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ILC7081AIM5 데이터시트(PDF) 8 Page - Fairchild Semiconductor

부품명 ILC7081AIM5
상세설명  50/100mA SOT-23 CMOS RF LDO Regulators
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제조업체  FAIRCHILD [Fairchild Semiconductor]
홈페이지  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

ILC7081AIM5 데이터시트(HTML) 8 Page - Fairchild Semiconductor

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ILC7080/81
8
REV. 1.0.7 4/3/03
The layout of the LDO and its external components are also
based on some simple rules to minimize EMI and output
voltage ripple.
Figure 8. Recommended application circuit schematic
Figure 9. Recommended application circuit layout
(not drawn to scale).
Note: ground plane is bottom layer of PCB and connects to
top layer ground connections through vias.
C
NOISE
0.01
µF
C
OUT
4.7
µF
ESR<0.5
C
IN
1
µF
ON/OFF
V
OUT
V
IN
V
BATT
ILC7080
5
23
1
4
SOT23-5
Ground Plane
Ground Plane
Ground Plane
Ground Plane
DC/DC
Converter
L
O
A
D
+
GND
Evaluation Board Parts List For Printed Circuit Board Shown Above
Grounding Recommendations
1.
Connect CIN between VIN of the ILC7080/81 and the “GROUND PLANE”.
2.
Keep the ground side of COUT and CNOISE connected to the “LOCAL GROUND” and not directly to the “GROUND
PLANE”.
3.
On multilayer boards use component side copper for grounding around the ILC7080/81 and connect back to a “GROUND
PLANE” using vias.
4.
If using a DC-DC converter in your design, use a star grounding system with separate traces for the power ground and the
control signals. The star should radiate from where the power supply enters the PCB.
Layout Considerations
1.
Place all RF LDO related components; ILC7080/81, input capacitor CIN, noise bypass capacitor CNOISE and output capac-
itor COUT as close together as possible.
2.
Keep the output capacitor COUT as close to the ILC7080/81 as possible with very short traces to the VOUT and GND pins.
3.
The traces for the related components; ILC7080/81, input capacitor CIN, noise bypass capacitor CNOISE and output capac-
itor COUT can be run with minimum trace widths close to the LDO.
4.
Maintain a separate “LOCAL GROUND” remote from the “GROUND PLANE” to ensure a quiet ground near the LDO.
Figure 9 shows how this circuit can be translated into a PCB layout.
Label
Part Number
Manufacturer
Description
U1
ILC7081AIM5-30
Fairchild Semi.
100mA RF LDOTM regulator
J1
69190-405
Berg
Connector, four position header
CIN
GRM40 Y5V 105Z16
muRata
Ceramic capacitor, 1
µF,16V, SMT (size 0805)
CNOISE
ECU-V1H103KBV
Panasonic
Ceramic capacitor, 0.01
µF,16V, SMT (size 0603)
COUT
GRM42-6X5R475K10
muRata
Ceramic capacitor, 4.7
µF,16V, SMT (size 1206)


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