MAX669 datasheet(7/18 Pages) MAXIM

7 / 18 page

1.8V to 28V Input, PWM Step-Up

Controllers in µMAX

_______________________________________________________________________________________

EXITING SHUTDOWN

OUTPUT

VOLTAGE

5V/div

INDUCTOR

CURRENT

2A/div

SHUTDOWN

VOLTAGE

5V/div

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

LOW VOLTAGE, NON-BOOTSTRAPPED

500

µs/div

ENTERING SHUTDOWN

OUTPUT

VOLTAGE

5V/div

SHUTDOWN

VOLTAGE

5V/div

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

LOW VOLTAGE, NON-BOOTSTRAPPED

200

µs/div

HEAVY-LOAD SWITCHING WAVEFORM

VOUT

200mV/div

AC-COUPLED

1A/div

Q1, DRAIN

5V/div

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

LOW VOLTAGE, NON-BOOTSTRAPPED

µs/div

LOAD-TRANSIENT RESPONSE

OUTPUT

VOLTAGE

AC-COUPLED

100mV/div

LOAD

CURRENT

1A/div

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

LOW VOLTAGE, NON-BOOTSTRAPPED

1ms/div

LIGHT-LOAD SWITCHING WAVEFORM

VOUT

100mV/div

AC-COUPLED

1A/div

Q1, DRAIN

5V/div

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

LOW VOLTAGE, NON-BOOTSTRAPPED

µs/div

Typical Operating Characteristics (continued)

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

LINE-TRANSIENT RESPONSE

INPUT

VOLTAGE

5V/div

OUTPUT

VOLTAGE

100mV/div

AC-COUPLED

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

HIGH VOLTAGE, NON-BOOTSTRAPPED

20ms/div

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