ISL78302A_14 Datasheet, PDF (8/11 Pages) Intersil Corporation – Dual LDO with Low Noise, Very High PSRR and Low IQ

ISL78302A
Typical Performance Curves (Continued)
V_O2 (10mV/DIV)
3
2
1
0
5
0
V_IN = 5.0V
V_O1 = 3.3V
V_O2 = 2.8V
I_L1 = 300mA
I_L2 = 300mA
C_L1, C_L2 = 1µF
C_BYP = 0.01µF
0 100 200 300 400 500 600 700 800 900 1000
TIME (µs)
FIGURE 15. TURN-ON/TURN-OFF RESPONSE
4.2V
3.5V
V_O = 2.8V
I_LOAD = 300mA
C_LOAD = 1µF
C_BYP = 0.01µF
10mV/DIV
400µs/DIV
FIGURE 17. LINE TRANSIENT RESPONSE (2.8V OUTPUT)
100
90
80
70
60
50
40
30
20
10
0
0.1
V_IN = 3.6V
V_O = 1.8V
I_O = 10mA
C_BYP = 0.1µF
C_LOAD = 1µF
1k
10k
100k
1M
FREQUENCY (Hz)
FIGURE 19. PSRR vs FREQUENCY
4.3V
3.6V
V_O = 3.3V
I_LOAD = 300mA
C_LOAD = 1µF
C_BYP = 0.01µF
10mV/DIV
400µs/DIV
FIGURE 16. LINE TRANSIENT RESPONSE (3.3V OUTPUT)
V_O (25mV/DIV)
V_O = 1.8V
V_IN = 2.8V
300mA
100µA
I_LOAD
100µs/DIV
FIGURE 18. LOAD TRANSIENT RESPONSE
1000
100
10
V_IN = 3.6V
V_O = 1.8V
I_LOAD = 10mA
1 ^{CBYP = 0.1µF}
C_IN = 1µF
C_LOAD = 1µF
0.1
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
FIGURE 20. SPECTRAL NOISE DENSITY vs FREQUENCY
8
FN7932.1
December 23, 2013