Datasheet

4
LT1767/LT1767-1.8/
LT1767-2.5/LT1767-3.3/LT1767-5
sn1767 1767fas
TEMPERATURE (°C)
–50
–25 0 25 50 75 100 125
SHDN THRESHOLD (V)
1767 G04
1.40
1.38
1.36
1.34
1.32
1.30
V
IN
(V)
0 5 10 15 20 25 30
V
IN
CURRENT (µA)
1767 G05
7
6
5
4
3
2
1
0
SHDN = 0V
LOAD CURRENT (A)
0.001 0.01
0.1 1
INPUT VOLTAGE (V)
1767 G07
3.5
3.3
3.1
2.9
2.7
2.5
SHUTDOWN VOLTAGE (V)
0
0.2 0.4 0.6 0.8 1 1.2 1.4
V
IN
CURRENT (µA)
1767 G08
300
250
200
150
100
50
0
V
IN
= 15V
INPUT VOLTAGE (V)
0 5 10 15 20 25 30
V
IN
CURRENT (µA)
1767 G09
1200
1000
800
600
400
200
0
MINIMUM
INPUT
VOLTAGE
SHDN I
P
Current vs Temperature
SHDN Threshold vs Temperature SHDN Supply Current vs V
IN
Minimum Input Voltage for 2.5V Out SHDN Supply Current Input Supply Current
FEEDBACK VOLTAGE (V)
0 0.2
0.4 0.6 0.8 1 1.2
SWITCH PEAK CURRENT (A)
1767 G10
2.0
1.5
1.0
0.5
0
FB INPUT CURRENT (µA)
40
30
20
10
0
FB CURRENT
SWITCH CURRENT
1767 G11
INPUT VOLTAGE (V)
0 5 10 15 20 25
OUTPUT CURRENT (A)
1.5
1.3
1.1
0.9
0.7
0.5
L = 4.7µH
L = 2.2µH
L = 1.5µH
INPUT VOLTAGE (V)
05
10 15 20 25
OUTPUT CURRENT (A)
1767 G12
1.5
1.3
1.1
0.9
0.7
L = 4.7µH
L = 2.2µH
L = 1.5µH
Current Limit Foldback
Maximum Load Current,
V
OUT
= 5V
Maximum Load Current,
V
OUT
= 2.5V
TYPICAL PERFOR A CE CHARACTERISTICS
UW
TEMPERATURE (°C)
–50
–25 0 25 50 75 100 125
SHDN INPUT (µA)
1767 G06
–12
–10
–8
–6
–4
–2
0
STARTING UP
SHUTTING DOWN