Datasheet

5
LT1374
1374fd
FEEDBACK PIN VOLTAGE (V)
0
SWITCHING FREQUENCY (kHz) OR CURRENT (µA)
500
400
300
200
100
0
2.0
1374 G10
0.5
1.0
1.5
2.5
SWITCHING
FREQUENCY
FEEDBACK PIN
CURRENT
Frequency Foldback
LOAD CURRENT (mA)
1
5.8
INPUT VOLTAGE (V)
6.0
6.2
6.4
10 100 1000
1374 G12
5.6
5.4
5.2
5.0
MINIMUM
RUNNING
VOLTAGE
MINIMUM
STARTING
VOLTAGE
Minimum Input Voltage
with 5V Output
TEMPERATURE (°C)
–50
550
540
530
520
510
500
490
480
470
460
450
100
1374 G11
–25 0 25 50 75 125
FREQUENCY (kHz)
Switching Frequency
Maximum Load Current
at V
OUT
= 10V
INPUT VOLTAGE (V)
0
CURRENT (A)
4.5
4.0
3.5
3.0
5101520
1374 G13
25
L = 20µH
L = 10µH
L = 5µH
V
OUT
= 10V
Maximum Load Current
at V
OUT
= 3.3V
INPUT VOLTAGE (V)
0
CURRENT (A)
4.5
4.0
3.5
3.0
5101520
1374 G14
25
L = 20µH
L = 10µH
L = 5µH
V
OUT
= 3.3V
Maximum Load Current
at V
OUT
= 5V
INPUT VOLTAGE (V)
0
CURRENT (A)
4.5
4.0
3.5
3.0
5101520
1374 G15
25
L = 20µH
L = 10µH
L = 5µH
V
OUT
= 5V
Shutdown Supply Current
SHUTDOWN VOLTAGE (V)
0
INPUT SUPPLY CURRENT (µA)
70
60
50
40
30
20
10
0
0.1 0.2 0.3 0.4
1374 G07
V
IN
= 25V
V
IN
= 10V
Error Amplifier Transconductance
FREQUENCY (Hz)
GAIN (µMho)
PHASE (DEG)
3000
2500
2000
1500
1000
500
200
150
100
50
0
–50
100 10k 100k 10M
1374 G09
1k 1M
GAIN
PHASE
ERROR AMPLIFIER EQUIVALENT CIRCUIT
R
OUT
200k
C
OUT
12pF
V
C
R
LOAD
= 50Ω
V
FB
2 × 10
–3
)(
Error Amplifier Transconductance
JUNCTION TEMPERATURE (°C)
–50
TRANSCONDUCTANCE (µMho)
2500
2000
1500
1000
500
0
0
50
75
1374 G08
–25
25
100
125
TYPICAL PERFOR A CE CHARACTERISTICS
UW