Datasheet

8
LT1764A Series
1764afb
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Ripple Rejection
Ripple Rejection
LT1764A Minimum Input Voltage
Load Regulation Output Noise Spectral Density
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
TEMPERATURE (°C)
–50
LOAD REGULATION (mV)
25
1764 G34
–25 0 50
10
5
0
–5
–10
–15
–20
–25
–30
75 100 125
LT1764A
LT1764A-3.3
LT1764A-2.5
LT1764A-1.8
∆I
L
= 1mA TO 3A
V
IN
= 2.7V (LT1764A/LT1764A-1.5)
V
IN
= V
OUT(NOM)
+ 1V
(LT1764A-1.8/-2.5/-3.3)
LT1764A-1.5
FREQUENCY (Hz)
10
0.01
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
0.1
1
100 1k 10k 100k
1764 G35
LT1764A-3.3 LT1764A-2.5
LT1764A-1.8
LT1764A-1.5
LT1764A
C
OUT
= 10µF
I
LOAD
= 3A
Current Limit Current Limit Reverse Output Current
Reverse Output Current
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
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
(LT1764A)
V
OUT
= V
FB
(LT1764A-1.5/1.8/-2.5/-3.3)
LT1764A
LT1764A-1.8
LT1764A-2.5
LT1764A-3.3
LT1764A-1.5
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
OUT
= 1.21V (LT1764A)
V
OUT
= 1.5V (LT1764A-1.5)
V
OUT
= 1.8V (LT1764A-1.8)
V
OUT
= 2.5V (LT1764A-2.5)
V
OUT
= 3.3V (LT1764A-3.3)
V
IN
= 0V
LT1764A-1.5/1.8/-2.5/-3.3
LT1764A
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