SPX4040AM-2.5SLASHTR datasheet(4/9 Pages) SIPEX

4 / 9 page

Date: 1/19/05

SPX4040 Micropower 2.5V Shunt Voltage Reference

Figure 10. Off State Leakage

VOUT

GND

250Ω

50Ω

VIN

fp = 100kHz

Figure 8. Test Circuit for Pulse Response

A =25 °C

K =1 to 15mA

f Frequency (Hz)

100

1.0

0.1

0.01

10K

100K

10M

Figure 9. Dynamic Output Impedance T

A = 25°C,

K = 1 to 15mA

0.01

0.1

100

-50

100

150

TA Ambient Temperature (°C)

VKA = 2.5V

APPLICATION INFORMATION

This device is designed for stable operation and

has no need of an external capacitor between

pins 4 and 8. The reference remains stable if a

bypass capacitor is used.

SOT-23

The SPX4040 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 application

(see Figure 11), an external series resistor (R

S) is

connected between the supply voltage and the

SPX4040. R

S determines the current that flows

through the load (I

L) and the reference (IQ).

Since load current and supply voltage may vary,

S should be small enough to supply at least the

minimum acceptable I

Q to the 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

L is at

its minimum, R

S should be large enough so that

the current flowing through the SPX4040 is less

than 15mA.

S is determined by the supply voltage (VS), the

load and operating current (I

L and IQ), reference's

reverse breakdown voltage (V

R).

S = (VS-VR)/(IL+IQ)

TYPICAL PERFORMANCE CHARACTERISTICS

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