3.3V, Step-Down,

Current-Mode PWM DC-DC Converters

4

_______________________________________________________________________________________

____________________________Typical Operating Characteristics (continued)

MAX763A

QUIESCENT SUPPLY CURRENT

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

0

1

2

3 4

5

6

7

8

9 10 11 12

IOUT = 0mA

TA = +125°C

TA = -55°C

TA = +25°C

MAX748A

QUIESCENT SUPPLY CURRENT

vs. SUPPLY VOLTAGE

5.0

4.0

3.0

2.0

1.0

0

SUPPLY VOLTAGE (V)

0

2

4

6

8

10

12

14

16

IOUT = OmA

TA = +125°C

TA = -55°C

TA = +25°C

PEAK INDUCTOR CURRENT

vs. OUTPUT CURRENT

0

200

400

600

800

1000

0 50 100 150 200 250 300 350 400 450 500 550

OUTPUT CURRENT (mA)

VIN = 11V

VIN = 6V

VIN = 8V

OSCILLATOR FREQUENCY

vs. SUPPLY VOLTAGE

100

125

150

250

175

200

225

275

0

2

4

6

8

10121416

SUPPLY VOLTAGE (V)

MAX748A

MAX763A

OUTPUT VOLTAGE

vs. OUTPUT CURRENT

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

0

50 100 150 200 250 300 350 400 450 500

OUTPUT CURRENT (mA)

VIN = 4.0V

VIN = 3.0V

VIN = 3.5V

SHUTDOWN CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

-60 -40 -20

0

20

40 60

80 100 120 140

IOUT = 0mA

V+ = 5V

NOTES 3, 4

OUTPUT VOLTAGE

vs. SUPPLY VOLTAGE

2.0

2.5

3.0

3.5

4.0

4.5

5.0

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

SUPPLY VOLTAGE (V)

ILOAD = 200mA

ILOAD = 50mA

ILOAD = 300mA

ILOAD = 500mA

OSCILLATOR FREQUENCY

vs. TEMPERATURE

0

50

100

150

200

250

300

-60 -40 -20

0

20

40 60 80 100 120 140

TEMPERATURE (°C)

MAX748A

MAX763A

IOUT = 100mA

V+ = 5V