MAX747CSLASHD datasheet(3/12 Pages) MAXIM

3 / 12 page

High-Efficiency PWM, Step-Down

P-Channel DC-DC Controller

_______________________________________________________________________________________

-75

SUPPLY CURRENT vs.

TEMPERATURE

TEMPERATURE (°C)

-50 -25

100 125

VIN = 9V

VOUT = 5V

SCHOTTKY DIODE

LEAKAGE EXCLUDED

ENTIRE

CIRCUIT

0.6

SUPPLY CURRENT vs.

SUPPLY VOLTAGE

0.7

SUPPLY VOLTAGE (V)

0.9

0.8

711

1.0

0.4

CONTINUOUS-CONDUCTION MODE BOUNDARY

AND CORRESPONDING PEAK INDUCTOR CURRENT (VOUT = 3.3V)

OUTPUT CURRENT (A)

1.2

0.6

1.0

1.4

0.8

CONTINUOUS

CONDUCTION

REGION

VOUT = 3.3V

L = 33µH

RSENSE = 50mΩ

DISCONTINUOUS

CONDUCTION

REGION

PEAK

INDUCTOR

CURRENT

0.4

0.8

1.6

1.2

2.0

0.5

CONTINUOUS-CONDUCTION MODE BOUNDARY

AND CORRESPONDING PEAK INDUCTOR CURRENT (VOUT = 5V)

OUTPUT CURRENT (A)

0.7

1.3

1.1

0.9

CONTINUOUS

CONDUCTION

REGION

PEAK INDUCTOR

CURRENT

VOUT = 5V

L = 50µH

RSENSE = 50mΩ

DISCONTINUOUS

CONDUCTION

REGION

0.4

0.8

1.6

1.2

2.0

100

0.01

0.1

EFFICIENCY vs. OUTPUT CURRENT

(VOUT = 5V)

OUTPUT CURRENT (A)

VIN = 12V

VIN = 9V

VIN = 6V

0.01

0.1

PEAK INDUCTOR CURRENT vs.

OUTPUT CURRENT (VOUT = 5V)

OUTPUT CURRENT (A)

VIN = 12V

VIN = 9V

VIN = 6V

0.01

0.1

PEAK INDUCTOR CURRENT vs.

OUTPUT CURRENT (VOUT = 3.3V)

OUTPUT CURRENT (A)

VIN = 9V

VIN = 6V

VIN = 5V

100

0.01

0.1

EFFICIENCY vs. OUTPUT CURRENT

(VOUT = 3.3V)

OUTPUT CURRENT (A)

VIN = 6V

VIN = 9V

VIN = 12V

__________________________________________Typical Operating Characteristics

(Circuit of Figure 1, V+ = 9V, TA = +25°C, unless otherwise noted.)

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