CAT6243DCADJ-RKG datasheet(2/15 Pages) ONSEMI

2 / 15 page

CAT6243

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Figure 1. Application Schematic

VIN

ENABLE

CAT6243

ADJ

BYP

VOUT

GND

VIN

VOUT

(Optional)

CBYP

CIN

2.2

COUT

Figure 2. Simplified Block Diagram

ADJ

GND

2.5 M

VIN

BYP

VOUT

Enable

Logic

Thermal

Shutdown

ISENSE

VREF

−

Table 1. PIN FUNCTION DESCRIPTION

Pin #

WDFN−6

Pin #

DPAK−5−5

Pin Name

Description

The Enable Input. An active HIGH input, turning ON the LDO. This input should be tied to

VIN if the LDO is not intended to be shut off during normal operation. A pull−down 2.5 MW

resistor maintains the circuit in the OFF state if the pin is left open.

2, PAD

3, TAB

GND

Power Supply Ground; Device Substrate. The center pad is internally connected to Ground

and as such can cause short circuits to signal traces running beneath the IC. This pad is

intended for heat sinking the IC to the PCB and is typically connected to the PCB ground

plane.

BYP

Bypass input. Placing a capacitor of 100 pF to 470 pF between BYP and ground reduces

noise on VOUT. This capacitor is optional and it increases the turn−on time.

VOUT

Regulated Output Voltage. A protection block eliminates any current flow from output to

input if VOUT > VIN.

ADJ

Output Voltage Adjust Input. This input ties to the common point of a resistor divider which

determines the regulator’s output voltage. See Applications section for details on selecting

resistor values.

VIN

Positive Power Supply Input. Supplies power for VOUT as well as the regulator’s internal

circuitry.

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