MCP1253 datasheet(8/18 Pages) MICROCHIP

8 / 18 page

MCP1252/3

DS21752A-page 8

 2002 Microchip Technology Inc.

3.0

PIN FUNCTIONS

TABLE 3-1:

PIN FUNCTION TABLE

3.1

Open-Drain Power Good Output

(PGOOD)

PGOOD is a high-impedance when the output voltage

is in regulation. A logic-low is asserted when the output

falls 7% (typical) below the nominal value. The PGOOD

output remains low until VOUT is within 3% (typical) of

its nominal value. On start-up, this pin indicates when

the output voltage reaches its final value. PGOOD is

high-impedance when SHDN is low.

3.2

Regulated Output Voltage (VOUT)

Bypass to GND with a filter capacitor.

3.3

Power Supply Input (VIN)

It is recommended that VIN be tied to a ceramic bypass

capacitor.

3.4

Ground (GND)

It is recommended that the ground pin be tied to a

ground plane for best performance.

3.5

Flying Capacitor Negative

Terminal (C-)

The charge pump capacitor (flying capacitor) is used to

transfer charge from the input supply to the regulated

output.

It is recommended that a low ESR (equivalent series

resistance) capacitor be used.

3.6

Flying Capacitor Positive Terminal

(C+)

The charge pump capacitor (flying capacitor) is used to

transfer charge from the input supply to the regulated

output.

Proper orientation is imperative when using a polarized

capacitor.

3.7

Shutdown Input (SHDN)

A logic-low signal applied to SHDN disables the device.

A logic-high signal applied to this pin allows normal

operation.

3.8

Select (SELECT) Input or

Feedback (FB) Input

MCP1252-33X50, MCP1253-33X50:

SELECT: Select Input Pin.

Connect SELECT to VIN for 3.3V fixed output. Connect

SELECT to GND for a 5.0V fixed output.

MCP1252-ADJ, MCP1253-ADJ:

FB: Feedback Pin.

A resistor divider connected to this pin determines the

adjustable VOUT value (1.5V to 5.5V).

No.

Name

Function

PGOOD Open-Drain Power GOOD Output

2VOUT

Regulated Output Voltage

3VIN

Power Supply Input

4GND

Ground Terminal

5C-

Flying Capacitor Negative Terminal

6C+

Flying Capacitor Positive Terminal

SHDN

Shutdown Mode, Active-Low Input

SELECT Output Voltage Select Pin.

(MCP1252-33X50, MCP1253-33X50)

Feedback Input Pin for Adjustable Output

(MCP1252-ADJ, MCP1253-ADJ)

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