CMPWR280TO datasheet(6/10 Pages) CALMIRCO

6 / 10 page

CALIFORNIA MICRO DEVICES

3/00

215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214

Fax: (408) 263-7846

www.calmicro.com

CMPWR280

The transient characterization test setup shown below includes

the effective source impedance of the V

CC supply (RS). This

was measured to be approximately 0.1Ω. It is recommended

that this effective source impedance be no greater than 0.15Ω

to ensure precise switching is maintained during V

CC selection

and deselection.

Both the rise and fall times during V

CC power-up/down

sequencing were controlled to be around 10 milliseconds

duration. This is considered to represent worst case conditions

for most application circuits.

During a selection or deselection transition the DC load current

is switching from V

AUX to VCC and vice versa, or from VSBY to

CC. 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 V

AUX or VCC is

equal to the sum of the dc load and the corresponding in-

rush current. Transient currents in excess of one amp can

readily occur for brief intervals when either supply

commences to power the load.

CC Load Transient Response is shown for a step load

from 15mA to 1500mA. An overshoot of approximately

300mV is observed, before settling within 3us.

Typical Transient Characteristics

CC Load Transient Response

SBY Load Transient Response is shown for a step load from

5mA to 375mA. An overshoot of approximately 100mV is

observed, before settling within 1us.

SBY Load Transient Response

CMPWR280TO Datasheet(PDF) 6 Page - California Micro Devices Corp