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MAX8732A

High-Efficiency, Quad-Output, Main Power-Supply Controllers for Notebook Computers

Maxim Integrated 

High-Efficiency, Quad-Output, Main Power-

Supply Controllers for Notebook Computers

Typical Operating Characteristics (continued)

(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, SHDN = V+,

RCS = 7mΩ, VILIM_ = 0.5V, TA = +25°C, unless otherwise noted.)

MAX8732A

MAX8732A

3.3V OUTPUT SWITCHING FREQUENCY

5V OUTPUT SWITCHING

3.3V OUTPUT SWITCHING

vs. LOAD CURRENT (MAX8732A)

FREQUENCY vs. LOAD CURRENT

FREQUENCY vs. LOAD CURRENT

360

VIN = 7V

320

280 PWM MODE

250

225

200 PWM MODE

VIN = 24V

360

320

PWM MODE

280

VIN = 24V

240

175

240

150

200

200

125

160

100

160

120

75

120

80

ULTRASONIC MODE

50

ULTRASONIC MODE

40

25

PFM MODE

PFM MODE

0

0

0.001

0.01

0.1

1

10

0.001 0.01

0.1

1

10

LOAD CURRENT (A)

LOAD CURRENT (A)

80

ULTRASONIC MODE

40

PFM MODE

0

0.001 0.01

0.1

1

10

LOAD CURRENT (A)

MAX8733A

5V OUTPUT SWITCHING

FREQUENCY vs. LOAD CURRENT

450

VIN = 7V

400

PWM MODE

350

300

250

MAX8733A

3.3V OUTPUT SWITCHING

FREQUENCY vs. LOAD CURRENT

550

500 VIN = 7V

450

PWM MODE

400

350

300

MAX8733A

5V OUTPUT SWITCHING

FREQUENCY vs. LOAD CURRENT

450

VIN = 24V

400

350 PWM MODE

300

250

200

250

200

150

200

150

100

150

100

ULTRASONIC MODE

50

PFM MODE

0

100 ULTRASONIC MODE

50

PFM MODE

0

ULTRASONIC MODE

50

PFM MODE

0

0.001 0.01

0.1

1

10

0.001

0.01

0.1

1

10

0.001 0.01

0.1

1

10

LOAD CURRENT (A)

LOAD CURRENT (A)

LOAD CURRENT (A)

MAX8733A

3.3V OUTPUT SWITCHING

FREQUENCY vs. LOAD CURRENT

550

500 VIN = 24V

450

PWM MODE

400

350

300

250

200

150

100 ULTRASONIC MODE

50

PFM MODE

0

0.001

0.01

0.1

1

10

LOAD CURRENT (A)

MAX8732A

OUT5 VOLTAGE REGULATION

vs. LOAD CURRENT

5.19

ULTRASONIC

5.17

5.15

5.13

IDLE MODE

5.11

5.09

FORCED-PWM

5.07

5.05

0.001

0.01

0.1

1

10

LOAD CURRENT (A)

MAX8732A

OUT3 VOLTAGE REGULATION

vs. LOAD CURRENT

3.41

3.40

ULTRASONIC

3.39

3.38

3.37

IDLE MODE

3.36 FORCED-PWM

3.35

3.34

3.33

0.001

0.01

0.1

1

10

LOAD CURRENT (A)

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