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CMPWR280TB

1.5A SmartOR™ Dual Regulator with VAUX Drive

California Micro Devices Corp 

CMPWR280

Typical Transient Characteristics

The transient characterization test set-up shown in

Figure 6 includes the effective source impedance of

the VCC supply (RS). This was measured to be approx-

imately 0.1Ω. It is recommended that this effective

source impedance be no greater than 0.15Ω to ensure

precise switching is maintained during VCC selection

and deselection.

Both the rise and fall times during VCC power-up/down

sequencing were controlled at a 10 millisecond dura-

tion. This is considered to represent worst case condi-

tions for most application circuits.

During a selection or deselection transition, the DC

load current is switching from VAUX to VCC and vice

versa. In addition to the normal load current, there may

also be an in-rush current for charging/discharging the

load capacitor.

The total current pulse being applied to either VAUX or

VCC is equal to the sum of the DC load and the corre-

sponding in-rush current. Transient currents in excess

of 1.0 amps can readily occur for brief intervals when

either supply commences to power the load.

VCC Load Transient Response is shown in Figure 7

for a step load from 15mA to 1500mA. An overshoot of

approximately 300mV is observed, before settling

within 3µs.

Figure 7. VCC Load Transient Response

VSBY Load Transient Response is shown in Figure 8

is shown for a step load from 5mA to 375mA. An over-

shoot of approximately 100mV is observed, before set-

tling within 1µs.

Figure 6. Transient Performance Test Set-up

Figure 8. VSBY Load Transient Response

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08/16/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com 7

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