CX8508 Ver la hoja de datos (PDF) - Unspecified

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CX8508

Monolithic Synchronous Buck Regulator / 2A Output Current

Unspecified 

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APPLICATION

25

CX8508

2A22AA

PIN FUNCTIONS

Pin #

1

2

3

Name

BS

IN

SW

Description

High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel

MOSFET switch. Connect a 0.01 μF or greater capacitor from SW to BS to power the high

side switch.

Power Input. IN supplies the power to the IC, as well as the step-down converter

switches. Drive IN with a 4.75V to 25V power source. Bypass IN to GND with a suitably

large capacitor to eliminate noise on the input to the IC. See Input Capacitor.

Power Switching Output. SW is the switching node that supplies power to the output.

Connect the output LC filter from SW to the output load. Note that a capacitor is required

from SW to BS to power the high-side switch.

4

GND Ground.

Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a

resistive voltage divider from the output voltage. The feedback threshold is 0.925V. See

5

FB Setting the Output Voltage.

Compensation Node. COMP is used to compensate the regulation control loop.

Connect a series RC network from COMP to GND to compensate the regulation control

6

COMP loop. In some cases, an additional capacitor from COMP to GND is required. See

Compensation Components.

Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to

7

EN turn on the regulator, drive it low to turn it off. Pull up with 100kΩ resistor for automatic

Stoftt-Start Control Input. SS controls the soft-start period. Connect a capacitor from SS to

8

SS GND to set the soft-start period. A 0.1μF capacitor sets the soft-start period to 15ms. To

disable the soft-start feature, leave SS unconnected.

3

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