LT1374C Linear Technology, LT1374C Datasheet - Page 4

• Manufacturer Part Number: LT1374C
• Description: 4.5A/ 500kHz Step-Down Switching Regulator
• Manufacturer: Linear Technology

LT1374
TYPICAL PERFORMANCE CHARACTERISTICS
4
500
450
400
350
300
250
200
150
100
500
400
300
200
50
70
60
50
40
30
20
10
8
4
0
0
0
–50
0
0
Switch Voltage Drop
Shutdown Pin Bias Current
Shutdown Supply Current
CURRENT REQUIRED TO FORCE SHUTDOWN
(FLOWS OUT OF PIN). AFTER SHUTDOWN,
CURRENT DROPS TO A FEW A
–25
AT 2.38V STANDBY THRESHOLD
(CURRENT FLOWS OUT OF PIN)
1
0.1
SHUTDOWN VOLTAGE (V)
SWITCH CURRENT (A)
0
TEMPERATURE ( C)
V
IN
2
25
= 25V
0.2
50
3
125 C
25 C
75
V
0.3
IN
– 40 C
W
= 10V
4
100
1374 G18
1374 G04
1374 G07
U
125
0.4
5
2500
2000
1500
1000
500
2.40
2.36
2.32
0
0.8
0.4
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
–50
0
Error Amplifier Transconductance
–50
0
Standby and Shutdown Thresholds
Switch Peak Current Limit
–25
–25
JUNCTION TEMPERATURE ( C)
20
JUNCTION TEMPERATURE ( C)
0
0
MINIMUM
DUTY CYCLE (%)
SHUTDOWN
25
40
25
START-UP
50
STANDBY
50
60
75
75
TYPICAL
100
80
100
1374 G08
1374 G05
1374 G02
125
100
125
3000
2500
2000
1500
1000
500
100
2.430
2.425
2.420
2.415
2.410
Error Amplifier Transconductance
ERROR AMPLIFIER EQUIVALENT CIRCUIT
25
20
15
10
V
R
5
0
FB 2 10
LOAD
– 50
0
Feedback Pin Voltage
Shutdown Supply Current
V
1k
= 50
SHDN
–25
–3
GAIN
5
FREQUENCY (Hz)
= 0V
PHASE
10k
0
TEMPERATURE ( C)
INPUT VOLTAGE (V)
10
R
200k
25
OUT
100k
50
15
1M
C
12pF
75
OUT
V
1374 G09
C
20
100
10M
1374 G03
1374 G06
200
150
100
50
0
–50
125
25