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ADP1653
Table 11. Recommended Schottky Diodes
4.5
OUT = 6.3V,
V DD
= 3.2V
Vendor
ST
I PEAK
(A)
2
I AVE
(A)
1
V R
(V)
23
Part No.
BAT20J
Dimensions
L × W × H (mm)
1.65 × 1.25 × 1.0
4.0
3.5
OUT = 6.3V,
OUT = 8.3V,
OUT = 8.3V,
V DD
V DD
V DD
= 4.2V
= 3.2V
= 4.2V
3.3 μ H + 20%
Rohm
ON Semi
5
2
1
1
20
20
RB161VA-20
MBR120LSFT1
1.9 × 1.3 × 0.6
2.7 × 1.65 × 0.95
3.0
2.5
Philips
2
2
20
PMEG2020EJ
1.7 × 1.25 × 0.72
2.0
2.2 μ H + 20%
Selecting the Output Capacitor
1.5
The output capacitor maintains the output voltage and supplies
the HPLED current when the LX switch is on. It also stabilizes
1.0
0.5
OUT
OUT
OUT
= 6.3V,
= 6.3V,
= 8.3V,
V DD
V DD
V DD
= 3.2V
= 4.2V
= 3.2V
the loop. A 4.7 μF, 16 V X5R/X7R ceramic capacitor is generally
recommended. The minimum required capacitance for loop
0
0
100
200
OUT
300
= 8.3V, V DD
400
= 4.2V
5 00
stability for the two-LED and one-LED cases is shown in Figure 31
and Figure 32, respectively. Choose a capacitor with a capacitance
greater than the minimum shown in Figure 31 and Figure 32
for the worst-case dc bias voltage and temperature condition.
HPLED CURRENT, 2 LED CASE (mA)
Figure 31. Minimum Output Capacitance for L = 3.3 μH + 20% and
L = 2.2 μH + 20% for Two-LED Designs
Note that dc bias characterization data is available from
capacitor manufacturers and should be taken into account
when selecting input and output capacitors. 16 V capacitors are
recommended for most two-LED designs. Designs with 1 mm
height restrictions can also use 0603 case size, 16 V capacitors
in parallel.
4.0
3.5
3.0
2.5
2.0
OUT = 4.3V, V DD = 4.2V
OUT = 3.3V, V DD = 3.2V
2.2 μ H + 20%
Table 12. Recommended Output Capacitors
Dimensions
1.5
OUT = 4.3V, V DD = 3.2V
Vendor
Murata
TDK
Value
4.7 μF, 16 V
4.7 μF, 16 V
Part No.
GRM21BR61C475KA88
C2012X5R1C475K
L × W × H (mm)
2 × 1.25 × 1.25
2 × 1.25 × 1.25
1.0
0.5
Murata
TDK
4.7 μF, 10 V
4.7 μF, 10 V
GRM219R61A475KE34
C1608X5R1A475K
2 × 1.25 × 0.95
1.6 × 0.8 × 0.8
0
0
50
100 150 200 250 300 350 400
HPLED CURRENT, 1 LED CASE (mA)
450
500
Figure 32. Minimum Output Capacitance for L = 2.2 μH + 20%
for One-LED Design
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
–40°C (10V)
+85°C (10V)
0
0
2
4
6
8
10
1 2
DC BIAS (V)
Figure 33. DC Bias Characteristic of a 10 V, 4.7 μF Ceramic Capacitor
Rev. B | Page 19 of 24
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