High-Efficiency, PWM, Step-Down,

N-Channel DC-DC Controller

4

_______________________________________________________________________________________

N0-LOAD SUPPLY CURRENT

vs. SUPPLY VOLTAGE

0.8

0.9

1.0

1.1

1.2

57

9

11

13

15

SUPPLY VOLTAGE (V)

0

-75

NO-LOAD SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

3

1

4

2

-50 -25

0

25

50

75

100 125

V+ = 9V

ENTIRE

CIRCUIT

SCHOTTKY DIODE

LEAKAGE EXCLUDED

4

0

0.01

PEAK INDUCTOR CURRENT

vs. OUTPUT CURRENT

1

2

OUTPUT CURRENT (A)

3

0.1

1

10

VIN = 12V

VIN = 9V

VIN = 6V

CIRCUIT OF FIGURE 1a

1.5

0

0.01

PEAK INDUCTOR CURRENT

vs. OUTPUT CURRENT

0.5

OUTPUT CURRENT (A)

1.0

0.1

1

CIRCUIT OF FIGURE 1c

VOUT = 5V

VIN = 12V

VIN = 6V

10

100

70

0.01

EFFICIENCY vs. OUTPUT CURRENT

80

OUTPUT CURRENT (A)

90

0.1

1

10

VIN = 12V

VIN = 9V

VIN = 6V

CIRCUIT OF FIGURE 1a

4

0

0.01

PEAK INDUCTOR CURRENT

vs. OUTPUT CURRENT

1

2

OUTPUT CURRENT (A)

3

0.1

1

10

CIRCUIT OF FIGURE 1b

VOUT = 3.3V

V+ = 5V

100

70

0.01

EFFICIENCY vs. OUTPUT CURRENT

80

OUTPUT CURRENT (A)

90

0.1

1

10

CIRCUIT OF FIGURE 1c

VIN = 12V

VIN = 6V

VOUT = 5V

100

70

0.01

EFFICIENCY vs. OUTPUT CURRENT

80

OUTPUT CURRENT (A)

90

0.1

1

10

CIRCUIT OF FIGURE 1b

VOUT = 3.3V

V+ = 5V

CONTINUOUS-CONDUCTION MODE

BOUNDARY AND CORRESPONDING

PEAK INDUCTOR CURRENT

5

7

9

11

13

0.7

OUTPUT CURRENT (A)

15

0.9

1.1

1.3

1.5

1.7

DISCONTINUOUS-

CONDUCTION REGION

CONTINUOUS-

CONDUCTION

REGION

PEAK

INDUCTOR

CURRENT

__________________________________________Typical Operating Characteristics