MAX879CSA Ver la hoja de datos (PDF) - Maxim Integrated

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MAX879CSA

5V/3.3V/3V/Adjustable-Output, Step-Up/Step-Down DC-DC Converters

Maxim Integrated 

5V/3.3V/3V/Adjustable-Output,

Step-Up/Step-Down DC-DC Converters

____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 4, TA = +25°C, unless otherwise noted.)

SWITCHING WAVEFORMS—

CONTINUOUS CONDUCTION

SWITCHING WAVEFORMS—

DISCONTINUOUS CONDUCTION

STEP-DOWN CONVERSION

A

A

A

5µs/div

A: SWITCH VOLTAGE (LX PIN), 2V/div

B: INDUCTOR CURRENT, 0.5A/div

C: OUTPUT VOLTAGE RIPPLE, 50mV/div

MAX877, VIN = 1.5V, IOUT = 100mA

B

0mA

C

2µs/div

A: SWITCH VOLTAGE (LX PIN), 2V/div

B: INDUCTOR CURRENT, 0.5A/div

C: OUTPUT VOLTAGE RIPPLE, 50mV/div

MAX877, VIN = 3V, IOUT = 70mA

B

B

0mA

0mA

C

C

5µs/div

A: SWITCH VOLTAGE (LX PIN), 2V/div

B: INDUCTOR CURRENT, 0.5A/div

C: OUTPUT VOLTAGE RIPPLE, 50mV/div

MAX878, VIN = 6.0V, VOUT = 5.0V, IOUT = 210mA

STEP-UP/STEP-DOWN

OPERATION

A

GND

MAX878

START-UP TIME

A

GND

20ms/div

A: INPUT VOLTAGE, 2V/div, 2V to 6V

B: OUTPUT VOLTAGE, 50mV/div

MAX878, IOUT = 100mA, VOUT = 3.3V

B

B

GND

A: SHDN, 2V/div

B: VOUT, 1V/div

VOUT = 3V

10ms/div

_______________________________________________________________________________________ 5

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