LM828 datasheet(8/15 Pages) TI

Part #	LM828

Description	LM828 Switched Capacitor Voltage Converter

PDF	15 Pages

Scroll/Zoom	100%

Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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8 / 15 page

LM828

SNOS035D – MARCH 2010 – REVISED MAY 2013

www.ti.com

REGULATING VOUT

It is possible to regulate the negative output of the LM828 by use of a low dropout regulator (such as the

LP2980). The whole converter is depicted in Figure 16. This converter can give a regulated output from

−1.8V to

−5.5V by choosing the proper resistor ratio:

Vout = Vref (1 + R1/R2)

(6)

where, Vref = 1.23V

(7)

Note that the following conditions must be satisfied simultaneously for worst case design:

Vin_min >Vout_min +Vdrop_max (LP2980)

(8)

+ Iout_max × Rout_max (LM828)

(9)

Vin_max < Vout_max +Vdrop_min (LP2980)

(10)

+ Iout_min × Rout_min (LM828)

(11)

Figure 16. Combining LM828 with LP2980 to Make a Negative Adjustable Regulator

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LM828 Datasheet(PDF) 8 Page - Texas Instruments