TPS54418_17 Datasheet, PDF (7/42 Pages) Texas Instruments – 2.95-V to 6-V Input, 4-A Output, 2-MHz , Synchronous Step-Down Switcher With Integrated FETs (SWIFT)

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7.6 Typical Characteristics
0.055
0.05
0.045
0.04
High Side Rdson
V_I = 3.3 V
Low Side Rdson
V_I = 3.3 V
High Side Rdson
V_I = 5 V
0.035
0.03
Low Side Rdson
V_I = 5 V
0.025
0.02
-50
-25
0
25
50
75
100 125 150
T_J - Junction Temperature - °C
Figure 1. High-Side and Low-Side On-Resistance vs
Junction Temperature
7
6.9 ^VIN ^{= 3 V}
6.8
6.7
6.6
6.5
6.4
6.3
6.2
6.1
6
-50 -25
0
25
50
75 100 125 150
T_J - Junction Temperature - °C
Figure 3. High-Side Current Limit vs Junction Temperature
1000
900
800
700
600
500
400
300
200
100 200 300 400 500 600 700 800 900 1000
RT - Resistance - kW
Figure 5. Switching Frequency vs RT Resistance Low
Frequency Range
TPS54418
SLVS946D – SEPTEMBER 2009 – REVISED DECEMBER 2014
550
540
RT = 400 kW,
V_I = 3.3 V
530
520
510
500
490
480
470
460
450
-50
-25
0
25
50
75
100 125 150
T_J - Junction Temperature - °C
Figure 2. Frequency vs Junction Temperature
0.808
0.806
V_IN = 3 .3 V
0.804
0.802
0.8
0.798
0.796
0.794
0.792
-50 -25
0
25
50
75 100 125 150
T_J - Junction Temperature - °C
Figure 4. Voltage Reference vs Junction Temperature
2000
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
80
100
120
140
160
180
200
RT - Resistance kW
Figure 6. Switching Frequency vs RT Resistance High
Frequency Range
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