MAX748ACWE Просмотр технического описания (PDF) - Maxim Integrated

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MAX748ACWE

3.3V, Step-Down, Current-Mode PWM DC-DC Converters

Maxim Integrated 

3.3V, Step-Down,

Current-Mode PWM DC-DC Converters

_________________________________Typical Operating Characteristics (continued)

(Circuit of Figure 3, TA = +25°C, VOUT = 3.3V, unless otherwise noted.)

SWITCHING WAVEFORMS,

CONTINUOUS CONDUCTION

6V

A

0V

400mA

B

0mA

C

SWITCHING WAVEFORMS,

DISCONTINUOUS CONDUCTION

6V

A

0V

200mA

B

0mA

C

2µs/div

A: SWITCH VOLTAGE (LX PIN), 5V/div, 0V TO +6V

B: INDUCTOR CURRENT, 200mA/div

C: OUTPUT VOLTAGE RIPPLE, 50mV/div

V+ = 6V, IOUT = 250mA

2µs/div

A: SWITCH VOLTAGE (LX PIN), 5V/div, 0V TO +6V

B: INDUCTOR CURRENT, 100mA/div

C: OUTPUT VOLTAGE RIPPLE, 50mV/div

V+ = 6V, IOUT = 75mA

LINE-TRANSIENT RESPONSE

LOAD-TRANSIENT RESPONSE

A

A

10V

7V

B

0V

500mA

B

0mA

5ms/div

A: VOUT, 50mV/div

B: V+, 5V/div, 7.0V TO 10.0V

IOUT = 350mA

5ms/div

A: VOUT, 50mV/div

B: IOUT, 200mA/div, 0mA TO 500mA

V+ = 6V

Note 2: Operation beyond the specifications listed in the Electrical Characteristics may exceed the power dissipation ratings of

the device.

Note 3: Wide temperature range circuit of Figure 5 using Sprague surface-mount capacitors.

Note 4: Standby current includes all external component leakage currents. Capacitor leakage currents dominate at TA = +85°C.

_______________________________________________________________________________________ 5

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