Datasheet

4
LTC1474/LTC1475
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Current Trip Threshold vs
Temperature
Switch Resistance vs
Input Voltage
Supply Current in Shutdown
TEMPERATURE (°C)
0
CURRENT TRIP THRESHOLD (mA)
80
1474/75 G04
20
40
60
500
400
300
200
100
0
V
IN
= 10V
R
SENSE
= 0Ω
R
SENSE
= 1.1Ω
INPUT VOLTAGE (V)
0
R
DS(ON)
(Ω)
20
1474/75 G05
5
10
15
5
4
3
2
1
0
T = 70°C
T = 25°C
INPUT VOLTAGE (V)
0
SUPPLY CURRENT (µA)
20
1474/75 G06
5
10
15
10.0
7.5
5.0
2.5
0
Switch Leakage Current vs
Temperature
V
IN
DC Supply Current
Off-Time vs Output Voltage
% OF REGULATED OUTPUT VOLTAGE (%)
0
OFF-TIME (µs)
100
1474/75 G09
20
40
60 80
80
60
40
20
0
V
IN
= 10V
INPUT VOLTAGE (V)
0
SUPPLY CURRENT (µA)
4
8
16 20
1474/75 G08
12
120
100
80
60
40
20
0
ACTIVE MODE
SLEEP MODE
TEMPERATURE (°C)
0
LEAKAGE CURRENT (µA)
1474/75 G07
40 60 80 100
1.0
0.8
0.6
0.4
0.2
0
20
V
IN
= 18V
Efficiency vs Input Voltage Line Regulation
Load Regulation
INPUT VOLTAGE (V)
0
EFFICIENCY (%)
4
8
16
1474/75 G01
12
100
95
90
85
80
75
70
I
LOAD
= 25mA
I
LOAD
= 200mA
FIGURE 1 CIRCUIT
L: CDRH73-101
I
LOAD
= 1mA
INPUT VOLTAGE (V)
0
∆V
OUT
(mV)
4
8
16
1474/75 G02
12
40
30
20
10
0
–10
–20
FIGURE 1 CIRCUIT
I
LOAD
= 100mA
R
SENSE
= 0.33Ω
R
SENSE
= 0Ω
LOAD CURRENT (mA)
0
∆V
OUT
(mV)
40
30
20
10
0
–10
–20
–30
1474/75 G03
100
250
50
150 200 300
FIGURE 1 CIRCUIT
V
IN
= 15V
V
IN
= 10V
V
IN
= 5V