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| 型号： | AS1340A-BTDT-10 |
| 厂商： | AUSTRIAMICROSYSTEMS AG |
| 元件分类： | DC/DC变换器 |
| 英文描述： | 50V, 100mA, 1MHz, Boost |
| 文件页数： | 13/17页 |
| 文件大小： | 765K |
| 代理商： | AS1340A-BTDT-10 |
wwwaustriamcrosystems.com/DC-DC_Step-Up/AS1340
Revision 1.12
13 - 17
AS1340
Datasheet - Application Information
9.7 Capacitor Selection
A 4.7μF capacitor is recommended for C
IN
as well as a 2μF for C
OUT
. Small-sized ceramc capacitors are recommended. X5R and X7R
ceramc capacitors are recommend as they retain capacitance over wide ranges of voltages and temperatures.
9.7.1 Output Capacitor Selection
Low ESR capacitors should be used to mnimze V
OUT
ripple. Multi-layer ceramc capacitors are recommended since 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 transient response.
X5R and X7R dielectric materials are recommended due to their ability to maintain capacitance over wide voltage and temperature ranges.
9.7.2 Input Capacitor Selection
Low ESR input capacitors reduce input switching noise and reduce the peak current drawn fromthe battery. Ceramc 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 limtations.
9.7.3 Diode Selection
A Schottky diode must be used to carry the output current for the time it takes the PMOS synchronous rectifier to switch on.
Note:
Do not use ordinary rectifier diodes, since the slow recovery times will compromse efficiency.
9.8 Thermal Protection
To protect the device fromshort circuit or excessive power dissipation of the auxiliary NPNs, the integrated thermal protection switches off the
device when the junction temperature (T
J
) reaches 145oC (typ). When T
J
decreases to approximately 125oC, the device will resume normal
operation. If the thermal overload condition is not corrected, the device will switch on and off while maintaining T
J
within the range between
125oC and 145oC.
Table 5. Recommended Output Capacitor
Part Number
C
TC Code
Rated Voltage
Dimensions (L/W/T)
Manufacturer
Murata
wwwmurata.com
GRM31MR71H105KA88
1μF
X7R
50V
C1206
GRM32ER71H475KA88
4.7μF
X7R
50V
C1210
C1206C105K5RAC
1μF
X7R
50V
C1206
Kemet
wwwkemet.com
C1206C225K5RAC
2.2μF
X7R
50V
C1210
1206C105KAT2A
1μF
X7R
50V
C1206
AVX
wwwavx.com
Table 6. Recommended Input Capacitor
Part Number
C
TC Code
Rated Voltage
Dimensions (L/W/T)
Manufacturer
GRM21BR71C105KA01
1μF
X7R
16V
C0805
GRM21BR61C225KA882.2μF
X7R
16V
C0805
GRM32DR71C106KA01
10μF
X7R
16V
C1210
Table 7. Recommended Diodes
Part Number
Reverse Voltage
Forward Current
Package
Manufacturer
PMEG4010BEA
40V
1A
SOD123
Philips
wwwnxp.com
MCC
wwwmccsem.com
MBR0540
40V
500mA
SOD123
MBR0560
60V
500mA
SOD123
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