CAT6243DCADJ-RKG datasheet(10/15 Pages) ONSEMI

10 / 15 page

CAT6243

www.onsemi.com

PIN FUNCTIONS

VIN

Positive Power Input. Power is supplied to the device

through the VIN pin. A bypass capacitor is required on this

pin if the device is more than six inches away from the main

input filter capacitor. In general it is advisable to include a

small bypass capacitor adjacent to the regulator. In

battery−powered circuits this is particularly important

because the output impedance of a battery rises with

frequency, so a bypass capacitor in the range of 1

mF to 10 mF

is recommended.

GND

Ground. The negative voltage of the input power source.

The center pad on the back of the package is also electrically

ground. This pad is used for cooling the device by making

connection to the buried ground plane through solder filled

vias or by contact with a topside copper surface exposed to

free flowing air.

ENABLE

ENABLE is an active high logic input which controls the

regulator’s the output state. If ENABLE < 0.4 V the

regulator is shutdown and VOUT = 0 V. If ENABLE > 1.6 V

the regulator is active and supplying power to the load.

If the regulator is intended to operate continuously and

won’t be shut down from time to time ENABLE should be

tied to VIN.

BYP

The Bypass Capacitor input is used to decrease output

voltage noise by placing a capacitor between BYP and

ground. The recommended range of capacitance is from

100 pF to 470 pF. Values larger than this will provide no

additional improvement and will further extend CAT6243’s

startup time.

A bypass capacitor is not required for operation and BYP

may be left open or floating if no capacitor is used but DO

NOT ground BYP as this will interfere with the error

amplifier’s functioning.

ADJ

ADJ = Adjust and is the voltage control input. ADJ

connects to the center point of a resistor divider which

determines the CAT6243’s output voltage. See Applications

Section for resistor selection guidelines.

VOUT

VOUT is the regulator’s output and supplies power to the

load. VOUT can be shut off via the ENABLE input. All

CAT6243 members are designed to block reverse current,

meaning anytime VOUT becomes greater than VIN the pass

FET will be shut off so there is no reverse current flow from

output to input. CAT6243 is also equipped with an output

discharge transistor that is turned ON anytime ENABLE is

at a logic Low. This transistor ensures VOUT discharges to

0 V when the regulator is shutdown. This is especially

important when powering digital circuitry because if VOUT

fails to reach 0 V their POR (power−ON reset) circuitry may

not trigger and scrambled data or unpredictable operations

may result.

A minimum output capacitor of 2.2

mF should be placed

between VOUT and GND to insure stable operation.

Increasing the size of COUT, up to 22

mF, will improve

transient response to large changes in load current.

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