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AS1322

Data Sheet

Output Capacitor Selection

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.

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.

Diode Selection

A Schottky diode should be used to carry the output current for the time it takes the PMOS synchronous rectifier to

Note: Do not use ordinary rectifier diodes, since the slow recovery times will compromise efficiency.

Table 6. Recommended Output Capacitor

Part Number

C

TC Code

Rated Voltage

Dimensions (L/W/T)

Manufacturer

JMK212BJ226MG-T

22µF ±20%

X5R

6.3V

2x1.3x1.3mm

Taiyo Yuden

www.t-yuden.com

Table 7. Recommended Input Capacitor

Part Number

C

TC Code Rated Voltage

Dimensions (L/W/T)

Manufacturer

GRM31CR70J106KA01L 10µF ±10%

X7R

6.3V

3.2x1.6x1.6mm

Murata

www.murata.com

100

10

76

78

80

82

84

86

88

90

92

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)

Si

8

40

45

50

55

60

65

70

75

80

85

90

0.1

1

10

Output Current (mA)

10uH - Coi l c r af t (M OS6020-103M L)

10uH - Sumi da(C DRH4D18-100)

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(CDRH4D18-4R 7)

3. 3 uH - Coi l c r af t (M OS6020-332M L)