+

EN

GND

IN

OUT

V

IN

C

OUT

R

L

ESR

ToLoad

0.1

0

200

400

600

800

1000

10

1

0.01

RegionofInstability

RegionofStability

RegionofInstability

V

=3.3V

C

=4.7 F

V =4.3V

T =+125 C

OUT

OUT

IN

A

m

°

I

OutputCurrent

mA

OUT

-

-

0.1

0

200

400

600

800

1000

10

1

0.01

RegionofStability

RegionofInstability

RegionofInstability

V

=3.3V

C

=4.7 F

V =4.3V

T =+25 C

OUT

OUT

IN

A

m

°

I

OutputCurrent

mA

OUT

-

-

0.1

0

200

400

600

800

1000

10

1

0.01

RegionofInstability

RegionofStability

RegionofInstability

V

=3.3V

C

=22 F

V =4.3V

T =+25 C

OUT

OUT

IN

A

m

°

I

OutputCurrent

mA

OUT

-

-

0.1

0

200

400

600

800

1000

10

1

0.01

RegionofStability

RegionofInstability

RegionofInstability

V

=3.3V

C

=22 F

V =4.3V

T =+125 C

OUT

OUT

IN

A

m

°

I

OutputCurrent

mA

OUT

-

-

TPS767D3xx

www.ti.com......................................................................................................................................................... SLVS209H – JULY 1999 – REVISED AUGUST 2008

Figure 20. Test Circuit for Typical Regions of Stability (Figure 21 through Figure 24)

(Fixed Output Options)

Equivalent series resistance (ESR) refers to the total series resistance, including the ESR of the capacitor, any

resistance added externally, and PWB trace resistance to COUT.

TYPICAL REGION OF STABILITY

TYPICAL REGION OF STABILITY

ESR vs OUTPUT CURRENT

ESR vs OUTPUT CURRENT

Figure 21.

Figure 22.

TYPICAL REGION OF STABILITY

TYPICAL REGION OF STABILITY

ESR vs OUTPUT CURRENT

ESR vs OUTPUT CURRENT

Figure 23.

Figure 24.

Copyright © 1999–2008, Texas Instruments Incorporated

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