LT1506 Linear Technology, LT1506 Datasheet - Page 4

• Manufacturer Part Number: LT1506
• Description: 4.5A/ 500kHz Step-Down Switching Regulator
• Manufacturer: Linear Technology

LT1506
TYPICAL PERFORMANCE CHARACTERISTICS
4
–500
– 400
– 300
– 200
4.7
4.5
4.3
4.1
3.9
3.7
3.5
3.3
70
60
50
40
30
20
10
– 8
– 4
0
0
–50
0
Shutdown Supply Current
Minimum Input Voltage
with 3.3V Output
1
Shutdown Pin Bias Current
V
IN
–25
= 10V
AT 0.37V SHUTDOWN THRESHOLD.
AT 2.38V LOCKOUT THRESHOLD
AFTER SHUTDOWN, CURRENT
0.1
SHUTDOWN VOLTAGE (V)
TEMPERATURE ( C)
LOAD CURRENT (mA)
DROPS TO A FEW A
0
10
25
0.2
50
100
75
0.3
W
100
1506 G12
1506 G04
1506 G07
U
1000
0.4
125
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
Switch Peak Current Limit
0
Lockout and Shutdown
Thresholds
–25
–25
JUNCTION TEMPERATURE ( C)
JUNCTION TEMPERATURE ( C)
20
0
0
MINIMUM
DUTY CYCLE (%)
25
SHUTDOWN
40
25
START-UP
50
50
LOCKOUT
60
75
75
TYPICAL
100
80
100
1506 G08
1506 G05
1506 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
V
R
25
20
15
10
5
0
FB 2 10
LOAD
– 50
0
Feedback Pin Voltage
Shutdown Supply Current
V
1k
= 50
SHDN
–25
–3
GAIN
FREQUENCY (Hz)
= 0V
PHASE
10k
0
INPUT VOLTAGE (V)
TEMPERATURE ( C)
5
R
200k
25
OUT
100k
50
10
1M
C
12pF
75
OUT
V
1506 G09
C
100
10M
1506 G03
1506 G06
200
150
100
50
0
–50
125
15