Rainbow-electronics MAX8640Z Uživatelský manuál stáhnout pdf (Strana 3)

MAX8640Y/MAX8640Z

500mA, 4MHz/2MHz Synchronous

Step-Down DC-DC Converters in SC70

_______________________________________________________________________________________ 3

Typical Operating Characteristics

= 3.6V, V

OUT

= 1.5V, MAX8640Z, L = Murata LQH32CN series, T

= +25°C, unless otherwise noted.)

EFFICIENCY vs. LOAD CURRENT

1.8V OUTPUT

LOAD CURRENT (mA)

EFFICIENCY (%)

MAX8640Y/Z toc01

100

0.1 1 10 100 1000

MAX8640YEXT18

NO-LOAD SUPPLY CURRENT

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (μA)

MAX8640Y/Z toc02

2.9 3.3 3.7 4.1 4.5 4.9

MAX8640ZEXT15

MAX8640YEXT18

SWITCHING FREQUENCY

vs. LOAD CURRENT

LOAD CURRENT (mA)

SWITCHING FREQUENCY (MHz)

MAX8640Y/Z toc03

0 100 200 300 400 500

0.1

MAX8640ZEXT15

MAX8640YEXT18

OUTPUT VOLTAGE vs. LOAD CURRENT

(VOLTAGE POSITIONING)

LOAD CURRENT (mA)

OUTPUT VOLTAGE (V)

MAX8640Y/Z toc04

0 100 200 300 400 500

1.30

1.35

1.40

1.45

1.50

1.55

MAX8640ZEXT15

OUT

200mA/div

2V/div

20mV/div

(AC-COUPLED)

10μs/div

LIGHT-LOAD SWITCHING WAVEFORMS

OUT

= 1mA)

MAX8640Y/Z toc05

OUT

200mA/div

2V/div

0mA

20mV/div

(AC-COUPLED)

200ns/div

MEDIUM-LOAD SWITCHING WAVEFORMS

OUT

= 40mA)

MAX8640Y/Z toc06

OUT

200mA/div

2V/div

0mA

20mV/div

(AC-COUPLED)

200ns/div

HEAVY-LOAD SWITCHING WAVEFORMS

OUT

= 300mA)

MAX8640Y/Z toc07

1 2 3 4 5 6 7 8 9

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