
Rad.
LCC4
ABSOLUTE MAXIMUM RATINGS
(T
case
= 25C unless otherwise stated)
CERAMIC SURFACE MOUNT
LOW DROPOUT POSITIVE ADJUSTABLE
VOLTAGE REGULATOR
FOR HI-REL APPLICATIONS
V
I-O
InputOutput Differential Voltage
P
D
Power Dissipation
V
IN
Operating Input Voltage
T
J
Operating Junction Temperature Range
Control
Power
T
STG
Storage Temperature Range
JC
Thermal Resistance (junction to case)
30V
Internally limited
25V
55 to 150C
55 to 200C
65 to 150C
13C/W
FEATURES
Ceramic Surface Mount Hermetic Package
Low Dropout Performance
Output Current 3A
Line Regulation 0.015% / V Typical.
Load Regulation 0.1% Typical.
Full Temperature Range (55 to +150C)
IN
V
THERMAL
LIMIT
ADJ
V
OUT
V
* Although the devices' maximum operating voltage is limited to 25V the devices are guaranteed to withstand transient
input voltages up to 30V. For input voltages greater than the maximum operating input voltage, some degradation of
specifications will occur.
BLOCK DIAGRAM
Pads 5,4 = adjust
Pads 6,7,8,9,10,11,13 = Vin
Pads 1,2,15,16,17,18 = Vout
MECHANICAL DATA
Dimensions in mm (inches)
Document Number 3871
Issue 2
Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is
believed to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in
its use. Semelab encourages customers to verify that datasheets are current before placing orders.
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
LT1085LCC4
MILITARY VERSION
Semelab plc.
Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail:
sales@semelab.co.uk
Website:
http://www.semelab.co.uk
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
REG(THERM) Thermal Regulation
RA
Ripple Rejection
IPIN
Adjust Pin Current
IPIN
Adjust Pin Current Change
TS
Temperature Stability
Long Term Stability
VN
RMS Output Noise
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 125C
I
O
= 10mA (V
IN
V
OUT
) = 1.5 to 15V
T
J
= 55 to 125C
I
O
= 10mA (V
IN
V
OUT
) = 15 to 30V
T
J
= 55 to 125C
V
IN
V
OUT
= 3V
I
O
= 10mA to 3A
T
J
= 55 to 125C
V
REF
= 1%
I
OUT
= 3A
T
J
= 55 to 125C
V
IN
V
OUT
= 5V
T
J
= 55 to 125C
V
IN
V
OUT
= 25V
TJ = 55 to 125C
V
IN
V
OUT
= 5V
TJ = 55 to 125C
TP = 30ms
TA = 25C
f = 120Hz
V
IN
V
OUT
= 3V
IO = 3A
CADJ = 25
F
TJ = 55 to 125C
VIN VOUT = 1.5 to 15V
IO = 10mA to 3A
TJ = 55 to 125C
TJ = 55 to 125C
TA = 125C
T = 1000 Hrs
f = 10Hz to 10kHz
TA = 25C
1.238
1.250
1.252
1.225
1.25
1.270
0.015
0.2
0.5
0.1
0.3
0.2
0.4
1.3
1.5
3.2
4
0.2
0.5
5
10
0.004
0.04
60
75
55
120
0.2
5
0.5
0.3
0.003
ELECTRICAL CHARACTERISTICS
(Pre Irradiation)
(T
J
= 25C unless otherwise stated)
V
%
%
V
A
mA
%/W
dB
A
A
%
%
%
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.
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.
Document Number 3871
Issue 2
Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is
believed to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in
its use. Semelab encourages customers to verify that datasheets are current before placing orders.
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