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ADP5501
Component Selection
The ADP5501 boost converter is designed for use with a 4.7 μH
inductor. Choose an inductor with a sufficient current rating to
prevent it from going into saturation. The peak current limit of
the ADP5501 is 750 mA (maximum), so choose an inductor
with a greater saturation rating. To maximize efficiency, choose
an inductor with a low series resistance (DCR).
The ADP5501 is an asynchronous boost and, as such, requires
an external Schottky diode to conduct the inductor current to
the output capacitor and LED string when the power switch is
off. Ensure that the Schottky diode peak current rating is greater
than the maximum inductor current. Choose a Schottky diode
with an average current rating that is significantly larger than
the maximum LED current. To prevent thermal runaway, derate
the Schottky diode to ensure reliable operation at high junction
PCB LAYOUT
Good PCB layout is important to maximize efficiency and to
minimize noise and electromagnetic interference (EMI). To
minimize large current loops, place the input capacitor, inductor,
Schottky diode, and output capacitor as close as possible to each
other and to the ADP5501 using wide tracks (use shapes where
possible).
For thermal relief, the exposed pad of the LFCSP package
should be connected to ground (GND). PGND and GND
should be connected to each other at the bottom of the output
capacitor.
Figure 46 shows an example PCB layout with the main power
components required for backlight driving
EXAMPLE CIRCUIT
temperatures. To maximize efficiency, select a Schottky diode
2.7V TO 5.5V
1μF
with a low forward voltage. When the power switch is on, the
Schottky diode blocks the dc path from the output capacitor to
1μF
4.7μH
2
22
23
ground. Therefore, choose a Schottky diode with a reverse
1 PGND
SW
BST
BL_SNK
breakdown greater than the maximum boost voltage. A 40 V,
1 A Schottky diode is recommended.
The input capacitor carries the input ripple current, allowing
the input power source to supply only the dc current. Use an
3.3V
21 VBAT
16 VDDIO
5 SCL
ADP5501
CAP_OUT 20
GND 19
GND 18
GND 24
1μF
input capacitor with sufficient ripple current rating to handle
the inductor ripple. A 1 μF X5R/X7R ceramic capacitor rated
4 SDA
3 INT
CMP_IN 17
100nF
for 16 V dc bias is recommended for the input capacitance.
The output capacitor maintains the output voltage when the
15 RST
NC NC NC NC NC NC
6 7 8 9 10 11
LED1
12
RGB
LED2
13
LED0
14
3.3V
Schottky diode is not conducting. Due to the high levels of
boost voltage required, a 1 μF X5R/X7R ceramic capacitor rated
for 50 V dc bias is recommended for output capacitance.
Note that dc bias characterization data is available from
capacitor manufacturers and should be taken into account
when selecting input and output capacitors.
GND
VBAT
GND
PGND
SW
GND
GND
CMP_IN
Figure 45. Typical Configuration Circuit
TOP OF LED STRING
BOTTOM OF LED STRIN G
3.3V
INT
ADP 5501
VDDIO
SOLUTION SIZE
APPROXIMATELY 47mm 2
SDA
SCL
NC
CONNE CT
EXPO SED
PAD TO GND
RST
LED0
LED2
Figure 46. Example PCB Layout
Rev. 0 | Page 27 of 28
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