REF3233AMDBVREP datasheet(10/25 Pages) TI

Part #	REF3233AMDBVREP

Description	4 ppm100 A SOT23-6 SERIES VOLTAGE REFERENCES

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Manufacturer	TI [Texas Instruments]

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V

BANDGAP

Vbe

1

-

+

Vbe

2

-

+

R1

Q

2

N

Q

1 I

REF3212-EP, REF3220-EP, REF3225-EP

REF3230-EP, REF3233-EP, REF3240-EP

SBVS078B

– OCTOBER 2006 – REVISED AUGUST 2011

www.ti.com

THEORY OF OPERATION

The REF32xx is a family of CMOS, precision bandgap voltage references. Figure 3 shows the basic bandgap

topology. Transistors Q1 and Q2 are biased so that the current density of Q1 is greater than that of Q2. The

difference of the two base-emitter voltages (Vbe1 – Vbe2) has a positive temperature coefficient and is forced

across resistor R1. This voltage is amplified and added to the base-emitter voltage of Q2, which has a negative

temperature coefficient. The resulting output voltage is virtually independent of temperature.

Figure 3. Simplified Schematic of Bandgap Reference

10

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Product Folder Link(s): REF3212-EP, REF3220-EP, REF3225-EP REF3230-EP, REF3233-EP, REF3240-EP

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