LT1074I Datasheet, PDF (7/16 Pages) Linear Technology – Step-Down Switching Regulator

LT1074/LT1076
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current (Shutdown)
300
250
200
150
100
50
0
0 10 20 30 40 50 60
INPUT VOLTAGE (V)
LT1074•TPC13
Reference Shift with Ripple
Voltage
20
10
0
–10
TRI WAVE
–20
–30
SQUARE
WAVE
–40
–50
–60
–70
–80
0 20 40 60 80 100 120 140 160 180 200
PEAK-TO-PEAK RIPPLE AT FB PIN (mV)
LT1074•TPC16
Reference Voltage vs
Temperature
2.25
2.24
2.23
2.22
2.21
2.20
2.19
2.18
2.17
–50 –25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (°C)
LT1074•TPC14
Error Amplifier Phase and G_M
8k
200
7k
150
6k
θ
100
5k
50
4k
0
G_M
3k
–50
2k
–100
1k
–150
0
–200
1k
10k
100k
1M
10M
FREQUENCY (Hz)
LT1074•TPC17
Switch “On” Voltage
3.0
2.5
T_j = 25°C
2.0
LT1074
1.5
LT1076
1.0
0.5
0
1
2
3
4
SWITCH CURRENT (A)
Switching Frequency vs
Temperature
120
5
6
LT1074•TPC28
115
110
105
100
95
90
85
80
–50 –25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (°C)
LT1074•TPC18
Feedback Pin Frequency Shift
160
140
120
100
80
150°C
60
–55°C
40
25°C
20
0
0 0.5 1.0 1.5 2.0 2.5 3.0
FEEDBACK PIN VOLTAGE (V)
LT1074•TPC19
Current Limit vs Temperature*
8
7
I LIM PIN OPEN
6
5
R LIM = 10kΩ
4
3
R LIM= 5kΩ
2
1
*MULTIPLY CURRENTS BY 0.4 FOR LT1076
0
–50 –25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (°C)
LT1074•TPC22
sn1074 1074fds
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