LT1507
TYPICAL PERFORMANCE CHARACTERISTICS
Shutdown Pin Bias Current
500
400
300
200
8
4
0
–50 –25
CURRENT REQUIRED TO FORCE SHUTDOWN
(FLOWS OUT OF PIN). AFTER SHUTDOWN,
CURRENT DROPS TO A FEW
µA
2.40
STANDBY
2.36
INPUT SUPPLY CURRENT (µA)
SHUTDOWN PIN VOLTAGE (V)
CURRENT (µA)
AT 2.38V STANDBY THRESHOLD
(CURRENT FLOWS OUT OF PIN)
50
25
75
0
TEMPERATURE (°C)
Shutdown Supply Current
150
125
100
75
50
25
0
V
IN
= 10V
2500
INPUT SUPPLY CURRENT (µA)
TRANSCONDUCTANCE (µmho)
GAIN (µmho)
0
0.1
0.2
0.3
0.4
SHUTDOWN VOLTAGE (V)
Frequency Foldback
SWITCHING FREQUENCY (kHz) OR CURRENT (µA)
500
400
300
INPUT VOLTAGE (V)
FREQUENCY (kHz)
SWITCHING
FREQUENCY
200
100
FEEDBACK PIN
CURRENT
0
0
0.5
1.5
2.0
1.0
FEEDBACK PIN VOLTAGE (V)
2.5
4
U W
100
L11507 • TPC04
LT1507 • TPC07
LT1507 • TPC10
Standby and Shutdown Thresholds
30
Shutdown Supply Current
V
SHDN
= 0V
25
20
15
10
5
0
2.32
0.8
STARTUP
0.4
SHUTDOWN
125
0
50
100
25
75
–50 –25
0
JUNCTION TEMPERATURE (°C)
125
0
3
6
9
INPUT VOLTAGE (V)
12
15
LT1507 • TPC05
LT1507 • TPC06
Error Amplifier Transconductance
3000
Error Amplifier Transconductance
200
PHASE
2000
2500
GAIN
150
PHASE (DEG)
1500
2000
100
R
OUT
200k
V
C
C
OUT
12pF
1000
1500
V
FB
×
2e
–3
50
500
1000
ERROR AMPLIFIER EQUIVALENT CIRCUIT
0
R
LOAD
= 50Ω
0.5
0
50
0
75 100
25
–50 –25
JUNCTION TEMPERATURE (°C)
125
500
100
1k
10k
100k
FREQUENCY (Hz)
1M
–50
10M
LT1507 • TPC08
LT1507 • TPC09
Switching Frequency
600
6.5
6.0
550
5.5
5.0
4.5
4.0
3.5
400
–50
3.0
–25
100
JUNCTION TEMPERATURE (°C)
0
25
50
75
125
Minimum Input Voltage
with 3.3V Output
MINIMUM VOLTAGE
TO START WITH
STANDARD CIRCUIT
500
450
MINIMUM VOLTAGE
TO RUN WITH
STANDARD CIRCUIT
1
10
100
LOAD CURRENT (mA)
1000
LT1507 • TPC12
LT1507 • TPC11
MINIMUM INPUT VOLTAGE CAN BE REDUCED
BY ADDING A SMALL EXTERNAL PNP. SEE
APPLICATIONS INFORMATION
LINER [ LINEAR TECHNOLOGY ]
