MAX8640Y 查看數據表（PDF） - Maxim Integrated

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MAX8640Y

Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters

Maxim Integrated 

MAX8640Y/MAX8640Z

Tiny 500mA, 4MHz/2MHz Synchronous

Step-Down DC-DC Converters

Typical Operating Characteristics

(VIN = 3.6V, VOUT = 1.5V, MAX8640Z, L = Murata LQH32CN series, TA = +25°C, unless otherwise noted.)

EFFICIENCY vs. LOAD CURRENT

1.8V OUTPUT

100

MAX8640YEXT18

90

80

70

60

50

40

30

20

10

0

0.1

1

10

100

1000

LOAD CURRENT (mA)

NO-LOAD SUPPLY CURRENT

vs. SUPPLY VOLTAGE

35

MAX8640YEXT18

30

25

MAX8640ZEXT15

20

15

10

5

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

SUPPLY VOLTAGE (V)

SWITCHING FREQUENCY

vs. LOAD CURRENT

10

MAX8640ZEXT15

1

MAX8640YEXT18

0.1

0

100 200 300 400 500

LOAD CURRENT (mA)

OUTPUT VOLTAGE vs. LOAD CURRENT

(VOLTAGE POSITIONING)

1.55

MAX8640ZEXT15

1.50

LIGHT-LOAD SWITCHING WAVEFORMS

(IOUT = 1mA)

MAX8640Y/Z toc05

VOUT

20mV/div

(AC-COUPLED)

1.45

VLX

2V/div

1.40

1.35

1.30

0

100 200 300 400 500

LOAD CURRENT (mA)

MEDIUM-LOAD SWITCHING WAVEFORMS

(IOUT = 40mA)

MAX8640Y/Z toc06

VOUT

20mV/div

(AC-COUPLED)

ILX

200mA/div

10μs/div

HEAVY-LOAD SWITCHING WAVEFORMS

(IOUT = 300mA)

MAX8640Y/Z toc07

VOUT

20mV/div

(AC-COUPLED)

2V/div

VLX

2V/div

VLX

0V

0V

200mA/div

ILX

200mA/div

ILX

0mA

0mA

200ns/div

200ns/div

Maxim Integrated

3

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