TPS54239 Datasheet, PDF (9/21 Pages) Texas Instruments – 4.5V to 23V Input, 2-A Synchronous Step-Down SWIFT Converter

TPS54239
www.ti.com
TYPICAL CHARACTERISTICS
VIN = 12 V, T_A = 25°C (unless otherwise noted).
100
SLVSBT0 – JANUARY 2013
EN (10 V/div)
VREG5 (5 V/div)
Vout (0.5 V/div)
400 us/div
Figure 7. START-UP WAVE FORM
90
80
V_O = 3.3 V
V_O = 5 V
70
V_O = 1.8 V
60
50
40
0.0
0.5
1.0
1.5
2.0
I_OUT ± Output Current (A)
C006
Figure 8. EFFICIENCY vs OUTPUT CURRENT
900
850
800
750
700
V_O = 5 V
V_O = 3.3 V _{VO = 1.8 V}
650
600
550
500
V_O = 1.2 V
450
400
0
V_O = 1.05 V
5
10
15
20
25
V_IN ± Input Voltage (V)
C007
Figure 9. SWITCHING FREQUENCY vs
INPUT VOLTAGE (I_O = 1 A)
0.780
0.775
I_OUT = 1 A
0.770
800
700
V_O = 3.3 V
600
500
400
V_O = 1.05 V
V_O = 1.8 V
300
200
100
0
0.0
0.5
1.0
1.5
2.0
I_OUT ± Output Current (A)
C008
Figure 10. SWITCHING FREQUENCY vs OUTPUT CURRENT
Vo = 1.05 V
Vo (10 mV/div)
0.765
0.760
SW (5 V/div)
0.755
0.750
±50
0
50
100
150
T_J ± Junction Temperature (ƒC)
C009
Figure 11. VFB VOLTAGE vs JUNCTION
TEMPERATURE (I_O = 1 A)
400 ns/div
Figure 12. VOLTAGE RIPPLE AT OUTPUT (I_O = 2 A)
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