CMPWR160SA datasheet(6/10 Pages) CALMIRCO

6 / 10 page

CALIFORNIA MICRO DEVICES

12/5/2000

215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214

Fax: (408) 263-7846

www.calmicro.com

CMPWR160

Typical Transient Characteristics

The transient characterization test setup is shown in

Figure 6. It was the setup used for the transient tests

unless specified otherwise.

A maximum rated load current of 6.6

Ω (500mA @ 3.3V)

was used during characterization along with a nominal

CC supply voltage of 5V DC, unless specified otherwise.

The load transient characterization was done by switch-

ing between 6.6 and 660

Ω load resistors. This switched

the load between 500 and 5mA respectively.

For the V

CC power-up and power-down characterizations

CC supply was ramped between 0 and 5V. Both the rise

and fall times for the V

CC power-up/down pulses were

controlled to be 15ms.

In the line transient characterizations the V

CC supply

voltage was controlled to step between 4.5 to 5.5V.

For the POR response characterization V

CC and SD were

tied to ground and the V

OUT voltage was directly driven

between 2.7 and 3.1V. This was done by connecting a

function generator directly to the output of the device.

These voltage values were picked because it drove V

OUT

directly across the typical POR threshold voltage of 2.9V.

CC was tied to ground to show that the POR circuitry will

operate even when the V

CC supply voltage is not present.

The oscilloscope traces show the full bandwidth re-

sponse at the SD, POR, V

CC and VOUT pins depending on

the characterization.

VCC

VOUT

GND

10µF

0.1µF

10µF

(500mA)

6.6

Ω

GND

VCC

GND

POR

VOUT

CMPWR160

POR

Figure 6. Transient Characterization Test Setup

CC power-up Cold Start

Figure 7 shows the output response during an initial V

power up with SD tied to V

CC. When VCC reaches a

particular threshold, the regulator turns on. The un-

charged output capacitor causes maximum inrush

current to flow. At this point the device sees the output

as a short circuit and the device enters a protective

current limiting mode. The output capacitor quickly

charges and V

OUT rises. Once this voltage rises to just

below V

CC the inrush current stops flowing and the output

rises with the input. V

OUT continues to rise with the input

until it reaches 3.3V.

Figure 7. V

CC Power-up Cold Start

280mV

(500mA Load)

VCC

VOUT

M 2.00ms

1.00V

Ch2 1.00V

25.0kS/s

Tek Run

Sample

Ch2

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