Rainbow-electronics MAX8562 Manual de usuario descargar pdf (Pagina 4)

MAX8560/MAX8561/MAX8562

4MHz, 500mA Synchronous Step-Down

DC-DC Converters in SOT and TDFN

4 _______________________________________________________________________________________

EFFICIENCY vs. LOAD CURRENT

OUT

= 1.2V)

MAX8560 toc04

LOAD CURRENT (mA)

EFFICIENCY (%)

100101

100

0.1 1000

4.7µH

2.2µH

1µH

EFFICIENCY vs. LOAD CURRENT

OUT

= 0.9V)

MAX8560 toc05

LOAD CURRENT (mA)

EFFICIENCY (%)

100101

100

0.1 1000

4.7µH

2.2µH

1µH

EFFICIENCY vs. LOAD CURRENT

(LOAD = 7.5Ω)

MAX8560 toc06

OUTPUT VOLTAGE (V)

EFFICIENCY (%)

2.01.51.0

100

0.5 2.5

4.7µH

2.2µH

1µH

NO-LOAD SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX8560 toc07

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

5.04.52.5 3.0 3.5 4.0

2.0 5.5

R1 = R2 = 100kΩ

SWITCHING FREQUENCY

vs. LOAD CURRENT

MAX8560 toc08

LOAD CURRENT (mA)

FREQUENCY (MHz)

100 200 300 400

0.1

0500

4.7µH

2.2µH

1µH

OUTPUT VOLTAGE vs. LOAD CURRENT

(VOLTAGE POSITIONING)

MAX8560 toc09

LOAD CURRENT (mA)

OUTPUT VOLTAGE (V)

400300100 200

1.17

1.18

1.19

1.20

1.21

1.22

1.23

1.24

1.16

0500

R1 = R2 = 100kΩ

LIGHT-LOAD SWITCHING WAVEFORMS

MAX8560 toc10

200ns/div

200mA/div

2V/div

OUT

20mV/div

50mA LOAD

HEAVY-LOAD SWITCHING WAVEFORMS

MAX8560 toc11

200ns/div

200mA/div

2V/div

OUT

20mV/div

200mA LOAD

Typical Operating Characteristics (continued)

= 3.6V, V

OUT

= 1.2V, L = 1µH (LQH32C-IRO), C

OUT

= 2.2µF, T

= +25°C, unless otherwise noted.)

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Rainbow-electronics MAX8562 Manual de usuario Pagina 4

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