LT1764A View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT1764A Datasheet PDF : 20 Pages
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LT1764A Series
TYPICAL PERFOR A CE CHARACTERISTICS
Current Limit
6
5
TJ = –50°C
4
3
TJ = 125°C
TJ = 25°C
2
1
0
0 2 4 6 8 10 12 14 16 18 20
INPUT/OUTPUT DIFFERENTIAL (V)
1764 G27
Current Limit
6
5
VIN = 7V
VOUT = 0V
4
3
2
1
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1764 G28
Reverse Output Current
1.0
VOUT = 1.21V (LT1764A)
0.9 VOUT = 1.5V (LT1764A-1.5)
0.8
VOUT = 1.8V (LT1764A-1.8)
VOUT = 2.5V (LT1764A-2.5)
0.7 VOUT = 3.3V (LT1764A-3.3)
VIN = 0V
0.6
LT1764A-1.5/1.8/-2.5/-3.3
0.5
0.4
0.3
LT1764A
0.2
0.1
0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
1764 G30
Ripple Rejection
80
70
60
50
COUT = 100µF
TANTALUM +
40
10 × 1µF
CERAMIC
30
20
IL = 1.5A
COUT = 10µF
TANTALUM
10 VIN = VOUT(NOM) + 1V
+ 50mVRMS RIPPLE
0
10
100
1k
10k 100k 1M
FREQUENCY (Hz)
1764 G31
Reverse Output Current
5.0
LT1764A-1.5
4.5
LT1764A-1.8
4.0
LT1764A-2.5
3.5
LT1764A-3.3
3.0
LT1764A
2.5
2.0
TJ = 25°C
VIN = 0V
1.5
CURRENT FLOWS
INTO OUTPUT PIN
1.0
VOUT = VADJ (LT1764A)
0.5
VOUT = VFB
(LT1764A-1.5/1.8/-2.5/-3.3)
0
0 1 2 3 4 5 6 7 8 9 10
OUTPUT VOLTAGE (V)
1764 G29
Ripple Rejection
75
IL = 1.5A
VIN = VOUT(NOM) + 1V
70
+ 0.5VP-P RIPPLE
AT f = 120Hz
65
60
55
50
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1764 G32
LT1764A Minimum Input Voltage
3.0
2.5
IL = 3A
2.0
IL = 1.5A
1.5
IL = 500mA
IL = 100mA
1.0
0.5
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1764 G33
8
Load Regulation
10
5
LT1764A
0
–5
LT1764A-1.5
–10
LT1764A-1.8
LT1764A-2.5
–15
LT1764A-3.3
–20 ∆IL = 1mA TO 3A
VIN = 2.7V (LT1764A/LT1764A-1.5)
–25 VIN = VOUT(NOM) + 1V
(LT1764A-1.8/-2.5/-3.3)
–30
– 50 – 25 0 25 50 75 100 125
TEMPERATURE (°C)
1764 G34
Output Noise Spectral Density
1
COUT = 10µF
ILOAD = 3A
LT1764A-3.3
0.1
LT1764A-2.5
LT1764A
LT1764A-1.8
LT1764A-1.5
0.01
10
100
1k
10k
FREQUENCY (Hz)
100k
1764 G35
1764afb
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