Datasheet

8
LT1764 Series
1764fb
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Ripple Rejection
Ripple Rejection LT1764 Minimum Input Voltage
FREQUENCY (Hz)
20
RIPPLE REJECTION (dB)
30
50
70
80
10 1k 10k 1M
1764 G31
10
100
100k
60
40
0
C
OUT
= 100µF
TANTALUM +
10 × 1µF
CERAMIC
C
OUT
= 10µF
TANTALUM
I
L
= 1.5A
V
IN
= V
OUT(NOM)
+ 1V
+ 50mV
RMS
RIPPLE
TEMPERATURE (°C)
50 –25
50
RIPPLE REJECTION (dB)
60
75
0
50
75
1764 G32
55
70
65
25
100
125
I
L
= 1.5A
V
IN
= V
OUT(NOM)
+ 1V
+ 0.5V
P-P
RIPPLE
AT f = 120Hz
TEMPERATURE (°C)
–50
MINIMUM INPUT VOLTAGE (V)
2.0
2.5
3.0
25 75
1764 G33
1.5
1.0
–25 0
50 100 125
0.5
0
I
L
= 3A
I
L
= 1.5A
I
L
= 100mA
I
L
= 500mA
Current Limit Reverse Output Current
Reverse Output Current
TEMPERATURE (°C)
–50
CURRENT LIMIT (A)
4
5
6
25 75
1764 G28
3
2
–25 0
50 100 125
1
0
V
IN
= 7V
V
OUT
= 0V
OUTPUT VOLTAGE (V)
0
REVERSE OUTPUT CURRENT (mA)
3.0
4.0
5.0
8
1764 G29
2.0
1.0
2.5
3.5
4.5
1.5
0.5
0
2
4
6
19
3
5
7
10
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)
LT1764
LT1764-1.8
LT1764-2.5
LT1764-3.3
TEMPERATURE (°C)
–50
0
REVERSE OUTPUT CURRENT (mA)
0.1
0.3
0.4
0.5
1.0
0.7
0
50
75
1764 G30
0.2
0.8
0.9
0.6
–25
25
100
125
V
IN
= 0V
V
OUT
= 1.21V (LT1764)
V
OUT
= 1.8V (LT1764-1.8)
V
OUT
= 2.5V (LT1764-2.5)
V
OUT
= 3.3V (LT1764-3.3)
LT1764-1.8/-2.5/-3.3
LT1764