MCP1792 datasheet(12/32 Pages) MICROCHIP

12 / 32 page

 2019-2020 Microchip Technology Inc.

DS20006229C-page 12

MCP1792/3

3.0

PIN DESCRIPTION

The descriptions of the pins are listed in Table 3-1.

3.1

Ground Pin (GND)

For optimal noise and Power Supply Rejection Ratio

(PSRR) performance, the GND pin of the LDO should

be tied to an electrically “quiet” circuit ground. This will

ensure the LDO power supply rejection ratio and noise

device performance. The GND pin of the LDO conducts

only ground current and that is why a wide trace is not

required. For applications that have switching or noisy

inputs, tie the GND pin to the return of the output

capacitor. Ground planes help lower the inductance

and, as a result, reduce the effect of fast current tran-

sients.

3.2

Regulated Output Voltage Pin

(VOUT)

The VOUT pin is the regulated output voltage VR of the

LDO. A minimum output capacitance of 2.2 µF is

required for the LDO to ensure the stability in all the typ-

ical applications. The MCP1792/3 is stable with

ceramic capacitors. See Section 4.2 “Output Capaci-

tance Requirements” for output capacitor selection

guidance.

3.3

Input Voltage Supply Pin (VIN)

Connect the input voltage source to VIN. If the input

voltage source is located several inches away from the

LDO, or the input source is a battery, it is recommended

that an input capacitor be used. A typical input

capacitance value of 2.2 µF to 10 µF should be

sufficient for most applications. The type of capacitor

used is ceramic. However, the low ESR characteristics

of the ceramic capacitor will yield better noise and

PSRR performance at high frequency.

3.4

Shutdown Control Input (SHDN)

The SHDN input is used to turn the LDO output voltage

off. When the SHDN input is at a logic high level, the

LDO output voltage is enabled. When the SHDN input

is pulled to a logic low level, the LDO output voltage is

disabled. When the SHDN input is pulled low, the LDO

enters a low-quiescent current shutdown state, where

the typical quiescent current is 2 µA.

TABLE 3-1:

PIN FUNCTION TABLE

SOT 23A-3 SOT 23-5 SOT 223-3

SOT 223-5

Symbol

Description

GND

Ground

VOUT

Regulated Output Voltage VR

VIN

Input Voltage Supply

—

Not connected pins (should either be left floating

or connected to ground)

—3

—

SHDN

Shutdown Control Input. Connect to GND to turn

off the output. Do not leave this pin floating.

——

Tab

Exposed Thermal Pad, connected to GND

MCP1792 Datasheet(PDF) 12 Page - Microchip Technology

MCP1792 Datasheet(HTML) 12 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

Datasheet Download

Link URL