LT1083_05 Datasheet, PDF (3/16 Pages) Linear Technology – 7.5A, 5A, 3A Low Dropout Positive Adjustable Regulators

LT1083/LT1084/LT1085
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C.
PARAMETER
Load Regulation
Dropout Voltage
Current Limit
LT1083
LT1084
LT1085
Minimum Load Current
Thermal Regulation
LT1083
LT1084
LT1085
Ripple Rejection
Adjust Pin Current
Adjust Pin Current Change
Temperature Stability
Long Term Stability
RMS Output Noise (% of V_OUT)
Thermal Resistance Junction-to-Case
LT1083
LT1084
LT1085
CONDITIONS
(V_IN – V_OUT) = 3V
10mA ≤ I_OUT ≤ I_{FULL LOAD}
T_J = 25°C (Notes 2, 3, 4, 6)
∆V_REF = 1%, I_OUT = I_FULLLOAD (Notes 5, 6, 8)
(V_IN – V_OUT) = 5V
(V_IN – V_OUT) = 25V
(V_IN – V_OUT) = 5V
(V_IN – V_OUT) = 25V
(V_IN – V_OUT) = 5V
(V_IN – V_OUT) = 25V
(V_IN – V_OUT) = 25V
T_A = 25°C, 30ms Pulse
f = 120Hz, C_ADJ = 25µF, C_OUT = 25µF Tantalum
I_OUT = I_{FULL LOAD}, (V_IN – V_OUT) = 3V (Notes 6, 7, 8)
T_J = 25°C
10mA ≤ I_OUT ≤ I_{FULL LOAD}
1.5V ≤ (V_IN – V_OUT) ≤ 25V (Note 6)
T_A = 125°C, 1000 Hrs
T_A = 25°C
10Hz = ≤ f ≤ 10kHz
Control Circuitry/Power Transistor
K Package
P Package
K Package
P Package
T Package
K Package
M, T Packages
MIN TYP MAX
UNITS
0.1 0.3
%
●
0.2 0.4
%
●
1.3 1.5
V
● 8.0 9.5
A
● 0.4 1.0
A
● 5.5 6.5
A
● 0.3 0.6
A
● 3.2 4.0
A
● 0.2 0.5
A
●
5
10
mA
0.002 0.010
%/W
0.003 0.015
%/W
0.004 0.020
%/W
● 60 75
dB
55
µA
●
120
µA
●
0.2 5
µA
●
0.5
%
0.3 1
%
0.003
%
0.6/1.6
°C/W
0.5/1.6
°C/W
0.75/2.3 °C/W
0.65/2.3 °C/W
0.65/2.7 °C/W
0.9/3.0
°C/W
0.7/3.0
°C/W
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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.
Note 4: I_{FULL LOAD} is defined in the current limit curves. The I_FULLLOAD
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_{FULL LOAD} is 5A for – 55°C ≤ T_J < – 40°C and 7.5A for
T_J ≥ –40°C.
Note 7: 1.7V ≤ (V_IN – V_OUT) ≤ 25V for LT1084 at – 55°C ≤ T_J ≤ – 40°C.
Note 8: Dropout is 1.7V maximum for LT1084 at – 55°C ≤ T_J ≤ – 40°C.
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