Adjustable, Step-Down,

Current-Mode PWM Regulators

4

_______________________________________________________________________________________

0

0

MAX758A

PEAK INDUCTOR CURRENT

vs. OUTPUT CURRENT

200

1000

OUTPUT CURRENT (mA)

600

400

800

100 200 300 400 500 600 700 800

V+ = 6.6V

V+ 8.0V TO 16.0V

L1 = 100µH

C4 = 300µF

0

0

MAX758A

PEAK INDUCTOR CURRENT

vs. OUTPUT CURRENT

100

500

OUTPUT CURRENT (mA)

300

200

400

100

150

200

250

300

L1 = 18µH

C4 = 1000µF

600

700

50

V+ = 10.2V

V+ = 8.0V

V+ = 6.6V

V+ = 6.0V

150

4

OSCILLATOR FREQUENCY

vs. SUPPLY VOLTAGE

160

200

SUPPLY VOLTAGE (V)

180

170

190

810

12

14

16

210

220

6

MAX750A

MAX758A

(NOTE 3)

0

0

MAX758A

NO-LOAD SUPPLY CURRENT vs. SUPPLY VOLTAGE

0.5

2.5

SUPPLY VOLTAGE (V)

1.5

1.0

2.0

4

6

8

10

14

3.0

2

12

16

UNDERVOLTAGE

LOCKOUT V+ FALLING

(OPERATION ENDS)

UNDERVOLTAGE

LOCKOUT V+ RISING

(OPERATION BEGINS)

(NOTES 3, 5)

2.0

0

-60

60

NO-LOAD SUPPLY CURRENT

vs. TEMPERATURE

0.5

TEMPERATURE (°C)

-20

20

1.5

1.0

100

140

2.5

2.0

-40

0

40

80

120

MAX750A, V+ = 9.0V

MAX758A, V+ = 12.0V

(NOTES 4, 5)

8

0

-60

60

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

2

TEMPERATURE (°C)

-20

20

6

4

100

140

10

12

-40

0

40

80

120

14

16

18

20

MAX758A ONLY, V+ = 16V

MAX758A ONLY, V+ = 12V

V+ = 9V

V+ = 6V

(NOTES 4, 5)

_____________________________Typical Operating Characteristics (continued)

TEMPERATURE (°C)

MAX750A

OSCILLATOR FREQUENCY vs. TEMPERATURE

-60

20 40

80

120

-40 -20

0

60

100

140

240

200

180

160

220

0

140

V+ = 9.0V

V+ = 7.0V

(NOTE 4)

V+ = 5.5V

V+ = 11.0V

200

180

170

160

TEMPERATURE (°C)

MAX758A

OSCILLATOR FREQUENCY vs. TEMPERATURE

190

140

-60

20

40

80

120

-40 -20

0

60

100

140

150

130

120

V+ = 6.0V

V+ = 16.0V

V+ = 12.0V

V+ = 9.0V

(NOTE 4)