©1999 California Micro Devices Corp. All rights reserved.

9/99

215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214

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4

CMPWR150

CALIFORNIA MICRO DEVICES

Typical DC Characteristics

Unless stated otherwise, all DC characteristics were

measured at room temperature with a nominal V

voltage of 5.0 volts and an output capacitance of 10µF.

The external PMOS switch was present and resistive load

conditions were used.

The test data shown here was obtained from engineering

samples. The device was modified to allow the regulator

to function below the dropout threshold for the purpose

of obtaining test data. During normal operation,

production parts will shutdown the regulator below a

4.1V supply.

Dropout Characteristics of the regulator are shown in

Figure 1. At maximum rated load conditions (500mA), a

100mV drop in regulation occurs when the line voltage

collapses below 4.1V. For light load conditions (50mA),

regulation is maintained for line voltages as low as 3.5V.

In normal operation, the regulator is deselected at 4.1V,

which ensures a regulation output droop of less than

100mV is maintained.

Figure 1. Dropout Characteristics.

Load Regulation performance is shown from zero to

maximum rated load in Figure 2. A change in load from

10% to 100% of rated, results in an output voltage change

of less than 75mV. This translates into an effective output

impedance of approximately 0.15Ω.

Ground Current is shown across the entire range of

load conditions in Figure 3. The ground current has

minimal variation across the range of load conditions and

shows only a slight increase at maximum load. This slight

increase at rated load is due to the current limit protection

circuitry becoming active.

Figure 2. Load Regulation.

Figure 3. Ground Current.