LT138AK View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LT138AK Datasheet PDF : 12 Pages
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LT138A/LT338A
LM138/LM338
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 2)
SYMBOL PARAMETER
CONDITIONS
LT138A
MIN TYP MAX
LM138
MIN TYP MAX
ISC
Current Limit
(VIN – VOUT) ≤ 10V
DC
0.5ms Peak
q5
8
q6
12
5
8
6
12
∆VOUT
∆Temp
∆VOUT
∆Time
Temperature Stability
Long-Term Stability
(VIN – VOUT) = 30V, TJ = 25°C
q
TA = 125°C, 1000 Hours
1
2
1
2
0.3 1
1
1
0.3 1
en
RMS Output Noise (% of VOUT) 10Hz ≤ f ≤ 10kHz
θJC
Thermal Resistance
Junction-to-Case
K Package
0.001
1
0.003
1
UNITS
A
A
A
%
%
%
°C/W
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 2)
SYMBOL PARAMETER
CONDITIONS
LT338A
MIN TYP MAX
LM338
MIN TYP MAX
UNITS
VREF
Reference Voltage
∆VOUT
∆VIN
∆VOUT
∆IOUT
Line Regulation
Load Regulation
Thermal Regulation
IOUT = 10mA
1.238 1.250 1.262
V
3V ≤ (VIN – VOUT) ≤ 35V,
q 1.225 1.250 1.270 1.19 1.24 1.29
V
10mA ≤ IOUT ≤ 5A, P ≤ 50W
3V ≤ (VIN – VOUT) ≤ 35V, (Note 3)
q
0.005 0.01
0.02 0.04
0.005 0.03
%/V
0.02 0.06
%/V
10mA ≤ IOUT ≤ 5A, (Note 3)
VOUT ≤ 5V
VOUT ≥ 5V
VOUT ≤ 5V
q
VOUT ≥ 5V
q
20ms Pulse
5
15
0.1 0.3
20 30
0.3 0.6
0.002 0.02
5
25
mV
0.1 0.5
%
20 50
mV
0.3 1
%
0.002 0.02
%/W
IADJ
∆IADJ
ISC
Ripple Rejection
Adjust Pin Current
Adjust Pin Current Change
Minimum Load Current
Current Limit
VOUT = 10V, f = 120Hz
CADJ = 0µF
CADJ = 10µF
10mA ≤ IOUT ≤ 5A,
3V ≤ (VIN – VOUT) ≤ 35V
(VIN – VOUT) = 35V
(VIN – VOUT) ≤ 10V
DC
0.5ms Peak
q
60
60
dB
q 60 75
60 75
dB
q
45 100
45 100
µA
q
0.2 5
0.2 5
µA
q
3.5 10
3.5 10
mA
q5
8
5
8
A
q6
12
6
12
A
∆VOUT
∆Temp
∆VOUT
∆Time
Temperature Stability
Long-Term Stability
(VIN – VOUT) = 30V, TJ = 25°C
q
TA = 125°C, 1000 Hours
1
2
1
2
0.3 1
1
A
1
%
0.3 1
%
en
RMS Output Noise (% of VOUT) 10Hz ≤ f ≤ 10kHz
θJC
Thermal Resistance
Junction-to-Case
K Package
0.001
1
0.003
%
1
°C/W
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: Unless otherwise specified, these specifications apply:
VIN – VOUT = 5V and IOUT = 2.5A. These specifications are applicable for
power dissipations up to 50W.
Note 3: 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.
138afb
3
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