Rainbow-electronics MAX1791 Manuel d'utilisateur télécharger pdf (Page 6)

MAX1762/MAX1791

High-Efficiency, 10-Pin µMAX, Step-Down

Controllers for Notebooks

6 _______________________________________________________________________________________

Typical Operating Characteristics

= +25°C, unless otherwise noted.)

100

0.1 1 10 100 1000 10,000

MAX1762

EFFICIENCY vs. LOAD (2.5V)

MAX1762/91 toc01

LOAD CURRENT (mA)

EFFICIENCY (%)

= 5V

= 12V

= 7V

= 18V

100

0.1 1 10 100 1000 10,000

MAX1791

EFFICIENCY vs. LOAD (3.3V)

MAX1762/91 toc05

LOAD CURRENT (mA)

EFFICIENCY (%)

= 18V

= 12V

= 7V

= 5V

100

0.1 1 10 100 1000 10,000

MAX1791

EFFICIENCY vs. LOAD (3.0V)

MAX1762/91 toc06

LOAD CURRENT (mA)

EFFICIENCY (%)

= 7V

= 18V

= 12V

= 5V

-0.6

-0.4

-0.5

-0.2

-0.3

-0.1

0.1

0105 152025

VL VOLTAGE ERROR vs. OUTPUT CURRENT

MAX1762/91 toc08

VL CURRENT (mA)

VL VOLTAGE ERROR (%)

= 12V

OUT

= 2.5V

100

0.1 1 10 100 1000 10,000

MAX1791

EFFICIENCY vs. LOAD (5V)

MAX1762/91 toc04

LOAD CURRENT (mA)

EFFICIENCY (%)

= 7V

= 18V

= 12V

250

275

325

300

350

375

FREQUENCY vs. SUPPLY VOLTAGE

MAX1762/91 toc07

SUPPLY VOLTAGE (V)

FREQUENCY (kHz)

51181417

OUT

= 3.3V

OUT

= 5.0V

OUT

= 2.5V

OUT

= 1.8V

LOAD = 1A

100

0.1 1 10 100 1000 10,000

MAX1762

EFFICIENCY vs. LOAD (1.8V)

MAX1762/91 toc02

LOAD CURRENT (mA)

EFFICIENCY (%)

= 18V

= 12V

= 5V

= 7V

100

0.1 1 10 100 1000 10,000

MAX1762

EFFICIENCY vs. LOAD (1V)

MAX1762/91 toc03

LOAD CURRENT (mA)

EFFICIENCY (%)

= 7V

= 12V

= 5V

= 18V

1 2 3 4 5 6 7 8 9 10 11 ... 19 20

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Rainbow-electronics MAX1791 Manuel d'utilisateur Page 6

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