Datasheet

LTC3642
4
3642fc
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current Line Regulation Load Regulation
Feedback Comparator Voltage
vs Temperature
Feedback Comparator Hysteresis
Voltage vs Temperature
Peak Current Trip Threshold
vs Temperature and I
SET
Peak Current Trip Threshold
vs R
ISET
Quiescent Supply Current
vs Input Voltage
Quiescent Supply Current
vs Temperature
INPUT VOLTAGE (V)
5
–0.30
∆V
OUT
/V
OUT
(%)
–0.20
–0.10
0
0.10
15 25
35
45
3642 G02
0.20
0.30
10 20
30
40
I
LOAD
= 25mA
FIGURE 11 CIRCUIT
LOAD CURRENT (mA)
0
OUTPUT VOLTAGE (V)
5.01
5.03
5.05
40
3642 G03
4.99
4.97
5.00
5.02
5.04
4.98
4.96
4.95
10
20
30
50
V
IN
= 10V
FIGURE 11 CIRCUIT
I
SET
OPEN
TEMPERATURE (°C)
–40
4.4
FEEDBACK COMPARATOR HYSTERESIS (mV)
4.6
4.8
5.0
5.2
5.6
–10
20 50 80
3642 G05
110
5.4
V
IN
= 10V
TEMPERATURE (°C)
–40
0
PEAK CURRENT TRIP THRESHOLD (mA)
20
10
30
50
40
70
60
80
90
–10 20 8050
3642 G06
110
130
120
110
100
I
SET
OPEN
I
SET
= GND
R
ISET
= 500k
V
IN
= 10V
R
SET
(kΩ)
0
10
PEAK CURRENT TRIP THRESHOLD (mA)
30
50
70
90
200 400 600 800 1000
3642 G07
1200
110
20
40
60
80
100
120
V
IN
= 10V
INPUT VOLTAGE (V)
5
10
12
14
SLEEP
45
3642 G08
8
6
15 25 35
4
2
0
V
IN
SUPPLY CURRENT (µA)
SHUTDOWN
TEMPERATURE (°C)
–40
10
12
14
SLEEP
110
3642 G09
8
6
–10 20 50 80
4
2
0
V
IN
SUPPLY CURRENT (µA)
SHUTDOWN
V
IN
= 10V
LOAD CURRENT (mA)
0.1
80
EFFICIENCY (%)
90
100
1 10 100
3642 G01
70
75
85
95
65
60
FIGURE 11 CIRCUIT
I
SET
OPEN
V
OUT
= 5V
V
IN
= 10V
V
IN
= 45V
V
IN
= 15V
V
IN
= 24V
V
IN
= 36V
TEMPERATURE (°C)
–40
0.798
FEEDBACK COMPARATOR TRIP VOLTAGE (V)
0.799
0.800
0.801
–10 20 50 80
3642 G04
110
V
IN
= 10V
T
A
= 25°C, unless otherwise noted.