Datasheet

LT1074/LT1076
7
1074fd
Reference Shift with Ripple
Voltage
Feedback Pin Frequency Shift
Supply Current (Shutdown)
Reference Voltage vs
Temperature Switch “On” Voltage
Error Amplifier Phase and G
M
Switching Frequency vs
Temperature
Current Limit vs Temperature*
TYPICAL PERFOR A CE CHARACTERISTICS
UW
INPUT VOLTAGE (V)
0
0
INPUT CURRENT (µA)
50
100
150
200
250
300
30 50 60
LT1074•TPC13
10 20 40
JUNCTION TEMPERATURE (°C)
–50
2.19
VOLTAGE (V)
2.20
2.21
2.22
2.23
2.24
2.25
–25 0 25 50
LT1074•TPC14
2.18
2.17
75 100 125 150
0
“ON” VOLTAGE (V)
3.0
2.5
2.0
1.5
1.0
0.5
123
LT1074•TPC28
4 56
SWITCH CURRENT (A)
T = 25°C
j
LT1074
LT1076
SQUARE
WAVE
PEAK-TO-PEAK RIPPLE AT FB PIN (mV)
0
–80
CHANGE IN REFERENCE VOLTAGE (mV)
–70
–60
–50
–40
–30
20
20 40 60 80
LT1074•TPC16
100 120
140
160 180 200
–20
–10
0
10
TRI WAVE
FREQUENCY (Hz)
(µmho)
8k
1k 100k 1M 10M
0
10k
TRANSCONDUCTANCE
1k
2k
3k
4k
5k
6k
7k
200
150
100
50
0
–50
PHASE (°)
θ
M
G
–100
–150
–200
LT1074•TPC17
JUNCTION TEMPERATURE (°C)
–50
80
FREQUENCY (kHz)
95
100
105
110
115
120
–25 0 25 50
LT1074•TPC18
90
85
75
100
125
150
FEEDBACK PIN VOLTAGE (V)
0
0
SWITCHING FREQUENCY (kHz)
1.0 1.5 3.0
LT1074•TPC19
0.5 2.0 2.5
20
160
40
60
80
100
120
140
–55°C
25°C
150°C
JUNCTION TEMPERATURE (°C)
1
2
3
4
5
6
7
LT1074•TPC22
8
0
–50 –25 0 25 50
75
100
125
150
OUTPUT CURRENT LIMIT (A)
*MULTIPLY CURRENTS BY 0.4 FOR LT1076
I PIN OPEN
LIM
R = 10kΩ
LIM
R = 5kΩ
LIM