MCP1501 datasheet(6/36 Pages) MICROCHIP

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MCP1501

DS20005474C-page 6

 2015-2016 Microchip Technology Inc.

1.1.6

LOAD REGULATION

An ideal voltage reference will maintain the specified

output voltage regardless of the load's current demand.

However, real devices experience a small error voltage

that deviates from the specified output voltage when a

load is present.

Load regulation is defined as the voltage difference

when under no load (VOUT @ IOUT|0) and under maxi-

mum load (VOUT @ IOUT|MAX), and is expressed as a

percentage, as shown in Equation 1-10.

EQUATION 1-10:

Similar to line regulation, load regulation may also be

expressed as %/mA or in ppm/mA as shown in

Equation 1-11 and Equation 1-12, respectively.

EQUATION 1-11:

EQUATION 1-12:

As an example, if the MCP1501-20 is implemented in a

design and a 10 µV change in output voltage is mea-

sured from a 2 mA change on the input, then the error

in percent, ppm, percent/volt, ppm/volt, as shown in

Equation 1-13 – Equation 1-16.

EQUATION 1-13:

EQUATION 1-14:

EQUATION 1-15:

EQUATION 1-16:

VOUT @ IOUT|0 VOUT @ IOUT|MAX

–

VOUT @ IOUT|MAX

-------------------------------------------------------------------------------------------------------------- 100%



% Load Regulation

V

OUT

V

OUT NOM



---------------------------------------







I

OUT

--------------------------------------------- 100%



-------- Line Regulation

V

OUT

V

OUT NOM



---------------------------------------







I

OUT

--------------------------------------------- 10



ppm

----------- Load Regulation

2.048V 2.04799V

–

2.04799V

----------------------------------------------- 100%



0004882%

2.048V 2.04799V

–

2.04799V

----------------------------------------------- 10

2.048V 2.04799V

–

2.04799V

-----------------------------------------------









4.882 ppm

V

OUT

VOUT NOM



------------------------------------







I

OUT

------------------------------------------

100%



V

2.048V

-----------------





2 mA

-----------------------







100%



0.2441

--------

V

OUT

VOUT MAX



-----------------------------------







I

OUT

-----------------------------------------



V

2.048V

-----------------





2 mA

-----------------------









0.2441

ppm

-----------

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