LT1963_15 Datasheet, PDF (9/20 Pages) Linear Technology – 1.5A, Low Noise, Fast Transient Response LDO Regulators

TYPICAL PERFOR A CE CHARACTERISTICS
LT1963 Series
LT1963 Minimum Input Voltage
3.0
2.5
I_L = 1.5A
2.0
I_L = 500mA
1.5
I_L = 100mA
1.0
0.5
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1963 G33
Load Regulation
10
5
LT1963-1.5
LT1963-1.8
0
LT1963
–5
LT1963-2.5
LT1963-3.3
–10
V_IN = V_OUT(NOMINAL) +1V
–15 ^{(LT1963-1.5/-1.8/-2.5/-3.3)}
V_IN = 2.7V (LT1963)
∆I_L = 1mA TO 1.5A
– 20
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
1963 G34
Output Noise Spectral Density
1.0
C_OUT = 10µF
I_L =1.5A
LT1963-3.3
0.1
LT1963-2.5
LT1963
LT1963-1.8 _LT1963-1.5
0.01
10
100
1k
10k
FREQUENCY (Hz)
100k
1963 G35
RMS Output Noise vs Load
Current (10Hz to 100kHz)
50
C_OUT = 10µF
45
40
LT1963-3.3
35
LT1963-2.5
30
25
LT1963-1.8
20
LT1963-1.5
15
LT1963
10
5
0
0.0001 0.001 0.01 0.1
LOAD CURRENT (A)
1
10
1063 G36
LT1963-3.3 10Hz to 100kHz Output Noise
V_OUT
100µV/DIV
C_OUT = 10µF
I_LOAD = 1.5A
1ms/DIV
1963 G37
LT1963-3.3 Transient Response
200 _{VIN = 4.3V}
150 CIN = 3.3µF TANTALUM
100 ^{COUT = 10µF TANTALUM}
50
0
–50
–100
0.6
0.4
0.2
0
0 2 4 6 8 10 12 14 16 18 20
TIME (µs)
1963 G38
LT1963-3.3 Transient Response
150
100
50
0
–50
–100
–150
1.5
1.0
V_IN = 4.3V
C_IN = 33µF TANTALUM
0.5
C_OUT = 100µF TANTALUM
+10 × 1µF CERAMIC
0
0 50 100 150 200 250 300 350 400 450 500
TIME (µs)
1963 G39
1963fc
9