Datasheet
4
LT1506
TYPICAL PERFORMANCE CHARACTERISTICS
UW
Feedback Pin Voltage
TEMPERATURE (°C)
–50
2.430
2.425
2.420
2.415
2.410
100
1506 G03
–25 0 25 50 75 125
FEEDBACK VOLTAGE (V)
Switch Peak Current Limit
DUTY CYCLE (%)
0
SWITCH PEAK CURRENT (A)
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
80
1506 G02
20
40
60
100
TYPICAL
MINIMUM
Lockout and Shutdown
ThresholdsShutdown Pin Bias Current
Shutdown Supply Current
JUNCTION TEMPERATURE (°C)
–50
2.40
2.36
2.32
0.8
0.4
0
25 75
1506 G05
–25 0
50 100 125
SHUTDOWN PIN VOLTAGE (V)
LOCKOUT
START-UP
SHUTDOWN
INPUT VOLTAGE (V)
0
INPUT SUPPLY CURRENT (µA)
25
20
15
10
5
0
51015
1506 G06
V
SHDN
= 0V
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
1506 G07
V
IN
= 10V
FREQUENCY (Hz)
GAIN (µMho)
PHASE (DEG)
3000
2500
2000
1500
1000
500
200
150
100
50
0
–50
100 10k 100k 10M
1506 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
Error Amplifier Transconductance
JUNCTION TEMPERATURE (°C)
–50
TRANSCONDUCTANCE (µMho)
2500
2000
1500
1000
500
0
0
50
75
1506 G08
–25
25
100
125
Minimum Input Voltage
with 3.3V Output
LOAD CURRENT (mA)
1
4.1
INPUT VOLTAGE (V)
4.3
4.5
4.7
10 100 1000
1506 G12
3.9
3.7
3.5
3.3
TEMPERATURE (°C)
–50
–500
–400
–300
–200
–8
–4
0
25 75
1506 G04
–25 0
50 100 125
CURRENT (µA)
AT 0.37V SHUTDOWN THRESHOLD.
AFTER SHUTDOWN, CURRENT
DROPS TO A FEW µA
AT 2.38V LOCKOUT THRESHOLD