Datasheet

88
90
92
94
96
98
100
102
104
106
108
110
112
Vsense (Good) Falling
Vsense (Fault) Rising
Vsense (Fault) Rising
Vsense (Good) Falling
-40 -10 20 50 80 110 140
T - Junction Temperature - °C
J
PWRGD Threshold - % Vref
6
6.5
7
7.5
8
-40 -10 20 50 80 110 140
T - Junction Temperature - °C
J
V = 3.3 V
I
V = 5 V
I
HSFET lim - High Side Fet Current Limit Current - A
20
30
40
50
60
70
80
90
100
110
120
130
V = 5 V
I
-40 -10 20 50 80 110 140
T - Junction Temperature - °C
J
R - Power Good -
dson
W
TPS54519
www.ti.com SLVSAT3A –SEPTEMBER 2011–REVISED DECEMBER 2013
TYPICAL CHARACTERISTICS CURVES (continued)
HIGH-SIDE FET CURRENT LIMIT vs
TEMPERATURE PWRGD Rdson vs TEMPERATURE
Figure 13. Figure 14.
PWRGD THRESHOLD vs TEMPERATURE
Figure 15.
OVERVIEW
The TPS54519 is a 6-V, 5-A, synchronous step-down (buck) converter with two integrated n-channel MOSFETs.
To improve performance during line and load transients the device implements a constant frequency, peak
current mode control which reduces output capacitance and simplifies external frequency compensation design.
The wide switching frequency of 200 kHz to 2000 kHz allows for efficiency and size optimization when selecting
the output filter components. The switching frequency is adjusted using a resistor to ground on the RT pin.
The TPS54519 has a typical default start up voltage of 2.6 V. The EN pin has an internal pull-up current source
that can be used to adjust the input voltage under voltage lockout (UVLO) with two external resistors. In addition,
the pull up current provides a default condition when the EN pin is floating for the device to operate. The total
operating current for the TPS54519 is 455 μA when not switching and under no load. When the device is
disabled, the supply current is less than 5 μA.
The integrated 30 mΩ MOSFETs allow for high efficiency power supply designs with continuous output currents
up to 5 amperes.
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