TPS74801-Q1
SLVSAI4A –OCTOBER 2010–REVISED FEBRUARY 2011
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TYPICAL CHARACTERISTICS
At TJ = +25°C, VIN = VOUT(TYP) + 0.3V, VBIAS = 5V, IOUT = 1A, VEN = VIN = 1.8V, VOUT = 1.5V, CIN = 1μF, CBIAS = 4.7μF, and
COUT = 10μF, unless otherwise noted.
VBIAS LINE TRANSIENT
VIN LINE TRANSIENT
CSS = 1nF
COUT = 10mF (Ceramic)
COUT = 10mF (Ceramic)
100mV/div
100mV/div
100mV/div
COUT = 2.2mF (Ceramic)
CSS = 1nF
3.8V
5.0V
1V/div
1V/div
1V/ms
1V/ms
3.3V
1.8V
Time (50ms/div)
Time (50ms/div)
Figure 20.
Figure 21.
OUTPUT LOAD TRANSIENT RESPONSE
TURN-ON RESPONSE
COUT = 470mF (OSCON)
CSS = 0nF
100mV/div
100mV/div
COUT = 10mF (Ceramic)
COUT = 2.2mF (Ceramic)
CSS = 1nF
CSS = 2.2nF
0.5V/div
VOUT
100mV/div
1A/div
1.2V
VEN
1.5A
CSS = 1nF
0V
1V/div
1A/ms
50mA
Time (50ms/div)
Time (1ms/div)
Figure 22.
Figure 23.
POWER-UP/POWER-DOWN
VIN = VBIAS = VEN
VPG (500mV/div)
VOUT
Time (20ms/div)
Figure 24.
10
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