ILC7082 Impala Linear Corporation, ILC7082 Datasheet - Page 9

• Manufacturer Part Number: ILC7082
• Description: 150MA SOT-23 ULTRA LOW NOISE CMOS RF-LDO REGULATOR
• Manufacturer: Impala Linear Corporation

GROUNDING RECOMMENDATIONS
1. Connect C
“GROUND PLANE”.
2. Keep the ground side of C
“LOCAL GROUND” and not directly to the “GROUND PLANE”.
3. On multilayer boards use component side copper for
grounding around the ILC7082 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.
ILC7082 1.3
150mA SOT-23 Ultra Low Noise CMOS RF-LDO™ Regulator
Evaluation Board Parts List For Printed Circuit Board Shown Above
Pin Number
Impala Linear Corporation
Figure 8: Recommended application circuit schematic.
Cnoise
Cout
Cin
U1
J1
IN
between V
GRM42-6X5R475K10
GRM40 Y5V 105Z16
ECU-V1H103KBV
ILC7082AIM5-30
OUT
69190-405
Pin Name
IN
and C
of the ILC7082 and the
NOISE
connected to the
[phone]
Manufacturer
Impala Linear
Panasonic
muRata
muRata
Berg
LAYOUT CONSIDERATIONS
1. Place all RF LDO related components; ILC7082, input
capacitor C
capacitor C
2. Keep the output capacitor C
as possible with very short traces to the V
3. The traces for the related components; ILC7082, input
capacitor C
capacitor C
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.
www.impalalinear.com
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.
150mA RF LDO
Ceramic capacitor, 1 F,16V,SMT
Ceramic capacitor, 0.01 F,16V,SMT
Ceramic capacitor, 4.7 F16V,SMT
OUT
OUT
IN
IN
Connector, four position header
, noise bypass capacitor C
, noise bypass capacitor C
can be run with minimum trace widths close
as close together as possible.
Description
TM
regulator
OUT
as close to the ILC7082
(size 0805)
OUT
April 1999
NOISE
NOISE
(size 1206)
(size 0603)
and GND pins.
and output
and output
9