MAX668 Просмотр технического описания (PDF) - Maxim Integrated

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MAX668

1.8V to 28V Input, PWM Step-Up Controllers in µMAX

Maxim Integrated 

1.8V to 28V Input, PWM Step-Up

Controllers in µMAX

Typical Operating Characteristics (continued)

(Circuits of Figures 2, 3, 4, and 5; TA = +25°C; unless otherwise noted.)

EXITING SHUTDOWN

ENTERING SHUTDOWN

0V

OUTPUT

VOLTAGE

5V/div

INDUCTOR

CURRENT

0A

2A/div

SHUTDOWN

VOLTAGE

5V/div

0V

500µs/div

MAX668, VIN = 5V, VOUT = 12V, LOAD = 1.0A, ROSC = 100kΩ,

LOW VOLTAGE, NON-BOOTSTRAPPED

HEAVY-LOAD SWITCHING WAVEFORM

VOUT

200mV/div

AC-COUPLED

Q1, DRAIN

5V/div

0V

IL

1A/div

0A

1µs/div

MAX668, VIN = 5V, VOUT = 12V, ILOAD = 1.0A,

LOW VOLTAGE, NON-BOOTSTRAPPED

LOAD-TRANSIENT RESPONSE

OUTPUT

VOLTAGE

AC-COUPLED

100mV/div

SHUTDOWN

VOLTAGE

0V

5V/div

OUTPUT

0V

VOLTAGE

5V/div

200µs/div

MAX668, VIN = 5V, VOUT = 12V, LOAD = 1.0A,

LOW VOLTAGE, NON-BOOTSTRAPPED

LIGHT-LOAD SWITCHING WAVEFORM

VOUT

100mV/div

AC-COUPLED

Q1, DRAIN

5V/div

0V

IL

0A

1A/div

1µs/div

MAX668, VIN = 5V, VOUT = 12V, ILOAD = 0.1A,

LOW VOLTAGE, NON-BOOTSTRAPPED

LINE-TRANSIENT RESPONSE

OUTPUT

VOLTAGE

100mV/div

AC-COUPLED

LOAD

CURRENT

1A/div

1ms/div

MAX668, VIN = 5V, VOUT = 12V, ILOAD = 0.1A TO 1.0A,

LOW VOLTAGE, NON-BOOTSTRAPPED

INPUT

VOLTAGE

5V/div

0V

20ms/div

MAX668, VIN = 5V TO 8V, VOUT = 12V, LOAD = 1.0A,

HIGH VOLTAGE, NON-BOOTSTRAPPED

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