CMPWR150TO Ver la hoja de datos (PDF) - California Micro Devices Corp
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CMPWR150TO Datasheet PDF : 8 Pages
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CALIFORNIA MICRO DEVICES
Typical Transient Characteristics (continued)
VCC Power-up (VAUX =3.3V). Figure 6 shows the output
response as VCC approaches the select threshold during a
power-up when VAUX 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 VCC disturbance is only
130mV. The built-in hysteresis of 250mV ensures the regulator
remains enabled throughout the transient.
VOUT offset = 3.3V, VCC offset = 4.3V
CMPWR150
Figure 6. VCC Power-up (VAUX =3.3V).
VCC Power-up (VAUX =3.0V). Figure 7 shows the output
response as VCC approaches the select threshold during
power-up. The auxiliary voltage, VAUX 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 VCC disturbance of 200mV.
The built-in hysteresis of 250mV ensures the regulator
remains enabled throughout the transient.
VOUT offset = 3.3V, VCC offset = 4.3V
Figure 7. VCC Power-up (VAUX =3.0V).
VCC Power-down (VAUX = 3.3V). Figure 8 shows the
output response as VCC approaches the deselect threshold
during a power-down transition. VAUX of 3.3V remains
present. When VCC reaches the deselect threshold (4.1V),
the regulator turns off. This causes a step change reduction
in VCC current resulting in a small voltage increase at the
VCC 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.
VOUT offset = 3.3V, VCC offset = 4.3V
Figure 8. VCC Power-down (VAUX = 3.3V).
©1999 California Micro Devices Corp. All rights reserved.
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215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
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