LT1074 Linear Technology, LT1074 Datasheet - Page 7

• Manufacturer Part Number: LT1074
• Description: Step-Down Switching Regulator
• Manufacturer: Linear Technology

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