LT1764 Series
TYPICAL PERFOR A CE CHARACTERISTICS
Current Limit
6
5
CURRENT LIMIT (A)
4
3
2
1
0
–50 –25
V
IN
= 7V
V
OUT
= 0V
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
T
J
= 25°C
V
IN
= 0V
CURRENT FLOWS
INTO OUTPUT PIN
V
OUT
= V
ADJ
(LT1764)
V
OUT
= V
FB
(LT1764-1.8/-2.5/-3.3)
0
1
2
3 4 5 6 7 8
OUTPUT VOLTAGE (V)
9
10
REVERSE OUTPUT CURRENT (mA)
50
25
75
0
TEMPERATURE (°C)
Reverse Output Current
1.0
REVERSE OUTPUT CURRENT (mA)
RIPPLE REJECTION (dB)
V
IN
= 0V
0.9 V
OUT
= 1.21V (LT1764)
= 1.8V (LT1764-1.8)
V
0.8
OUT
V
OUT
= 2.5V (LT1764-2.5)
0.7 V
OUT
= 3.3V (LT1764-3.3)
0.6
0.5
0.4
0.3
0.2
0.1
0
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
LT1764
LT1764-1.8/-2.5/-3.3
Ripple Rejection
75
I
L
= 1.5A
V
IN
= V
OUT(NOM)
+ 1V
+ 0.5V
P-P
RIPPLE
AT f = 120Hz
70
MINIMUM INPUT VOLTAGE (V)
RIPPLE REJECTION (dB)
65
60
55
50
–50
–25
50
25
0
75
TEMPERATURE (°C)
8
U W
Reverse Output Current
LT1764
LT1764-1.8
LT1764-2.5
LT1764-3.3
100
125
0
1764 G28
1764 G29
Ripple Rejection
80
70
60
50
40
30
C
OUT
= 10µF
I
L
= 1.5A
TANTALUM
10 V
IN
= V
OUT(NOM)
+ 1V
+ 50mV
RMS
RIPPLE
0
100
100k
10
1k
10k
FREQUENCY (Hz)
20
C
OUT
= 100µF
TANTALUM +
10
×
1µF
CERAMIC
1M
1764 G30
1764 G31
LT1764 Minimum Input Voltage
3.0
2.5
2.0
I
L
= 1.5A
1.5
I
L
= 500mA
1.0
0.5
0
–50 –25
I
L
= 100mA
I
L
= 3A
100
125
50
25
75
0
TEMPERATURE (°C)
100
125
1764 G32
1764 G33
1764fb
LINER [ LINEAR TECHNOLOGY ]
