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The inductor saturation current should be rated around 1A,
which is the threshold of the internal current limit circuit. This
limit is reached only during the start-up and with heavy load
condition; when this event occurs the converter can shift over in
discontinuous conduction mode due to the automatic turn-off of
the switching transistor, resulting in higher ripple and reduced
ef?ciency.
Some recommended inductors are suggested in the table
below:
Inductor
PCB Layout Recommendations
The inherently high peak currents and switching frequency of
power supplies require careful PCB layout design. Therefore,
use wide traces for high current paths and place the input
capacitor, the inductor, and the output capacitor as close as
possible to the integrated circuit terminals. The resistor divider
that sets the output voltage should be routed away from the
inductor to avoid RF coupling. A four layer PCB with at least one
ground plane connected to the pin 2 of the IC is recommended.
This ground plane acts as an electromagnetic shield to reduce
EMI and parasitic coupling between components.
Value
10μH
Vendor
Panasonic
Part Number
ELL6GM100M
Comment
Lower Pro?le
(1.6mm)
10μH
Murata
LQS66SN100M03L
Highest
Ef?ciency
10μH
Coilcraft
DO1605T-103Mx
Small Size
Table 1: Recommended Inductors
Capacitors Selection
For best performance, low ESR input and output capacitors are
required. Ceramic capacitors in the range 4.7μF to 10μF, placed
as close to the IC pins, are recommended for the lower input
and output ripple. The output capacitor voltage rating should be
according to the V OUT setting.
A feed forward capacitor C F , is required for stability. The recom-
mended value (R 1 x C F ) is around 18μS. Some capacitors are
suggested in the table below.
Capacitor
Figure 5. Recommended Layout
Application Examples
1. LED Driver
One or more serial LED strings can be driven with a constant
current, set by the series resistor, given by
I LED = ----------------
Value
4.7μF
4.7μF
Vendor
Panasonic
Murata
Part Number
ECJ3YB1C475K
GRM31CR61C475
1.23V
R1
Table 2: Recommended Capacitors
Diode Selection
V IN
C IN
2.7V to 5.5V
L
10 μ H
BAT54
C OUT
V OUT
The external diode used for recti?cation is usually a Schottky
4.7 μ F
4.7 μ F
diode. Its average forward current and reverse voltage maxi-
mum ratings should exceed the load current and the voltage at
the output of the converter respectively. A barrier Schottky diode
such as BAT54 is preferred, due to its lower reverse current over
5
V
IN
SW
FB
1
3
the temperature range.
Care should be taken to avoid any short circuit of V OUT to GND,
ON
OFF
4
SHDN
GND
2
R1
R2
even with the IC disabled, since the diode can be instantly dam-
aged by the excessive current.
Thermal Shutdown
When the die temperature exceeds 150°C, a reset occurs and
will remain in effect until the die cools to 130°C, at that time the
circuit will be allowed to restart.
FAN5331 Rev. 1.0.1
7
Figure 6. Low Noise Boost LED Driver
www.fairchildsemi.com
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