LT1764EQ-1.8(RevA) View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT1764EQ-1.8 Datasheet PDF : 16 Pages
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LT1764 Series
TYPICAL PERFOR A CE CHARACTERISTICS
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
Load Regulation
10
5
LT1764
0
–5
LT1764-1.8
–10
LT1764-2.5
–15
LT1764-3.3
–20 ∆IL = 1mA TO 3A
VIN = 2.7V (LT1764)
–25 VIN = VOUT(NOM) + 1V
(LT1764-1.8/-2.5/-3.3)
–30
– 50 – 25 0 25 50 75 100 125
TEMPERATURE (°C)
1764 G34
LT1764-3.3 10Hz to 100kHz
Output Noise
VOUT
100µV/DIV
COUT = 10µF
IL = 3A
1ms/DIV
1764 G37
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
Output Noise Spectral Density
1
COUT = 10µF
ILOAD = 3A
LT1764-3.3
0.1
LT1764-2.5
LT1764
LT1764-1.8
0.01
10
100
1k
10k
FREQUENCY (Hz)
100k
1764 G35
LT1764-3.3 Transient Response
0.2
0.1
0
–0.1
VIN = 4.3V
–0.2
CIN = 3.3µF TANTALUM
COUT = 10µF TANTALUM
1.00
0.75
0.50
0.25
0
0 2 4 6 8 10 12 14 16 18 20
TIME (µs)
1764 G38
LT1764 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
RMS Output Noise vs Load Current
(10Hz to 100kHz)
40
COUT = 10µF
35
LT1764-3.3
30
LT1764-2.5
25
LT1764-1.8
20
LT1764
15
10
5
0
0.0001 0.001 0.01 0.1
1
10
LOAD CURRENT (A)
1764 G36
LT1764-3.3 Transient Response
0.2
0.1
0
–0.1
VIN = 4.3V
–0.2
CIN = 33µF
COUT = 100µF TANTALUM
+ 10 × 1µF CERAMIC
3
2
1
0
0 2 4 6 8 10 12 14 16 18 20
TIME (µs)
1764 G39
1764fa
8
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