SPX4041AM/TR SIPEX [Sipex Corporation], SPX4041AM/TR Datasheet - Page 4

• Manufacturer Part Number: SPX4041AM/TR
• Description: Precision 1.24V Shunt Voltage Reference
• Manufacturer: SIPEX [Sipex Corporation]

This device is designed for stable opera-
tion and has no need of an external
capacitor. The reference remains stable if
a bypass capacitor is used.
SOT-23
The SPX4041 in the SOT-23 package has
a parasitic Schottky diode between pin 3
and pin 1. Pin 1 of SOT-23 must float or
be connected to pin 3.
Conventional Shunt Regulator
In a conventional shunt regulator applica-
tion (see Figure 11), an external series
resister (R
supply voltage and the SPX4041. R
determines the current that flows through
the load (I
Date: 11/29/04
Figure 9. Frequency=100kHz, I
Figure 11. SPX4041 Fixed Shunt Regulator
SPX4041
L
S
) and the reference (I
) is connected between the
R
V
S
R
V
S
I
Q
+ I
K
I
=10mA, T
Q
L
I
L
SPX4041 Precision 1.24V Shunt Voltage Reference
Q
). Since
A
S
V
=25°C
OUT
TYPICAL PERFORMANCE CHARACTERISTICS
4
Figure 10. Test Circuit for Pulse Response
load current and supply voltage may vary,
R
least the minimum acceptable I
reference even when the supply voltage is
at its minimum and the load current is at
its maximum value. When the supply
voltage is at its maximum and I
minimum, R
that the current flowing through the
SPX4041 is less than 15mA.
R
(V
I
(V
Figure 12 1.24V Reference Circuit
Q
f
S
S
), reference’s reverse breakdown voltage
p
S
R
= 100kHz
should be small enough to supply at
is determined by the supply voltage
), the load and operating current (I
).
R
S
APPLICATION INFORMATION
V
S
= (V
IN
should be large enough so
S
- V
R
50Ω
)/(I
© Copyright 2004 Sipex Corporation
V
3k
L
+I
IN
SPX4041
180Ω
Q
)
V
OUT
L
Q
is at its
to the
L
and
I
K
V
GND
OUT