LT1507 Linear Technology, LT1507 Datasheet - Page 4

• Manufacturer Part Number: LT1507
• Description: 500kHz Monolithic Buck Mode Switching Regulator
• Manufacturer: Linear Technology

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