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APL5537MMQBI-TRG Datasheet(PDF) 10 Page - Anpec Electronics Coropration

Part # APL5537MMQBI-TRG
Description  Dual Channel 300mA Low Dropout Linear Regulator
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Manufacturer  ANPEC [Anpec Electronics Coropration]
Direct Link  http://www.anpec.com.tw
Logo ANPEC - Anpec Electronics Coropration

APL5537MMQBI-TRG Datasheet(HTML) 10 Page - Anpec Electronics Coropration

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Copyright
© ANPEC Electronics Corp.
Rev. A.7 - Oct., 2011
www.anpec.com.tw
10
APL5537
Input Capacitor
Application Information
The APL5537 requires proper input capacitors to supply
surge current during stepping load transients to prevent
the input rail from dropping. Because the parasitic induc-
tor from the voltage sources or other bulk capacitors to
the VIN limit the slew rate of the surge current, place the
Input capacitors near VIN as close as possible. Input ca-
pacitors should be larger than 1
µF and a minimum ce-
ramic capacitor of 1
µF is necessary.
Output Capacitor
The APL5537 needs a proper output capacitor to main-
tain circuit stability and improve transient response over
temperature and current. In order to insure the circuit
stability, the proper output capacitor value should be larger
than 1
µF. With X5R and X7R dielectrics, 1µF is sufficient
at all operating temperatures. Large output capacitor
value can reduce noise and improve load-transient re-
sponse and PSRR, Figure 1 shows the curves of allow-
able ESR range as the function of load current for various
output capacitor values.
Figure1. Stable C
OUT ESR Range
Operation Region and Power Dissipation
The APL5537 maximum power dissipation depends on
the thermal resistance and temperature difference be-
tween the die junction and ambient air. The TDFN1.6x
1.6-6 package power dissipation P
D across the device is:
P
D = (TJ - TA) / θJA
where (T
J-TA) is the temperature difference between the
junction and ambient air.
θ
JA is the thermal resistance
between Junction and ambient air. Assuming the T
A=25
oC
and maximum T
J=160
oC (typical thermal limit threshold),
the maximum power dissipation is calculated as:
P
D(max)=(160-25)/165 = 0.82(W)
For normal operation, do not exceed the maximum junc-
tion temperature rating of T
J = 125
oC. The calculated
power dissipation should be less than:
P
D =(125-25)/165 = 0.61(W)
The GND provides an electrical connection to the ground
and channels heat away. Connect the GND to the ground
by using a large pad or a ground plane.
Layout Consideration
Figure 2 illustrates the layout. Below is a checklist for
your layout:
1. Please place the input capacitors close to the VIN.
2. Ceramic capacitors for load must be placed near the
load as close as possible.
3. To place APL5537 and output capacitors near the load
is good for performance.
4. Large current paths, the bold lines in figure 2, must
have wide tracks.
V
IN
V
OUT1
C
IN
C
OUT1
VIN
VOUT1
GND
APL5537
V
OUT2
C
OUT2
VOUT2
EN1
EN2
ON
OFF
Figure2. Large Current Paths
Output Current (mA)
Region of Stable C
OUT ESR vs. Output Current
APL5537-OC
V
IN=VEN=4.2V
C
IN=COUT=1µF/X7R
Unstable Range
Stable Range
Stable by Simulation Verify
0
50
100
150
200
250
300
0.001
0.01
0.1
1
10


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