CMPWR150 datasheet(9/15 Pages) ONSEMI

9 / 15 page

CMPWR150

Rev. 3 | Page 9 of 15 | www.onsemi.com

Figure 6. Transient Characteristics Test Set-up

CC Power-up (VAUX = 3.3V).

Figure 7 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 VCC

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,

CC offset = 4.3V

PowerUpVaux33v.bmp

Figure 7. V

CC Power-up (VAUX = 3.3V)

CC Power-up (VAUX =3.0V).

Figure 8 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 VCC 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.

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