Datasheet

Vin = 3.3 V
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
Output Voltage Deviation - %
0
1
4 5
6
Output Current - A
2
3
Vin = 5 V
3 3.5 5 6
Input Voltage-V
Iout = 3 A
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
Output Voltage Deviation - %
4 . 5 5.54
100 1000 10k 100k 1M
Frequency - Hz
–60
Gain - dB
50
40
30
20
10
0
–10
–20
–30
–40
–50
60
Phase - Degrees
150
120
90
60
30
0
–30
–60
–90
–120
–150
–180
180
Phase
Gain
Vin = 100 mV / div (ac coupled)
PH = 2 V / div
Time = 500 nsec / div
TPS54618
www.ti.com SLVSAE9D –NOVEMBER 2010–REVISED DECEMBER 2013
INPUT RIPPLE, 3 A CLOSED LOOP RESPONSE, VIN (5 V), 3 A
Figure 45. Figure 46.
LOAD REGULATION REGULATION
vs vs
LOAD CURRENT INPUT VOLTAGE
Figure 47. Figure 48.
POWER DISSIPATION ESTIMATE
The following formulas show how to estimate the IC power dissipation under continuous conduction mode (CCM)
operation. The power dissipation of the IC (Ptot) includes conduction loss (Pcon), dead time loss (Pd), switching
loss (Psw), gate drive loss (Pgd) and supply current loss (Pq).
Pcon = Io
2
× R
DS_on_Temp
Pd = ƒ
sw
× Io × 0.7 × 40 × 10
–9
Psw = 1/2 × V
in
× Io × ƒ
sw
× 13 × 10
–9
Pgd = 2 × V
in
× ƒ
sw
× 10 × 10
–9
Pq = V
in
× 515 × 10
–6
Where:
I
O
is the output current (A).
R
DS_on_Temp
is the on-resistance of the high-side MOSFET with given temperature (Ω).
V
in
is the input voltage (V).
ƒ
sw
is the switching frequency (Hz).
Copyright © 2010–2013, Texas Instruments Incorporated Submit Documentation Feedback 27
Product Folder Links: TPS54618