ILC7080AIM5-285 IMPALA [Impala Linear Corporation], ILC7080AIM5-285 Datasheet - Page 9

• Manufacturer Part Number: ILC7080AIM5-285
• Description: 50/100M SOT-23 CMOS RF LDO REGULATORS
• Manufacturer: IMPALA [Impala Linear Corporation]

Grounding Recommendations
1.
2.
3.
4.
ILC7080/81 1.1
50/100mA SOT-23 CMOS RF LDO™ Regulators
Connect C
“GROUND PLANE”.
Keep the ground side of C
the “LOCAL GROUND” and not directly to the
“GROUND PLANE”.
On multilayer boards use component side copper for
grounding around the ILC7080/81 and connect back to a
“GROUND PLANE” using vias.
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.
Figure 8: Recommended application circuit schematic
Impala Linear Corporation
Evaluation Board Parts List For Printed Circuit Board Shown Above
IN
C
Label
C
C
NOISE
U1
J1
between V
OUT
IN
GRM40 Y5V 105Z16
ECU-V1H103KBV
ILC7081AIM5-30
IN
5
1
OUT
Part Number
6X5R475K10
of the ILC7080/81 and the
69190-405
2
GRM42-
and C
4
3
NOISE
[phone]
connected to
Manufacturer
Impala Linear
Panasonic
muRata
muRata
Berg
1.
2.
3.
4.
www.impalalinear.com
Layout Considerations
Place all RF LDO related components; ILC7080/81,
input capacitor C
output capacitor C
Keep the output capacitor C
ILC7080/81 as possible with very short traces to the
V
The traces for the related components; ILC7080/81,
input capacitor C
output capacitor C
widths close to the LDO.
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.
OUT
Figure 9:
(not drawn to scale). Note: ground plane is bottom layer
of PCB and connects to top layer ground connections
through vias
and GND pins.
100mA RF LDO™
Connector, four position header
Ceramic capacitor, 1µF, 16V, SMT
(size 0805)
Ceramic Capacitor, 0.01µF, 16V,
SMT (size 0603)
Ceramic Capacitor, 4.7µF, 16V, SMT
(size 1206)
Recommended application circuit layout
IN
IN
OUT
, noise bypass capacitor C
, noise bypass capacitor C
OUT
Description
as close together as possible.
can be run with minimum trace
OUT
Sept. 1998
as close to the
NOISE
NOISE
and
and
9