Datasheet

7
LT1764 Series
1764fb
TYPICAL PERFOR A CE CHARACTERISTICS
UW
SHDN Pin Input Current ADJ Pin Bias Current Current Limit
TEMPERATURE (°C)
–50
0
SHDN PIN THRESHOLD (V)
0.1
0.3
0.4
0.5
1.0
0.7
0
50
75
1764 G22
0.2
0.8
0.9
0.6
–25
25
100
125
I
L
= 1mA
TEMPERATURE (°C)
–50
0
SHDN PIN THRESHOLD (V)
0.1
0.3
0.4
0.5
1.0
0.7
0
50
75
1764 G23
0.2
0.8
0.9
0.6
–25
25
100
125
I
L
= 3A
I
L
= 1mA
SHDN PIN VOLTAGE (V)
0
SHDN PIN INPUT CURRENT (µA)
6
8
10
16
1764 G24
4
2
5
7
9
3
1
0
4
8
12
218
6
10
14
20
TEMPERATURE (°C)
–50
0
SHDN PIN INPUT CURRENT (µA)
1
3
4
5
10
7
0
50
75
1764 G25
2
8
9
6
–25
25
100
125
V
SHDN
= 20V
TEMPERATURE (°C)
–50
ADJ PIN BIAS CURRENT (µA)
25
1756 G26
–25 0 50
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
75 100 125
INPUT/OUTPUT DIFFERENTIAL (V)
0
CURRENT LIMIT (A)
2
4
6
1
3
5
4 8 12 16
1764 G27
2020 6 10 14 18
T
J
= –50°C
T
J
= 125°C
T
J
= 25°C
LT1764-3.3 GND Pin Current LT1764 GND Pin Current GND Pin Current vs I
LOAD
INPUT VOLTAGE (V)
0
GND PIN CURRENT (mA)
120
160
200
8
1764 G19
80
40
0
2
4
6
19
3
5
7
10
R
L
= 1.1Ω
I
L
= 3A*
R
L
= 2.2Ω
I
L
= 1.5A*
T
J
= 25°C
V
SHDN
= V
IN
*FOR V
OUT
= 3.3V
R
L
= 4.71Ω
I
L
= 0.7A*
INPUT VOLTAGE (V)
0
GND PIN CURRENT (mA)
90
120
150
8
1764 G20
60
30
0
2
4
6
19
3
5
7
10
R
L
= 0.4Ω
I
L
= 3A*
R
L
= 0.81Ω
I
L
= 1.5A*
T
J
= 25°C
V
SHDN
= V
IN
*FOR V
OUT
= 1.21V
R
L
= 1.73Ω
I
L
= 0.7A*
OUTPUT CURRENT (A)
0
GND PIN CURRENT (mA)
60
80
100
1.5
2.5
1764 G21
40
20
0
0.5 1.0 2.0
120
140
160
3.0
V
IN
= V
OUT(NOM)
+ 1V
SHDN Pin Threshold
(Off-to-On)
SHDN Pin Input Current
SHDN Pin Threshold
(On-to-Off)