TPS54229E_15 Datasheet, PDF (10/25 Pages) Texas Instruments – 4.5V to 18V Input, 2-A Synchronous Step-Down Converter with Eco-Mode™

TPS54229E
SLVSAZ7A – SEPTEMBER 2011 – REVISED MARCH 2012
TYPICAL CHARACTERISTICS
VIN = 12 V, T_A = 25°C (unless otherwise noted).
100
EN = 10 V/div
90
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V_O = 3.3 V
VREG5 = 5 V/div
80
V_O = 1.8 V
V_O = 2.5 V
70
V_O = 0.5 V/div
60
50
t - Time - 1 ms
Figure 7. START-UP WAVE FORM
40
0
0.5
1
1.5
2
I_O - Output Current - A
Figure 8. EFFICIENCY vs OUTPUT CURRENT
100
90 V_O = 2.5 V
80
V_O = 3.3 V
70
60
V_O = 1.8 V
50
40
30
20
10
0
0.01
10
I_O - Output Current - A
Figure 9. LIGHT LOAD EFFICIENCY vs OUTPUT CURRENT
800
V_I = 12 V
700
V_O = 1.8 V
600
V_O = 1.05 V
500
400
V_O = 3.3 V
300
200
100
0
0.01
0.1
1
10
I_O - Output Current - A
Figure 11. SWITCHING FREQUENCY vs OUTPUT
CURRENT
900
850
800
750
V_O = 3.3 V
700
V_O = 5 V
650
600 ^{VO = 2.5 V}
550
500
V_O = 1.8 V
V_O = 1.2 V
V_O = 1.05 V
V_O = 1.5 V
450
400
0
5
10
15
20
V_I - Input Voltage - V
Figure 10. SWITCHING FREQUENCY vs INPUT VOLTAGE
V_O = 1.05 V
V_O = 10 mV/div
SW = 5 V/div
t - Time - 400 ns
Figure 12. VOLTAGE RIPPLE AT OUTPUT (I_O = 2 A)
10
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