MCP1799 datasheet(12/25 Pages) MICROCHIP

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 2019 Microchip Technology Inc.

DS20006248A-page 12

MCP1799

4.0

DETAILED DESCRIPTION

4.1

Device Overview

The MCP1799 is an AEC-Q100 qualified LDO, capable

of delivering 80 mA of current, over the entire operating

temperature range. The part is stable with a minimum

1 µF output ceramic capacitor, has current limit

protection and extended working temperature range:

-40° to +150°. The device also features a PSRR of

70 dB typical for 100 Hz frequency.

FIGURE 4-1:

Simplified Functional Block Diagram.

4.2

Output Capacitance Requirements

The MCP1799 requires a minimum output capacitance

of 1 µF for output voltage stability. The output capacitor

should be located as close to the LDO output as it is

practical. The device is designed to work with low ESR

ceramic capacitors. Ceramic materials X8R\L or X7R

have low temperature coefficients and are well within

the acceptable ESR range required. A typical 1 µF X7R

0805 capacitor has an ESR of 50 m

. It is

recommended to use an appropriate voltage rating

capacitor, and the derating of the capacitance as a

function of voltage and temperature needs to be taken

into account. For improved transitory behavior over the

entire temperature range, a 2.2 µF output capacitor is

recommended. The ceramic capacitor type should be

X7R or X8R/L because their dielectrics are rated for use

with temperatures between -40°C to +125° or -55°C to

+150°C, respectively.

4.3

Input Capacitance Requirements

Low input-source impedance is necessary for the LDO

output to operate properly. When operating from

batteries, or in applications with long lead length

(>10 inches) between the input source and the LDO,

adding input capacitance is recommended. A minimum

of 1 µF to 10 µF of capacitance is sufficient for most

applications. Given the high input voltage capability of

the MCP1799, of up to 45V DC, it is recommended to

use an appropriate voltage rating capacitor, and the de-

rating of the capacitance as a function of voltage and

temperature needs to be taken into account. The

ceramic capacitor type should be X7R or X8R\L

because their dielectrics are rated for use with

temperatures between -40°C to +125°C or -55°C to

+150°C, respectively.

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