lt1085ct-pbf Linear Technology Corporation, lt1085ct-pbf Datasheet - Page 3

• Manufacturer Part Number: lt1085ct-pbf
• Description: 7.5a, 5a, 3a Low Dropout Positive Adjustable Regulators
• Manufacturer: Linear Technology Corporation

temperature range, otherwise specifications are at T
PARAMETER
Load Regulation
Dropout Voltage
Current Limit
Minimum Load Current
Thermal Regulation
Ripple Rejection
Adjust Pin Current
Adjust Pin Current Change
Temperature Stability
Long Term Stability
RMS Output Noise (% of V
Thermal Resistance Junction-to-Case
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: See thermal regulation specifications for changes in output voltage
due to heating effects. Load and line regulation are measured at a constant
junction temperature by low duty cycle pulse testing.
Note 3: Line and load regulation are guaranteed up to the maximum power
dissapation (60W for the LT1083, 45W for the LT1084 (K, P), 30W for the
LT1084 (T) and 30W for the LT1085). Power dissipation is determined by
the input/output differential and the output current. Guaranteed maximum
power dissipation will not be available over the full input/output voltage
range.
ELECTRICAL CHARACTERISTICS
LT1083
LT1084
LT1085
LT1083
LT1084
LT1085
LT1083
LT1084
LT1085
OUT
)
CONDITIONS
(V
10mA ≤ I
T
ΔV
(V
(V
(V
(V
(V
(V
(V
T
f = 120Hz, C
I
T
10mA ≤ I
1.5V ≤ (V
T
T
10Hz = ≤ f ≤ 10kHz
Control Circuitry/Power Transistor
OUT
J
A
J
A
A
IN
IN
IN
IN
IN
IN
IN
IN
= 25°C (Notes 2, 3, 4, 6)
= 25°C
REF
= 25°C, 30ms Pulse
= 125°C, 1000 Hrs
= 25°C
K Package
P Package
K Package
P Package
T Package
K Package
M, T Packages
– V
– V
– V
– V
– V
– V
– V
– V
= I
= 1%, I
FULL LOAD
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
IN
) = 3V
) = 5V
) = 25V
) = 5V
) = 25V
) = 5V
) = 25V
) = 25V
– V
ADJ
≤ I
≤ I
OUT
OUT
FULL LOAD
= 25μF, C
FULL LOAD
, (V
A
= I
) ≤ 25V (Note 6)
= 25°C.
IN
FULLLOAD
– V
The
OUT
OUT
) = 3V (Notes 6, 7, 8)
●
= 25μF Tantalum
(Notes 5, 6, 8)
denotes the specifications which apply over the full operating
Note 4: I
curve is defined as the minimum value of current limit as a function of
input-to-output voltage. Note that the 60W power dissipation for the
LT1083 (45W for the LT1084 (K, P), 30W for the LT1084 (T), 30W for the
LT1085) is only achievable over a limited range of input-to-output voltage.
Note 5: Dropout voltage is specified over the full output current range of
the device. Test points and limits are shown on the Dropout Voltage
curve.
Note 6: For LT1083 I
T
Note 7: 1.7V ≤ (V
Note 8: Dropout is 1.7V maximum for LT1084 at – 55°C ≤ T
J
≥ –40°C.
FULL LOAD
IN
is defined in the current limit curves. The I
– V
FULL LOAD
LT1083/LT1084/LT1085
OUT
) ≤ 25V for LT1084 at – 55°C ≤ T
is 5A for – 55°C ≤ T
●
●
●
●
●
●
●
●
●
●
●
●
●
MIN
8.0
0.4
5.5
0.3
3.2
0.2
60
0.002
0.003
0.004
0.003
TYP
0.1
0.2
1.3
9.5
1.0
6.5
0.6
4.0
0.5
0.2
0.5
0.3
75
55
5
J
< – 40°C and 7.5A for
0.75/2.3
0.65/2.3
0.65/2.7
0.6/1.6
0.5/1.6
0.9/3.0
0.7/3.0
0.010
0.015
0.020
MAX
120
0.3
0.4
1.5
10
5
1
J
J
FULLLOAD
≤ – 40°C.
≤ – 40°C.
108345ff
UNITS
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
3
%/W
%/W
%/W
mA
dB
μA
μA
μA
%
%
%
%
%
V
A
A
A
A
A
A