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CMPWR160

USB Peripheral Power Management

California Micro Devices Corp 

CALIFORNIA MICRO DEVICES

Typical Transient Characteristics continued

VCC Power down

Figure 8 shows the output response of the regulator

during a complete power down situation under full load

conditions with SD tied to VCC.

Tek Run 25.0kS/s Sample

VCC

VOUT

CMPWR160

Shutdown Transient Response

The transient response of the output voltage to the SD

pin is shown in Figure 9. The graph shows that a rising

edge on the SD pin enables the regulator and a falling

edge disables the regulator.

The rise and fall time for the output voltages are 100µs

and 200µs respectively.

(500mA Load)

1.00V Ch2 1.00V M 2.00ms Ch2 3.50V

Figure 8. VCC Power Down

Tek

25.0kS/s 3 Acqs

SD

2

(500mA Load)

VOUT

POR Response

The transient response of the active low POR pin to VOUT

is shown in Figure 10. When VOUT rises above the

POR threshold voltage (typically 2.9V), the pin is forced

to logic low (0V). The pin remains at logic low for 30ms

then it is forced to logic high (3.3V). If V falls below the

OUT

POR threshold voltage during this 30ms interval POR

will remain logic low. If it falls below the voltage threshold

and then recovers the 30ms time will reset.

When VOUT falls below the POR threshold voltage POR is

immediately forced to logic low.

V is tied to ground to show that the POR circuitry will

CC

work without VCC present.

1.00V Ch2 5.00V M 200µs Ch2

3.0V

Figure 9. Shutdown Transient Response

Tek Run 5.0kS/s Sample

3.1V

VOUT

2

2.7V

POR

1.00V Ch2 200mV M 10.0ms Ch2 2.90V

Figure 10. POR Response

©2000 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corporation.

215 Topaz Street, Milpitas, California 95035  Tel: (408) 263-3214

Fax: (408) 263-7846

www.calmicro.com

12/5/2000

7

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