Datasheet

LTC3838-1
8
38381f
For more information www.linear.com/3838-1
TYPICAL PERFORMANCE CHARACTERISTICS
CLKOUT/Switching Frequency
vs Input Voltage
Output Regulation
vs Input Voltage
Error Amplifier Transconductance
vs Temperature
Output Regulation
vs Load Current
Output Regulation
vs Temperature
V
IN
(V)
0
–0.2
NORMALIZED ∆V
OUT
(%)
–0.1
0
0.1
0.2
5 10 15 20
38381 G18
25 30 35 40
V
OUT
= 0.6V
I
LOAD
= 5A
V
OUT
NORMALIZED AT V
IN
= 15V
I
LOAD
(A)
0
NORMALIZED ∆V
OUT
(%)
0
0.1
8
38381 G19
–0.1
–0.2
2
4
6
10
0.2
V
IN
= 15V
V
OUT
= 0.6V
V
OUT
NORMALIZED AT I
LOAD
= 4A
TEMPERATURE (°C)
–50
–0.6
NORMALIZED ∆V
OUT
(%)
–0.4
–0.2
0
0.2
0 50
100
150
38381 G20
0.4
0.6
–25 25
75
125
V
IN
= 15V
V
OUT
= 0.6V
I
LOAD
= 0A
V
OUT
NORMALIZED AT T
A
= 25°C
V
IN
(V)
0
–2
NORMALIZED ∆f
(%)
–1
0
1
2
5 10 15 20
38381 G21
25 30 35 40
V
OUT
= 0.6V
I
LOAD
= 5A
f = 500kHz
FREQUENCY NORMALIZED AT V
IN
= 15V
TEMPERATURE (°C)
–50
1.50
TRANSCONDUCTANCE (mS)
1.55
1.60
1.65
1.70
0 50
100
150
38381 G27
1.75
1.80
–25 25
75
125
CLKOUT/Switching Frequency
vs Temperature
TEMPERATURE (°C)
–50
–2
NORMALIZED ∆f
(%)
–1
0
1
2
–25 0 25 50
38381 G23
75 100 125 150
V
IN
= 15V, V
OUT
= 0.6V
I
LOAD
= 0A
f = 500kHz
FREQUENCY NORMALIZED AT T
A
= 25°C
t
ON(MIN)
and t
OFF(MIN)
vs V
OUT
(Voltage on SENSE
–
Pin)
t
ON(MIN)
and t
OFF(MIN)
vs Voltage on V
IN
Pin
t
ON(MIN)
and t
OFF(MIN)
vs Switching Frequency
V
SENSE
–
(V)
0
0
TIME (ns)
20
40
60
1
2
3 4
38381 G24
5
80
100
10
30
50
70
90
6
V
IN
= 38V
R
T
ADJUSTED FOR f
CLKOUT
= 2MHz
t
OFF(MIN)
t
ON(MIN)
V
IN
(V)
0
0
TIME (ns)
20
40
60
5
10
15 20
38381 G25
353025
80
100
10
30
50
70
90
40
V
OUT
= 0.6V
R
T
ADJUSTED FOR f
CLKOUT
= 2MHz
t
OFF(MIN)
t
ON(MIN)
CLKOUT/SWITCHING FREQUENCY (kHz)
200
0
TIME (ns)
20
40
60
500
800
1100 1400
38381 G26
1700
80
100
10
30
50
70
90
2000
V
IN
= 38V
V
OUT
= 0.6V
t
OFF(MIN)
t
ON(MIN)