CMPWR150TO datasheet(6/8 Pages) CALMIRCO

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215 Topaz Street, Milpitas, California 95035

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CMPWR150

CALIFORNIA MICRO DEVICES

CC Power-up (VAUX =3.3V). Figure 6 shows the output

response as V

CC approaches the select threshold during a

power-up when V

AUX is present (3.3V). The output capacitor

is already fully charged. When V

CC reaches the select threshold,

the in-rush current is minimal and the V

CC disturbance is only

130mV. The built-in hysteresis of 250mV ensures the regulator

remains enabled throughout the transient.

OUT offset = 3.3V, VCC offset = 4.3V

CC Power-up (VAUX =3.0V). Figure 7 shows the output

response as V

CC approaches the select threshold during

power-up. The auxiliary voltage, V

AUX is set to a low level

of 3.0V. When V

CC reaches the select threshold, a modest

level of in-rush current is required to further charge the

output capacitor resulting in V

CC disturbance of 200mV.

The built-in hysteresis of 250mV ensures the regulator

remains enabled throughout the transient.

OUT offset = 3.3V, VCC offset = 4.3V

Typical Transient Characteristics (continued)

Figure 6. V

CC Power-up (VAUX =3.3V).

CC Power-down (VAUX = 3.3V).

Figure 8 shows the

output response as V

CC approaches the deselect threshold

during a power-down transition. V

AUX of 3.3V remains

present. When V

CC reaches the deselect threshold (4.1V),

the regulator turns off. This causes a step change reduction

in V

CC current resulting in a small voltage increase at the

CC input. This disturbance is approximately 100mV and

the built-in hysteresis of 250mV ensures the regulator

remains disabled throughout the transient. The output

voltage experiences a disturbance of approximately 100mV

during the transition.

OUT offset = 3.3V, VCC offset = 4.3V

Figure 7. V

CC Power-up (VAUX =3.0V).

Figure 8. V

CC Power-down (VAUX = 3.3V).

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