Datasheet

-0.1
-0.08
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
0.1
3 4 5 6
InputVoltage-V
Iout=2 A
PercentDeviation-%
-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2
0 1 2 3 4
OutputCurrent- A
PercentDeviation-%
Vin=5.0V
Gain
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
Frequency-Hz
-180
-150
-120
-90
-60
-30
0
30
60
90
120
150
180
Phase-Deg
100 1000
10000
100000
1000000
Phase
Gain
-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2
0 1 2 3 4
OutputCurrent- A
PercentDeviation-%
Vin=3.3
TPS54418
www.ti.com SLVS946C –MAY 2009–REVISED JULY 2013
LOAD REGULATION
vs
CLOSED LOOP RESPONSE, VIN (3.3 V), 4 A LOAD CURRENT
Figure 47. Figure 48.
LOAD REGULATION REGULATION
vs vs
LOAD CURRENT INPUT VOLTAGE
Figure 49. Figure 50.
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
× Rdson
Pd = ƒsw × Iout × 0.7 × 60 × 10
-9
Psw = 2 × Vin
2
× ƒsw × Io × 0.25 × 10
-9
Pgd = 2 × Vin × 3 × 10
-9
× ƒsw
Pq = 350 × 10
-6
× Vin
Where:
IOUT is the output current (A).
Rdson is the on-resistance of the high-side MOSFET (Ω).
VOUT is the output voltage (V).
VIN is the input voltage (V).
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