Datasheet
-3
-2.9
-2.8
-2.7
-2.6
-2.5
-2.4
-2.3
-2.2
-2.1
-2
Vin = 3.3 V; Vss = 0.4 V
Vin = 5 V; Vss = 0.4 V
-50 -25 0 25 50 75 100 125 150
T - Junction Temperature - °C
J
I 2 - SS Charge Current - A
SS
m
RDSON - Power Good - W
40
50
60
70
80
90
100
V = 5 V
IN
-50 -25 0 25 50 75 100 125 150
T - Junction Temperature - °C
J
PWRGD Threshold - % Vref
88
90
92
94
96
98
100
102
104
106
108
110
Vsense (Good) Falling
Vsense (Fault) Rising
Vsense (Fault) Falling
Vsense (Good) Falling
-50 -25 0 25 50 75 100 125 150
T - Junction Temperature - °C
J
0
2
4
6
8
10
12
14
16
18
20
V = 5.5 V
IN
-50 -25 0 25 50 75 100 125 150
T - Junction Temperature - °C
J
PWRGD - Leakage Current - nA
0 0.5 1 1.5 2 2.5 3 3.5 4
I - Output Current - A
O
50
55
60
65
70
75
80
85
90
95
100
Efficiency - %
Vin = 5 V,
DCR = 6.8 m ,
Fs = 1 MHz,
Tj = 25°C
W
V = 3.3 V
O
V = 2.5 V
O
V = 1.8 V
O
V = 1.2 V
O
V = 1 V
O
50
55
60
65
70
75
80
85
90
95
100
V = 2.5 V
O
Vin = 3.3 V,
DCR = 6.8 m ,
Fs = 1 MHz,
Tj = 25°C
W
0 0.5 1 1.5 2 2.5 3 3.5 4
I - Output Current - A
O
Efficiency - %
V = 1.8 V
O
V = 1.2 V
O
V = 1 V
O
TPS54478
www.ti.com
SLVSAS2 –JUNE 2011
TYPICAL CHARACTERISTICS CURVES (continued)
SS CHARGE CURRENT vs TEMPERATURE PWRGD Rdson vs TEMPERATURE
Figure 13. Figure 14.
PWRGD THRESHOLD vs TEMPERATURE PWRGD LEAKAGE CURRENT vs TEMPERATURE
Figure 15. Figure 16.
EFFICIENCY vs LOAD CURRENT EFFICIENCY vs LOAD CURRENT
Figure 17. Figure 18.
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