TPS51317_15 Datasheet, PDF (18/28 Pages) Texas Instruments – 3.3-V/5-V Input, 6-A, D-CAP+™ Mode Synchronous Step-Down Integrated FETs Converter

TPS51317
SLUSAH9 – MARCH 2011
www.ti.com
TYPICAL CHARACTERISTICS
95
90
T_A = 25°C
V_IN = 3.3 V
85
80
75
70
65
60
55
50
45
40
0.01
0.1
1
Output Current (A)
Mode 1
Mode 3
Mode 4
Mode 7
Mode 8
10
Figure 13. Efficiency vs Output Current
95
90
T_A = 25°C
V_IN = 5 V
85
80
75
70
65
60
55
50
45
40
0.01
0.1
1
Output Current (A)
Mode 1
Mode 3
Mode 4
Mode 7
Mode 8
10
Figure 14. Efficiency vs Output Current
1.50
Mode 1
Mode 3
1.25
Mode 4
Mode 7
1.00
Mode 8
1.50
Mode 1
Mode 3
1.25
Mode 4
Mode 7
1.00
Mode 8
0.75
0.75
0.50
0.50
0.25
0.00
0.1
1
Output Current (A)
Figure 15. Power Loss
T_A = 25°C
V_IN = 3.3 V
10
0.25
0.00
0.1
1
Output Current (A)
Figure 16. Power Loss
T_A = 25°C
V_IN = 5 V
10
50
400
40
350
30
Gain
300
20
10
250
0 _Phase
200
-10
150
-20
100
-30
25°C
-40
-10°C
50
85°C
-50
0
1000
10 k
100 k
1M
10 M
Frequency (Hz)
Figure 17. Bode Plot (Non-Droop Mode) V_IN = 5 V,
V_OUT = 0.8 V, I_LOAD = 5 A
60
360
50
310
40
Gain
30
260
20
210
10
160
0 _Phase
-10
110
-20
60
-30
25°C
-40
-10°C
10
85°C
-50
-40
1000
10 k
100 k
1M
10 M
Frequency (Hz)
Figure 18. Bode Plot (Droop Mode), V_IN = 5 V,
V_OUT = 0.8 V, I_LOAD = 5 A
18
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