Datasheet MCP1501 (Microchip) - 6

MCP1501
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 maximum load (VOUT @ IOUT|MAX), and is expressed as a
percentage, as shown in Equation 1-10. EQUATION 1-10:
V OUT @ I OUT|0 – V OUT @ I OUT|MAX
---------------------------- 100% = % Load Regulation
V OUT @ I OUT|0
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:
  V OUT 
 ---------
 V OUT  NOM 
%
----------- 100% = --Load Regulation
 I OUT
mA EQUATION 1-16:
  V OUT 
10  V- 
 ---------
  ---- V OUT  NOM 
  2.048V 
6
6
----------- 10 =  ------  10 = 2.441 ppm
--- I OUT
mA
 2 mA 

 EQUATION 1-12:
  V OUT 
 ---------
 V OUT  NOM 
6 ppm
----------- 10 = ---Load Regulation
 I OUT
mA
As an example, if the MCP1501-20 is implemented in a
design and a 10 µV change in output voltage is measured 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:
2.048V
– 2.04799V------------ 100% = . 0004882%
2.04799V EQUATION 1-14:
6
6
2.048V
– 2.04799V2.048V – 2.04799V
------------ 10 =  ------------ 10  = 4.882 ppm
2.04799V
2.04799V EQUATION 1-15:
  V OUT 
10  V  
 ---------
  ---- V OUT  NOM 
  2.048V 
%----------- 100% =  ------  100% = 0.2441 --2
mA
 I OUT
mA



 DS20005474E-page 6  2015-2017 Microchip Technology Inc.