AS1322_1 AMSCO [austriamicrosystems AG], AS1322_1 Datasheet - Page 12

• Manufacturer Part Number: AS1322_1
• Description: Low Voltage, Micropower, DC-DC Step-Up Converters
• Manufacturer: AMSCO [austriamicrosystems AG]

AS1322
Data Sheet
Figure 20. Efficiency Comparison of Different Inductors, V
Output Capacitor Selection
Low ESR capacitors should be used to minimize V
they have extremely low ESR and are available in small footprints. A 2.2 to 10µF output capacitor is sufficient for most
applications. Larger values up to 22µF may be used to obtain extremely low output voltage ripple and improve tran-
sient response.
An additional phase lead capacitor may be required with output capacitors larger than 10µF to maintain acceptable
phase margin. X5R and X7R dielectric materials are recommended due to their ability to maintain capacitance over
wide voltage and temperature ranges.
Table 6. Recommended Output Capacitor
Input Capacitor Selection
Low ESR input capacitors reduce input switching noise and reduce the peak current drawn from the battery. Ceramic
capacitors are recommended for input decoupling and should be located as close to the device as is practical. A 4.7µF
input capacitor is sufficient for most applications. Larger values may be used without limitations.
Table 7. Recommended Input Capacitor
Diode Selection
A Schottky diode should be used to carry the output current for the time it takes the PMOS synchronous rectifier to
switch on. For V
Note: Do not use ordinary rectifier diodes, since the slow recovery times will compromise efficiency.
www.austriamicrosystems.com
GRM31CR70J106KA01L 10µF ±10%
JMK212BJ226MG-T
90
85
80
75
70
65
60
55
50
45
40
Part Number
Part Number
0.1
- A p p l i c a t i o n I n f o r m a t i o n
OUT
Output Current (mA)
< 4.5V a Schottky diode is optional, although using one will increase device efficiency by 2 to 3%.
22µF ±20%
1
10uH - Coi l cr af t (M OS6020-103M L)
10uH - Sumi da(CDRH4D18-100)
6. 8uH - Sumi da(CDRH4D18-6R8)
6. 8uH - Sumi da(CR43-6R8)
4. 7uH - Coi l cr af t (M OS6020-472M L)
4. 7 uH - Sumi da(CDRH4D18-4R7)
3. 3 uH - Coi l cr af t (M OS6020-332M L)
C
C
TC Code Rated Voltage Dimensions (L/W/T)
TC Code Rated Voltage
X7R
X5R
10
OUT
Revision 1.07
ripple. Multi-layer ceramic capacitors are recommended since
6.3V
IN
6.3V
= 1.5V, V
92
90
88
86
84
82
80
78
76
OUT
Dimensions (L/W/T)
10
3.2x1.6x1.6mm
= 3.3V
2x1.3x1.3mm
Output Current (mA)
10uH - Coi l cr af t (M OS6020-103M L)
10uH - Sumi da(CDRH4D18-100)
6. 8uH - Sumi da(CDRH4D18-6R8)
6. 8uH - Sumi da(CR43-6R8)
4. 7uH - Coi l c r af t (M OS6020-472M L)
4. 7 uH - Sumi da(CDRH4D18-4R7)
3. 3 uH - Coi l c r af t (M OS6020-332M L)
S
Murata
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Taiyo Yuden
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Manufacturer
Manufacturer
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