MAX8640YEXT25T(2007-07) View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX8640YEXT25T
(Rev.:2007-07)

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

Maxim Integrated 

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

20

15

MAX8640ZEXT15

10

5

2.9 3.3 3.7 4.1 4.5 4.9

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

1.40

2V/div

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)

VLX

2V/div

0V

ILX

200mA/div

0mA

200ns/div

2V/div

VLX

0V

200mA/div

ILX

0mA

200ns/div

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