SPX4041ASSLASHTR datasheet(4/9 Pages) SIPEX

4 / 9 page

Date: 11/29/04

SPX4041 Precision 1.24V Shunt Voltage Reference

Figure 9. Frequency=100kHz, I

K=10mA, TA=25°C

Figure 10. Test Circuit for Pulse Response

GND

VOUT

50Ω

fp = 100kHz

180Ω

VIN

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

S) is connected between the

supply voltage and the SPX4041. R

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

SPX4041 is less than 15mA.

S is determined by the supply voltage

S), the load and operating current (IL and

Q), reference’s reverse breakdown voltage

R).

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

Figure 11. SPX4041 Fixed Shunt Regulator

Figure 12 1.24V Reference Circuit

IQ + IL

SPX4041

VOUT

VIN

SPX4041

VOUT

TYPICAL PERFORMANCE CHARACTERISTICS

APPLICATION INFORMATION

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