IP1206PBF datasheet(14/30 Pages) IRF

14 / 30 page

2/26/2008

www.irf.com

iP1206PbF

Fig. 13: Ratiometric Power up /down

Output

Voltage

Tracking

and

Sequencing

The iP1206 can accommodate a full spectrum of

user programmable tracking and sequencing

options using Track, Seq, Enable and Power

Good pins.

Through these pins both simple voltage tracking

such as that required by the DDR memory

application and more sophisticated sequencing

such

ratiometric

simultaneously

can

implemented.

The Seq pin controls the internal current sources

to set the power up or down sequencing, toggle

this pin high for power up and toggle this pin low

for power down.

The Track pin is used to determine the second

channel

output

for

either

ratiometric

simultaneously by using two external resistors.

Fig. 12 shows how these pins are configured for

different sequencing mode.

E/A1

VP1

Fb1

SS1/SD1

ISS1 = 28uA

POR

OCP1

Ihiccup1 = 3uA

64uA

Seq

VREF

Vo1

CSS1

Fig.12: Using Seq and Track pin for different sequencing

In general the R

A and RB set the output voltage

for the first output and R

C and RD set the output

voltage for the second output.

For simultaneously vs. ratiometric, RE and RF

can be selected according to the table below:

Fig. 14: Simultaneously Power Up / down

E/A2

VP2

Fb2

SS2/SD2

ISS2 = 28uA

Track

POR

OCP2

Ihiccup2 = 3uA

64uA

Floating

Vo2

Vo1

VREF

And R

F = RB

And R

F = RD

Set R

E = RA

Set R

E = RC

ratiometric

simultaneously

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