MCP2025 datasheet(11/38 Pages) MICROCHIP

Part #	MCP2025

Description	LIN Transceiver with Voltage Regulator

PDF	38 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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 2012-2014 Microchip Technology Inc.

DS20002306B-page 11

MCP2025

Assume that we have a good quality VBAT connection

with RTOT =0.1

 and L = 0.1 mH.

Solving the equation gives CBAT/CREG =1.

If we increase RTOT up to 1

, the result becomes

CBAT/CREG = 1.4. However, if the connection is highly

resistive or highly inductive (poor connection), the

CBAT/CREG ratio greatly increases.

Figure 1-6

shows

the

minimum

recommended

CBAT/CREG ratio as a function of the impedance of the

VBAT connection.

FIGURE 1-6:

Minimum Recommended

CBAT/CREG Ratio

TABLE 1-4:

CBAT/CREG RATIO BY VBAT

CONNECTION TYPE

Connection

Type

RTOT

CBAT/CREG

Ratio

Good

0.1

 0.1 mH

Typical



0.1 mH

1.4

Highly inductive

0.1



1mH

Highly resistive



0.1 mH

0.1

VBAT Line Inductance [mH]

CBAT/CREG Ratio as Function of the VBAT Line

Impedance

RBAT = 10

RBAT = 4

RBAT = 2

RBAT = 1

RBAT = 0.3

RBAT = 0.1

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