ILC6363 Datasheet, PDF (8/14 Pages) Fairchild Semiconductor – Step-Up DC-DC Converter for One-Cell Lithium-Ion Batteries

PRODUCT SPECIFICATION
ILC6363
Description
T495 series tantalum
595D series tantalum
TAJ, TPS series
tantalum
X5R Ceramic
X7R Ceramic
Vendor
Kemet
Sprague
AVX
TDK
AVX
muRata
Contact
[phone]
[phone]
[phone]
[phone]
[phone]
www.murata.com
Layout and Grounding
Considerations
High frequency switching and large peak currents means
PCB design for DC-DC converters requires careful
consideration. As a general rule place the DC-DC converter
circuitry well away from any sensitive RF or analog compo-
nents. The layout of the DC-DC converters and its external
components are also based on some simple rules to minimize
EMI and output voltage ripple.
Layout
1. Place all power components, ILC6363, inductor, input
capacitor and output capacitor as close together as
possible.
2. Keep the output capacitor as close to the ILC6363 as
possible with very short traces to the V_OUT and GND
pins. Typically it should be within 0.25 inches or 6mm.
3. Keep the traces for the power components wide,
typically >50mil or 1.25mm.
4. Place the external networks for LBI and VFB close to
the ILC6363, but away from the power components as
far as possible.
Grounding
1. Use a star grounding system with separate traces for
the power ground and the low power signals such as
LBI/SD and VFB. The star should radiate from where
the power supply enters the PCB.
2. On multilayer boards use component side copper for
grounding around the ILC6363 and connect back to a
quiet ground plane using vias.
CIN
100µF ^L1
VIN
15 µH
ILC6363
1
LX
2 VIN
VOUT ⁸
GND 7
+ COUT
100µF
R1
VOUT
R3
3 _{LBI/SD LBO} 6
ON/OFF
PWM
4 _SEL
VFB ⁵
PFM
R2
Local "Quiet" Ground
Power Ground
Figure 11. Recommended Application Circuit
Schematic for ILC6363CIR-ADJ
C2 ^{100µF L1}
15µH
VIN
ON
OFF
SEL
PWM
PFM
GND
U1
ILC6363XX
1 LX
2 _VIN
3 LBI
VOUT 8
GND 7
LBO 6
C1
100µF
R3
10K
VOUT
R1
10K
LBO
4 SEL POK/VFB 5
POK
REV. 1.3.5 5/21/02
C2 ^{100µF L1}
15µH
VIN
ON
OFF
SEL
PWM
PFM
GND
U1
ILC6363ADJ
1 LX
2 VIN
3 LBI
VOUT 8
GND 7
LBO 6
C1
100µF
R3
10K
4 SEL POK/VFB 5
VOUT
R1
LBO
VFB
R2
NOTE: R1 and R2 are user determined values to set
VOUT = VFB(1+R1/R2)
R1+R2 ≤ 100kΩ
8