NCV8702
400
350
300
250
200
150
0.8
0.7
0.6
0.5
0.4
0.3
P
, T = 25°C, 2 OZ CU
A
D(MAX)
P
, T = 25°C, 1 OZ CU
A
D(MAX)
q
q
, 1 OZ CU
, 2 OZ CU
JA
JA
100
50
0.2
0.1
0
100
200
300
400
500
600
700
800
2
PCB COPPER AREA (mm )
Figure 63. qJA and PD(MAX) vs. Copper Area (XDFN6)
400
Load Regulation
V
= 3.3 V
OUT
The NCV8702 features very good load regulation of
maximum 2.6 mV in the 0 mA to 200 mA range. In order to
achieve this very good load regulation a special attention to
PCB design is necessary. The trace resistance from the OUT
pin to the point of load can easily approach 100 mΩ which
will cause a 20 mV voltage drop at full load current,
deteriorating the excellent load regulation.
360
320
280
240
200
160
120
80
V
= 0.8 V
OUT
V
OUT
= 1.8 V
V
IN
= V
+ 0.3 V or 2 V
Line Regulation
The IC features very good line regulation of 0.44 mV/V
OUT
I
= 10 mA
OUT
C
= C
= 1 mF
IN
OUT
measured from V = V
operated applications it may be important that the line
+ 0.3 V to 5.5 V. For battery
IN
OUT
40
V
EN
= 0 V −> 0.9 V
0
−40 −20
0
20
40
60
80
100 120 140
regulation from V = V
+ 0.3 V up to 4.5 V is only
IN
OUT
0.29 mV/V.
T , JUNCTION TEMPERATURE (°C)
J
Figure 64. Turn−On Time vs. Temperature
Power Supply Rejection Ratio
The NCV8702 features very good Power Supply
Rejection ratio. If desired the PSRR at higher frequencies in
the range 100 kHz – 10 MHz can be tuned by the selection
Internal SoftStart
The Internal Soft−Start circuitry will limit the inrush
current during the LDO turn-on phase. Please refer to
Figure 43 for typical inrush current values for given output
capacitance.
of C
capacitor and proper PCB layout.
OUT
Output Noise
The soft−start function prevents from any output voltage
overshoots and assures monotonic ramp-up of the output
voltage.
The IC is designed for ultra−low noise output voltage.
Figures 3 – 8 illustrate the noise performance for different
V
, I
, C
. Generally the noise performance in the
OUT OUT OUT
indicated frequency range improves with increasing output
current, although even at I = 1 mA the noise levels are
PCB Layout Recommendations
To obtain good transient performance and good regulation
OUT
below 22 mV
.
RMS
characteristics place C and C
capacitors close to the
IN
OUT
device pins and make the PCB traces wide. In order to
minimize the solution size use 0402 capacitors. Larger
copper area connected to the pins will also improve the
device thermal resistance. The actual power dissipation can
be calculated by the formula given in Equation 2.
Turn−On Time
The turn−on time is defined as the time period from EN
assertion to the point in which V will reach 98% of its
OUT
nominal value. This time is dependent on V
,
OUT(NOM)
C
OUT
, T . The turn−on time temperature dependence is
A
shown below:
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