Rainbow-electronics MAX8668 Bedienungsanleitung PDF herunterladen (Seite 4)

MAX8667/MAX8668

1.5MHz Dual Step-Down DC-DC Converters

with Dual LDOs and Individual Enables

4 _______________________________________________________________________________________

Typical Operating Characteristics

IN12

= V

IN34

= 3.6V, circuit of Figure 4, V

OUT1

= 1.2V, V

OUT2

= 1.8V, V

OUT3

= 2.8V, V

OUT4

= 2.8V, T

= +25°C, unless otherwise noted.)

OUT1 EFFICIENCY vs. LOAD CURRENT

OUT1

= 1.2V)

MAX8667/88 toc01

LOAD CURRENT (mA)

EFFICIENCY (%)

101

0.1 1000100

ONLY OUT1 ENABLED

OUT2 EFFICIENCY vs. LOAD CURRENT

OUT2

= 1.8V)

MAX8667/88 toc02

LOAD CURRENT (mA)

EFFICIENCY (%)

1000100101

0.1 10000

ONLY OUT2 ENABLED

0.80

0.90

0.85

1.05

1.00

0.95

1.20

1.15

1.10

1.25

0 200100 300 400 500 600

OUT1 LOAD REGULATION

MAX8667/88 toc03

LOAD CURRENT (mA)

OUTPUT VOLTAGE (V)

1.20

1.40

1.30

1.60

1.50

1.80

1.70

1.90

0 400 600200 800 1000 1200

OUT2 LOAD REGULATION

MAX8667/88 toc04

LOAD CURRENT (mA)

OUTPUT VOLTAGE (V)

1.00

1.05

1.10

1.15

1.20

1.25

1.30

1.35

1.40

2.5 3.53.0 4.0 4.5 5.0 5.5

OUT1 OUTPUT VOLTAGE

vs. INPUT VOLTAGE (600mA LOAD)

MAX8667/88 toc05

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

1.60

1.65

1.70

1.75

1.80

1.85

1.90

1.95

2.00

2.5 3.53.0 4.0 4.5 5.0 5.5

OUT2 OUTPUT VOLTAGE

vs. INPUT VOLTAGE (1200mA LOAD)

MAX8667/88 toc06

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

1000

500

2000

1500

3000

2500

3500

0 600 900300 1200 1500 1800

SWITCHING FREQUENCY

vs. LOAD CURRENT

MAX8667/88 toc07

LOAD CURRENT (mA)

SWITCHING FREQUENCY (kHz)

OUT2

OUT1

100

120

1.5 2.52.0 3.0 3.5 4.0 4.5 5.0 5.5

NO-LOAD SUPPLY CURRENT vs. SUPPLY

VOLTAGE ALL REGULATOR ENABLED

MAX8667/88 toc08

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (μA)

SUPPLY VOLTAGE

RISING

SUPPLY VOLTAGE

FALLING

100

120

1.5 2.52.0 3.0 3.5 4.0 4.5 5.0 5.5

NO-LOAD SUPPLY CURRENT

vs. SUPPLY VOLTAGE OUT1 AND OUT2 ONLY

MAX8667/88 toc09

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (μA)

SUPPLY VOLTAGE

RISING

SUPPLY VOLTAGE

FALLING

1 2 3 4 5 6 7 8 9 ... 17 18

MAX8667/MAX8668 1

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