Datasheet

TPS54311, TPS54312
TPS54313, TPS54314
TPS54315, TPS54316
SLVS416B − FEBRUARY 2002 − REVISED APRIL 2005
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11
PERFORMANCE GRAPHS
50
60
70
80
90
100
0123 45
Load Current − A
Efficiency − %
EFFICIENCY
vs
LOAD CURRENT
3.3 V
I
5 V
I
Efficiency at 700 kHz
Figure 13
Figure 14
1.7
1.75
1.8
1.85
1.9
012345
I
L
− Load Current − A
− Output Voltage − %
OUTPUT VOLTAGE
vs
LOAD CURRENT
V
O
3.3 V
I
5 V
I
−30
−15
0
30
45
60
100 1 k 10 k 100 k 1 M
−90
−45
0
45
90
180
f − Frequency − Hz
Gain − dB
LOOP RESPONSE
Phase − Degrees
Gain
Phase
15
135
Figure 15
V
O
(AC)
10 mV/div
V
I
= 5 V
I
O
= 3 A
400 ns/div
OUTPUT RIPPLE VOLTAGE
Time − 100 µs/div
Amplitude − 10 mV/div
Figure 16
Figure 17
Figure 18
V
O
50 mV/div
LOAD TRANSIENT RESPONSE
I
O
2 A/div
Load Transient Response − mV
Time − 10 µs/div
V
I
2 V/div
V
O
2 V/div
V
PWRGD
5 V/div
START-UP WAVEFORMS
Start Up Waveforms − V
Time − 2 ms/div
V
I
= 5 V
75
55
35
012
− Ambient Temperature −
85
95
AMBIENT TEMPERATURE
vs
LOAD CURRENT
125
34
115
45
25
65
105
C
°
T
A
I
L
− Load Current − A
Safe Operating Area
†
†
Safe operating area is applicable to the test
board conditions listed in the Dissipation Rating
Table section of this data sheet.
Figure 19