EP5358LUI datasheet(12/16 Pages) ALTERA

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EP5358LUI/EP5358HUI

VIN

VSENSE

VSO

VS2

µF

4.7uF

VOUT

AGND

ENABLE

VFB

VS1

PGND

AVIN

PVIN

Figure 8: EP5358LUI using external divider

The output voltage is selected by the following

formula:

(

)

OUT

Ra must be chosen as 237K

Ω to maintain loop

gain. Then Rb is given as:

Ω

−

142

OUT

VOUT can be programmed over the range of

0.6V to (VIN – 0.25V).

NOTE: Dynamic Voltage Scaling is not allowed

between internal preset voltages and external

divider.

EP5358HUI High VID Range Programming

The EP5358HUI VOUT settings are optimized

for higher nominal voltages such as those

required to power IO, RF, or IC memory. The

preset voltages range from 1.8V to 3.3V.

There are eight (8) preset output voltage

settings.

The EP5358HUI does not have an

external

divider

option.

with

the

EP5358LUI,

the VID

pin settings

can be

changed while the device is enabled.

Table 2 shows the VS0-VS2 pin logic states for

the EP5358HUI and the associated output

voltage

levels.

logic

“1”

indicates

connection to AVIN or to a “high” logic voltage

level.

A logic “0” indicates a connection to

AGND or to a “low” logic voltage level. These

pins can be either hardwired to AVIN or AGND

or alternatively can be driven by standard logic

levels. Logic levels are defined in the electrical

characteristics table.

Any level between the

logic

high and logic low is indeterminate.

These pins must not be left floating.

Table 2: EP5358HUI VID Voltage Select Settings

Custom VID Setting Adjustment

AVIN

PVIN

ENABLE

VSENSE

VOUT

AGND

PGND

5.0pF

10uF

4.7uF

EP5358xUI

VS2

VS1

VSO

Figure 9: EP5358xUI with RC inserted in VSENSE

path to modify VID output voltages.

It is possible to adjust VOUT for a given VID

setting by inserting a parallel RC combination

in the VSENSE path as shown in figure 9. The

capacitor value is 5.0pF to ensure stability.

Note that the value of VOUT can only be

increased from its nominal setting

(VOUTNEW>VOUTOLD):

For EP5358LUI:

kOhms

VOUT

OLD

NEW













−

711

For EP5358HUI:

kOhms

VOUT

OLD

NEW













−

356

VOUTNEW is the desired “new” VOUT.

VS2

VS1

VS0

VOUT

3.3

3.0

2.9

2.6

2.5

2.2

2.1

1.8

www.altera.com/enpirion Page 12

03541

October 11, 2013

Rev F

EP5358LUI датащи(PDF) 12 Page - Altera Corporation

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