CMPWR280TO datasheet(6/11 Pages) ONSEMI

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CMPWR280

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VCC Supply Current of the device is shown across the

entire VCC range in V.

In the absence of VAUX, the supply current remains fixed

at approximately 0.15 mA until VCC reaches the Select

voltage threshold of 4.35 V. At this point the regulator is

enabled and a supply current of 1.0 mA is conducted.

When VAUX is present, the VCC supply current is less than

mA until VCC exceeds VAUX, at which point VCC then

powers the controller (0.15 mA). When VCC reaches

VSELECT, the regulator is enabled.

Figure 5. VCC Supply Current (No Load)

TYPICAL TRANSIENT CHARACTERISTICS

The transient characterization test set−up shown in

Transient Performance Test Set−up includes the effective

source impedance of the VCC supply (RS). This was

measured to be approximately 0.1

W. It is recommended that

this effective source impedance be no greater than 0.15

W 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 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 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

corresponding 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.

VOUT

VSBY

VCC

GND

VOUT

0.1 mF10 mF

Load

2.2 W

PWR280

VCC

5 V

TR=20ms

TF=20ms

VSBY

5 V

Figure 6. Transient Characterization Test Set−up

−

Drive

−

VAUX

3.3 V

FDN338P

(Si2310DS)

0.1 mF1 mF

0.1 W

−

0.1 W

0.1 mF1 mF

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