JUNE 1993
DS2427 - 1.0
REF50Z/REF50D
5V MICROPOWER PRECISION REFERENCE
The REF50Z and REF50D are integrated circuits using
the bandgap principle to provide a precise stable reference
voltage of 5V. There are two package options available:
REF50Z in a plastic 3-pin TO-92 and REF50D in a miniature
surface mount package (MP8).
These references feature a recommended operating cur-
rent of 60µA to 5mA which make them ideal for all low power
and battery applications.
FEATURES
s
s
s
s
s
s
s
s
s
Low Knee Current - typically 40 microamps
Ideal for Battery Operation - 300 microwatts
Internally Shaped
REF50Z - 3 lead TO-92 Plastic Package
REF50D - Miniature Plastic Surface Mount Package
(MP8)
Tight Initial V
REF
Tolerance
±1.5%
Low Temperature Coefficient
Low Slope Resistance
Operation over Industrial Temperature Range
Fig.1 Pin connection
ORDERING INFORMATION
Device Type
REF50Z
REF50D
Operating Temperature
-40°C to +85°C
-40°C to +85°C
Package
TO-92
MP8
ABSOLUTE MAXIMUM RATINGS
Reference current
5mA
Operating temperature range:
REF50Z
-40 to +85°C
REF50D
-40 to +85°C
Storage temperature
-55 to +125°C
Storage temperature for a max. time of 10ns:
within 1.59mm of seating plane 300°C
within 0.80mm of seating plane 265°C
Fig.2 Internal connections
REF50Z/50D
ELECTRICAL CHARACTERISTICS
Test conditions (unless otherwise stated)
T
amb
= 25°C, I
REF
= 150µA
Value
Characteristics
Symbol
Min.
Typ.
Max.
Units
Conditions
Output voltage
Slope resistance (Note 1)
V
REF
R
REF
4.925
5.00
3.0
3.0
5.075
3.5
3.5
V
Ω
Ω
µA
REF 50Z
REF50D
I
REF
= 150µA
to 5mA
Turn-on (knee) current
Recommended operating
current range
Temperature coefficient
(Note 2)
I
ON
I
REF
0.06
40
5.0
µA
TC V
REF
35
35
110
80
ppm/°C
ppm/°C
µV
µs
µs
µs
µs
REF25Z
Note 2
REF25D
1kHz tp 10kHz
RMS noise voltage
Turn-on time
Turn-off time
Turn-on time
Turn-off time
NOTES
1. Slope resistance (R
REF
)
Slope resistance is defined as
E
N
T
ON
T
OFF
T
ON
T
OFF
13
80
7
65
2
I
REF
= 500µA
R
REF
= Change in V
REF
over a specified current range
The change in reference current
2. Reference voltage temperature coefficient (TC VREF)
This is the normalised reference voltage change over temperature, divided by the change in temperature.
It is expressed in ppm/°C
TC V
REF
=
∆V
REF
X 10
6
V
REF
X
∆T
∆T
= temperature change in
°C
∆V
REF
= change in reference voltage over temperature change
∆T
ppm/°C
2
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