TPS54319_1 Datasheet, PDF (26/35 Pages) Texas Instruments – 2.95-V to 6-V Input, 3-A Output, 2-MHz, Synchronous Step-Down Switcher With Integrated FETs ( SWIFT™)

TPS54319
SLVSA83 – JUNE 2010
Vin = 5 V / div
POWER UP VOUT, EN
OUTPUT RIPPLE, 3 A
Vout = 20 mV / div (ac coupled)
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Vout = 2 V / div
EN = 2 V / div
PWRGD = 5 V / div
Time = 5 msec / div
Figure 42.
INPUT RIPPLE, 3 A
Vin = 100 mV / div (ac coupled)
PH = 2 V / div
Time = 500 nsec / div
Figure 44.
LOAD REGULATION
vs
LOAD CURRENT
0.4
0.3
0.2
0.1
Vin = 5 V
0
Vin = 3.3 V
-0.1
-0.2
-0.3
-0.4
0
0.5
1
1.5
2
Output Current - A
Figure 46.
2.5
3
PH = 2 V / div
Time = 500 nsec / div
60
50
40
30
20
10
0
–10
–20
–30
–40
–50
–60
10
0.4
0.3
0.2
Figure 43.
CLOSED LOOP RESPONSE, VIN (5 V), 3 A
180
150
120
90
60
30
0
–30
–60
–90
Gain
Phase
100
1000
10k
Frequency - Hz
100k
–120
–150
–180
1M
Figure 45.
REGULATION
vs
INPUT VOLTAGE
Iout = 2 A
0.1
0
-0.1
-0.2
-0.3
-0.4
3
3.5
4
4.5
5
5.5
6
Input Voltage-V
Figure 47.
26
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