TPS54550 Datasheet, PDF (13/27 Pages) Texas Instruments – 4.5-V TO 20-V INPUT, 6-A OUTPUT SYNCHRONOUS PWM SWITCHER WITH INTEGRATED FET (SWIFT)

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TYPICAL CHARACTERISTICS
TPS54550
SLVS623A – MARCH 2006 – REVISED APRIL 2006
ON RESISTANCE
vs
JUNCTION TEMPERATURE
90
80
70
V_IN = 4.5 V
60
50
40
30
V_IN = 12 V
20
10
0
-50 -25 0 25 50 75 100 125 150
T_J - Junction Temperature - °C
Figure 5.
MINIMUM OUTPUT VOLTAGE
vs
INPUT VOLTAGE
5.5
5 ^{IO > 0.5 A}
4.5
4
700 kHz
3.5
600 kHz
3
500 kHz
2.5
400 kHz
2
1.5
1
0.5
300 kHz
200 kHz
0
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
V_I − Input Voltage − V
Figure 8.
MAXIMUM SWITCHING FREQUENCY
vs
INPUT VOLTAGE
800
V_O = 1.8 V
V_O = 2.5 V
700
V_O = 3.3 V
600
500
400
300
200
100
0
5
V_O = 0.9 V
I_O < 0.1 A
V_O = 1.2 V
V_O = 1.5 V
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
V_I − Input Voltage − V
Figure 11.
CURRENT LIMIT
vs
INPUT VOLTAGE
8.50
T_J = 25°C
8.25
8
7.75
7.50
0
5
10
15
20
25
V_I - Input Voltage - V
Figure 6.
MINIMUM OUTPUT VOLTAGE
vs
INPUT VOLTAGE
5.5
5 ^{IO = 0 A}
4.5
700 kHz
600 kHz
4
500 kHz
3.5
400 kHz
3 _{300 kHz}
2.5
2
1.5
1
0.5
200 kHz
0
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
V_I − Input Voltage − V
Figure 9.
MAXIMUM OUTPUT VOLTAGE
vs
INPUT VOLTAGE
14
12
10
8
6
4
2
0
0
5
10
15
20
25
V _I − Input Voltage − V
Figure 12.
INTERNAL VOLTAGE REFERENCE
vs
JUNCTION TEMPERATURE
0.8912
0.8910
VIN = 12 V
0.8908
0.8906
0.8904
0.8902
0.8900
0.8898
−50 −25 0 25 50 75 100 125 150
T_J − Junction Temperature − 5C
Figure 7.
MAXIMUM SWITCHING FREQUENCY
vs
INPUT VOLTAGE
800
V_O = 2.5 V ^{VO = 3.3 V}
700
600
500
400
300 ^VO ^{= 1.8 V}
V_O = 1.5 V
200
V_O = 0.9 V
V_O = 1.2 V
100
I_O > 0.5 A
0
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
V_I − Input Voltage − V
Figure 10.
RT RESISTANCE
vs
SWITCHING FREQUENCY
225
200
175
150
125
100
75
50
200 300 400 500 600 700
Switching Frequency − kHz
Figure 13.
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