Datasheet

0
5
10
15
20
25
30
0 10 20 30 40 50 60 70 80 90 100
Ambient Temperature (°C)
Output Current (A)
V
OUT
= 0.8 V
V
OUT
= 1.0 V
V
OUT
= 1.2 V
V
OUT
= 1.8 V
V
OUT
= 2.5 V
V
OUT
= 3.3 V
f
DW
= 500 kHz
V
VIN
= 12 V
G001
0
5
10
15
20
25
30
0 10 20 30 40 50 60 70 80 90 100
Ambient Temperature (°C)
Output Current (A)
V
OUT
= 0.8 V
V
OUT
= 1.0 V
V
OUT
= 1.2 V
V
OUT
= 1.8 V
V
OUT
= 2.5 V
V
OUT
= 3.3 V
f
SW
= 500 kHz
V
VIN
= 5 V
G001
50
55
60
65
70
75
80
85
90
95
100
0 5 10 15 20 25
Load Current (A)
Efficiency (%)
V
OUT
= 0.8 V
V
OUT
= 1.0 V
V
OUT
= 1.2 V
V
OUT
= 1.8 V
V
OUT
= 2.5 V
V
OUT
= 3.3 V
f
SW
= 500 kHz
V
VIN
= 12 V
T
A
= 25°C
G001
50
55
60
65
70
75
80
85
90
95
100
0 5 10 15 20 25
Load Current (A)
Efficiency (%)
V
OUT
= 0.8 V
V
OUT
= 1.0 V
V
OUT
= 1.2 V
V
OUT
= 1.8 V
V
OUT
= 2.5 V
V
OUT
= 3.3 V
f
SW
= 500 kHz
V
VIN
= 5 V
T
A
= 25°C
G001
40
42
44
46
48
50
52
54
−40 −25 −10 5 20 35 50 65 80 95 110 125
Junction Temperature (°C)
High−Side Overcurrent Threshold (A)
V
VDD
= 4.5 V
V
VDD
= 12 V
450
500
550
600
650
700
750
−40 −25 −10 5 20 35 50 65 80 95 110 125
Junction Temperature (°C)
Power−Good Threshold Voltage (mV)
V
OV
V
UV
TPS56221
www.ti.com SLUSAH5B –MARCH 2011–REVISED SEPTEMBER 2012
TYPICAL CHARACTERISTICS
Figure 13 to Figure 18 are measured on a 2.5" x 2.5", 0.062" thick FR4 board with 4 layers and 2 oz. copper, a 0.32-µH
output inductor and a DCR of 0.32 mΩ.
Figure 13. High-Side Overcurrent Threshold vs. Junction Figure 14. Power Good Threshold Voltage vs. Junction
Temperature Temperature
Figure 15. Efficiency vs. Load Current (V
VIN
= 12 V) Figure 16. Efficiency vs. Load Current (V
VIN
= 5 V)
Figure 17. Output Current vs. Ambient Temperature Figure 18. Output Current vs. Ambient Temperature
(V
VIN
= 12 V) (V
VIN
= 5 V)
Copyright © 2011–2012, Texas Instruments Incorporated 9
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